JP2017145419A - Unleaded gasoline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide unleaded gasoline capable of maintaining an octane number without increasing greatly a blending amount of a heavy catalytic reformate obtained by de-xylene processing, and excellent in smouldering suppression of an ignition plug and acceleration of a vehicle.SOLUTION: In unleaded gasoline, a light catalytically cracked gasoline base material A shown by item (1) as much as 3-40 vol% to the whole volume of the unleaded gasoline, and a heavy catalytic reformate B shown by item (2) as much as 5-45 vol% to the whole volume of the unleaded gasoline are blended, and items (3) to (14) are satisfied. Items (1) to (14) are described in a specification.SELECTED DRAWING: None

Description

  The present invention relates to unleaded gasoline.

Gasoline is configured by appropriately selecting a plurality of base materials so as to satisfy various fuel standards and blending these base materials in appropriate amounts. The octane number, which is one of the fuel standards, is an important factor from the viewpoint of ensuring drivability. As the base material for adjusting the octane number, generally, base materials such as isomerized gasoline, cracked gasoline, catalytic reformed gasoline, catalytic cracked gasoline, and oxygen-containing compounds are used.
Among these substrates, catalytic reformed gasoline is a high-octane substrate having a high density and rich in aromatic compounds that are high-octane components. In particular, heavy catalytic reformed gasoline obtained by fractionating catalytically reformed gasoline has a high aromatic content.

  The heavy contact reformed gasoline contains mixed xylene. Mixed xylene is a fraction containing o-xylene, m-xylene, p-xylene, and ethylbenzene. Mixed xylene can be obtained by distillation from heavy catalytic reformed gasoline, and is used, for example, as a raw material for petrochemical products.

  Therefore, demixed xylene treatment for heavy catalytic reformed gasoline was used to produce mixed xylene for petrochemical raw materials, while gasoline using heavy catalytic reformed gasoline obtained by this demixed xylene treatment. Development of a base material for is desired.

  For example, Patent Document 1 discloses a technique for producing a base material used for gasoline and a raw material for petrochemical products by hydrorefining a naphtha fraction and heavy hydrocarbons obtained by atmospheric distillation of crude oil. There is disclosed a method for producing a catalytic reformed gasoline, characterized in that a mixed fraction with the obtained refined naphtha fraction is used as a raw material, and this is subjected to catalytic reforming. According to this production method, it is said that it is possible to increase the production of a catalytic reformed gasoline fraction and to increase the production of aromatic hydrocarbons having 6 to 8 carbon atoms including benzene, toluene and xylene.

  On the other hand, from the viewpoint of environmental conservation, the use of biomass-derived oxygen-containing base materials such as ethanol has been studied in order to suppress carbon dioxide emissions. When these oxygen-containing base materials are used as fuel, the plant is made by absorbing carbon dioxide from the atmosphere, so even if it is burned, carbon dioxide emissions into the atmosphere are considered to be low. (For example, refer nonpatent literature 1).

JP 2008-297471 A

ANTONIO F. LOPEZ and three others, Latin American Research, 1990, 20, p. 183-187

  However, when mixed xylene is extracted from heavy catalytic reformed gasoline by dexylene treatment, the content of mixed xylene, which is a component that contributes to high octane number, decreases. descend. In order to secure the octane number of the final product gasoline by using such heavy catalytic reformed gasoline with a low octane number as a base material, a means of increasing the blending amount of the heavy catalytic reformed gasoline than before Can be considered. However, when the blending amount of heavy catalytic reformed gasoline is increased, the proportion of heavy catalytic reformed gasoline in the final product gasoline becomes higher and heavier. When gasoline becomes heavier, the use of such gasoline can reduce startability of the automobile engine and cause smoldering of the spark plug.

Spark plug smoldering refers to a phenomenon that causes a so-called misfire, in which the carbon-like substance produced by incomplete combustion of gasoline accumulates on the glass insulator of the spark plug, increasing the leakage current and preventing the spark from flying. .
As a result, when the smoldering phenomenon of the spark plug occurs, the internal combustion engine (engine) becomes unable to start or even when the phenomenon is light, the increase in unburned hydrocarbons in the exhaust, the acceleration performance, etc. It tends to cause problems such as deterioration.
It is known that smoldering of a spark plug is more likely to occur as the aromatic content in gasoline increases.

  Therefore, it is possible to have a desired octane number without using a heavy contact reformed gasoline after dexylene treatment as a base material in an amount higher than that of the conventional one, and to achieve a vehicle acceleration, a smoldering suppression of a spark plug, etc. Gasoline with the performance of is desired.

Furthermore, as described above, gasoline containing an oxygen-containing base material such as ethanol is considered to emit less carbon dioxide into the atmosphere even if it is burned. However, there is a concern that the lightness of the distillation property will be significantly reduced, and that the driving performance of the automobile will be adversely affected.
For this reason, even when an oxygen-containing base material is blended, a gasoline having a desired octane number and having various performances such as acceleration of a vehicle and suppression of smoldering of a spark plug is desired.

  The present invention has been made in view of the situation as described above, maintaining the octane number without significantly increasing the amount of the base material mixed with the heavy catalytic reformed gasoline obtained by the dexylene treatment, and It is an object of the present invention to provide unleaded gasoline excellent in suppression of smoldering spark plugs and acceleration of a vehicle.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors, as a base material to be blended with gasoline, light catalytic cracking gasoline having a specific composition and properties, and dexylene treatment having a specific composition and properties It has been found that the above problems can be solved by blending the heavy contact reformed gasoline obtained by the above in a specific amount, and the present invention has been completed.

That is, the following embodiments are included in the means for solving the above problems.
<1> The light catalytic cracking gasoline base A shown in (1) below is 3% by volume to 40% by volume with respect to the total capacity of unleaded gasoline, and the heavy catalytic reforming gasoline base B shown in (2) below is used. The unleaded gasoline which mix | blends 5 volume%-45 volume% with respect to the total capacity | capacitance of unleaded gasoline, and satisfy | fills following (3)-(14).

(1) Light catalytic cracking gasoline base material A: 10 vol% distillation temperature is 30 ° C to 45 ° C, 50 vol% distillation temperature is 35 ° C to 50 ° C, 90 vol% distillation temperature is 55 ° C to 75 ° C, The end point is 80 ° C. to 100 ° C., the density at 15 ° C. is 0.650 g / cm ^{3 to} 0.670 g / cm ³ , and the olefin content is 40% to 55% by volume with respect to the total volume of the light catalytic cracking gasoline base A. A light catalytic cracking gasoline base material having a hydrocarbon content of 7 or more carbon atoms of 10% by volume or less based on the total capacity of the light catalytic cracking gasoline base material A.

