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Process for producing paraxylene and ethylbenzene from mixed C8 aromatic hydrocarbons

A technology of p-xylene and ortho-xylene, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve the problems of energy consumption and large energy, and achieve the reduction of device material consumption, optimization of conditions, The effect of reducing the energy consumption of the device

Active Publication Date: 2021-07-09
SINOPEC ENG +1
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Problems solved by technology

Gas-phase pressure swing adsorption needs to vaporize the components, which requires a lot of energy; the method of combining adsorption and crystallization also consumes energy in crystallization

Method used

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  • Process for producing paraxylene and ethylbenzene from mixed C8 aromatic hydrocarbons
  • Process for producing paraxylene and ethylbenzene from mixed C8 aromatic hydrocarbons
  • Process for producing paraxylene and ethylbenzene from mixed C8 aromatic hydrocarbons

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Embodiment 1

[0097] This example provides a method for producing p-xylene and ethylbenzene from mixed C8 aromatics. See figure 2 , the method includes the following steps:

[0098] Mixed C8 aromatics X are used as raw materials, and the first simulated moving bed separation device 1 is used to carry out the first liquid-phase adsorption separation of mixed C8 aromatics X. The adsorption temperature is 156 ° C, and the adsorption pressure is 0.75 MPaG. An extract 3a, and a first raffinate 3b rich in ethylbenzene.

[0099] Utilize the first rectification device 2 to carry out the first rectification to the first extraction liquid 3a, the temperature of the first rectification tower top is 190, the pressure is 0.25PaG, obtains p-xylene product 5a, wherein the mass concentration of p-xylene is greater than or equal to 99.7% and less than 100%, and the first extracted liquid residual liquid 5b, the first extracted liquid residual liquid 5b is circulated back to the first simulated moving bed...

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Abstract

The invention belongs to the technical field of aromatic hydrocarbon production, and relates to a method for producing p-xylene and ethylbenzene from mixed C8 aromatic hydrocarbons. The method comprises the following steps: carrying out first liquid phase adsorption separation on mixed C8 aromatic hydrocarbons to obtain a first extract rich in p-xylene and a first raffinate rich in ethylbenzene; rectifying the first extract to obtain a p-xylene product and a first extract residual liquid; rectifying the first raffinate to obtain a mixture containing ethylbenzene, o-xylene and m-xylene and a first raffinate residual liquid; carrying out second liquid phase adsorption separation on the mixture to obtain a second extract rich in ethylbenzene and a second raffinate poor in ethylbenzene; rectifying the second extract to obtain an ethylbenzene product and residual liquid of the second extract; and rectifying the second raffinate to obtain a mixture rich in o-xylene and m-xylene and a second raffinate residual liquid. According to the method, the energy consumption for separating p-xylene and ethylbenzene from C8 aromatic hydrocarbons is reduced.

Description

technical field [0001] The invention belongs to the technical field of aromatics production, and more specifically relates to a method for producing p-xylene and ethylbenzene from mixed C8 aromatics. Background technique [0002] Both p-xylene and ethylbenzene are important basic organic chemical raw materials and have broad market application prospects. Ethylbenzene is mainly used in the production of styrene. [0003] The production of high-purity p-xylene by means of adsorption separation is well known to those skilled in the art. There are two methods to produce high-purity ethylbenzene, one is to generate ethylbenzene through reaction. The other is to obtain ethylbenzene through separation method in C8 aromatic hydrocarbons. [0004] For the method for generating ethylbenzene by reaction, patent document CN108698952A discloses a method for producing ethylbenzene. The process comprises: (a1) providing benzene and an alkylating agent comprising at least 40 wt% ethylen...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C7/12C07C7/163C07C15/073C07C15/08
CPCC07C7/12C07C7/04C07C7/00C07C7/163C07C15/08C07C15/073
Inventor 王婷姜晓花廖斯达刘永芳
Owner SINOPEC ENG
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