JPH06128572A - Gasoline composition - Google Patents

Abstract

PURPOSE:To obtain a gasoline compsn. having not only a high research octane number but also a high motor octane number by mixing a specific base hydrocarbon material with a specific compd. CONSTITUTION:A gasoline compsn. is prepd. by mixing a base hyrocarbon material having a research octane number of 88 or higher, pref. 94 or higher. still pref. 98 or higher, with isopropyl ether pref. in an amt. of 1-80vol.%, still pref. 5-50vol.%, based on the compsn.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a gasoline composition, and more particularly to a gasoline composition having a high motor octane number, which is particularly useful as a fuel for automobiles and other internal combustion engines.

[0002]

2. Description of the Related Art A high octane number is desired for gasoline for internal combustion engines, especially for automobile fuel. Conventionally,
Gasoline with a high octane number was produced by blending tetraethyl lead, but its blending is now prohibited due to pollution problems caused by lead.

Generally, adjustments in the petroleum refining process allow
It is known that gasoline with a fairly high octane number can be obtained, and various proposals have been made, but such adjustment has a limit, and further, the basic principle of the adjustment is that the aromatic component is mainly increased. Therefore, similar to the pollution problem caused by lead, there is concern about pollution caused by the release of aromatic compounds into the atmosphere.

Further, in recent years, blending of methyl-t-butyl ether or the like with gasoline has been proposed as an octane number improver that is also effective in reducing exhaust gas pollution. However, although these compounds improve the research-method octane number (RON), which is usually called simply “octane number”, the improvement in the motor-method octane number (MON), which is as important as RON in practice, is not sufficient. There is. Further, these compounds effectively improve RON when blended with a gasoline base material having a low RON, but the octane number (particularly MON) improving effect on a base material having a high RON of 100 or more cannot be said to be sufficient.

The octane numbers of various gasoline materials were reported by ASTM in the 1950s (API
The Research Project 45) is only issued. Although the ASTM report is extremely extensive, accurate, and valuable, it is not possible to know the change in octane number behavior due to the compounding because it is a report of only one measured value for each compound under one compounding condition. Is the actual situation.

[0006]

The object of the present invention is to provide RO
It is to provide a gasoline composition having high MON as well as N. The present inventor has conducted research to provide gasoline that satisfies high RON and MON at the same time, and as a result, R
The inventors have found that the octane number can be effectively improved by including isopropyl ether in a gasoline base material having a high ON, and have completed the present invention.

[0007]

According to the present invention, a RON
A gasoline composition is provided, which has a hydrocarbon of 88 or more as a base material and contains isopropyl ether as an essential component. Hereinafter, the content of the present invention will be described in more detail.

The hydrocarbon having a RON of 88 or more as used in the present invention is JIS K which is used in ordinary gasoline.
A hydrocarbon base material that meets the 2202 automotive gasoline specification is used. Specifically, for example, naphtha fraction, cracked gasoline obtained by catalytic cracking method / hydrocracking method, reformed gasoline obtained by catalytic reforming method, polymerized gasoline obtained by olefin polymerization, carbonization of isobutane, etc. Examples thereof include alkylate, isomerate, de-n-paraffin oil obtained by adding (alkylating) a lower olefin to hydrogen, a fraction of these specific ranges or an aromatic hydrocarbon, or a mixture thereof. it can. The hydrocarbon base material desirably has an RON of 88 or more, preferably 94 or more, and more preferably 98 or more. The RON means a research method octane number measured by JIS K 2280 octane number and cetane number test method.

On the other hand, the gasoline composition of the present invention contains isopropyl ether as an essential component. In the gasoline composition of the present invention, the content of isopropyl ether, which is an essential component, is optional and is not particularly limited, but it is preferably 1 based on the total amount of the composition.
˜80% by volume, more preferably 5 to 50% by volume. If the content is too small, the effect is not sufficient, and if it is too large, the effect is saturated and the calorific value of gasoline is reduced.