(2) Heavy contact reformed gasoline base material B: The following base material b1 and the following base material b2 are included, and the blending ratio (b1: b2) of the base material b1 and the base material b2 is 95: Heavy catalytically reformed gasoline substrate in the range of 5-5: 95.
The base material b1 has a 10% by volume distillation temperature of 95 ° C to 115 ° C, a 50% by volume distillation temperature of 100 ° C to 120 ° C, a 90% by volume distillation temperature of 105 ° C to 125 ° C, and an end point of 110 ° C to 130 ° C. The density at 0.8 ° C. and 15 ° C. is 0.840 g / cm ^{3 to} 0.860 g / cm ³ , and the aromatic content of carbon number 7 is 70% to 85% by volume and carbon number 8 with respect to the total capacity of the base material b1. A heavy catalytic reforming gasoline base material having an aromatic content of 10% by volume or less based on the total volume of the base material b1 and an aromatic content of 9 carbon atoms or less based on the total capacity of the base material b1 Yes, the base material b2 has a 10% by volume distillation temperature of 155 to 165 ° C, a 50% by volume distillation temperature of 160 ° C to 170 ° C, a 90% by volume distillation temperature of 165 ° C to 175 ° C, and an end point of 175 to 190 ° C. ° C., a density at 15 ℃ is ^{0.860g / cm 3 ~0.880g / cm 3} , One aromatics having 9 carbon atoms is heavy catalytically reformed gasoline base material of more than 90% by volume based on the total volume of the substrate b2.

(3) The research octane number is 89 or more and less than 93.
(4) Motor method octane number is 79 or more and less than 84.
(5) The density at 15 ° C. is 0.710 g / cm ^{3 to} 0.783 g / cm ³ .
(6) The 50 vol% distillation temperature is 75 ° C to 105 ° C.
(7) 70 degreeC distillate is 18 volume%-45 volume% with respect to the whole capacity | capacitance of unleaded gasoline.
(8) Reed vapor pressure is 45 kPa to 93 kPa.
(9) The content of benzene is 1% by volume or less.
(10) The sulfur content is 10 mass ppm or less.
(11) The olefin content is 8% by volume to 30% by volume with respect to the total volume of unleaded gasoline.
(12) The aromatic content is 15% to 45% by volume with respect to the total volume of unleaded gasoline.
(13) The aromatic content of 7 carbon atoms is 26% by volume or less with respect to the total aromatic content in unleaded gasoline.
(14) The aromatic content having 8 carbon atoms is 5% by volume or less with respect to the total aromatic content in the unleaded gasoline.

<2> The unleaded gasoline according to <1>, further including the oxygen-containing base material in an amount of 1% by volume to 15% by volume with respect to a total volume of the unleaded gasoline.

  According to the present invention, the heavy contact reformed gasoline obtained by the dexylene treatment maintains the octane number without significantly increasing the amount of the base material, and suppresses smoldering of the spark plug and acceleration of the vehicle. Excellent unleaded gasoline can be provided.

Hereinafter, embodiments for carrying out the present invention will be described in detail.
In addition, in this specification, "-" showing a numerical range represents the range containing the numerical value each described as the upper limit and the minimum. In addition, when only the upper limit value is described in the numerical range represented by “to”, it means that the lower limit value is also the same unit.
In this specification, the ratio or amount of each component in gasoline refers to the ratio of the total of the plurality of substances present in gasoline unless there is a specific indication when there are a plurality of substances corresponding to each component in gasoline. Or it means quantity.
In the present specification, the “aromatic component” of gasoline includes monocyclic or polycyclic aromatic hydrocarbons other than benzene, and these may have heteroatoms in the structure.

《Unleaded gasoline》
The unleaded gasoline of the present invention has at least 3 volumes of light catalytic cracking gasoline base A (hereinafter also referred to simply as “light catalytic cracking gasoline base A”) having the following (1) with respect to the total capacity of unleaded gasoline. % To 40% by volume, and heavy catalytic reformed gasoline base B (hereinafter also referred to simply as “heavy catalytic reformed gasoline base B”) shown in (2) below with respect to the total capacity of unleaded gasoline 5 volume%-45 volume% are mix | blended.

The unleaded gasoline of the present invention has the above-described configuration, and maintains the octane number of the heavy contact reformed gasoline obtained by the dexylene treatment without greatly increasing the blending amount of the base material. Excellent smoldering suppression and vehicle acceleration.
Furthermore, the lead-free gasoline of the present invention is required for driving an automobile because it maintains an octane number even when an oxygen-containing base material is blended, and is excellent in suppression of smoldering of a spark plug and acceleration of a vehicle. While maintaining practical performance, it can be expected to protect the air environment.

(1) Light catalytic cracking gasoline base material A: 10 vol% distillation temperature is 30 ° C to 45 ° C, 50 vol% distillation temperature is 35 ° C to 50 ° C, 90 vol% distillation temperature is 55 ° C to 75 ° C, The end point is 80 ° C. to 100 ° C., the density at 15 ° C. is 0.650 g / cm ^{3 to} 0.670 g / cm ³ , and the olefin content is 40% to 55% by volume with respect to the total volume of the light catalytic cracking gasoline base A. And a light catalytic cracking gasoline base having a hydrocarbon content of 7 or more carbon atoms of 10% by volume or less with respect to the light catalytic cracking gasoline base A.

(2) The heavy contact reformed gasoline base material B includes the following base material b1 and the following base material b2, and the mixing ratio (b1: b2) of the base material b1 and the base material b2 is 95 on a volume basis. : Heavy catalytic reforming gasoline base material in a range of 5 to 5:95.
The base material b1 has a 10% by volume distillation temperature of 95 ° C to 115 ° C, a 50% by volume distillation temperature of 100 ° C to 120 ° C, a 90% by volume distillation temperature of 105 ° C to 125 ° C, and an end point of 110 ° C to 130 ° C. The density at 0.8 ° C. and 15 ° C. is 0.840 g / cm ^{3 to} 0.860 g / cm ³ , and the aromatic content of carbon number 7 is 70% to 85% by volume and carbon number 8 with respect to the total capacity of the base material b1. A heavy catalytic reforming gasoline base material having an aromatic content of 10% by volume or less based on the total volume of the base material b1 and an aromatic content of 9 carbon atoms or less based on the total capacity of the base material b1 Yes, the base material b2 has a 10% by volume distillation temperature of 155 to 165 ° C, a 50% by volume distillation temperature of 160 ° C to 170 ° C, a 90% by volume distillation temperature of 165 ° C to 175 ° C, and an end point of 175 to 190 ° C. ° C., a density at 15 ℃ is ^{0.860g / cm 3 ~0.880g / cm 3} , One aromatics having 9 carbon atoms is heavy catalytically reformed gasoline base material of more than 90% by volume based on the total volume of the substrate b2.

The light catalytic cracking gasoline base material A is a base material made of light catalytic cracking gasoline distilled from a fluid catalytic cracking device, and the heavy catalytic reforming gasoline base material B is catalytic reforming distilled from a catalytic reforming device. A base material made of gasoline. The unleaded gasoline of this invention mix | blends these light catalytic cracking gasoline base materials A and heavy contact reforming gasoline base materials B as an essential base material.
Hereinafter, the unleaded gasoline of the present invention will be described in detail.

