CN104549469A - Reproducible catalyst for converting polycyclic aromatic hydrocarbon into monocyclic aromatic hydrocarbon and preparation method of reproducible catalyst - Google Patents
Reproducible catalyst for converting polycyclic aromatic hydrocarbon into monocyclic aromatic hydrocarbon and preparation method of reproducible catalyst Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a reproducible catalyst for converting polycyclic aromatic hydrocarbon into monocyclic aromatic hydrocarbon and a preparation method of the reproducible catalyst, and is mainly used for solving the problems in the prior art that the conversion depth of the polycyclic aromatic hydrocarbon is low, the yield of the monocyclic aromatic hydrocarbon is low and the reproduction performance of the catalyst is poor. The problems are solved very well by adopting the technical scheme that the catalyst is prepared from the following components in percentage by weight: 30%-65% of a mixture of MOR zeolite and a ZSM-12 molecular sieve, 34.5%-69.9% of at least one adhesive selected from gamma-aluminum oxide, eta-aluminum oxide and pseudo-boehmite, and 0.1%-0.5% of at least one metal selected from Pt, Pd and Ir. The catalyst has the relatively good reproduction performance and can be used for industrial production of converting the heavy polycyclic aromatic hydrocarbon to the monocyclic aromatic hydrocarbon.
Description
Technical field
The present invention relates to the Catalysts and its preparation method that a kind of reproducible polycyclic aromatic hydrocarbon is converted into mononuclear aromatics.
Background technology
Polycyclic aromatic hydrocarbon (Polycyclic Aromatic Hydrocarbons PAHs), be the hydrocarbon containing two and two or more phenyl ring in molecule, comprising naphthalene, anthracene, phenanthrene, pyrene etc. more than 150 and plant compound, is important environment and food contaminant.In oil refining process, the important topic how utilizing the heavy aromatics development of raw materials high value added product containing a large amount of polycyclic aromatic hydrocarbon to become petrochemical industry worker to face.Along with the intensification of oil product degree of heaviness, except small part is as except solvent naphtha, more heavy aromatics raw material is used as fuel oil and uses, but along with the raising of environmental requirement, heavy aromatics market starts atrophy, when heavy aromatics output increases year by year, the new way of seeking heavy aromatics Appropriate application is very urgent.In recent years, by development heavy aromatics deep conversion, the light-end products of volume increase high added value become the significant development strategy of 21 century oil refining industry.
Through development for many years, as the important technology hydrotreatment by heavy aromatic hydrocarbon light, although at present there is the advantages such as adaptability to raw materials is wide, conversion level is large, but also there is reaction temperature and pressure is high, air speed is low, consumption hydrogen is large, catalyst life is short, regenerability is poor etc. weak point, these also become the emphasis that domestic and international research institution breaks through.
US6683020B2 discloses a kind of catalyst of open loop, and this catalyst is made up of a certain proportion of aluminium oxide, aluminosilicate molecular sieves and metal iridium, and open loop activity is higher, has certain anti-coking performance.Open loop temperature scope is at 150 ~ 400 DEG C, and pressure 100 ~ 3000 psig, LHSV are 0.1 ~ 10h
-1.In feed stream, sulfur content can not more than 10ppm, and in logistics except cycloalkane arene content be no more than 20wt%.
US2007062848A1 discloses and a kind ofly first will carry out selective opening and de-alkyl after polycyclic aromatic hydrocarbon fractional saturation again to obtain the method for light aromatics.The method can to meet in feed stream polycyclic aromatic hydrocarbon content at more than 20wt%, saturation stage temperature at 300 ~ 500 DEG C, pressure 2 ~ 10MPa; Open loop phase temperature at 200 ~ 600 DEG C, pressure 1 ~ 12MPa.Because two-stage catalytic agent is contained in same reactor, so require that logistics needs to ensure that certain time of staying could obtain good conversion ratio, therefore air speed is lower.
CN200580009162 discloses a kind of method that polycyclic aromatic hydrocarbon is catalytically conveted to dimethylbenzene, and the catalyst carrier that the method uses is selected from modenite, mazzite, β zeolite, ZSM-11, ZSM-12, ZSM-22, ZSM-23, MFI topology zeolite, NES topology zeolite, EU-1, MAPO-36, MAPSO-31, SAPO-11, SAPO-41 and silica-alumina and their combination.This catalyst can be used for processing the feed stream containing high boiling substance, to a certain degree can also reduce the terminal of the 99.5wt% of feed stream while generating dimethylbenzene.
