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

A refining method and raw gas technology, applied in the direction of liquid carbon-containing fuel, chemical instruments and methods, fuel, etc., can solve the problems of waste of resources, discontinuity, high investment, etc., and achieve the effect of increasing production and simple process

Inactive Publication Date: 2010-03-03
CHINA PETROCHEMICAL CORP +1
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  • Abstract
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  • Claims
  • Application Information

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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.

Method used

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

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Embodiment Construction

[0039] A specific embodiment of the present invention is as figure 1 As shown, the ethylene-containing raw material gas 1 and the dilute ethylene gas 8 returned by the catalytic cracking or catalytic cracking unit enter from the lower end of the absorption device 2 respectively, and the desorbed absorbent 5 is mixed with the supplementary absorbent 11 and enters from the upper end of the absorption device 2. Under the condition that the temperature is -20°C-40°C, the pressure is 0.1-5.0MpaG, and the volume ratio of the absorbent to the total amount of raw gas is 0.001-1, most of the propylene in the raw gas is removed, and the purification after absorption by the absorbent The raw material gas 7 enters the reaction part of the ethylbenzene plant; the saturated absorbent 3 enters the middle section of the desorption device 4 for desorption, the pressure is 0.001-4.0MPaG, the temperature is 10-300°C, and the absorbent 5 after desorption at the bottom of the tower is mixed with th...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C7/11C07C15/073C07C2/64C10L3/12C10L1/04
Inventor 董世达李淑红张仲利李建保
Owner CHINA PETROCHEMICAL CORP
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