  The unleaded gasoline of the present invention preferably includes a light catalytic cracking gasoline base material A distilled from a fluid catalytic cracking device and a heavy catalytic reforming gasoline base material B distilled from a catalytic reforming device. Hereinafter, each component contained in the unleaded gasoline of this invention is demonstrated below.

<Light catalytic cracking gasoline base material A>
The light catalytic cracking gasoline base material A is a base material made of light catalytic cracking gasoline distilled from a fluid catalytic cracking device, and has a specific composition and properties shown in (1) above.

  Light catalytic cracking gasoline is a catalytic cracking gasoline obtained by cracking petroleum fraction (preferably heavy light oil or vacuum gas oil) such as kerosene, light oil or atmospheric residue with a solid acid catalyst by fluid catalytic cracking method. Can be obtained by distillation.

  The fluid catalytic cracking method is a method for producing catalytic cracking gasoline from heavy hydrocarbons, and a publicly known method can be used. Examples of the fluid catalytic cracking method include UOP method, shell two-stage method, flexi cracking method, ultra ortho flow method, texaco method, Gulf method, ultra cat cracking method, RCC method, and HOC method.

  Specifically, the fluid catalytic cracking method is a process in which a flowing catalyst and hydrocarbon oil are brought into contact with each other at a high temperature to obtain gasoline, middle distillate, and the like. The fluid catalytic cracking method can refer to the FCC (Fluid Catalytic Cracking) process described in pages 107 to 110 of HYDROCARBON PROCESSING / NOVEMBER 2000, for example.

  Light catalytic cracking gasoline uses the above-mentioned FCC process, and hydrocarbon oil (hydrocarbon mixture) boiling above the boiling point of gasoline, solid acid catalyst such as zeolite, silica alumina, alumina (so-called catalyst showing solid acidity) And may be obtained by contacting at a high temperature.

In the FCC process on a commercial scale, an FCC catalyst (solid acid catalyst) is usually continuously circulated inside an FCC apparatus consisting of two types of containers, a vertically installed cracking reactor and a catalyst regenerator. , Catalytic cracking. That is, the hot regenerated catalyst coming out of the catalyst regenerator is mixed with the hydrocarbon oil and guided upward in the cracking reactor. As a result, the solid acid catalyst is deactivated by carbon (coke) deposited on the catalyst, separated from the decomposition products, and further sent to the catalyst regenerator after stripping and regenerated. The regenerated catalyst is again fed to the cracking reactor and used.
On the other hand, the decomposition products are separated by distillation into one or more heavy fractions such as dry gas, liquefied petroleum gas (LPG), gasoline fraction, light cycle oil (LCO), heavy cycle oil (HCO) and slurry oil. . These decomposition products may be partly or wholly recycled into the cracking reactor to further proceed with the decomposition reaction.

  In the gasoline of the present invention, among the fractions separated from the product decomposed by the FCC process, a light gasoline fraction obtained by distilling the gasoline fraction may be used as the light catalytic cracking gasoline.

Examples of heavy hydrocarbons (hereinafter also referred to as “raw hydrocarbons”), which are raw materials used to obtain the light catalytic cracking gasoline base A, include hydrocarbon mixtures boiling above the boiling point of gasoline.
In the present specification, the hydrocarbon mixture boiling above the boiling point of gasoline means a light oil fraction obtained by subjecting crude oil to atmospheric pressure or vacuum distillation, an atmospheric distillation residue oil, a vacuum distillation residue oil, etc., and coker gas oil, Solvent dewaxing oil, solvent deasphalting asphalt, tar sand oil, shale oil oil, coal liquefied oil and the like are also included.
Furthermore, the raw material hydrocarbon is known hydrotreating, for example, in the presence of a hydrotreating catalyst such as a Ni—Mo based catalyst, a Co—Mo based catalyst, a Ni—Co—Mo based catalyst, a Ni—W based catalyst, It may be a hydrotreated oil hydrodesulfurized under high temperature and pressure, and the hydrotreated oil may be used as a raw material hydrocarbon oil in the FCC process.

In the FCC apparatus used for the FCC process, the operating conditions of the cracking reactor are as follows: the temperature is 400 ° C. to 600 ° C., preferably 450 ° C. to 550 ° C., and the pressure is normal pressure to 5 kg / cm ³ , preferably normal pressure. a ~3kg / cm ^3, the compounding ratio of the catalyst and the raw material hydrocarbon oil (catalyst / feedstock hydrocarbon oil), by weight, 2 to 20, preferably preferably has 4 to 15.

When the reaction temperature of the cracking reactor is 400 ° C. or higher, the progress of the decomposition reaction of the raw hydrocarbon oil is promoted, and the amount of the decomposed product tends to be improved. Further, when the reaction temperature is 600 ° C. or lower, an appropriate amount of olefin component tends to be obtained, and a desired octane number can be ensured.
When the pressure is 5 kg / cm ³ or less, an increase in the number of moles can be suppressed by the decomposition reaction, and the progress of the decomposition reaction can be prevented from being lowered. In addition, if the mixing ratio of the catalyst and the raw material hydrocarbon oil (catalyst / raw material hydrocarbon oil) is 2 or more, the catalyst concentration in the cracking reactor does not become too low, and the progress of the decomposition of the raw material oil is prevented. Is possible. Moreover, it becomes possible to exhibit the effect of a catalyst effectively as a compounding ratio is 20 or less.

The distillation characteristics of the light catalytic cracking gasoline base material A are 10 vol% distillation temperature (T10) 30 ° C to 45 ° C, 50 vol% distillation temperature (T50) 35 ° C to 50 ° C, 90 vol% distillation temperature. (T90) is 55 ° C to 75 ° C, and the end point (EP) is 80 ° C to 100 ° C.
When the 10% by volume distillation temperature, 50% by volume distillation temperature, 90% by volume distillation temperature, and end point of the light catalytic cracking gasoline base A are within the above ranges, the octane number of the light catalytic cracking gasoline base A is maintained high. Therefore, it is possible to efficiently produce unleaded gasoline having a high octane number. Furthermore, the unleaded gasoline of this invention manufactured using the light catalytic cracking gasoline base material A tends to be excellent in driving performance and engine cleanliness.
From the above viewpoint, the light catalytic cracking gasoline base A preferably has a 10% by volume distillation temperature of 33 ° C to 44 ° C, a 50% by volume distillation temperature of 38 ° C to 50 ° C, and a 90% by volume distillation temperature. 58 ° C to 73 ° C, end point is 85 ° C to 100 ° C, more preferably 10% by volume distillation temperature is 35 ° C to 43 ° C, 50% by volume distillation temperature is 40 ° C to 50 ° C, 90% by volume distillation. The temperature is 60 ° C to 70 ° C, and the end point is 90 ° C to 100 ° C.
In addition, the said distillation property means the value measured based on JISK2254 (1998).

The research octane number of the light catalytic cracking gasoline base A is preferably 92 or more, more preferably 93 or more, and still more preferably 94 or more.
When the research octane number is 92 or more, the blending amount of the heavy contact reformed gasoline base B can be suppressed, so that it becomes easy to prepare a product gasoline that satisfies the standard.
In addition, this research method octane number is the value measured based on JISK2280-1 (2013).