CN1270989A discloses a kind of containing C
9 +heavy arenes lightening catalyst and product separation method, described catalyst is made up of group VIII metal, the zeolite with MOR structure of 20 ~ 59 heavy %, the zeolite of the MFI structure of 20 ~ 50 heavy % and the aluminium oxide of 20 ~ 40 heavy % of 0.05 ~ 0.3 % by weight.Described method be by heavy arene 350 ~ 450 DEG C, under 0.5 ~ 3.5MPa condition with above-mentioned catalyst exposure, gained lighting product can obtain the Organic Ingredients such as BTX and mesitylene, pseudocumene, durol through fractionation.
Summary of the invention
One of technical problem to be solved by this invention is low in order to overcome the polycyclic aromatic hydrocarbon conversion level existed in prior art, mononuclear aromatics yield is low and selective low, the problem of catalyst regeneration poor performance, provides a kind of catalyst being converted into mononuclear aromatics for polycyclic aromatic hydrocarbon newly.This catalyst is used for the reaction that polycyclic aromatic hydrocarbon is converted into mononuclear aromatics, has polycyclic aromatic hydrocarbon conversion level high, the yield of mononuclear aromatics and selective height, the advantage that catalyst regeneration performance is good.
Two of technical problem to be solved by this invention is to provide the preparation method that a kind of reproducible polycyclic aromatic hydrocarbon corresponding with one of technical solution problem is converted into the catalyst of mononuclear aromatics.
Three of technical problem to be solved by this invention is to provide the purposes that a kind of reproducible polycyclic aromatic hydrocarbon corresponding with one of technical solution problem is converted into the catalyst of mononuclear aromatics.
Four of technical problem to be solved by this invention is to provide the renovation process that a kind of reproducible polycyclic aromatic hydrocarbon corresponding with one of technical solution problem is converted into the catalyst of mononuclear aromatics.
For one of solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of reproducible polycyclic aromatic hydrocarbon is converted into the catalyst of mononuclear aromatics, in catalyst weight percent, comprises following component:
A) mixture of 30 ~ 65% MOR type zeolites and ZSM-12 molecular sieve;
B) 34.5 ~ 69.9% at least one be selected from gama-alumina, η-aluminium oxide or boehmite are binding agent;
C) 0.1 ~ 0.5% at least one metal in Pt, Pd or Ir or its oxide is selected from.
In technique scheme, in used catalyst composition, MOR type zeolite and ZSM-12 molecular sieve are Hydrogen or ammonium type, and sodium weight content is lower than 2%; In mixture by weight percentage, the amount of MOR type zeolite is the amount of 10 ~ 90%, ZSM-12 molecular sieve is 10 ~ 90%.
For solve the problems of the technologies described above two, the technical solution used in the present invention is as follows: a kind of reproducible polycyclic aromatic hydrocarbon is converted into the preparation method of the catalyst of mononuclear aromatics, comprises the following steps:
1., after the binding agent of at least one be selected from gama-alumina, η-aluminium oxide, boehmite of the MOR type zeolite of aequum and the mixture of ZSM-12 molecular sieve and aequum being carried out kneading, shaping, drying, catalyst carrier is obtained at 450 ~ 650 DEG C of roasting 0.5 ~ 24h;
2. the precursor solution being selected from least one metal in Pt, Pd or Ir or its oxide of aequum is impregnated into 0.5 ~ 24h in catalyst carrier in 30 ~ 50 DEG C, obtains finished catalyst at 300 ~ 450 DEG C of roasting 0.5 ~ 24h after drying.
In technique scheme, in catalyst support preparation process, preferred version is, adds and presses the extrusion aid of carrier dry basis 2 ~ 5%, and extrusion aid is at least one in sesbania powder or tung oil; Add and press the gelatinizing agent of carrier dry basis 3 ~ 6%, gelatinizing agent is selected from least one in hydrochloric acid, nitric acid, acetic acid, tartaric acid, citric acid or oxalic acid and water volume ratio 1:1 ~ 1:5.
The precursor solution preferred version of Pt metal used in technique scheme is chloroplatinic acid; The precursor solution preferred version of metal Pd is at least one in palladium nitrate or palladium bichloride; The precursor solution preferred version of metal Ir is chloro-iridic acid.
