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Combined process for transalkylation of benzene and heavy aromatics and methylation of toluene

A heavy aromatic hydrocarbon alkylation and combined process technology, which is applied in the direction of condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, hydrocarbons, hydrocarbons, etc., can solve the problems of benzene overcapacity, reduce the generation of ethylbenzene, increase The effect of high quality, high para-selectivity

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a new combination process of transalkylation of benzene and heavy aromatics and methylation of toluene in order to solve the problems encountered in increasing the production of xylene in the prior art and the dilemma of overcapacity in the benzene market

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  • Combined process for transalkylation of benzene and heavy aromatics and methylation of toluene

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specific Embodiment approach

[0045] The schematic diagram of the technological process of this embodiment is as figure 1 shown. The specific implementation is as follows:

[0046] Benzene and C 9 + A is the reaction raw material, and benzene and C are carried out in a fixed-bed reactor under hydrogen conditions. 9 + A transalkylation reaction, the inner diameter of the reactor is 30mm, the length is 100mm, made of stainless steel. The upper and lower sides of the catalyst bed are filled with glass beads with a particle size of 3 mm to distribute and support the air flow. The upper catalyst bed in the reactor is filled with 15 grams of MOR molecular sieve with 0.03% Pt (the amount of Pt is based on the quality of the MOR molecular sieve) , the lower catalytic bed layer is filled with the ZSM-5 molecular sieve (Re consumption is based on the ZSM-5 molecular sieve quality) of 5 grams of loaded 0.15% Re. Reactive benzene / C 9 A / C 10 + The mass ratio of A is 40 / 50 / 10, and the weight space velocity of t...

Embodiment 2

[0051] The schematic diagram of the technological process of this embodiment is as figure 1 shown. The specific implementation is as follows:

[0052] Benzene and C 9 +A is the reaction raw material, and benzene and C are carried out in a fixed-bed reactor under hydrogen conditions. 9 + A transalkylation reaction, the inner diameter of the reactor is 30mm, the length is 100mm, made of stainless steel. The upper and lower parts of the catalyst bed are filled with glass beads with a particle size of 3 mm for air distribution and support, and the upper catalyst bed in the reactor is filled with 10 grams of MOR molecular sieve loaded with 0.15% Re (the amount of Re is based on the quality of the MOR molecular sieve) , the lower catalytic bed layer is filled with 10 grams of ZSM-48 molecular sieves loaded with 0.02% Pt (the amount of Pt is based on the ZSM-48 molecular sieve quality). Reactive benzene / C 9 A / C 10 + The mass ratio of A is 40 / 50 / 10, and the weight space veloc...

Embodiment 3

[0057] The schematic diagram of the technological process of this embodiment is as figure 1 shown. The specific implementation is as follows:

[0058] Benzene and C 9 + A is the reaction raw material, and benzene and C are carried out in a fixed-bed reactor under hydrogen conditions. 9 + A transalkylation reaction, the inner diameter of the reactor is 30mm, the length is 100mm, made of stainless steel. The upper and lower sides of the catalyst bed are filled with glass beads with a particle size of 3 mm to distribute and support the air flow. The upper catalyst bed in the reactor is filled with 10 grams of Beta molecular sieve with 0.15% Re (the amount of Re is based on the quality of Beta molecular sieve) , the lower catalytic bed layer is filled with the ZSM-5 molecular sieve of 10 grams of loading 0.03% Pt (the amount of Pt is based on the ZSM-5 molecular sieve quality). Reactive benzene / C 9 A / C 10 + The mass ratio of A is 40 / 50 / 10, and the weight space velocity of...

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Abstract

The invention discloses a benzene and heavy aromatic hydrocarbon transalkylation and toluene methylation combined process, which comprises the following steps of: contacting benzene and heavy aromatic hydrocarbon with a transalkylation catalyst in the presence of hydrogen to carry out transalkylation reaction to generate a first product containing toluene and xylene; toluene in the first product and external methanol are in contact with a methylation catalyst under water or / and hydrogen conditions for methylation reaction to generate a second product containing xylene. According to the combined process, benzene and heavy aromatics are efficiently converted into xylene with a high additional value, so that an aromatic hydrocarbon productivity structure is adjusted, the yield of p-xylene is increased, ethylbenzene output in a C8A product can be effectively inhibited, and the quality of xylene is improved.

Description

technical field [0001] The invention relates to the field of xylene production, in particular to a combined process technology of transalkylation of benzene and heavy aromatics and methylation of toluene. Background technique [0002] Xylene is an important basic organic raw material, widely used in medicine, resin, oil and other fields. Xylene has three isomers, namely o-xylene, p-xylene and m-xylene, among which p-xylene has the largest market demand and is mainly used for the preparation of terephthalic acid and dimethyl terephthalate. And then produce polyethylene terephthalate. The current production method of p-xylene is to separate p-xylene from the mixture of isomers with similar boiling points through adsorption separation or crystallization separation technology from the thermodynamically balanced mixed xylenes generated by catalytic reforming of naphtha. The separation of the remaining o-xylene and m-xylene continues to use isomerization technology, and the mixe...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/88C07C6/12B01J29/26B01J29/22B01J29/48B01J29/40B01J29/74B01J29/78B01J29/44B01J37/08B01J37/02
CPCC07C2/88C07C6/126B01J29/26B01J29/22B01J29/48B01J29/40B01J29/44B01J29/7461B01J29/7815B01J37/0009B01J37/0201B01J2229/12B01J2229/186C07C15/08Y02P20/52
Inventor 石张平李经球祁晓岚孔德金
Owner CHINA PETROLEUM & CHEM CORP
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