The density of the light catalytic cracking gasoline base A at 15 ° C. is 0.650 g / cm ^{3 to} 0.670 g / cm ³ .
When the density is within the above range, it is possible to suppress lightening of the unleaded gasoline of the present invention.
From the above viewpoint, the density is preferably ^{0.653g / cm 3 ~0.670g / cm 3} , more preferably at ^{0.655g / cm 3 ~0.670g / cm 3} .
In addition, the said density means the value measured based on JISK2249 (2011).

The olefin content of the light catalytic cracking gasoline base A is 40% by volume to 55% by volume, preferably 40% by volume to 53% by volume, more preferably 40%, based on the total volume of the light catalytic cracking gasoline base A. From volume% to 50 volume%.
When the olefin content of the light catalytic cracking gasoline base A is within the above range, the octane number of the light catalytic cracking gasoline base A can be maintained at a high level.
In addition, an olefin content is measured based on Petroleum Institute method JPI-5S-33-90 (gas chromatograph method), and means the total (volume%) of the olefin content which light catalytic cracking gasoline base material A contains.

The hydrocarbon content of 7 or more carbon atoms in the light catalytic cracking gasoline base A is 10% by volume or less with respect to the total capacity of the light catalytic cracking gasoline base A.
When the content of hydrocarbons having 7 or more carbon atoms is 10% by volume or less, the octane number tends to be improved. From the above viewpoint, the hydrocarbon content having 7 or more carbon atoms is preferably 9% by volume or less, more preferably 8% by volume or less.

In the light catalytic cracking gasoline base A, the hydrocarbon content of 5 carbon atoms is preferably 68% by volume or less, more preferably 65% by volume or less, based on the total capacity of the light catalytic cracking gasoline base A. The lower limit is preferably 63% by volume.
Further, the hydrocarbon content of 6 carbon atoms in the light catalytic cracking gasoline base A is preferably 45% by volume or less, more preferably 43% by volume or less, based on the total capacity of the light catalytic cracking gasoline base A. The lower limit is preferably 40% by volume.
From the viewpoint of maintaining the octane number, the light catalytic cracking gasoline base A has a hydrocarbon content of 5 carbon atoms of 68% by volume or less, a hydrocarbon content of 6 carbon atoms of 45% by volume or less, and a hydrocarbon content of 7 or more carbon atoms. Is particularly preferably 10% by volume or less.
In addition, content of the hydrocarbon part of each carbon number means the value measured based on Petroleum Institute method JPI-5S-33-90 (gas chromatograph method).

<Heavy contact reformed gasoline base material B>
The heavy catalytic reformed gasoline base material B is a base material made of heavy catalytic reformed gasoline distilled from a catalytic reformer, and includes a base material b1 and a base material b2 described later, and It has the specific composition and properties shown in 2).

  The heavy catalytic reformed gasoline to be applied to the present invention is a further known degassing with respect to the fraction distilled when the known debenzene treatment is performed on the catalytic reformed oil obtained from the catalytic reformer. The catalytic reformed oil (ie, catalytically reformed gasoline) after the benzene fraction and the xylene fraction have been removed by performing the xylene treatment.

  For contact reforming oil, heavy straight-run naphtha or the like is subjected to contact reforming method (for example, platform forming method, magna forming method, aromaizing method, reniforming method, food reforming method, ultraforming method, power forming method, etc. ) Can be obtained by contact treatment with a catalyst at high temperature and pressure in a steam stream. Various catalysts can be used as the catalyst used in the catalytic reforming reaction, and a platinum / alumina catalyst (for example, a platinum content of 0.2 mass% to 0.8 mass%) is preferably used. be able to. The platinum / alumina catalyst may further contain rhenium, germanium, tin, iridium and the like. Suitable operating conditions for the catalytic reformer will be described later.

  The base material b1 is a fraction in which the aromatic component having 7 carbon atoms is a main component among the fractions distilled when the dexylene treatment is performed, and the base material b2 is an aromatic content having 9 carbon atoms. Is a heavy base reformed gasoline base material B according to the present invention. A mixed base material obtained by mixing the base material b1 and the base material b2 at a predetermined blending ratio.

  For example, the fraction in which the aromatic component having 7 carbon atoms constituting the base material b1 is the main component and the fraction having the aromatic component having 9 carbon atoms in the base material b2 are the main components. The oil is fractionated into a light catalytic reforming oil fraction, a crude benzene fraction and a heavy catalytic reforming oil fraction by distillation, and the obtained heavy catalytic reforming oil fraction is further distilled. Alternatively, it can be obtained by fractionation into an aromatic fraction having 7 carbon atoms, a xylene fraction, and an aromatic fraction having 9 carbon atoms by a technique such as extraction.

  The catalytic reformer is not particularly limited, and may be an apparatus to which any method such as a fixed bed semi-regenerative type, a cyclic type, or a continuous regenerative type is applied.

When the catalytic reformer is a fixed bed semi-regenerative type, the operating conditions of the catalytic reformer are as follows: reaction temperature: 470 ° C. to 540 ° C., reaction pressure: 1 MPa to 3.5 MPa, hydrogen oil ratio: 76 NL / L to 3000 NL / L, LHSV (Liquid Hourly Space Velocity): 1h ^{−1 to} 4h ⁻¹ is preferable.
When the reaction temperature is 470 ° C. or higher, the octane number of the obtained contact-modified oil tends to be improved. When the reaction temperature is 540 ° C. or lower, hydrocracking proceeds to suppress a decrease in liquid yield and to suppress a decrease in catalytic activity due to the formation of coke. When the reaction pressure is 1 MPa or more, the production of coke can be suppressed. When the reaction pressure is 3.5 MPa, it is possible to obtain a catalytic reforming oil having a high octane number without suppressing the dehydrocyclization reaction.

When the catalytic reformer is a continuous regeneration type, the operating conditions of the catalytic reformer are as follows: reaction temperature: 510 ° C. to 530 ° C., reaction pressure: 0.35 MPa to 1 MPa, hydrogen oil ratio: 140 NL / L to 530 NL / L LHSV: 1h ^{−1 to} 4h ⁻¹ is preferable.

  When the reaction temperature is 510 ° C. or higher, it is possible to improve the octane number of the obtained contact-modified oil. On the other hand, when the reaction temperature is 530 ° C. or lower, hydrocracking proceeds to suppress a decrease in liquid yield and to suppress a decrease in catalytic activity due to coke formation.

  When the reaction pressure is 0.35 MPa or more, the production of coke can be suppressed. When the reaction pressure is 1 MPa or less, it is possible to obtain a catalytic reforming oil having a high octane number without suppressing the dehydrocyclization reaction.

  The base material b1 and base material b2 included in the heavy contact reformed gasoline base material B will be described below.