For solve the problems of the technologies described above three, the technical solution used in the present invention is as follows: a kind of reproducible polycyclic aromatic hydrocarbon is converted into the method for mononuclear aromatics, raw material Polycyclic Aromatic Hydrocarbon Mixture mixes with hydrogen, pass through beds, at reaction temperature 345 ~ 430 DEG C, reaction pressure 4 ~ 7 MPa, weight (hourly) space velocity (WHSV) degree 1 ~ 5hr
-1, under hydrogen/hydrocarbon mol ratio 4.0 ~ 8.0 condition with above-mentioned catalyst exposure described in any one, polycyclic aromatic hydrocarbon is converted into the mononuclear aromatics comprising benzene,toluene,xylene.
In technique scheme, preferred technical scheme is, reaction temperature is 350 ~ 390 DEG C, reaction pressure is 5 ~ 6 MPa, weight (hourly) space velocity (WHSV) degree is 1 ~ 2 hr
-1, hydrogen/hydrocarbon mol ratio is 6.0 ~ 7.0.
For solve the problems of the technologies described above four, the technical solution used in the present invention is as follows: a kind of reproducible polycyclic aromatic hydrocarbon is converted into the renovation process of the catalyst of mononuclear aromatics, when catalyst described in any one regenerates after running by described process conditions, regeneration atmosphere to be air or oxygen content be 1 ~ 5% nitrogen, regeneration temperature be 400 ~ 500 DEG C, reaction pressure is 0.5 ~ 3MPa, the recovery time is 6 ~ 48h.
In technique scheme, preferred technical scheme is, regeneration atmosphere to be oxygen content be 2 ~ 3% nitrogen, regeneration temperature be 500 DEG C, reaction pressure is 0.5 ~ 1MPa, the recovery time is 24 ~ 36h.
Catalyst provided by the invention can be used for heavy polycyclic aromatic hydrocarbon and is converted in the industrial production of the mononuclear aromatics such as benzene, toluene and dimethylbenzene.
Owing to have selected the MOR type zeolite of ZSM-12 molecular sieve containing macropore and good thermal stability as catalyst acid center in the present invention, be conducive to the acid site that the large molecule of heavy arene enters in duct and carry out ring-opening reaction, product molecule after conversion can pass through duct rapid diffusion, thus delayed the deactivation rate of catalyst, and have good stability, be conducive to the regeneration after service cycle; Be there is by load the precious metal element of hydrogenating function, control its load capacity at a zone of reasonableness, effectively can improve the degree of unsaturation of Polycyclic Aromatic Hydrocarbon Mixture raw material, help deep conversion polycyclic aromatic hydrocarbon; Control particle diameter and the catalyst serviceability temperature of metallic atom, the regenerability also contributing to catalyst is stablized; The rational proportion of catalyst acid center and metallic element not only can the acid site of guard catalyst; and in course of reaction, retain original mononuclear aromatics component in feed stream as far as possible; to make the yield of mononuclear aromatics and selective maximization, achieve good technique effect.
The present invention use overcritical fixed bed reactors carry out polycyclic aromatic hydrocarbon be converted into mononuclear aromatics reactivity worth investigate, reactor inside diameter Ф 12 millimeters, length 800 millimeters, stainless steel.Adopt electrical heating, temperature automatic control.It is supporter that reactor bottom fills Ф 2 ~ 3 millimeters of beades, catalyst filling 5 grams in reactor, and Ф 2 ~ 3 millimeters of beades are filled on top, is made for the use of raw material preheating and vaporization.Raw material Polycyclic Aromatic Hydrocarbon Mixture mixes with hydrogen, passes through beds, at reaction temperature 345 ~ 430 DEG C, reaction pressure 4 ~ 7 MPa, weight (hourly) space velocity (WHSV) degree 1 ~ 5 hr
-1, hydrogen/hydrocarbon mol ratio 4.0 ~ 8.0 condition under contact with catalyst, make polycyclic aromatic hydrocarbon be converted into the mononuclear aromatics such as benzene,toluene,xylene.
Polycyclic Aromatic Hydrocarbon Mixture is autogamy raw material, and experimental data is calculated as follows.
Below by embodiment, the present invention is further elaborated.
