US 12,076,690 B2
Process and plant for purifying crude synthesis gas
Alfred Gubrinski, Frankfurt am Main (DE); Sharon Corbet, Frankfurt (DE); Dorit Rappold, Frankfurt (DE); and Pankaj Puri, Crakow (PL)
Assigned to L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude, Paris (FR)
Appl. No. 17/253,358
Filed by L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, Paris (FR)
PCT Filed May 29, 2019, PCT No. PCT/EP2019/025159
§ 371(c)(1), (2) Date Dec. 17, 2020,
PCT Pub. No. WO2019/242883, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 18400026 (EP), filed on Jun. 18, 2018.
Prior Publication US 2021/0260521 A1, Aug. 26, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 53/02 (2006.01); B01D 53/14 (2006.01); B01D 53/18 (2006.01); C10K 1/00 (2006.01); C10K 1/14 (2006.01)
CPC B01D 53/1462 (2013.01) [B01D 53/1406 (2013.01); B01D 53/1425 (2013.01); B01D 53/1468 (2013.01); B01D 53/1475 (2013.01); B01D 53/18 (2013.01); C10K 1/004 (2013.01); C10K 1/005 (2013.01); C10K 1/006 (2013.01); C10K 1/14 (2013.01); B01D 2252/2021 (2013.01); B01D 2256/16 (2013.01); B01D 2256/20 (2013.01); B01D 2257/304 (2013.01); B01D 2257/306 (2013.01); B01D 2257/406 (2013.01); B01D 2257/408 (2013.01); B01D 2257/504 (2013.01); B01D 2257/7027 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A process for purifying a crude synthesis gas by gas scrubbing with a scrubbing medium comprising:
(a) providing and supplying the crude synthesis gas to a prescrubber for removal of trace components,
(b) supplying a gaseous tops product from the prescrubber to an H2S scrubber for removal of H2S,
(c) supplying a gaseous tops product from the H2S scrubber to a CO2 scrubber for removal of CO2,
(d) discharging a purified synthesis gas stream as a gaseous tops product from the CO2 scrubber,
(e) supplying a liquid bottoms product from the prescrubber to an intermediate-pressure prescrubbing flash vessel, supplying a gaseous tops product from the intermediate-pressure prescrubbing flash vessel to a recompressor, supplying a liquid bottoms product from the intermediate-pressure prescrubbing flash vessel to a low-pressure prescrubbing flash vessel, supplying a gaseous tops product from the low-pressure prescrubbing flash vessel to the recompressor, supplying a liquid bottoms product from the low-pressure prescrubbing flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium,
(f) supplying a liquid bottoms product from the H2S scrubber to an intermediate-pressure H2S flash vessel, supplying a gaseous tops product from the intermediate-pressure H2S flash vessel to the recompressor, supplying a liquid bottoms product from the intermediate-pressure H2S flash vessel to a low-pressure H2S flash vessel, supplying a gaseous tops product from the low-pressure H2S flash vessel to the recompressor, supplying a liquid bottoms product from the low-pressure H2S flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium,
(g) supplying a liquid bottoms product from the CO2 scrubber to an intermediate-pressure CO2 flash vessel, supplying a gaseous tops product from the intermediate-pressure CO2 flash vessel to the recompressor, supplying a liquid bottoms product from the intermediate-pressure CO2 flash vessel to a low-pressure CO2 flash vessel, supplying a gaseous tops product from the low-pressure CO2 flash vessel to the low-pressure H2S flash vessel and/or to the recompressor, supplying a liquid bottoms product from the low-pressure CO2 flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium,
(h) recycling the gas stream compressed by the recompressor to the prescrubber for the crude synthesis gas.