(Substrate b1)
The distillation property of the base material b1 is 10 vol% distillation temperature (T10) of 95 ° C to 115 ° C, 50 vol% distillation temperature (T50) of 100 ° C to 120 ° C, 90 vol% distillation temperature (T90). 105 ° C to 125 ° C, and the end point (EP) is 110 ° C to 130 ° C.
When the 10% by volume distillation temperature, 50% by volume distillation temperature, 90% by volume distillation temperature, and end point of the base material b1 are within the above ranges, the operability is maintained and the harmful components in the exhaust gas are maintained. It is possible to prevent an increase and deterioration of engine cleanliness.
From the above viewpoint, the base material b1 preferably has a 10% by volume distillation temperature of 85 ° C to 125 ° C, a 50% by volume distillation temperature of 90 ° C to 130 ° C, and a 90% by volume distillation temperature of 95 ° C to 135 ° C. More preferably, the 10 vol% distillation temperature is 95 ° C to 105 ° C, the 50 vol% distillation temperature is 100 ° C to 110 ° C, and the 90 vol% distillation temperature is 105 ° C to 115 ° C.
In addition, said distillation property is the value measured based on JISK2254 (1998).

In the heavy catalytic reformed gasoline base material b1, the research octane number is preferably 103 or more. When the research octane number is 103 or more, it becomes possible to suppress the blending amount of the heavy catalytic reformed gasoline B described later, and the adjustment of the product gasoline that satisfies the standard becomes easy.
From the above viewpoint, the research octane number of the heavy catalytic reformed gasoline base material b1 is preferably 104 or more, more preferably 105 or more.
The research octane number means a value measured according to JIS K 2280-1 (2013).

The density of the heavy catalytic reformed gasoline base material b1 at 15 ° C. is 0.840 g / cm ^{3 to} 0.860 g / cm ³ . When the density is within the above range, it is possible to suppress lightening of the unleaded gasoline of the present invention and change in distillation properties.
From the above viewpoint, the density is preferably 0.840 g / cm ^{3 to} 0.850 g / cm ³ , more preferably 0.840 g / cm ^{3 to} 0.845 g / cm ³ .
In addition, this density means the value measured based on JISK2249-4 (2011).

In the base material b1, the aromatic content of carbon number 7 is 70% by volume to 85% by volume with respect to the total capacity of the base material b1, and the aromatic content of carbon number 8 is 10% by volume or less, and The aromatic content of 9 carbon atoms is 5% by volume or less.
In the base material b1, when the aromatic content having 7 carbon atoms, the aromatic content having 8 carbon atoms, and the aromatic content having 9 carbon atoms are within the above ranges, the deterioration of the smolderability is prevented while maintaining the operation performance. In addition, an increase in the amount of deposit in the engine can be prevented, and an increase in harmful components in the exhaust gas can be suppressed.
From the above viewpoint, the aromatic content having 7 carbon atoms is preferably 75% by volume to 85% by volume, more preferably 80% by volume to 85% by volume or less, based on the total volume of the base material b1. Is preferably 5% by volume or less, more preferably 3% by volume or less, and the aromatic content of 9 carbon atoms is preferably 4% by volume or less, more preferably 3% by volume or less.
In addition, the aromatic content of each carbon number means the value measured based on Petroleum Institute method JPI-5S-33-90 (gas chromatograph method).

(Substrate b2)
The distillation property of the base material b2 is 10% by volume distillation temperature (T10) of 155 ° C. to 165 ° C., 50% by volume distillation temperature (T50) of 160 ° C. to 170 ° C., and 90% by volume distillation temperature (T90). The end point (EP) is 175 ° C to 190 ° C.
When the 10% by volume distillation temperature, 50% by volume distillation temperature, 90% by volume distillation temperature and end point are within the above ranges, it is possible to prevent the heavy catalytic reforming gasoline base B from becoming heavy. Become. Therefore, it is possible to prevent an increase in harmful components in exhaust gas and a deterioration in engine cleanliness while maintaining operating performance such as startability of the internal combustion engine and acceleration of the vehicle.
From the above viewpoint, the distillation property of the base material b2 is 10 vol% distillation temperature of 157 ° C to 165 ° C, 50 vol% distillation temperature of 160 ° C to 168 ° C, and 90 vol% distillation temperature of 165 ° C to 173 ° C. The end point is preferably 180 ° C to 190 ° C, the 10 vol% distillation temperature is 160 ° C to 165 ° C, the 50 vol% distillation temperature is 162 ° C to 165 ° C, and the 90 vol% distillation temperature is 165 ° C. It is more preferable that it is -170 degreeC and an end point is 183 degreeC-188 degreeC.
In addition, the said distillation property is the value measured based on JISK2254 (1998).

The density at 15 ° C. of the base material b2 is 0.860 g / cm ^{3 to} 0.880 g / cm ³ .
When the density of the base material b2 is in the above range, it is possible to suppress the lightening of the unleaded gasoline of the present invention and the ring distortion of the distillation property.
From the above viewpoint, the density is preferably ^{0.865g / cm 3 ~0.880g / cm 3} , more preferably at ^{0.870g / cm 3 ~0.880g / cm 3} .
In addition, this density means the value measured based on JISK2249-4 (2011).

In the base material b2, the aromatic content of 9 carbon atoms is 90% by volume or more with respect to the total capacity of the base material b2.
When the aromatic content of carbon number 9 is within the above range, the deterioration of smoldering property is prevented while maintaining the operating performance, the increase in the amount of deposit (sediment) in the engine is prevented, and An increase in harmful components can be suppressed.
From the above viewpoint, the aromatic content of 9 carbon atoms is preferably 91% by volume or more, more preferably 94% by volume or more.
In addition, the aromatic content of each carbon number means the value measured based on Petroleum Institute method JPI-5S-33-90 (gas chromatograph method).

<Gasoline compounding amount and mixing ratio>
In the unleaded gasoline of the present invention, the content of the light catalytic cracking gasoline base A is 3% by volume to 40% by volume, preferably 10% by volume to 40% by volume, more preferably, with respect to the total volume of the unleaded gasoline. 13 volume% to 40 volume%.
The content of the heavy catalytic reformed gasoline base B is 5% to 45% by volume, preferably 20 to 53% by volume, more preferably 23 to 52% by volume with respect to the total volume of unleaded gasoline. is there.
The mixing ratio (b1: b2) of the base material b1 and the base material b2 in the heavy contact reformed gasoline base material B is 95: 5 to 5:95, preferably 90:10 to 10: on a volume basis. 90, more preferably 80:20 to 10:90.

  In the unleaded gasoline of the present invention, the blending amount and blending ratio of the light catalytic cracking gasoline base A and the heavy catalytic reforming gasoline base B are within the above range, so that the operation performance is maintained and the It becomes possible to prevent an increase in harmful components and deterioration of engine cleanliness. Moreover, it becomes possible to prevent the oxidation stability of unleaded gasoline from decreasing.

