Improved composition and method for removal of carbonyl...

B - Operations – Transporting – 01 – D

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B01D 53/14 (2006.01) B01D 53/48 (2006.01)

Patent

CA 2519763

Novel solvent composition for selective removal of COS from a gas stream containing same, said composition comprising a) at least one polyalkylene glycol alkyl ether of the formula (I) or 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)- pyrimidinone or a mixture of N-formylmorpholine and N-acetylmorpholine Wherein R1 is an alkyl group having from 1 to 6 carbon atoms; R2 is hydrogen or an alkyl group having from 1 to 4 carbon atoms; Alk is an alkylene group, branced or unbranced, having from 2 to 4 carbon atoms, and n is from 1 to 10; and b) at least one alkanolamine compound of the formula (II) or at least one piperazine compound of formula (III) wherein R3 is hydrogen, an alkyl group having from 1 to 6 carbon atoms, or the R4OH group; R4 is a branched or unbranched alkylene group having from 1 to 6 carbon atoms; R5, independently in each occurrence, is hydrogen or an hydroxyalkyl group having from 1 to 4 carbon atoms; and R6 is hydrogen, an alkyl group having from 1 to 6 carbon atoms or an hydroxyalkyl group having from 1 to 4 carbon atoms. ~

La présente invention concerne une nouvelle composition de solvant qui permet d'éliminer sélectivement du COS se trouvant dans un flux de gaz contenant ce dernier, ladite composition comprenant a) au moins un éther de polyalkylène glycol alkyle représenté par la formule (I) ou une 1,3-diméthyl-3,4,5,6-tétrahydro-2(1H)-pyrimidinone ou encore un mélange de N-formylmorpholine et de N-acétylmorpholine. Dans la formule, R¿1? représente un groupe alkyle comprenant de 1 à 6 atomes de carbone; R¿2? représente hydrogène ou un groupe alkyle comprenant entre 1 et 4 atomes de carbone; Alk représente un groupe alkylène, ramifié ou non ramifié, comprenant de 2 à 4 atomes de carbone et n est compris entre 1 et 10; et b) au moins un composé alcanolamine représenté par la formule (II) ou au moins un composé pipérazine représenté par la formule (III) dans laquelle R¿3? représente hydrogène, un groupe alkyle comprenant de 1 à 6 atomes de carbone, ou bien le groupe R¿4?OH; R¿4? représente un groupe alkylène ramifié ou non ramifié comprenant de 1 à 6 atomes de carbone; R¿5?, indépendamment dans chaque cas, représente hydrogène ou un groupe hydroxyalkyle comprenant de 1 à 4 atomes de carbone; et R¿6? représente hydrogène, un groupe alkyle comprenant de 1 à 6 atomes de carbone ou un groupe hydroxyalkyle comprenant de 1 à 4 atomes de carbone. Formules (I) (II) (III)

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