US 12,109,527 B2
Process and apparatus for the separation of two gaseous streams each containing carbon monoxide, hydrogen and at least one acid gas
Antoine Hernandez, Saint Maur des Fossés (FR); and Wei Guan, Shanghai (CN)
Assigned to L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude, Paris (FR)
Appl. No. 17/615,239
Filed by L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, Paris (FR)
PCT Filed May 30, 2019, PCT No. PCT/CN2019/089245
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2020/237563, PCT Pub. Date Dec. 3, 2020.
Prior Publication US 2022/0233994 A1, Jul. 28, 2022
Int. Cl. B01D 53/22 (2006.01); B01D 53/00 (2006.01); B01D 53/04 (2006.01); B01D 53/047 (2006.01); B01D 53/14 (2006.01); C01B 3/12 (2006.01); C01B 3/50 (2006.01); C01B 3/56 (2006.01)
CPC B01D 53/0462 (2013.01) [B01D 53/002 (2013.01); B01D 53/047 (2013.01); B01D 53/1475 (2013.01); C01B 3/12 (2013.01); C01B 3/506 (2013.01); C01B 3/56 (2013.01); B01D 2256/16 (2013.01); B01D 2256/20 (2013.01); B01D 2257/504 (2013.01); C01B 2203/0283 (2013.01); C01B 2203/042 (2013.01); C01B 2203/046 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process for separating two gaseous streams each containing at least one acid gas, carbon monoxide and hydrogen to remove carbon monoxide and hydrogen comprising:
i) purifying a first gaseous stream containing at least carbon monoxide, hydrogen and at least one acid gas in a first acid gas removal absorber to remove at least one acid gas, purifying in a first temperature swing adsorption unit to remove at least carbon dioxide and then separating at a cryogenic temperature in a separation unit to produce a stream of fluid enriched in carbon monoxide and a stream of fluid enriched in hydrogen,
ii) sending a second gaseous stream containing at least carbon monoxide, hydrogen and at least one acid gas to a shift reaction unit in which carbon monoxide and water vapor in the second stream are converted to carbon dioxide and hydrogen, the shifted second stream is purified in a second acid gas removal absorber to remove carbon dioxide and the purified second stream is sent as a feed to a pressure swing adsorption unit to produce a hydrogen enriched stream richer in hydrogen than the feed stream, and
iii) sending at least part of the stream enriched in hydrogen from the separation unit to the pressure swing adsorption unit to produce the hydrogen-enriched stream,
wherein a gas reduced in hydrogen is produced by the pressure swing adsorption unit and is sent to a second temperature swing adsorption unit where it is purified to remove carbon dioxide and the purified gas from the second temperature swing adsorption unit is sent as a feed gas to the separation unit.