<Oxygen-containing substrate>
In addition to the light catalytic cracking gasoline base material A and the heavy catalytic reforming gasoline base material B, the unleaded gasoline of the present invention may further contain an oxygen-containing base material. When the unleaded gasoline of this invention contains an oxygen-containing base material, it becomes possible to further improve the octane number of the unleaded gasoline of this invention.

Examples of the oxygen-containing compound applied as the oxygen-containing base material include alcohols such as methanol and ethanol, and ethers or esters that are derivatives from alcohols.
From the viewpoint of reducing carbon dioxide emissions and environmental conservation, the oxygen-containing compound is preferably an alcohol derived from biomass, or an ether or ester that is a derivative from alcohol.

  The oxygen-containing compound is preferably an alcohol having 2 to 5 carbon atoms, an ether having 4 to 8 carbon atoms, or an ester having 4 to 8 carbon atoms, and an alcohol having 2 to 5 carbon atoms or an alcohol having 4 to 8 carbon atoms. It is more preferably an ether, and further preferably an ether having 4 to 8 carbon atoms.

Examples of the alcohol having 2 to 5 carbon atoms include ethanol, propyl alcohol, and butyl alcohol.
Further, ethers and esters which are derivatives from alcohols include, as ethers having 4 to 8 carbon atoms, ethyl isopropyl ether, ethyl tertiary butyl ether (ETBE), ethyl secondary butyl ether (ESBE), diisopropyl ether, An example is Liamyl ethyl ether (TAEE).

  Examples of the ester having 4 to 8 carbon atoms include ethyl acetate and ethyl propionate.

  Among these, from the viewpoint of reduction of carbon dioxide emission and environmental protection, the oxygen-containing compound is preferably ethyl tertiary butyl ether (ETBE).

When the unleaded gasoline of the present invention contains an oxygen-containing compound, the amount of the oxygen-containing compound is preferably 1% by volume to 15% by volume with respect to the total capacity of the unleaded gasoline. When the amount of the oxygen-containing compound is within the above range, there is little concern about the adverse effect on fuel consumption due to the decrease in the calorific value, and the reduction of carbon monoxide (CO), total hydrocarbons (THC), etc. in the exhaust gas is possible. It becomes possible to plan.
From the above viewpoint, the amount of the oxygen-containing compound is preferably 3% by volume to 13% by volume, more preferably 5% by volume to 12% by volume.

  The unleaded gasoline of the present invention includes a substrate other than the light catalytic cracking gasoline base A, the heavy catalytic reformed gasoline base B and the oxygen-containing base (hereinafter also referred to as “other bases”). Also good. Examples of other base materials include the following components (a) to (d).

(A) Desulfurized light naphtha, which is a light fraction of light fractions and heavy fractions, obtained by distilling desulfurized straight naphtha obtained by desulfurizing straight-run naphtha obtained by atmospheric distillation of crude oil. b) alkylates obtained by reacting isobutane and lower olefins (butene, propylene, etc.) in the presence of an acid catalyst (sulfuric acid, hydrogen fluoride, aluminum chloride, etc.) (c) ordinary products such as crude oil and crude oil Obtained by isomerization of C4 fraction (d) linear lower paraffinic hydrocarbons mainly composed of butane and butenes obtained by distillation during pressure distillation, reformed gasoline production or cracked gasoline production Isomerate or isopentane obtained by precision distillation of isomerate

The unleaded gasoline of the present invention may contain a detergent such as polyetheramine, polyalkylamine, polyisobuteneamine, and succinimide.
When the unleaded gasoline of this invention contains a detergent, it is preferable that the addition amount of a detergent is the range of 50 mass ppm-1000 mass ppm with respect to the total mass of unleaded gasoline.
When the addition amount of the cleaning agent is 50 mass ppm or more, it is possible to prevent an increase in intake valve deposit. Moreover, it becomes possible to prevent the increase in a combustion chamber deposit as the addition amount is 1000 mass ppm or less. When the unleaded gasoline of the present invention contains the detergent in the above range, the generation of the combustion chamber deposit is more effectively suppressed in combination with the effect of suppressing the generation of the engine deposit by applying the heavy contact reforming gasoline B. Is possible.
From the above viewpoint, the addition amount of the detergent is preferably 100 ppm by mass to 500 ppm by mass.

The unleaded gasoline of the present invention may further contain various additives as necessary.
Additives include antioxidants such as phenols and amines, metal deactivators such as thioamide compounds, surface ignition inhibitors such as organophosphorus compounds, antifreezing agents such as polyhydric alcohols and ethers, organic acids Anti-corrosive agents such as alkali metal and alkaline earth metal salts, sulfates of higher alcohols, anionic surfactants, cationic surfactants and amphoteric surfactants, and rust inhibitors such as alkenyl succinates And known fuel additives such as colorants such as azo dyes.
An additive can be used individually by 1 type or in combination of 2 or more types.
The addition amount of the fuel additive is arbitrary, and it is usually preferable that the total addition amount of the fuel additive is 0.1% by mass or less with respect to the total mass of the unleaded gasoline.

  There is no restriction | limiting in particular as a manufacturing method of the unleaded gasoline of this invention, It can prepare by a well-known method. As a method for producing unleaded gasoline of the present invention, for example, specific light catalytic cracking gasoline is 3 to 40% by volume with respect to the total capacity of unleaded gasoline, and heavy catalytic reformed gasoline C is to have the total capacity of unleaded gasoline. On the other hand, it may be blended so as to contain 5% by volume to 45% by volume and prepared so as to satisfy the following (3) to (14).

<Properties of unleaded gasoline>
As described above, the unleaded gasoline of the present invention comprises 3 to 40% by volume of the light catalytic reformed gasoline base A shown in (1) with respect to the total volume of unleaded gasoline, and the heavy shown in (2). The catalytic reforming gasoline base B is blended in an amount of 5% to 45% by volume with respect to the total volume of unleaded gasoline, and satisfies (3) to (14).
Hereinafter, each property in the properties of unleaded gasoline will be described.

(3) Research octane number (RON)
The unleaded gasoline of the present invention has a research octane number (RON) of 89 or more and less than 93. When the research octane number is 89 or more, knocking can be suppressed and high driving performance can be maintained.
From the above viewpoint, the research octane number is preferably 90 or more and less than 93.
The research octane number means a value measured according to JIS K 2280-1 (2013).

(4) Motor method octane number (MON)
The unleaded gasoline of the present invention has a motor octane number (MON) of 79 or more and less than 84.
When the motor method octane number is 79 or more, it is possible to prevent a decrease in anti-knock property during high-speed traveling.
From the above viewpoint, the motor method octane number is preferably 80 or more and less than 84.
The motor method octane number means a value measured according to JIS K 2280-2 (2013).

(5) Density The unleaded gasoline of the present invention has a density at 15 ° C. of 0.710 g / cm ^{3 to} 0.783 g / cm ³ .
When the density is 0.710 g / cm ³ or more, it is possible to ensure good fuel efficiency. Moreover, when the density is 0.783 g / cm ³ or less, there is a tendency to reduce the high-density aromatic component, and it becomes possible to reduce the discharge amount of the aromatic compound to the atmosphere by the exhaust gas.
From the above viewpoint, the density is preferably 0.710 g / cm ^{3 to} 0.770 g / cm ³ .
In addition, the said density is the value measured based on JISK2249-4 (2011).

