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Method for producing ethylbenzene by reacting pure ethylene or dry gas with benzene

A pure ethylene and dry gas technology, applied in chemical instruments and methods, hydrocarbons, chemical recovery, etc., can solve problems such as high xylene impurity content, poor catalyst stability, and low ethylbenzene purity

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, in the process of producing ethylbenzene by reacting pure ethylene or dry gas with benzene, the xylene impurity content in the product ethylbenzene is high, the purity of ethylbenzene is low, the stability of the catalyst is poor, and the regeneration cycle and To solve the problem of short service life, provide a new method of producing ethylbenzene by reacting pure ethylene or dry gas with benzene

Method used

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  • Method for producing ethylbenzene by reacting pure ethylene or dry gas with benzene
  • Method for producing ethylbenzene by reacting pure ethylene or dry gas with benzene

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Embodiment 1

[0026] Pack 4 grams of catalyst A in the upper two layers of the four-bed fixed-bed reactor; pack 4 grams of catalyst B in the lower two layers of the four-bed fixed-bed reactor. Using pure ethylene as raw material, the total benzene / ethylene molar ratio is 6.5 / 1, and the ethylene weight space velocity is 2.0 hours -1 , 80.6% of benzene enters from the top of the reactor, the conversion rate of ethylene is 99.92%, and the selectivity of ethylbenzene is 93.80%. The content of impurities and impurities and the stability of the catalyst are obviously better than the level when using the same active catalyst.

[0027] The transalkylation reaction is carried out in a single-bed reactor equipped with 6 grams of β molecular sieve catalyst, at a reaction temperature of 260 ° C, a reaction pressure of 3.7 MPa, a benzene / polyethylbenzene molar ratio of 8, and a total space velocity of 1.0 hours -1 Under the conditions, the conversion rate of diethylbenzene was 66.5% in one pass. The r...

Embodiment 2

[0029] Pack 4 grams of catalyst A in the upper two layers of the four-bed fixed-bed reactor; pack 4 grams of catalyst B in the lower two layers of the four-bed fixed-bed reactor. Using pure ethylene as raw material, the total benzene / ethylene molar ratio is 6.5 / 1, and the ethylene weight space velocity is 2.0 hours -1 , 90.7% of benzene enters from the top of the reactor, the conversion rate of ethylene is 99.93%, and the selectivity of ethylbenzene is 92.8%. time level.

[0030] The transalkylation reaction is carried out in a single-bed reactor equipped with 6 grams of β molecular sieve catalyst, at a reaction temperature of 260 ° C, a reaction pressure of 3.8 MPa, a benzene / polyethylbenzene molar ratio of 8, and a total space velocity of 1.0 hours -1 Under the conditions, the conversion rate of diethylbenzene was 67.3% in one pass. The reaction product passes through the separation and recovery system to separate benzene, ethylbenzene, polyethylbenzene and heavy component...

Embodiment 3

[0040] 4 grams of Catalyst C are packed in the upper 2 layers of the four-bed fixed-bed reactor; 4 grams of Catalyst D are packed in the lower 2 layers of the four-bed fixed-bed reactor. The dry gas used contains free water 170ppm, H 2 S7500mg / m 3 , CO 2 3.0 (body)%, C 3 ＝ and C 4 ＝ 0.7 (volume)% and ethylene 14.8% components, directly react with benzene without pre-purification, the total benzene / ethylene molar ratio is 6.5 / 1, and the ethylene weight space velocity is 0.7 hours -1 , 80.5% of benzene enters from the top of the reactor, the ethylene conversion rate is 99.82%, and the selectivity of ethylbenzene is 91.7%. The inlet temperature of each catalyst bed is lower than that of a single catalyst, and the xylene and impurities produced The same content and the stability of the catalyst are significantly better than the level when using a single catalyst.

[0041] The transalkylation reaction is carried out in a single-bed reactor equipped with 6 grams of Y molecula...

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Abstract

The invention relates to a method for producing ethylbenzene by reacting pure ethylene or dry gas with benzene, mainly solving the problems of high dimethylbenzene impurity content in the product ethylbenzene, low ethylbenzene purity, poor catalyst stability and short regeneration period and service life in the process of producing ethylbenzene by reacting pure ethylene or dry gas with benzene in the prior art. In the invention, at least a section of ZSM-5 molecular sieve catalyst I the SiO2 / Al2O3 mol ratio of which is 50-150, and at least a section of ZSM-5 molecular sieve catalyst II the SiO2 / Al2O3 mol ratio of which is 160-300 are loaded in an alkylation fixed bed type reactor; 30-70wt% of pure ethylene or dry gas enters the bed loaded with the catalyst I, and the residual pure ethylene or dry gas enters the bed loaded with the catalyst II; 80-100wt% of benzene enters the first section of the bed loaded with the catalyst I from the top of the reactor, and the residual benzene enters each catalyst bed below section by section; and the difference between the inlet temperature of each section of catalyst bed and the material inlet temperature at the top of the reactor is controlled not to exceed + / -5 DEG C. The technical scheme better solves the problems and can be used in the industrial production of ethylbenzene by reacting the pure ethylene or the dry gas with the benzene.

Description

technical field [0001] The invention relates to a method for producing ethylbenzene by reacting pure ethylene or dry gas with benzene. Background technique [0002] Ethylbenzene is an important petrochemical raw material, mainly used in the production of styrene, which is the main raw material for the production of polystyrene and other copolymer resins. [0003] Ethylbenzene can be produced by various processes. Traditional catalysts include crystalline and amorphous silica, boron fluoride, alumina, phosphoric acid, aluminum trichloride and solid phosphoric acid catalysts. These traditional catalytic processes have the disadvantages of serious corrosion, large equipment investment, and many wastes. In recent years, people have conducted extensive and in-depth research on molecular sieves, and some companies have been devoting themselves to the new technology of using molecular sieves as catalysts to produce ethylbenzene. One of these, which has achieved significant commer...

Claims

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Application Information

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IPC IPC(8): C07C15/073C07C2/66
CPCY02P20/584
Inventor 孙洪敏杨为民张斌宦明耀
Owner CHINA PETROLEUM & CHEM CORP
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