Configurations and methods for acid gas absorption and...

B - Operations – Transporting – 01 – D

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B01D 53/96 (2006.01) B01D 53/14 (2006.01)

Patent

CA 2605649

Contemplated configurations and methods include a solvent regenerator (58) that has an upper (93) and d a lower stripping section (94). Cooled rich solve is used as reflux while heated rich solvent (11) is used as a source of stripping agent in the upper section (91). A reboiler (62) in the lower section provides further stripping agent, hi especially preferred configurations, a portion of lean solved from the regenerator (58) is further stripped in a separate or integrated regenerator (62) to form an ultra-lean solvent. Both lean and ultra-lean solvents are preferably used in a two-stage absorber (52) to thereby from the rich solvent and an offgas that is very low in acid gas.

L'invention concerne des dispositifs et des procédés portant notamment sur un régénérateur de solvants qui a une section de rectification supérieure et inférieure. On utilise un solvant riche refroidi comme reflux et un solvant riche chauffé comme source d'agent de rectification dans la section supérieure. Un rebouilleur dans la section inférieure fournit un autre agent de rectification. Dans des dispositifs particulièrement préférés, une partie de solvant léger prélevé du régénérateur est également rectifié dans un régénérateur séparé ou intégré afin de former un solvant ultra-léger. Les deux solvants léger et ultra-léger sont de préférence utilisés dans un absorbeur à deux étages pour former le solvant riche et un gaz dégagé qui est très pauvre en gaz acides.

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