Technique for producing ethyl benzene

A technology of ethylbenzene and ethanol, which is applied in the field of production of ethylbenzene, can solve the problems of inconvenient storage and transportation, high prices of ethylene and petroleum benzene, rising price of styrene, etc., and achieve the purpose of inhibiting catalyst coking and long service life , the effect of easy separation

Inactive Publication Date: 2009-06-10
SHANGHAI WUZHENG ENG TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0002] As we all know, ethylbenzene is an important basic organic chemical raw material, and it is also the main raw material source of styrene. The traditional process is mainly through the direct synthesis of ethylene and benzene. In recent years, with the rapid growth of demand for styrene derivatives, the demand for The demand for ethylbenzene is also showing an increasing trend, but due to the sharp rise in crude oil prices after entering the 21st century, the prices of ethylene and petroleum benzene also remain high, resulting in the price of styrene rising steadily, and ethylene raw materials are also It is not convenient for storage and transportation, but using ethanol, especially cheap straw-fermented ethanol as raw material, and benzene to directly synthesize ethylbenzene through ZSM-5 molecular sieve catalytic dehydration can significantly reduce production costs and improve the economic benefits of enterprises. In addition, ethanol is a Renewable resources, making the process more attractive and socially important

Method used

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  • Technique for producing ethyl benzene

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Experimental program
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Effect test

Embodiment 1

[0018] Put 5g of the prepared ZSM-5-containing catalyst into the constant temperature section of the miniature fixed-bed reactor. The reactor is a stainless steel tube with an inner diameter of φ14mm and a wall thickness of 3mm. The particle size of the catalyst is 2.0mm×3.0mm.

[0019] Using benzene-alcohol mixture containing excess benzene as raw material, at a reaction temperature of 400°C, a pressure of 2.0Mpa, and an ethanol weight space velocity of 2h -1 , the reaction was carried out under the condition that the molar ratio of benzyl to alcohol was 6:1. After 8 hours of reaction, the reaction results were as follows: the conversion rate of raw material ethanol was 99.95%, the conversion rate of benzene was 16.47%, and the selectivity of ethylbenzene was 96.36%.

Embodiment 2

[0021] Put 5g of the prepared catalyst containing ZSM-5 into the constant temperature section of the miniature fixed-bed reactor, at a reaction temperature of 350°C, a pressure of 2.0Mpa, and an ethanol weight space velocity of 2h -1 , the reaction was carried out under the condition that the molar ratio of benzyl to alcohol was 6:1. After 8 hours of reaction, the reaction results were as follows: the conversion rate of ethanol was 99.90%, the conversion rate of benzene was 16.03%, and the selectivity of ethylbenzene was 96.12%.

Embodiment 3

[0023] Put 5g of the prepared catalyst containing ZSM-5 into the constant temperature section of the miniature fixed bed reactor, at a reaction temperature of 450°C, a pressure of 2.0Mpa, and an ethanol weight space velocity of 2h -1 , The reaction was carried out under the condition that the molar ratio of benzyl to alcohol was 6:1. After 8 hours of reaction, the reaction results were as follows: ethanol conversion rate was 99.99%, benzene conversion rate was 16.49%, and ethylbenzene selectivity was 95.95%.

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Abstract

The invention provides a method for generating ethyl benzene through ethanol and benzene subjected to a catalytic dehydration reaction, and in particular to a method for taking discarded crop straw fermentation ethanol as a raw material to be synthesized with benzene. The method comprises the following steps: mixing the reaction raw materials in a fixed-bed reactor with the mol ratio of benzene to ethanol of 6:1, adding the mixed raw materials into a heating furnace for evaporation, then adding the raw materials into the fixed-bed reactor so as to be contacted with a catalyst containing a ZSM-5 molecular sieve, carrying out the reaction under at the reaction temperature of 250 to 550 DEG C, the reaction pressure of 0.1 and 3.0 MPa, a ethanol weight airspeed of between 1 and 10h<-1> so as to generate a reaction mixture containing ethyl benzene, and returning the unreacted benzene to the reactor after separation. Compared with the prior method of synthesizing the ethyl benzene through ethene and the benzene, the method has higher economic benefits in a high oil price era; in addition, the method has few reaction side products which can be easily separated. The method has a simple process and can be applied to the industrial production of the ethyl benzene.

Description

technical field [0001] The present invention relates to a clean production method for synthesizing ethylbenzene, specifically, the present invention relates to the method for synthesizing ethylbenzene through catalytic dehydration reaction of benzene and ethanol in the presence of ZSM-5 molecular sieve catalyst, that is, in the same reactor, Ethanol is converted to ethylene by catalytic dehydration first, and ethylene and benzene are further alkylated to form ethylbenzene. Background technique [0002] As we all know, ethylbenzene is an important basic organic chemical raw material, and it is also the main raw material source of styrene. The traditional process is mainly through the direct synthesis of ethylene and benzene. In recent years, with the rapid growth of demand for styrene derivatives, the demand for The demand for ethylbenzene is also showing an increasing trend, but due to the sharp rise in crude oil prices after entering the 21st century, the prices of ethylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C1/00C07C15/073
CPCY02P30/20Y02P30/40
Inventor 王保明顾志华马兴普
Owner SHANGHAI WUZHENG ENG TECH CO LTD
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