(6) 50 vol% distillation temperature and (7) 70 ° C distillate The unleaded gasoline of the present invention has a 50 vol% distillation temperature (T50) of 75 ° C to 105 ° C.
Moreover, 70 degreeC distillate (E70) is 18 volume%-45 volume% with respect to the whole capacity | capacitance of unleaded gasoline in the unleaded gasoline of this invention.
When the 50% by volume distillation temperature and the 70 ° C. distillation amount are within the above ranges, there is a tendency to prevent problems related to operation performance such as startability and acceleration.
From the above viewpoint, the 50 vol% distillation temperature is preferably 80 ° C to 100 ° C.
From the same viewpoint, the 70 ° C. distillate (E70) is preferably 20% by volume to 45% by volume.
In addition, 50 volume% distillation temperature and 70 degreeC distillation amount are the values measured based on JISK2254 (1998).

(8) Reed vapor pressure (RVP)
The lead vapor pressure (RVP) of the unleaded gasoline of the present invention is 45 kPa to 93 kPa.
When the lead vapor pressure is 45 kPa or more, it is possible to prevent the low-temperature startability and the warm-up property from being deteriorated. Further, when the reed vapor pressure is 93 kPa or less, the amount of evaporating gas can be reduced.
From the above viewpoint, the reed vapor pressure is preferably 50 kPa to 90 kPa.
In addition, this lead vapor pressure means the value measured based on JISK2258-1 (2009).

(9) Content of benzene The unleaded gasoline of the present invention has a benzene content of 1% by volume or less based on the total capacity of the unleaded gasoline. When the benzene content is 1% by volume or less, there is a tendency to suppress an increase in the concentration of benzene in the atmosphere, and environmental pollution can be reduced.
From the above viewpoint, the benzene content is preferably 0.8% by volume or less.
In addition, content of benzene means the sum total (volume%) of content of benzene in unleaded gasoline measured based on Petroleum Institute method JPI-5S-33-90 (gas chromatograph method).

(10) Sulfur content The unleaded gasoline of the present invention has a sulfur content of 10 ppm by mass or less based on the total mass of the unleaded gasoline.
If the sulfur content is 10 ppm by mass or less, there is a tendency to suppress a reduction in the capacity of the exhaust gas purification catalyst, and nitrogen oxide (NOx), carbon monoxide (CO) and total hydrocarbons (THC) in the exhaust gas are reduced. It is possible to suppress an increase in concentration.
From the above viewpoint, the sulfur content is preferably 8 mass ppm or less.
In addition, the said sulfur content is the total (capacity | capacitance) of the sulfur content in unleaded gasoline measured based on JISK2541-6 (2003) "Crude oil and petroleum products-Sulfur content test method 6th part: Ultraviolet fluorescence method". %).

(11) Olefin content In the unleaded gasoline of the present invention, the olefin content is 8% by volume to 30% by volume with respect to the total capacity of the unleaded gasoline.
When the olefin content is 8% by volume to 30% by volume, it is possible to prevent a decrease in oxidation stability. From the above viewpoint, the olefin content is preferably 12% by volume to 28% by volume.
In addition, an olefin content means the sum total (volume%) of the olefin content in unleaded gasoline measured based on Petroleum Institute method JPI-5S-33-90 (gas chromatograph method).

(12) Aromatic content The unleaded gasoline of the present invention has an aromatic content of 15 vol% to 45 vol% with respect to the total capacity of the unleaded gasoline. When the aromatic content is 45% by volume or less, an increase in harmful components contained in the exhaust gas can be prevented.
From the above viewpoint, the aromatic content is preferably 20 to 45% by volume.
In addition, an aromatic content means the sum total (volume%) of the aromatic content in unleaded gasoline measured based on Petroleum Institute method JPI-5S-33-90 (gas chromatograph method).

(13) Aromatic content having 7 carbon atoms In the unleaded gasoline of the present invention, the aromatic content having 7 carbon atoms is 26% by volume or less with respect to the total capacity of the aromatic content in the unleaded gasoline. If the aromatic content of carbon number 7 is 26% by volume or less, production of mixed xylene can be increased.
From the above viewpoint, the aromatic content having 7 carbon atoms is preferably 24% by volume.
The aromatic content of carbon number 7 is the total (capacity of aromatic content of carbon number 7 in unleaded gasoline) measured according to the Japan Petroleum Institute method JPI-5S-33-90 (gas chromatographic method). %).

(14) Aromatic content having 8 carbon atoms In the unleaded gasoline of the present invention, the aromatic content having 8 carbon atoms is 5% by volume or less with respect to the total capacity of the aromatic content in the unleaded gasoline. When the aromatic content of carbon number 8 is 5% by volume or less, production of mixed xylene can be increased.
From the above viewpoint, the aromatic content having 8 carbon atoms is preferably 4% by volume.
The aromatic content of carbon number 8 is the total (capacity of aromatic content of carbon number 8 in unleaded gasoline) measured according to the Petroleum Institute method JPI-5S-33-90 (gas chromatographic method). %).

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

(Example 1 to Example 12, Comparative Example 1 to Comparative Example 6)
Heavy catalytic reformed gasoline base materials (b1 and b2), light catalytic cracked gasoline base materials (A1, A2 and C), and other base materials (desulfurized catalytic cracked gasoline, desulfurized light naphtha, C4) having the properties shown in Table 1 The unleaded gasoline having the properties shown in Tables 3 and 4 was obtained.

The heavy contact reformed gasoline base materials B1 to B5 shown in Table 3 and Table 4 are mixed base materials in which the heavy contact reformed gasoline base materials b1 and b2 shown in Table 1 are blended at the blending ratio shown in Table 2. There is a heavy catalytic reformed gasoline base material included in the heavy catalytic reformed gasoline base material B described above.
The heavy contact reformed gasoline base materials b1 and b2 are base materials included in the base material b1 and the base material b2 described above, respectively.
The light catalytic cracking gasoline base materials A1 and A2 are both base materials included in the heavy catalytic reformed gasoline base material A described above.
The light catalytic cracking gasoline base material C is a base material outside the range of the light catalytic cracking gasoline base material A described above.

The properties of heavy catalytic reformed gasoline base, light catalytic cracked gasoline base, desulfurized catalytic cracked gasoline, desulfurized light naphtha, C4 fraction and unleaded gasoline were measured according to the above test method and measurement method. .
In Tables 1, 3, and 4, “-” indicates that the corresponding component is not included.

In Table 1, the ratios (volume%) of the olefin content and aromatic content are all based on the total capacity of the gasoline base material.
The C5 hydrocarbon content, C6 hydrocarbon content, and C7 or higher hydrocarbon content (volume%) are all based on the total capacity of the gasoline base material.
C6 aromatic content, C7 aromatic content, C8 aromatic content, C9 aromatic content, C10 aromatic content, C11 aromatic content, C12 aromatic content, and C13 aromatic content ratio (volume%) Is based on the total capacity of the gasoline base.

