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Title:
METHOD AND DEVICE FOR RECOVERING C2-C4 COMPONENTS IN METHANE-CONTAINING INDUSTRIAL GAS
Document Type and Number:
WIPO Patent Application WO/2021/082825
Kind Code:
A1
Abstract:
Disclosed are a method and a device for recovering C2 components in methane-containing gas. The method comprises the following steps: (1) cooling a compressed methane-containing gas and performing gas-liquid separation; (2) absorbing C2 components by using an absorbent for gas to obtain a rich absorbing liquid; (3) refluxing the rich absorbing liquid to the compressed methane-containing gas or mixing the rich absorbing liquid with the liquid obtained in step (1) to obtain a mixture solution, and reducing the pressure on the mixture solultion or the rich absorbing liquid; (4) performing methane desorption on the pressure-reduced flow to obtain a rich absorbent, or performing secondary gas-liquid separation on the pressure-reduced flow, followed by methane desorption on the second liquid to obtain a rich absorbent; and (5) desorbing and separating the rich absorbent to obtain a lean absorbent and an enriched gas, and the lean absorbent is recycled and reused. The method has a high recovery rate of C2 (and above) components, as well as low overall energy consumption.

Inventors:
SHAO HUAWEI (CN)
LI DONGFENG (CN)
ZOU YI (CN)
LIU ZHIXIN (CN)
LI CHUNFANG (CN)
GUO LIANG (CN)
ZHANG JINGSHENG (CN)
HU ZHIYAN (CN)
Application Number:
PCT/CN2020/117451
Publication Date:
May 06, 2021
Filing Date:
September 24, 2020
Export Citation:
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Assignee:
CHINA PETROLEUM & CHEM CORP (CN)
BEIJING RES INST CHEMICAL IND CHINA PETROLEUM & CHEMICAL CORP (CN)
International Classes:
C10G70/06; C10G70/04; F25J3/02
Foreign References:
CN107560319A2018-01-09
CN106609161A2017-05-03
CN101638584A2010-02-03
CN105037069A2015-11-11
CN105441130A2016-03-30
US4740222A1988-04-26
US5202521A1993-04-13
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
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