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Refining method of virgin gas containing ethane used in process for preparing ethylbenzene by ethane

A refining method and raw gas technology, applied in ethylene production, chemical instruments and methods, petroleum industry, etc., can solve the problems of discontinuity, waste of pretreatment resources, etc., achieve simple process, low ethylene loss rate, and improved ethylene yield Effect

Active Publication Date: 2010-03-10
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

[0005] The present invention aims at the disadvantages of resource waste and discontinuity in the pretreatment of ethylene-containing raw material gas in the prior art, and provides a refining method for ethylene-containing raw material gas in the process of producing ethylbenzene from ethylene. The process is a continuous operation process , after refining the raw material gas with this process, the loss rate of ethylene in the refined gas is less than 2%, and the removal rate of propylene is 95-99.9%

Method used

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  • Refining method of virgin gas containing ethane used in process for preparing ethylbenzene by ethane
  • Refining method of virgin gas containing ethane used in process for preparing ethylbenzene by ethane
  • Refining method of virgin gas containing ethane used in process for preparing ethylbenzene by ethane

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Embodiment Construction

[0034] A specific embodiment of the present invention is as figure 1 As shown, the ethylene-containing feed gas 1 enters from the middle of the absorption tower 2, and the desorbed absorbent 5 enters from the upper part of the absorption tower 2, and the ethylene-containing feed gas 1 and the desorbed absorbent 5 are countercurrently contacted, and the operation of the absorption tower 2 The temperature is -20-300°C, the pressure is 0.1-5.0MPaG, and the ethylene-containing raw material gas 7 absorbed by the absorbent enters the reaction part of the ethylbenzene device; the bottom of the absorption tower 2 is equipped with a reboiler 14, and the saturated absorbent 3 Enter the middle section of the desorption tower 4 for desorption, the pressure is 0.001-4.0MPaG, the temperature is 10-300°C, the absorbent 5 desorbed at the bottom of the tower is returned to the absorption tower 2 for recycling, and supplementary absorbent 8 is added according to the consumption of the absorbent....

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Abstract

The invention discloses a desorption method of propylene in virgin gas containing ethylene used in a process for preparing ethylbenzene by dilute ethylene, comprising the following steps: virgin gas containing ethylene enters an absorption tower from the middle and is in countercurrent contact absorbent entering the absorption tower from the upper part; the refined virgin gas absorbed by the absorbent enters in a reaction part of an ethylbenzene unit to react with benzene to obtain ethylbenzene; saturable absorbent is used for desorption by adopting a low-pressure thermal desorption; and the desorbed absorbent is circularly used. By the process, after the virgin gas containing ethylene is refined, the loss ratio of the refined ethylene gas is smaller than 2 percent, and the removal percent of propylene is 95-99.9 percent.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method for refining ethylene-containing raw material gas used in the process of preparing ethylbenzene by reacting ethylene and benzene. Background technique [0002] Ethylbenzene is an important chemical raw material. Since the end of the 1930s, a variety of methods for producing ethylbenzene using ethylene and benzene as raw materials have been developed, but most of these methods use ethylene volume content greater than 99% polymer grade ethylene as raw material. With the development of petroleum processing scale, refinery tail gas containing low-concentration ethylene is increasing day by day. For the utilization of ethylene in these tail gases, several kinds of low-concentration ethylene gas have been developed to react with benzene since the end of the 1950s. Preparation of ethylbenzene method. U.S. Patent US2,939,890, US3,691,245, US3,702,886 and Briti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C7/11C07C15/073C07C2/64C10G70/06
CPCY02P30/40
Inventor 董世达李淑红张仲利李建保
Owner CHINA PETROCHEMICAL CORP
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