Method and device for separating hydrogen and ethylene from refinery dry gas by shallow condensing adsorption-absorption

A refinery dry gas, shallow cold absorption technology, applied in hydrogen separation, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve the problems of low product purity, high energy consumption, etc., to reduce energy consumption, save refrigeration amount, the effect of reducing investment
CN104031682AActive Publication Date: 2014-09-10SICHUAN TECHAIRS
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN TECHAIRS
Publication Date
2014-09-10

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Abstract

The invention relates to a method for separating and extracting hydrogen and ethylene from refinery dry gas by shallow condensing adsorption-absorption. The method comprises the steps of: S1, carrying out adsorption for the first time on pretreated refinery dry gas of which the pressure is 0.5MPa; S2, pressurizing ethylene-enriched dry gas in the step S1 to 1-2MPa and carrying out shallow condensing absorption; and S3, enabling absorbing liquid obtained by shallow condensing absorption in the step S2 to be subjected to desorption. The invention also discloses a device for separating hydrogen and ethylene from refinery dry gas by shallow condensing adsorption-absorption. The device comprises a first adsorption tower, a second adsorption tower, a shallow condensing absorption tower, a desorber, an expander, a compressor and a pretreatment unit. According to the method and device disclosed by the invention, since C2 is separated and concentrated by virtue of carrying out shallow condensing absorption and low pressure adsorption absorption prior to the shallow condensing absorption, non-condensable gases, such as hydrogen are prevented from entering into the shallow condensing absorption unit, and thus the operating load and energy consumption of absorption are reduced and the investment of cost is decreased.
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Description

Technical field

[0001] The invention relates to the field of classification and recovery of dry gas in a refinery, and relates to a method and a device for extracting hydrogen and ethylene by shallow cooling adsorption-absorption and separation of dry gas in a refinery. Background technique

[0002] The useful components in refinery dry gas are mainly hydrogen, light olefins and light alkanes. These components are very valuable in the dry gas of the refinery, but at present, a large amount of them are still not optimally utilized. Instead, they are directly used as fuel, and some are even directly ignited and vented. Refinery dry gas contains both hydrogen and a large amount of light olefins and light alkanes. These components can be separated and used separately, which is more beneficial than using them directly as fuel or as raw materials for hydrogen production and methanol synthesis.

[0003] The technologies for recovering hydrogen, light olefins and light alkanes from dry g...

Claims

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