Detailed description of the invention
[embodiment 1]
Be 25 g MOR types zeolite (being purchased ammonium type), 25 g ZSM-12 molecular sieves (being purchased Hydrogen) and 50 g γ-Al by butt
2o
3(industrial goods) add blender to evenly, in mixture, then add 3 g sesbania powder, 5 g volume ratio 1:1 HNO
3solution and 40 g deionized waters, the dough being suitable for extruding evenly is made in grinding.It extruded by mould, shape is elongated cylindrical (diameter 1.7 mm), in 550 DEG C of roasting 4 h after 120 DEG C of oven dry, is then cut into the carrier granular (1.7 × 4.0 mm) of consistent size, is designated as Z1.
Flooded carrier granular at 40 DEG C by chloroplatinic acid wiring solution-forming, the amount containing Pt in maceration extract is 0.2% of carrier butt weight, and dipping 8h also after drying, at 450 DEG C of roasting 3 h, obtains finished catalyst A.
[embodiment 2 ~ 10]
The preparation method provided according to embodiment 1 and process, by changing the contamination of metal precursor in carrier composition and maceration extract, prepared a series of finished catalyst, in table 1.
Table 1
[embodiment 11 ~ 19]
(wherein B is benzene with catalyst A ~ J (highest response pressure 10MPa, serviceability temperature are room temperature ~ 600 DEG C) investigation on overcritical fixed bed reactors that embodiment 1 ~ 10 is obtained, Polycyclic Aromatic Hydrocarbon Mixture to be converted into BTX, T is toluene, and X is dimethylbenzene) etc. the ability of mononuclear aromatics.Table 2 is for evaluating raw material composition.Catalyst packing 5 g, at reaction temperature 350 DEG C, reaction pressure 5.5MPa, weight (hourly) space velocity (WHSV) degree 2.0hr
-1, contact with catalyst under hydrogen/hydrocarbon mol ratio 6.0 condition, product to be reclaimed and component detects, conversion results is shown in Table 3.
Table 2
| Raw material forms | Non-aromatic | Benzene | Toluene | Ethylbenzene | Dimethylbenzene | Decahydronaphthalene | Naphthane | Naphthalene |
| Content (wt%) | 0.02 | 24.54 | 24.61 | 5.00 | 0.02 | 14.81 | 15.25 | 15.75 |
Table 3
| Catalyst is numbered | Total conversion (wt%) | Mononuclear aromatics selective (wt%) | BTX selective (wt%) |
| A | 71.6 | 69.2 | 45.0 |
| B | 72.0 | 68.4 | 44.3 |
| C | 70.8 | 70.5 | 45.9 |
| D | 72.5 | 69.1 | 44.7 |
| E | 73.1 | 68.0 | 44.1 |
| F | 69.4 | 71.5 | 46.6 |
| G | 70.3 | 69.9 | 45.3 |
| H | 70.6 | 69.5 | 45.1 |
| I | 65.2 | 74.9 | 48.6 |
| J | 74.7 | 66.4 | 43.2 |
[embodiment 20 ~ 24]
After investigating regeneration with catalyst A ~ E that embodiment 1 ~ 5 is obtained on overcritical fixed bed reactors, Polycyclic Aromatic Hydrocarbon Mixture is converted into the ability of the mononuclear aromatics such as BTX.Catalyst packing 5 g, at reaction temperature 360 DEG C, reaction pressure 5.5MPa, weight (hourly) space velocity (WHSV) degree 2.0 hr
-1, contact with catalyst under hydrogen/hydrocarbon mol ratio 6.0 condition, product to be reclaimed and component detects, conversion results is shown in Table 4.
Table 4
| Catalyst is numbered | Total conversion (wt%) | Mononuclear aromatics selective (wt%) | BTX selective (wt%) |
| A | 73.8 | 68.0 | 44.9 |
| B | 74.5 | 67.1 | 44.0 |
| C | 72.8 | 68.5 | 45.4 |
| D | 75.0 | 66.4 | 43.8 |
| E | 75.2 | 66.0 | 43.2 |
[embodiment 25 ~ 29]
After investigating regeneration with catalyst A ~ E that embodiment 1 ~ 5 is obtained on overcritical fixed bed reactors, Polycyclic Aromatic Hydrocarbon Mixture is converted into the ability of the mononuclear aromatics such as BTX.Catalyst packing 5 g, at reaction temperature 350 DEG C, reaction pressure 6.0MPa, weight (hourly) space velocity (WHSV) degree 2.0 hr
-1, contact with catalyst under hydrogen/hydrocarbon mol ratio 7.0 condition, product to be reclaimed and component detects, conversion results is shown in Table 5.
