Process for preparing ethylbenzene by ethylene-containing dry gas liquid phase method

A liquid phase, dry gas technology, applied in chemical instruments and methods, hydrocarbon purification/separation, organic chemistry, etc., can solve the problems of short catalyst operation cycle, low ethylene recovery rate, and many by-products, etc., to improve safety. The effect of operational reliability, high ethylene conversion and selectivity, and increased ethylbenzene yield

Pending Publication Date: 2022-06-28
SINOPEC GUANGZHOU ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the above problems, the present invention provides a process for the production of ethylbenzene by dry gas-liquid phase method containing ethylene, so as to solve the problems of high energy consumption, low ethylene recovery rate, many by-products, and catalyst operation Short cycle and other technical issues

Method used

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  • Process for preparing ethylbenzene by ethylene-containing dry gas liquid phase method
  • Process for preparing ethylbenzene by ethylene-containing dry gas liquid phase method
  • Process for preparing ethylbenzene by ethylene-containing dry gas liquid phase method

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A 120,000-ton / year catalytic dry gas-liquid phase ethylbenzene production unit, using figure 1 process.

[0061] in:

[0062] The theoretical plate of the absorption tower has 15 layers, the absorption pressure is 0.9MPag, and the absorption temperature is 15℃;

[0063] The ethylene desorption tower has 15 theoretical plates, the desorption tower pressure is 1.2MPag, and the top temperature is 29℃;

[0064] The ethylene absorption tower adopts a packed tower, the absorption pressure is 0.85MPag, and the absorption temperature is 15℃;

[0065] The total benzene / total ethylene molar ratio of the alkylation reaction unit feed is 3.2:1;

[0066] Alkylation reactor: set up one alkylation reactor, the reaction temperature is 205℃, and the pressure is 4.3MPag;

[0067] Mixer supplementary absorption liquid flow: 20t / h;

[0068] The outlet pressure of the hydraulic turbine is 0.55MPag;

[0069] The deethanizer adopts 8 theoretical trays, the top pressure is 0.52MPag, and ...

Embodiment 2

[0079] A 400,000 ton / year catalytic dry gas-liquid phase ethylbenzene production unit, using image 3 process.

[0080] in:

[0081] The theoretical plate of the absorption tower has 20 layers, the absorption pressure is 0.85MPag, and the absorption temperature is 15℃;

[0082] The ethylene desorption tower has 20 theoretical plates, the desorption tower pressure is 1.2MPag, and the top temperature is 28℃;

[0083] The ethylene absorption tower adopts a packed tower, the absorption pressure is 0.82MPag, and the absorption temperature is 40℃;

[0084] The total benzene / total ethylene molar ratio of the alkylation reaction unit feed is 2:1;

[0085] The alkylation reactor is equipped with 3 parallel feeding reactors, the reaction inlet temperature is 205°C, and the pressure is 4.3MPag;

[0086] The outlet pressure of the hydraulic turbine is 0.55MPag;

[0087] The deethanizer adopts 8 theoretical trays, the pressure at the top of the tower is 0.52MPag, and the temperature a...

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Abstract

The invention discloses a process for preparing ethylbenzene by using an ethylene-containing dry gas liquid phase method in the technical field of petrochemical engineering, which comprises the following steps: washing an ethylene-containing dry gas raw material from the upstream, dehydrating by a dryer, then entering an absorption tower of a propylene removal unit to be in countercurrent contact with an absorbent, and enabling the ethylene-containing dry gas from the top of the absorption tower to enter an alkylation reaction unit; and the raw material benzene subjected to impurity removal by the fresh benzene treatment unit is sent to a mixer of the alkylation reaction unit. Part of the alkylation reaction product is returned to the ethylene absorption tower as lean cycle absorption liquid of the ethylene absorption tower, and part is sent to a subsequent product separation unit. According to the present invention, the liquid phase alkylation reaction is adopted to produce ethylbenzene, such that the direct contact between the gas phase ethylene and the catalyst is avoided, and the coking and the inactivation of the catalyst are delayed;

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a process for producing ethylbenzene by a dry gas-liquid phase method containing ethylene. [0002] technical background [0003] Ethylbenzene is the raw material for the production of styrene, which is mainly produced by dehydrogenation. The production technical routes of ethylbenzene mainly include liquid phase method and gas phase method. The liquid phase method usually adopts the pure ethylene route, and the gas phase method usually adopts the dilute ethylene dry gas method. The source of ethylbenzene raw materials is related to the economic benefits and development of the enterprise. It is beneficial to make full use of the refinery's own ethylene-containing dry gas to produce ethylbenzene, which is beneficial to improve the economic benefits of the enterprise and promote the rapid development of the ethylbenzene-styrene industry. . [0004] Refinery catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/66C07C7/00C07C7/04C07C15/073
CPCC07C2/66C07C7/04C07C7/005C07C15/073
Inventor 李网章毛存彪练弢蒋波李春晓张仲利要洁韩卫国成慧禹焦伟州
Owner SINOPEC GUANGZHOU ENG
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