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Method for selective toluene disproportionation and transalkylation of benzene and C9 aromatics

A C9 aromatic hydrocarbon alkylation and transfer method technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve high energy consumption, large circulation volume of xylene separation unit and isomerization unit, and low concentration and other issues, to achieve the effect of reducing the scale of treatment, achieving flexibility and increasing concentration

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

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that in the production of p-xylene in the prior art, there are problems such as the low concentration of p-xylene in the mixed xylene, resulting in large circulation of xylene separation unit and isomerization unit, high energy consumption, etc., providing A new production method of p-xylene

Method used

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  • Method for selective toluene disproportionation and transalkylation of benzene and C9 aromatics
  • Method for selective toluene disproportionation and transalkylation of benzene and C9 aromatics
  • Method for selective toluene disproportionation and transalkylation of benzene and C9 aromatics

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Embodiment 1

[0025] according to figure 2 The process shown is based on the C in typical reformed depentanized oil 6 A~C 10 + The composition of various hydrocarbon substances is used as the basic data to investigate the ability of the present invention to produce p-xylene and benzene and the processing scale of each unit. The composition distribution of aromatics sent out from a typical reformer and the flow rate of each component used in this example are shown in Table 1.

[0026] The benzene and carbon nine aromatics transalkylation process unit uses a fixed-bed reactor filled with a β-zeolite catalyst containing 0.05% bismuth. The reaction conditions are: reaction temperature 385 ° C, pressure 3.0 MPa, weight space velocity 2.0 Hour -1 , a hydrogen / hydrocarbon molar ratio of 3.0. Aromatic raw materials are mixed with hydrogen and then passed through the catalyst bed from top to bottom for C 9 + A dealkylation reaction to produce benzene, toluene and C 8 a.

[0027] The toluen...

Embodiment 2

[0043] according to figure 2 The process shown is based on the C in typical reformed depentanized oil 6 A~C 10 + The composition of various hydrocarbon substances is used as the basic data to investigate the ability of the present invention to produce p-xylene and benzene and the processing scale of each unit. The composition distribution of aromatics sent out from a typical reformer and the flow rate of each component used in this example are shown in Table 1.

[0044] The benzene and carbon nine aromatics transalkylation process unit adopts a fixed-bed reactor, and the reactor is filled with a hydrogen-type MCM-22 zeolite catalyst containing 0.30% bismuth. The reaction conditions are: reaction temperature 460°C, pressure 41.0MPa, weight space velocity 3.0 hours -1 , a hydrogen / hydrocarbon molar ratio of 8.0. Aromatic raw materials are mixed with hydrogen and then passed through the catalyst bed from top to bottom for C 9 + A dealkylation reaction to produce benzene, ...

Embodiment 3

[0055] according to figure 2The process shown is based on the C in typical reformed depentanized oil 6 A~C 10 + The composition of various hydrocarbon substances is used as the basic data to investigate the ability of the present invention to produce p-xylene and benzene and the processing scale of each unit. The composition distribution of aromatics sent out from a typical reformer and the flow rate of each component used in this example are shown in Table 1.

[0056] The benzene and carbon nine aromatics transalkylation process unit uses a fixed-bed reactor filled with a hydrogen-type mordenite catalyst containing 0.10% bismuth. The reaction conditions are: reaction temperature 320 ° C, pressure 1.0 MPa, weight space velocity 0.8 Hour -1 , a hydrogen / hydrocarbon molar ratio of 2.0. Aromatic raw materials are mixed with hydrogen and then passed through the catalyst bed from top to bottom for C 9 + A dealkylation reaction to generate benzene, toluene and C 8 a.

[00...

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Abstract

The invention relates to a method for selective toluene disproportionation and the transalkylation of benzene and C9 aromatics and mainly solves the problems of low paraxylene concentration in mixed xylenes, large aromatic hydrocarbon processing circulating volume, strict reaction raw material requirements and high energy consumption in the production of paraxylene in the prior art. The invention adopts a technical scheme that: in the mixed raw materials separated from a reforming unit, the C9 aromatics and a third fraction of benzene enter a benzene and C9 aromatic transalkylation technical unit to undergo a dealkylation reaction to form a section fraction of benzene, a second fraction of toluene and a second fraction of C8 aromatics; the toluene enters a selective toluene disproportionation unit to undergo a selective disproportionation reaction to form C8 aromatics and benzene homolog flow containing the paraxylene, a third fraction of C8 aromatic, a third fraction of toluene and the third fraction of benzene are obtained, and the third fraction of toluene is returned to the selective toluene disproportionation unit; and the C8 aromatics separated from the reforming unit, the second fraction of C8 aromatics and the third fraction of C8 aromatics are mixed and delivered to a paraxylene separation unit to obtain the paraxylene. According to the technical scheme, the problem is well solved, and the method can be used in the production of the paraxylene.

Description

technical field [0001] The invention relates to a method for selective disproportionation of toluene and transalkylation of benzene and carbon nine aromatic hydrocarbons. Background technique [0002] P-xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. The typical production method of p-xylene is from the thermodynamically balanced xylene containing ethylbenzene, that is, C8 aromatics generated by catalytic reforming of naphtha, through multi-stage cryogenic crystallization separation or molecular sieve simulated moving bed adsorption separation (adsorption separation for short) Technology to separate p-xylene from a mixture of isomers with similar boiling points. For the treatment of ortho- and meta-xylene, C 8 A isomerization (referred to as isomerization) technology to isomerize it into p-xylene. In orde...

Claims

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Application Information

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IPC IPC(8): C07C6/12C07C15/08C07C15/02B01J29/40
CPCY02P20/52
Inventor 钟禄平孔德金肖剑卢咏琰
Owner CHINA PETROLEUM & CHEM CORP
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