Table 5
| Catalyst is numbered | Total conversion (wt%) | Mononuclear aromatics selective (wt%) | BTX selective (wt%) |
| A | 72.0 | 69.0 | 44.3 |
| B | 72.5 | 68.1 | 44.0 |
| C | 71.0 | 70.2 | 45.5 |
| D | 72.9 | 68.3 | 44.4 |
| E | 73.5 | 67.6 | 43.8 |
[embodiment 30 ~ 34]
After investigating regeneration with catalyst A ~ E that embodiment 1 ~ 5 is obtained on overcritical fixed bed reactors, Polycyclic Aromatic Hydrocarbon Mixture is converted into the ability of the mononuclear aromatics such as BTX.Catalyst packing 5 g, at reaction temperature 350 DEG C, reaction pressure 6.0MPa, weight (hourly) space velocity (WHSV) degree 1.0 hr
-1, contact with catalyst under hydrogen/hydrocarbon mol ratio 7.0 condition, product to be reclaimed and component detects, conversion results is shown in Table 6.
Table 6
| Catalyst is numbered | Total conversion (wt%) | Mononuclear aromatics selective (wt%) | BTX selective (wt%) |
| A | 73.3 | 70.5 | 45.7 |
| B | 73.9 | 69.3 | 45.1 |
| C | 72.1 | 71.8 | 46.4 |
| D | 74.5 | 68.8 | 44.3 |
| E | 74.9 | 68.7 | 44.0 |
[embodiment 35 ~ 39]
Checking and rating 400hr with catalyst A ~ E that embodiment 1 ~ 5 is obtained is placed in air atmosphere, and under pressure 1MPa, 3hr loads ability Polycyclic Aromatic Hydrocarbon Mixture being converted into by overcritical fixed bed reactors the mononuclear aromatics such as BTX after investigation regeneration after being warming up to 500 DEG C of constant temperature regeneration 8hr.Catalyst packing 5 g, at reaction temperature 350 DEG C, reaction pressure 5.5MPa, weight (hourly) space velocity (WHSV) degree 2.0 hr
-1, contact with catalyst under hydrogen/hydrocarbon mol ratio 6.0 condition, product to be reclaimed and component detects, conversion results is shown in Table 7.
Table 7
| Catalyst is numbered | Total conversion (wt%) | Mononuclear aromatics selective (wt%) | BTX selective (wt%) |
| A | 71.0 | 71.4 | 46.2 |
| B | 71.6 | 70.6 | 45.8 |
| C | 68.8 | 72.9 | 46.5 |
| D | 71.6 | 71.7 | 45.3 |
| E | 72.7 | 70.3 | 45.9 |
[embodiment 40 ~ 44]
Checking and rating 400hr with catalyst A ~ E that embodiment 1 ~ 5 is obtained is placed in air atmosphere, and under pressure 0.5MPa, 3hr loads ability Polycyclic Aromatic Hydrocarbon Mixture being converted into by overcritical fixed bed reactors the mononuclear aromatics such as BTX after investigation regeneration after being warming up to 500 DEG C of constant temperature regeneration 24hr.Catalyst packing 5 g, at reaction temperature 350 DEG C, reaction pressure 5.5MPa, weight (hourly) space velocity (WHSV) degree 2.0 hr
-1, contact with catalyst under hydrogen/hydrocarbon mol ratio 6.0 condition, product to be reclaimed and component detects, conversion results is shown in Table 8.
Table 8
| Catalyst is numbered | Total conversion (wt%) | Mononuclear aromatics selective (wt%) | BTX selective (wt%) |
| A | 71.3 | 72.0 | 46.8 |
| B | 72.0 | 71.0 | 46.0 |
| C | 69.3 | 73.1 | 47.1 |
| D | 72.1 | 72.4 | 45.9 |
| E | 72.5 | 70.7 | 46.2 |
Claims (10)
1. reproducible polycyclic aromatic hydrocarbon is converted into a catalyst for mononuclear aromatics, in catalyst weight percent, comprises following component:
A) mixture of 30 ~ 65% MOR type zeolites and ZSM-12 molecular sieve;
B) 34.5 ~ 69.9% at least one be selected from gama-alumina, η-aluminium oxide or boehmite are binding agent;
C) 0.1 ~ 0.5% at least one metal in Pt, Pd or Ir or its oxide is selected from.
