Refining method of virgin gas containing ethane used in process for preparing ethylbenzene by ethane
A refining method and technology for raw gas, which are applied in chemical instruments and methods, petroleum industry, processing of gas mixtures, etc., can solve problems such as large environmental impact, and achieve the effects of easy treatment and small sewage discharge.
Active Publication Date: 2013-01-02
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology
CN1292824C discloses that the catalytic cracking dry gas directly enters the absorption tower with a temperature of -10-40°C, and CN1923973A discloses that the catalytic dry gas is first washed with fresh water and separated, and then enters the absorption tower to contact with the absorbent at -10-40°C countercurrently. This causes the ethylene-containing feed gas containing 40°C saturated water to directly contact with substances not higher than 40°C. Due to the drop in temperature, the saturated water will be freed, and this part of water will be mixed with the absorbent and will leave in the form of oily sewage system, which has a large impact on the environment
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[0021] Such as figure 1 As shown, the ethylene-containing raw material gas 1 enters the cooling device 2, and the temperature t after cooling is 0 ° C < t < 40 ° C. The cooled ethylene-containing raw material gas 3 enters the liquid separation device 4 for liquid separation, and the liquid separation device 4 separates the sewage 5 and the ethylene-containing raw material gas 6 after the liquid separation, the ethylene-containing raw material gas 6 after the liquid separation enters the absorption device 10, contacts with the absorbent 8 for refining, and the ethylene-containing raw material gas 7 absorbed by the absorbent enters ethylene to produce ethylbenzene Process device, saturated absorbent 9 out of the device. The temperature of the ethylene-containing raw material gas 3 after cooling is controlled not to be higher than the temperature of the absorbent 8, and the temperature difference is 0-30°C.
[0022] Such as figure 2 shown, which is the same as figure 1 The di...
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The invention discloses a refining method of virgin gas containing ethane used in a process for preparing ethylbenzene by ethane. The invention has the technical scheme as follows: virgin gas containing ethane enters in a cooling device for cooling to reach the temperature t which is larger than 0 DEG C and smaller than 40 DEG C, then the virgin gas enters in a liquid separating device, generatedsewage is discharged from the liquid separating device, and the virgin gas containing ethane and subjected to liquid separation enters in an absorption device and contacts absorbent for refining to obtain the refined virgin gas containing ethane. The process can ensure that free water contained in the virgin gas containing ethane can be discharged before the virgin gas containing ethane is absorbed at low temperature in the process for preparing ethylbenzene by ethane, thereby reducing the influence on the environment.
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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IPC IPC(8): C07C11/04C07C7/09C07C7/11C10G70/04C07C15/073C07C2/64
Inventor 董世达李淑红张仲利李建保
Owner CHINA PETROCHEMICAL CORP