US 12,110,460 B2
Method and apparatus for recovering C2—C4 components in methane-containing industrial gas
Huawei Shao, Beijing (CN); Dongfeng Li, Beijing (CN); Yi Zou, Beijing (CN); Zhixin Liu, Beijing (CN); Chunfang Li, Beijing (CN); Liang Guo, Beijing (CN); Jingsheng Zhang, Beijing (CN); and Zhiyan Hu, Beijing (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN)
Appl. No. 17/755,418
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN)
PCT Filed Sep. 24, 2020, PCT No. PCT/CN2020/117451
§ 371(c)(1), (2) Date Apr. 28, 2022,
PCT Pub. No. WO2021/082825, PCT Pub. Date May 6, 2021.
Claims priority of application No. 201911030061.1 (CN), filed on Oct. 28, 2019; and application No. 201911032377.4 (CN), filed on Oct. 28, 2019.
Prior Publication US 2022/0389337 A1, Dec. 8, 2022
Int. Cl. C10L 3/00 (2006.01); B01D 53/00 (2006.01); B01D 53/14 (2006.01); B01D 53/18 (2006.01); C10G 5/04 (2006.01); C10G 5/06 (2006.01); C10G 70/04 (2006.01); C10G 70/06 (2006.01); C10L 3/10 (2006.01); F25J 3/06 (2006.01)
CPC C10G 70/06 (2013.01) [B01D 53/002 (2013.01); B01D 53/1406 (2013.01); B01D 53/1418 (2013.01); B01D 53/1425 (2013.01); B01D 53/1431 (2013.01); B01D 53/1487 (2013.01); B01D 53/18 (2013.01); C10G 5/04 (2013.01); C10G 5/06 (2013.01); C10G 70/046 (2013.01); F25J 3/064 (2013.01); B01D 2252/205 (2013.01); F25J 2205/04 (2013.01); F25J 2205/50 (2013.01); F25J 2210/04 (2013.01); F25J 2230/30 (2013.01)] 27 Claims
OG exemplary drawing
 
1. Method for recovering C2 components in a methane-containing industrial gas, the method comprising the following steps:
(1) compressing the methane-containing industrial gas, cooling the obtained compressed gas prior to performing gas-liquid separation, to obtain a gas phase and a liquid phase;
(2) contacting the gas phase with an absorbent to absorb the C2 components to obtain an absorption tail gas and an absorption rich liquid, wherein,
the absorption rich liquid is returned and mixed into the compressed gas, or
a mixed liquid of the absorption rich liquid and the liquid phase obtained in step (1) or the absorption rich liquid is used as a first stream;
(3) depressurizing the liquid phase obtained in step (1) or the first stream obtained in step (2);
(4) subjecting the depressurized stream in step (3) to methane desorption to obtain a desorbed gas and a rich absorbent, and returning the desorbed gas to the compression in step (1) or discharging it externally, or
subjecting the depressurized stream in step (3) to a second gas-liquid separation to obtain a second gas phase and a second liquid phase, returning the second gas phase to the compression in step (1), subjecting the second liquid phase to methane desorption to obtain a desorbed gas and a rich absorbent, and returning the desorbed gas to the compression in step (1) or discharging it externally;
(5) subjecting the rich absorbent to desorption separation to obtain a lean absorbent and an enriched gas containing the C2 components, the lean absorbent being returned and mixed into the absorbent in step (2).