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Process flow for raw material pretreatment portion of catalytic dry gas produced phenylethane

A process flow and pretreatment technology, which is applied in the processing of hydrocarbon oil, gas mixture, petroleum industry, etc., can solve the problems of affecting the purity of ethylbenzene products and increasing the consumption of benzene, so as to save absorbent and be beneficial to absorption. Effect

Active Publication Date: 2007-03-07
中国寰球工程有限公司辽宁分公司
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Problems solved by technology

[0005] Catalytic cracking dry gas is used as the raw material of dry gas to produce ethylbenzene, and the concentration of propylene is usually about 3%. During the alkylation reaction of ethylene and benzene, accompanied by the side reaction of propylene and benzene, the formation of by-product propylbenzene not only affects the production of ethylbenzene purity, and increased benzene consumption

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  • Process flow for raw material pretreatment portion of catalytic dry gas produced phenylethane

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Embodiment Construction

[0025] The equipment in the present invention is all the equipment used in the existing technology, and can be ordered or purchased. In the present invention, the dosage of the benzene absorbent varies according to the size of the equipment, but it is sufficient to ensure that the volume ratio of the absorbent to the dry gas is 2-30.

[0026] Catalytic dry gas at 0.6-1.0MPa and 40°C enters the washing tower 1 from the system for washing, and the washing water is recycled as fresh water (with replenishment), most of the MDEA in the dry gas is removed, and the concentration of MDEA in the dry gas after washing is reduced to below 1PPM . The washed dry gas enters the dry gas liquid separation tank 2 and mixes with the circulating dry gas at the top of the deethylene tower 5, then is compressed by the dry gas compressor and then enters the propylene absorption tower 4 at 1.2-1.4 MPa and 40°C. The dry gas purified at the top of the tower enters the alkylation reactor after exchang...

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Abstract

The invention discloses a predisposing technological flow path of ethylbenzene through catalyzing dried gas, which comprises the following steps: adsorbing propylene; desorbing ethylene; desorbing propylene; adding raw material to strip propylene; washing most of MEDA; entering standard dried gas in the delivery tank; entering into propylene adsorbing tower; draining purified dried gas from top of propylene adsorbing tower; making one path as cool material in the ethylene stripping tower and one path to exchange heat with base material of propylene stripping tower under 10-300 deg.c in the ethylene stripping tower; desorbing ethylene component; draining ethylene gas; returning in the dried gas delivery tank; circulating between ethylene stripping tower and propylene stripping tower; desorbing propylene component from adsorbant with 150ppm-0.7% dried propylene in the stripped propylene.

Description

Technical field: [0001] The invention relates to the technical field of refinery gas recovery in petrochemical industry, specifically, it is an absorption and desorption process flow---a process flow of the raw material pretreatment part of catalytic dry gas production of ethylbenzene. Background technique: [0002] Refinery gas is the gas produced by various process units in the petroleum processing process (including hydrogen and C 1 to C 4 Alkanes, alkenes and a small amount of C 5 ) collectively. The equipment for generating refinery gas mainly includes thermal processing processes such as initial distillation of crude oil, catalytic cracking, hydrocracking, coking, and visbreaking. In the industry, absorption and desorption methods are generally used to remove more than C in the gas 3 and less than C 2 The components are separated and recovered, which is the absorption and desorption process used in general refineries. [0003] There are currently two types of abs...

Claims

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Application Information

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IPC IPC(8): C10G70/04
Inventor 金月昶曾蓬房晶付会娟金熙俊康久常
Owner 中国寰球工程有限公司辽宁分公司
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