In the gasoline composition of the present invention, if necessary, for example, phenol-based or amine-based antioxidants; metal deactivators such as Schiff-type compounds and thioamide-type compounds; organic phosphorus-based compounds and the like. Surface anti-ignition agent; Detergent and dispersant such as succinimide, polyalkylamine, polyetheramine; Deicing agent such as polyhydric alcohol and its ether; Alkali metal or alkaline earth metal salt of organic acid, Sulfuric acid of higher alcohol Used as an auxiliary agent such as ester; antistatic agent such as anionic surfactant, cationic surfactant or amphoteric surfactant; known fuel oil additive such as colorant such as azo dye In this case, they can be used alone or as a mixture. The addition amount of the fuel oil additive is arbitrary, but it is preferable to add it so that the total amount thereof is 0.1% by weight or less based on the total amount of the gasoline composition.

[0011]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. [Comparative Example 1] Commercial premium gasoline RON and M
ON was measured. The results are shown in Table 1.

[Comparative Example 2] Aromatic component 18 was prepared by blending a base material for gasoline produced in a usual gasoline production process.
%, Olefin component 10%, distillation property: 10% distillation temperature 47.5 ° C., 50% distillation temperature 79 ° C., 97% distillation temperature 1
A gasoline base material of RON94.5 having a temperature of 55 ° C. was obtained. Each measurement was performed on the obtained gasoline base material in the same manner as in Comparative Example 1. The results are shown in Table 1.

[Examples 1 and 2] In addition to the base material shown in Comparative Example 1,
Isopropyl ether was mixed in the mixing ratio shown in Table 1,
Each measurement was performed in the same manner as in Comparative Example 1. The results are shown in Table 1.

[Examples 3 to 4] In addition to the base material shown in Comparative Example 2,
Isopropyl ether was mixed in the mixing ratio shown in Table 1,
Each measurement was performed in the same manner as in Comparative Example 1. The results are shown in Table 1.

[Comparative Examples 3 to 6] For comparison, methyl-t-butyl ether was added to the base materials shown in Comparative Examples 1 and 2 at the compounding ratio shown in Table 1, and each measurement was carried out in the same manner as in Comparative Example 1. went. The results are shown in Table 1.

The abbreviations in Table 1 are as follows. B-RON, B-MON: Octane number calculation value (BLEN
DING OCTANENUMBER: API Res
See “EachProject 45, calculated octane number of compounding agent calculated from octane number and compounding ratio” IPE: Isopropyl ether MTBE: Methyl-t-butyl ether

From the results shown in Table 1, it was found that the RON and MON of the gasoline base material having a high RON are remarkably improved by blending the isopropyl ether according to the present invention. In addition, as is clear from Comparative Examples 3 to 6,
MTBE was less effective in improving MON than the present invention.

[0018]

[Table 1] Base material Compounding agent Volume% RON B-RON MON B-MON ───────────────────────────────── Comparative Example 1 No commercial 100.6 88.3 Comparative Example 2 No compound 94.5 85.9 ───────────────────────────────── Example 1 Comparative Example 1 IPE 10 101.1 106 89.5 100 Example 2 Comparative Example 1 IPE 20 101.7 106 90.5 99 Example 3 Comparative Example 2 IPE 10 95.3 103 88.8 115 Example 4 Comparative Example 2 IPE 20 96.4 104 91.9 116 ────────────────────────────────── Comparative Example 3 Comparative Example 1 MTBE 10 102.0 115 89.0 95 Comparative Example 4 Comparative Example Example 1 MTBE 20 103.1 113 89.2 93 Comparative Example 5 Comparative Example 2 MTBE 10 96.6 116 87.6 103 Comparative Example 6 Comparative Example 2 MTBE 20 98.6 115 89.1 102 ─────────────────── ────────── ─────

[0019]

INDUSTRIAL APPLICABILITY The gasoline composition of the present invention contains isopropyl ether without increasing the aromatic component, so that the gasoline octane number (particularly MO) can be improved.
N) can be increased.

Claims (1)

[Claims] 1. A gasoline composition comprising a hydrocarbon having a research octane number of 88 or more as a base material and containing isopropyl ether as an essential component.