2. reproducible polycyclic aromatic hydrocarbon according to claim 1 is converted into the catalyst of mononuclear aromatics, and it is characterized in that MOR type zeolite and ZSM-12 molecular sieve are Hydrogen or ammonium type, sodium weight content is lower than 2%; In mixture, the amount of MOR type zeolite is the amount of 10 ~ 90%, ZSM-12 molecular sieve is by weight percentage 10 ~ 90%.
3. reproducible polycyclic aromatic hydrocarbon according to claim 1 is converted into the preparation method of the catalyst of mononuclear aromatics, comprises the following steps:
1., after the binding agent of the MOR type zeolite of aequum and the mixture of the ZSM-12 molecular sieve of aequum and at least one be selected from gama-alumina, η-aluminium oxide or boehmite of aequum being carried out kneading, shaping, drying, catalyst carrier is obtained at 450 ~ 650 DEG C of roasting 0.5 ~ 24h;
2. the precursor solution being selected from least one metal in Pt, Pd or Ir or its oxide of aequum is impregnated into 0.5 ~ 24h in catalyst carrier in 30 ~ 50 DEG C, obtains finished catalyst at 300 ~ 450 DEG C of roasting 0.5 ~ 24h after drying.
4. reproducible polycyclic aromatic hydrocarbon according to claim 3 is converted into the preparation method of the catalyst of mononuclear aromatics, it is characterized in that the extrusion aid added in catalyst support preparation process by carrier dry basis 2 ~ 5%; Adding at least one acid solution be selected from hydrochloric acid, nitric acid, acetic acid, tartaric acid, citric acid or oxalic acid in catalyst support preparation process is gelatinizing agent.
5. reproducible polycyclic aromatic hydrocarbon according to claim 4 is converted into the preparation method of the catalyst of mononuclear aromatics, it is characterized in that extrusion aid is at least one in sesbania powder or tung oil.
6. reproducible polycyclic aromatic hydrocarbon according to claim 4 is converted into the preparation method of the catalyst of mononuclear aromatics, it is characterized in that with carrier dry basis, the gelatinizing agent of add in catalyst support preparation process 3 ~ 6 % by weight, in gelatinizing agent, the volume ratio being selected from least one in hydrochloric acid, nitric acid, acetic acid, tartaric acid, citric acid or oxalic acid and water is 1:1 ~ 1:5.
7. reproducible polycyclic aromatic hydrocarbon according to claim 4 is converted into the preparation method of the catalyst of mononuclear aromatics, it is characterized in that the precursor solution of described Pt metal is chloroplatinic acid; The precursor solution of metal Pd is at least one in palladium nitrate or palladium bichloride; The precursor solution of metal Ir is chloro-iridic acid.
8. reproducible polycyclic aromatic hydrocarbon is converted into a method for mononuclear aromatics, and raw material Polycyclic Aromatic Hydrocarbon Mixture mixes with hydrogen, passes through beds, at reaction temperature 345 ~ 430 DEG C, reaction pressure 4 ~ 7 MPa, weight (hourly) space velocity (WHSV) degree 1 ~ 5 hr
-1, under hydrogen/hydrocarbon mol ratio 4.0 ~ 8.0 condition with catalyst exposure described in any one in claim 1 ~ 2, polycyclic aromatic hydrocarbon is converted into the mononuclear aromatics comprising benzene,toluene,xylene.
9. reproducible polycyclic aromatic hydrocarbon according to claim 8 is converted into the method for mononuclear aromatics, it is characterized in that reaction temperature 350 ~ 390 DEG C, reaction pressure 5 ~ 6MPa, weight (hourly) space velocity (WHSV) degree 1 ~ 2 hr
-1, hydrogen/hydrocarbon mol ratio 6.0 ~ 7.0 condition under with catalyst exposure.
10. a reproducible polycyclic aromatic hydrocarbon is converted into the renovation process of the catalyst of mononuclear aromatics, when regenerating after the catalyst in claim 1 ~ 2 described in any one is run by the process conditions of claim 8 or 9, regeneration atmosphere to be air or oxygen content be 1 ~ 5% nitrogen, regeneration temperature be 400 ~ 500 DEG C, reaction pressure is 0.5 ~ 3MPa, the recovery time is 6 ~ 48h.
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| CN104549469B (en) | 2017-09-15 |
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