Method for preparing ethylbenzene by alkylating pure ethylene or dry gas and benzene

A technology for benzene alkylation and pure ethylene, applied in chemical instruments and methods, organic chemistry, chemical recovery, etc., can solve problems such as short regeneration cycle and service life, poor catalyst stability, and low purity of ethylbenzene

Active Publication Date: 2011-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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 gas-phase alkylation reaction of pure ethylene or dry gas and benzene in the prior art, the xylene impurity content in the product ethylbenzene is high, the purity of ethylbenzene is low, the stability of the catalyst is poor, the regeneration cycle and the use of To solve the problem of short life, provide a new method for producing ethylbenzene by alkylation of pure ethylene or dry gas with benzene

Method used

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  • Method for preparing ethylbenzene by alkylating pure ethylene or dry gas and benzene
  • Method for preparing ethylbenzene by alkylating pure ethylene or dry gas and benzene
  • Method for preparing ethylbenzene by alkylating pure ethylene or dry gas and benzene

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Embodiment 1

[0020] 4 grams of Catalyst A are packed in the upper 2 layers of the four-bed fixed-bed reactor, and 4 grams of Catalyst B are packed in the lower 2 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. Reaction result: ethylene conversion rate is 99.92%, ethyl selectivity is 99.83%. The inlet temperature of each catalyst bed is lower than when the same active catalyst is used, and the xylene and impurity content and the stability of the catalyst are significantly better than the level when the same active catalyst is used. The detailed results are shown in Table 1. .

Embodiment 2

[0022] 4 grams of Catalyst A are packed in the upper 2 layers of the four-bed fixed-bed reactor, and 4 grams of Catalyst B are packed in the lower 2 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. Reaction result: ethylene conversion rate is 99.93%, and ethyl selectivity is 99.72%, and the xylene and impurity content of generation and the stability of catalyst are also significantly better than the level when using the same active catalyst. The detailed results are shown in Table 1.

[0023] Table 1 Alkylation reaction of pure ethylene in four-bed reactor

[0024]

Embodiment 3

[0030] 4 grams of Catalyst C are packed in the upper 2 layers of the four-bed fixed-bed reactor, and 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. Reaction result: ethylene conversion rate is 99.82%, ethyl selectivity is 99.57%. The inlet temperature of each catalyst bed is lower than that of a single catalyst, and the content of xylene and impurities and the stability of the catalyst are significantly better than that of a single catalyst. The detailed results are shown in Table 2.

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Abstract

The invention relates to a method for preparing ethylbenzene by alkylating pure ethylene or dry gas and benzene, which mainly solves the problem of the prior art of which the impurity dimethylbenzene content within the product ethylbenzene obtained by gas phase alkylation of pure ethylene or dry gas and benzene is high, the purity of ethylbenzene is low, the stability of the catalyst is bad, the regeneration period is short and the service life is short. The method provided by the invention solves the problem of the prior art by loading at least a section of ZSM-5 molecular sieve catalyst I which comprises SiO2 / Al2O3 with a mol ratio of 50 to 150 and at least a section of ZSM-5 molecular sieve catalyst II which comprises SiO2 / Al2O3 with a mol ratio of 160 to 300 on a fixed bed reactor, entering 30 to 70% by weight of pure ethylene or dry gas into the bed layer wherein the catalyst I is loaded, entering the residual pure ethylene or dry gas into the bed layer wherein the catalyst II isloaded, feeding 80 to 100% by weigh of benzene into the first section bed layer wherein the catalyst I is loaded from the top of the reactor, feeding the residual benzene into the following sections of catalyst bed layer, and controlling the difference between the inlet temperature of each section of catalyst bed layer and the inlet temperature on the top of the reactor in the scope of -5 DEG C to +5 DEG C. The method provided by the invention can be applied to the industrial production of ethylbenzene by alkylating pure ethylene or dry gas and benzene.

Description

technical field [0001] The invention relates to a method for producing ethylbenzene by alkylation of pure ethylene or dry gas and benzene, in particular to a method for producing ethylbenzene under gas-phase alkylation conditions of pure ethylene or dry gas and 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C2/66B01J29/40
CPCY02P20/584
Inventor 孙洪敏杨为民张斌宦明耀
Owner CHINA PETROLEUM & CHEM CORP
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