US 12,435,285 B2
Process and plant for removing carbon dioxide and water from synthesis gas
Sophia Schmidt, Frankfurt am Main (DE); and Matthias Linicus, Eppstein (DE)
Assigned to L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude, Paris (FR)
Filed by L'Air Liquide, Société Anonyme pour I'Etude et I'Exploitation des Procédés Georges Claude, Paris (FR)
Filed on Mar. 17, 2023, as Appl. No. 18/122,905.
Claims priority of application No. 22162889 (EP), filed on Mar. 18, 2022.
Prior Publication US 2023/0295527 A1, Sep. 21, 2023
Int. Cl. C10K 1/08 (2006.01); B01D 53/14 (2006.01); B01D 53/26 (2006.01); C10K 1/00 (2006.01); C10K 1/04 (2006.01); C10K 1/26 (2006.01)
CPC C10K 1/085 (2013.01) [B01D 53/1406 (2013.01); B01D 53/1425 (2013.01); B01D 53/263 (2013.01); C10K 1/005 (2013.01); C10K 1/04 (2013.01); C10K 1/26 (2013.01); B01D 2256/16 (2013.01); B01D 2256/20 (2013.01); B01D 2257/504 (2013.01); B01D 2257/80 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A process for removing carbon dioxide and water from synthesis gas, wherein the synthesis gas comprises at least hydrogen, carbon dioxide and water, comprising the steps of:
(a) providing a physical absorption medium;
(b) supplying the synthesis gas to a scrubbing apparatus and removing water present in the synthesis gas in the scrubbing apparatus by scrubbing the synthesis gas with absorption medium supplied to the scrubbing apparatus to obtain a synthesis gas at least partially freed of water and a mixture of absorption medium and water, wherein the synthesis gas at least partially freed of water and the mixture of absorption medium and water are withdrawn from the scrubbing apparatus;
(c) supplying the mixture of absorption medium and water to a thermal separation apparatus and thermally separating the mixture in the separation apparatus into water and absorption medium, wherein the water is withdrawn from the thermal separation apparatus and wherein the absorption medium is withdrawn from the thermal separation apparatus and subsequently supplied to the scrubbing apparatus for removing the water present in the synthesis gas according to step (b);
(d) supplying the synthesis gas at least partially freed of water to an absorption apparatus and removing carbon dioxide from the synthesis gas by physical absorption of the carbon dioxide in the absorption medium at absorption pressure in the absorption apparatus, wherein the absorption medium and the synthesis gas are run in countercurrent in the absorption apparatus to obtain an absorption medium laden at least with carbon dioxide and a synthesis gas at least partially freed of carbon dioxide and water, wherein the absorption medium laden at least with carbon dioxide and the synthesis gas at least partially freed of carbon dioxide and water are withdrawn from the absorption apparatus;
(e) removing carbon dioxide from the laden absorption medium withdrawn from the absorption apparatus by desorption of the carbon dioxide in a regeneration apparatus by pressure reduction relative to the absorption pressure, wherein desorbed carbon dioxide and at least partially regenerated absorption medium are withdrawn from the regeneration apparatus and wherein the at least partially regenerated absorption medium is recycled to the absorption apparatus for use as absorption medium according to step (d).