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Method for hydrogenation pyrolysis of prolific benzene and xylene by using pyrolysis gasoline

A technology for hydrocracking and pyrolysis of gasoline, which is applied in the petroleum industry, reforming naphtha, hydrocarbon cracking to produce hydrocarbons, etc., can solve problems such as low utilization value, achieve smooth orifices, avoid solvent extraction process, hydrogenation Moderate performance

Inactive Publication Date: 2010-06-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the traditional solvent extraction and separation process of pyrolysis gasoline only simply separates BTX (B is benzene, T is toluene, and X is xylene) aromatics, and there are a large amount of toluene and heavy aromatics in the light aromatic products. Aromatics and non-aromatics, whose utilization value is low, provide a new method of using pyrolysis gasoline hydrocracking to produce more benzene and xylene

Method used

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  • Method for hydrogenation pyrolysis of prolific benzene and xylene by using pyrolysis gasoline

Examples

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Effect test

Embodiment 1～4

[0021] Binder-free ZSM-5 zeolite (SiO 2 / Al 2 O 3 The molar ratio is 60). It is prepared with reference to Chinese patent CN1915820, and then ion exchanged with ammonium nitrate solution, and after the exchange, it is roasted and converted into hydrogen zeolite. The hydrogen type binderless ZSM-5 zeolite was impregnated with 0.04 parts by weight of Pt and 0.10 parts by weight of Sn, and calcined at 450° C. for 4 hours to obtain catalyst a.

[0022] The reduction activated a catalyst was used for reaction evaluation. The catalyst was in a fixed bed reactor under a hydrogen pressure of 3.0MPa, H 2 / Oil volume ratio 400~600, reaction inlet temperature 350~380℃, weight hourly space velocity WHSV=2.0~4.0 hours -1 In the case of evaluation, the response results are listed in Table 1:

[0023] Table 1 Catalyst a reaction liquid phase product

[0024]

[0025] Where NA is non-aromatic hydrocarbon, C 10 + For carbon ten and above hydrocarbons, E is ethylbenzene.

Embodiment 1

[0026] The content of benzene and toluene in the raw material of Example 1 is relatively high. After the hydrocracking treatment, toluene has a large increase, while benzene and xylene have only a small increase; in Examples 2 to 4, as the benzene content in the raw material decreases, As the toluene content increases, both benzene and toluene increase after treatment, and the increase in toluene decreases. The toluene content of the raw material in Example 4 is the highest, and the toluene does not increase but decreases after treatment. This is because the conversion of aromatics in this reaction is limited by the reaction balance, and pyrolysis gasoline containing more benzene is used for treatment. The content of benzene in the raw material is very high, reaching 30-40%, so the increase of benzene after treatment Smaller. Adopt C 7 + The content of benzene in the pyrolysis gasoline raw material is small, so the increase of benzene after treatment is large. As the content of...

Embodiment 5～8

[0028] Respectively in the hydrogen type binderless ZSM-5 zeolite (SiO 2 / Al 2 O 3 The molar ratio is 90) on the load weight parts of 0.01 parts of Pt and 0.03 parts of Pb, 0.05 parts of Pt and 0.08 parts of Zn, 0.08 parts of Pt and 0.17 parts of Pd, 0.50 parts of Pd at 450° Calcined for 4 hours to obtain catalysts b, c, d and e.

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Abstract

The invention relates to a method for hydrogenation pyrolysis of prolific benzene and xylene by using pyrolysis gasoline. The method mainly solves the problems that only BTX (B is benzene, T is toluene and X is xylene) arene is separated in the traditional process of the pyrolysis gasoline, and the light arene output contains a great amount of toluene with lower utilization value with the separated heavy arene. In the invention, alkyl transfer reaction is carried out among the pyrolysis gasoline material of C7+, the heavy arene hydrogenation and the light arene are in the presence of catalyst, and isomerization reaction is carried out on the light arene into the component rick in BTX light arene; and the liquid-phase is separated into benzene, toluene, xylene and C9+ distillate according to different boiling points, wherein the toluene and the C9+ distillate can be returned for further processing as the feedstock and the light alkane can be separated from gas-phase output, thereby favorably solving the technical problem. The method can be used for the industrial production of light arene.

Description

Technical field [0001] The invention relates to a method for producing more benzene and xylene by using pyrolysis gasoline to hydrocrack. Background technique [0002] In the industry, the reformate produced by the reforming process and the pyrolysis gasoline obtained from the cracking of naphtha are generally solvent extracted to separate BTX aromatics and non-aromatics. This process is based on the extremes of aromatics and non-aromatics in the solvent used. Different in nature, to achieve the purpose of separating target aromatics. Although solvent extraction of BTX can obtain higher purity BTX aromatics, it requires a complex solvent extraction device, and the extraction solvent needs to be continuously replenished during the extraction operation. The solvent extraction method can obtain high purity The mixing of aromatic hydrocarbons is advantageous, but it is disadvantageous in terms of the need for additional solvent extraction equipment and continuous input of solvents d...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C15/02C10G35/095
Inventor 王德举李学礼刘仲能
Owner CHINA PETROLEUM & CHEM CORP
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