US 11,718,796 B2
Process and plant for separation of concomitants from a raw synthesis gas stream and for producing a sulfur-free by-product
Sophia Schmidt, Frankfurt (DE); and Sharon Corbet, Frankfurt (DE)
Assigned to L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, Paris (FR)
Filed by L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, Paris (FR)
Filed on Aug. 27, 2020, as Appl. No. 17/4,745.
Claims priority of application No. 19020517 (EP), filed on Sep. 6, 2019.
Prior Publication US 2021/0071090 A1, Mar. 11, 2021
Int. Cl. C10G 5/04 (2006.01); C10G 31/08 (2006.01); C10G 33/00 (2006.01); B01D 53/14 (2006.01); C10K 1/00 (2006.01); C10K 1/08 (2006.01)
CPC C10G 5/04 (2013.01) [B01D 53/1406 (2013.01); B01D 53/1418 (2013.01); B01D 53/1425 (2013.01); B01D 53/1487 (2013.01); C10G 31/08 (2013.01); C10G 33/00 (2013.01); C10K 1/004 (2013.01); C10K 1/005 (2013.01); C10K 1/08 (2013.01); B01D 2252/2021 (2013.01); B01D 2257/302 (2013.01); B01D 2257/304 (2013.01); B01D 2257/306 (2013.01); B01D 2257/308 (2013.01); B01D 2257/504 (2013.01); B01D 2257/702 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A process for staged separation of concomitants from a raw synthesis gas stream to produce synthesis gas by absorption of the concomitants in a physical scrubbing medium operated countercurrent to the raw synthesis gas stream in a plurality of scrubbing stages at elevated pressure, wherein the concomitants comprise at least carbon dioxide, one or more sulfur compounds of a first type, one or more sulfur compounds of a second type and naphtha, the process comprising:
a) absorbing at least naphtha and sulfur compounds of the first type from a raw synthesis gas stream in a prescrubbing stage thereby producing a scrubbing medium fraction laden at least with naphtha and sulfur compounds of the first type;
b) mixing the laden scrubbing medium fraction obtained in step a) with water to effect a phase separation into two liquid phases, wherein a first liquid phase comprises water and scrubbing medium and a second liquid phase comprises naphtha and sulfur compounds of the first type dissolved therein;
c) heating the second liquid phase obtained in step b) to remove the sulfur compounds of the first type and obtain sulfur-free naphtha;
d) absorbing carbon dioxide and sulfur compounds of the second type from the first liquid phase obtained in step b) in at least one main scrubbing stage arranged downstream of the prescrubbing stage in the gas flow direction to obtain at least one scrubbing medium fraction laden with at least carbon dioxide or sulfur compounds of the second type;
e) regenerating the laden scrubbing medium fraction obtained in step d) and reusing the regenerated scrubbing medium for absorbing concomitants in steps a) and d).