Refining method of raw material gas containing ethene in process of preparing ethylbenzene from ethene

Abstract

The invention discloses a refining method of raw material gas containing ethene in the process of preparing ethylbenzene from ethene, comprising the steps: raw material gas containing ethene and dilute ethene gas returned by a catalytic cracking or splitting device are mixed or respectively enter from the lower part of an absorbing device, are contacted with an absorbent entering from the upper part of the absorbing device for refining, the refined raw material gas enters a reaction part of an ethylbenzene device to react with benzene to prepare the ethylbenzene, the saturated absorbent is desorbed and then recycled, and desorbed gas enters a catalytic cracking or catalytic splitting device. The method has simple flow, low investment and favorable refining effect, and ensures that the unreacted rate of propylene is as high as 98.1-99.9 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...

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Problems solved by technology

[0006] The present invention aims at the disadvantages of complex pretreatment process, high investment, waste of resources, discontinuity and the like in the prior art process for ethylene-containing raw material gas, 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 with simple flow and low investment. This process can not only refine the raw material gas, but also make full use of the resources contained in the raw material gas without wasting resources.

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