Method for producing ethylbenzene and styrene through side chain alkylation of toluene and methanol

A styrene and alkylation technology, applied in the production of ethylbenzene and styrene, can solve the problems of low utilization rate of methanol, easy decomposition of methanol, etc.

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the problem that methanol is easy to decompose in the prior art, resulting in

Method used

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  • Method for producing ethylbenzene and styrene through side chain alkylation of toluene and methanol
  • Method for producing ethylbenzene and styrene through side chain alkylation of toluene and methanol
  • Method for producing ethylbenzene and styrene through side chain alkylation of toluene and methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Toluene and a first stream of methanol enter the first reaction zone where they contact the catalyst to produce a first reaction effluent. The first reaction effluent and the second methanol enter the second reaction zone and contact the catalyst to generate the second reaction effluent. The second reaction effluent enters a third reaction zone where it contacts the catalyst to produce a third reaction effluent comprising ethylbenzene and styrene. Ethylbenzene and styrene were separated from the third reaction effluent.

[0037] Wherein, the first reaction zone, the second reaction zone and the third reaction zone are all primary fixed-bed reactors, and the catalysts loaded therein are all KCsX. The temperature in the first reaction zone is 385°C, and the reaction weight hourly space velocity is 2.7 hours -1 , the reaction pressure is 0.1MPa. The temperature in the second reaction zone is 400°C, and the reaction weight hourly space velocity is 3 hours -1 , the react...

Embodiment 2

[0044] Same as [Example 1], except that the operating conditions of each reaction zone are changed, and the catalysts loaded therein are all KCsX. The temperature in the first reaction zone is 380°C, and the reaction weight hourly space velocity is 2.5 hours -1 , the reaction pressure is 0.15MPa. The temperature in the second reaction zone is 400°C, and the reaction weight hourly space velocity is 2.9 hours -1 , the reaction pressure is 0.1MPa. The temperature in the third reaction zone is 410°C, and the reaction weight hourly space velocity is 2.9 hours -1 , the reaction pressure is 0.09MPa. The molar ratio of toluene to the first methanol was 5:1, and the molar ratio of toluene to the second methanol in the first reaction effluent was 4:1.

[0045] The operating conditions of the toluene tower are: tower top temperature: 115°C, tower top pressure: 170KPa, number of trays: 35, tower bottom temperature: 165°C, tower bottom pressure: 200KPa, reflux ratio: 10.

[0046] The ...

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Abstract

The invention mainly relates to a method for producing ethylbenzene and styrene through side chain alkylation of toluene and methanol, which is mainly used for solving the problems that methanol is easily decomposed and consequently the utilization rate of methanol is low in the prior art. The method comprises the steps that a) toluene and the first part of methanol enter a first reaction area and contact with a catalyst to generate a material flow I; b) the material flow I and the second part of methanol enter at least one second reaction area and contact with a catalyst to generate a material flow II; c) the material flow II enters at least one third reaction area and contacts with a catalyst to generate a material flow III containing ethylbenzene and styrene. By adopting the technical scheme, the problems are better solved, and the method can be applied to the industrial production of preparing ethylbenzene and styrene through side chain alkylation of toluene and methanol.

Description

technical field [0001] The invention relates to a method for producing ethylbenzene and styrene by side-chain alkylation of toluene and methanol. Background technique [0002] Styrene monomer is an important organic chemical raw material, mainly used in the production of polystyrene, ABS resin, styrene-butadiene rubber, unsaturated resin and other products. In addition, it can also be used in pharmaceuticals, dyes, or preparation of pesticide emulsifiers and mineral dressing agents, etc., and has a wide range of uses. The output of styrene series resins ranks third in synthetic resins after PE and PVC. Styrene was discovered in 1839. In 1930, Dow Chemical Company of the United States pioneered the technology of producing styrene by thermal dehydrogenation of ethylbenzene. In 1937, Dow Chemical Company of the United States and BASF of Germany simultaneously realized the industrial production of styrene by dehydrogenation of ethylbenzene. Laid the foundation for the modern l...

Claims

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Application Information

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IPC IPC(8): C07C15/073C07C15/46C07C2/86
Inventor 蒋见缪长喜姜冬宇
Owner CHINA PETROLEUM & CHEM CORP
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