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Refinery dry gas treatment method

A refinery dry gas and treatment method technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as waste of resources, and achieve the effect of avoiding direct combustion

Inactive Publication Date: 2019-05-07
刘洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the light hydrocarbons and hydrogen in the refinery dry gas have high utilization value, they are usually sent to the gas pipeline network as fuel gas, and some are even put into the flare to burn, resulting in a great waste of resources

Method used

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  • Refinery dry gas treatment method

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Embodiment Construction

[0012] The present invention is further described below in conjunction with accompanying drawing:

[0013] Such as figure 1 A treatment method for refinery dry gas is shown, including the following steps: (1), the refinery dry gas is subjected to amine washing and alkali washing to separate H2S and CO2; (2), the gas after amine washing and alkali washing is processed Drying and purification to separate H2O and AS; (3), the gas obtained after drying and purification is sent to the absorption tower for treatment; (4), the gas treated by the absorption tower is sent to the desorption tower to separate C3+; (5), the desorption tower is separated The output gas is sent to the crude separation tower to separate C2H4 and C2H6; the dry gas of the refinery is compressed for one stage and then subjected to amine washing and alkali washing; The gas is cooled and sent to the absorption tower; the liquid separated from the absorption tower is sent to the expander for processing and then s...

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Abstract

The invention discloses a refinery dry gas treatment method, and belongs to the field of refinery dry gas treatment. The refinery dry gas treatment method comprises that (1) refinery dry gas is subjected to amine washing and alkali washing to separate H2S and CO2; (2) the washed gas is subjected to drying purification to separate H2O and AS; (3) the gas obtained in the step (2) is conveyed into anabsorption tower, and is treated; (4) the treated gas is conveyed into a desorption tower to separate C3+; and (5) the gas separated by the desorption tower is conveyed into a coarse separation towerto separate C2H4 and C2H6, wherein the refinery dry gas is subjected to amine washing and alkali washing after compression. According to the pre sent invention, the refinery dry gas is sequentially subjected to amine washing and alkali washing and drying purification, the purified gas is conveyed into the absorption tower, and the obtained material is sequentially conveyed into the desorption tower and the coarse separation tower to separate C2H4 and C2H6, such that ethylene can be obtained, and the waste of resources due to the direct combustion of the refinery dry gas can be avoided; and the method can be used in the treatment of refinery dry gas.

Description

technical field [0001] The invention relates to a waste gas treatment method, in particular to a refinery dry gas treatment method. Background technique [0002] Refinery dry gas refers to the non-condensable gas (also called distilled gas) produced and recovered during the refining process of the refinery. The main components are ethylene, propylene and methane, ethane, propane, butane, etc., which are mainly used as fuel and chemical raw materials . Refinery dry gas mainly comes from the secondary processing of crude oil, such as heavy oil catalytic cracking, thermal cracking, delayed coking, etc. Among them, catalytic cracking (FCC) produces a large amount of dry gas, generally accounting for 4% to 5% of crude oil processing volume. The main components of FCC dry gas are hydrogen (25% to 40%) and ethylene (10% to 20%), and the main components of delayed coking dry gas are methane and ethane. Although light hydrocarbons and hydrogen in refinery dry gas have high utilizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/52B01D53/78
Inventor 刘洋
Owner 刘洋
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