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Process for producing alkylbenzene

A production method and technology of alkylbenzene, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of high energy consumption, large circulation volume, etc., and achieve enhanced heat transfer, reduced steam volume, and reaction The effect of pressure reduction

Active Publication Date: 2006-11-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there are problems of high energy consumption and large circulation volume in the prior art, and a new production method of alkylbenzene is provided

Method used

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  • Process for producing alkylbenzene
  • Process for producing alkylbenzene
  • Process for producing alkylbenzene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Attached image 3 According to the technical process, 20 grams of the shaped catalyst (20-60 mesh) of crystalline aluminosilicate zeolite with the above-mentioned XRD diffraction data is mixed with an equivalent amount of inert quartz sand of the same particle size to react propylene and benzene to generate cumene, The concentration of cumene at the outlet of the reaction solution is 45%, and the propylene space velocity (WHSV) is 0.8 hours -1 , the adiabatic temperature rise of each stage of reaction is 15°C, the reactor inlet temperature is 145°C, the outlet temperature is 160°C, the reaction propyl group selectivity is 99.1%, the n-propylbenzene content in cumene is less than 350ppm, and the reaction pressure is 2.5MPa. A total of 2000 hours of operation, no loss of catalyst activity was observed, and the steam consumption was 0.28 tons / ton of cumene.

Embodiment 2

[0031] Attached image 3According to the technical process, 20 grams of crystalline aluminosilicate zeolite shaped catalysts (20-60 meshes) with the above XRD diffraction data are mixed with an equal amount of inert quartz sand of the same particle size to react ethylene and benzene to form ethylbenzene. The ethylbenzene concentration at the liquid outlet is 28%, and the ethylene space velocity (WHSV) is 0.3 hours -1 , the adiabatic temperature rise of each stage of reaction is 17°C, the reactor inlet temperature is 233°C, the outlet temperature is 250°C, the reaction ethyl selectivity is 99.3%, the xylene content in ethylbenzene is less than 50ppm, and the reaction pressure is 3.5MPa. A total of 2000 hours of operation, no loss of catalyst activity was observed, and the steam consumption was 0.26 tons / ton of ethylbenzene.

Embodiment 3

[0033] Attached image 3 According to the technical process, 20 grams of the shaped catalyst (20-60 mesh) of crystalline aluminosilicate zeolite with the above-mentioned XRD diffraction data is mixed with an equivalent amount of inert quartz sand of the same particle size to react propylene and benzene to generate cumene, The concentration of cumene at the outlet of the reaction solution is 36%, and the propylene space velocity (WHSV) is 0.8 hours -1 , the adiabatic temperature rise of each stage of reaction is 15°C, the reactor inlet temperature is 145°C, the outlet temperature is 160°C, the reaction propyl group selectivity is 99.2%, the n-propylbenzene content in cumene is less than 350ppm, and the reaction pressure is 2.5MPa. A total of 2000 hours of operation, no loss of catalyst activity was observed, and the steam consumption was 0.30 tons / ton of cumene.

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Abstract

The invention relates to a method for producing alkylbenzene, which mainly solves the problems of high energy consumption and large circulation in the prior art. In the present invention, in the presence of a catalyst, all or part of the raw material benzene is added from the transalkylation reactor, and the olefin enters the alkylation reactor containing at least two stages from the top of the alkylation reactor, and is combined with the alkylation reaction product and the alkylation reactor. Part of the mixture of transalkylation products is reacted to form alkylbenzene, the reaction liquid and transalkylation products are recycled, and a part is returned to the alkylation reactor, and each section of the alkylation reactor adopts the intermediate heat exchanger section heat exchange technology The technical solution of the present invention solves the problem well, and can be used in the industrial production of alkylbenzene.

Description

technical field [0001] The present invention relates to the production method of alkylbenzene, particularly relates to the production method of alkylbenzene which takes heat in an external circulation mode. Background technique [0002] Cumene, ethylbenzene, and long-chain alkylbenzene in alkylbenzene are all important organic chemical raw materials, among which cumene is an important intermediate raw material for the production of phenol and acetone, and ethylbenzene is mainly used as a raw material for the preparation of styrene , while long-chain alkylbenzene is the main raw material for the preparation of detergents. [0003] The traditional industrial preparation of cumene, ethylbenzene and long-chain alkylbenzene uses solid phosphoric acid, aluminum trichloride or hydrofluoric acid series catalysts. , most of which have been replaced by new molecular sieve methods. At present, the production of alkylbenzene has turned to highly selectiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/66C07C15/107
Inventor 周斌高焕新方华顾瑞芳季树芳
Owner CHINA PETROLEUM & CHEM CORP