Abbreviations in Table 4 are as follows.
・ ETBE: Ethyl tertiary butyl ether (oxygen-containing base material)

In Tables 3 and 4, the proportions (volume%) of olefin and aromatic are both based on the total volume of gasoline.
The benzene content, C7 aromatic content, C8 aromatic content, and C9 or higher aromatic content (volume%) are all based on the total capacity of the gasoline base.

[Evaluation]
The following evaluation was performed using the unleaded gasoline prepared in Examples 1-12 and Comparative Examples 1-6. The results are shown in Tables 5 and 6.

<Acceleration (driving performance)>
Evaluation of the acceleration performance was performed using a vehicle with a displacement of 2 L, a direct injection (DI) system, and an automatic transmission (AT) under conditions of a test temperature of 20 ° C. and a humidity of 50%.
Idling was performed for 10 seconds after the vehicle engine was started, and the time until the vehicle speed reached 40 km / h at an accelerator opening of 50% was measured.
When the acceleration time was within 4.20 seconds, it was evaluated that the acceleration performance was excellent, and when the acceleration time exceeded 4.20 seconds, it was evaluated that the acceleration performance was inferior.

<Smoldering characteristics of spark plug>
Evaluation of smoldering suppression of the spark plug was performed by the following method. Using a vehicle with a displacement of 2L, a multipoint injection (MPI) system, and an automatic transmission (AT), under the test temperature condition of −10 ° C., after performing an evaluation test of about 30 minutes per cycle shown below, The insulation resistance value was measured using an insulation resistance meter (model number: DM-1526, manufactured by Sanwa Denki Keiki Co., Ltd.).
The engine is started, acceleration / deceleration of 10 km / h to 20 km / h is repeated 10 times, then the engine is turned off and cooled for 28 minutes.
The fluctuation of the insulation resistance value of the spark plug is an indicator of the degree of contamination of the spark plug.
When the insulation resistance value of the spark plug reaches 100 MΩ or less, it is determined that smoldering of the spark plug has occurred. The evaluation test was repeated until it was determined that smoldering of the spark plug occurred, and the smoldering property of the spark plug was evaluated based on the number of tests (number of cycles) until it was determined that smoldering of the spark plug occurred.
A case where the number of cycles is 15 times or more is judged to be excellent in suppressing smoldering of the spark plug.

The unleaded gasolines of Examples 1 to 12 showed good results in both acceleration and spark plug smoldering. On the other hand, the unleaded gasolines of Comparative Examples 1 to 6 that do not satisfy even one of the constituent elements according to the present invention in the blending of the base material or the fuel properties can obtain the driving performance satisfying both the acceleration performance and the smoldering property of the spark plug. I couldn't.
Further, the unleaded gasolines of Examples 7 to 12 were excellent in acceleration and suppression of smoldering of the spark plug even when ETBE, which is an oxygen-containing base material, was included.

  From the above results, it can be seen that the unleaded gasoline of the present invention maintains the octane number, suppresses smoldering of the spark plug, and is excellent in the acceleration performance of the internal combustion engine. In addition, the unleaded gasoline of the present invention including the oxygen-containing base material can contribute to the preservation of the atmospheric environment.

Claims (2)

The light catalytic cracking gasoline base A shown in (1) below is 3 to 40% by volume with respect to the total volume of unleaded gasoline, and the heavy catalytic reforming gasoline base B shown in (2) below is made of unleaded gasoline. Unleaded gasoline which mix | blends 5 volume%-45 volume% with respect to the whole capacity | capacitance, and satisfy | fills following (3)-(14).
(1) Light catalytic cracking gasoline base material A: 10 vol% distillation temperature is 30 ° C to 45 ° C, 50 vol% distillation temperature is 35 ° C to 50 ° C, 90 vol% distillation temperature is 55 ° C to 75 ° C, The end point is 80 ° C. to 100 ° C., the density at 15 ° C. is 0.650 g / cm ^{3 to} 0.670 g / cm ³ , and the olefin content is 40% to 55% by volume with respect to the total volume of the light catalytic cracking gasoline base A. A light catalytic cracking gasoline base material having a hydrocarbon content of 7 or more carbon atoms of 10% by volume or less based on the total capacity of the light catalytic cracking gasoline base material A.
(2) Heavy contact reformed gasoline base material B: The following base material b1 and the following base material b2 are included, and the blending ratio (b1: b2) of the base material b1 and the base material b2 is 95: Heavy catalytically reformed gasoline substrate in the range of 5-5: 95.
The base material b1 has a 10% by volume distillation temperature of 95 ° C to 115 ° C, a 50% by volume distillation temperature of 100 ° C to 120 ° C, a 90% by volume distillation temperature of 105 ° C to 125 ° C, and an end point of 110 ° C to 130 ° C. The density at 0.8 ° C. and 15 ° C. is 0.840 g / cm ^{3 to} 0.860 g / cm ³ , and the aromatic content of carbon number 7 is 70% to 85% by volume and carbon number 8 with respect to the total capacity of the base material b1. A heavy catalytic reforming gasoline base material having an aromatic content of 10% by volume or less based on the total volume of the base material b1 and an aromatic content of 9 carbon atoms or less based on the total capacity of the base material b1 Yes, the base material b2 has a 10% by volume distillation temperature of 155 to 165 ° C, a 50% by volume distillation temperature of 160 ° C to 170 ° C, a 90% by volume distillation temperature of 165 ° C to 175 ° C, and an end point of 175 to 190 ° C. ° C., a density at 15 ℃ is ^{0.860g / cm 3 ~0.880g / cm 3} , One aromatics having 9 carbon atoms is heavy catalytically reformed gasoline base material of more than 90% by volume based on the total volume of the substrate b2.
(3) Research method octane number of 89 or more and less than 93 (4) Motor method octane number of 79 or more and less than 84 (5) Density at 15 ° C. of 0.710 g / cm ^{3 to} 0.783 g / cm ³
(6) 50% by volume distillation temperature is 75 ° C to 105 ° C
(7) Distillation at 70 ° C is 18% to 45% by volume with respect to the total volume of unleaded gasoline.
(8) Reed vapor pressure is 45 kPa to 93 kPa
(9) The content of benzene is 1% by volume or less. (10) The sulfur content is 10 ppm by mass or less. (11) The olefin content is 8% by volume to 30% by volume with respect to the total volume of unleaded gasoline.
(12) The aromatic content is 15% to 45% by volume with respect to the total volume of unleaded gasoline.
(13) The aromatic content of 7 carbon atoms is 26 vol% or less with respect to the total volume of aromatic content in unleaded gasoline (14) The aromatic content of 8 carbon atoms is the total capacity of aromatic content in unleaded gasoline 5% or less by volume   The lead-free gasoline according to claim 1, further comprising an oxygen-containing base material in an amount of 1% by volume to 15% by volume based on the total volume of the unleaded gasoline.