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COSWEET™ deep COS removal from natural gas

By combining amine absorption with catalytic COS hydrolysis, COSWEET™ allows gas sweetening, either total (removal of both H₂S + CO₂) or selective (removal of H₂S mainly), with complete COS removal. The three steps of COSWEET™ process consists in:
* Removing the bulk of the H₂S and CO₂ present in the feed gas by absorption in the bottom section of a solvent absorber.
* Withdrawing the partially sweetened gas from bottom section of the absorber, water washing, heating to mild temperature and sending it to a hydrolysis reactor, where COS is converted to H₂S and CO₂.
* Cooling the hydrolyzed gas  and removing the H₂S (and if needed also the CO₂) by absorption in the top part of the amine absorber, down to the required specification

COSWEET™ is applicable with any type of absorption solvent:
* With solvents such as formulated amine which already achieve COS removal, COSWEET™ will allow deeper COS removal without any increase of the solvent flow in the absorber.
* With selective solvents, such as MDEA which scarcely removes COS, COSWEET™ achieves deep COS removal while keeping the benefits of selective H₂S removal: reduced solvent flow, higher concentration of H₂S in the acid gas.

COSWEET™ allows CAPEX and OPEX savings of around 15 % or more compared to other options when deep COS removal is required. Those savings figures do not include the additional savings on the dowstream SRU, linked to the fact that by using a selective amine COSWEET™ will produce a better quality acid gas to be fed to the SRU.

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