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US 4,545,965 AGranted
Process of selective separation of hydrogen sulfide from gaseous mixtures containing also carbon dioxide
AssigneeSnamprogetti S.p.A.
InventorsLuigi Gazzi, Carlo Rescalli, Maria A. Scaramucci, Alessandro Ginnasi
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Abstract
There is disclosed a process for selectively separating hydrogen sulfide from gaseous mixtures which also contain carbon dioxide by chemical absorption with a substantially anhydrous solution of a tertiary amine, such as methyl diethanolamine, and an auxiliary organic solvent, such as sulfolane.
Claims4
A process for selective separation of hydrogen sulfide from gaseous mixtures containing carbon dioxide by selective absorption with a substantially anhydrous solution consisting essentially of:
- (a) a tertiary amine selected from the group consisting of methyl diethanol amine, dimethyl ethanol amine, ethyl diethanol amine, diethyl ethanol amine, propyl diethanol amine, dipropyl ethanol amine, isopropyl diethanol amine, di-isopropyl ethanol amine, methyl di-isopropanol amine, ethyl di-isopropanol amine, propyl di-isopropanol amine, triethanol amine, N-methyl morphaline and mixtures thereof;
- and
- (b) an organic solvent selected from the group consisting of sulfolane, N-methyl-pyrrolidone, N-methyl-3-morpholone, di-e-mono (C.sub.1 -C.sub.4) alkylether-monoethylene glycol, di-e-mono (C.sub.1 -C.sub.4) alkylether-polyethylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, N,N-dimethylformamide, N-formyl-morpholine, N,N-dimethylimidazolidin-2-one, N-methyl-imidazole and mixtures thereof,
- said tertiary amine being present in an amount between 10 and 70 percent by weight of the total solution and water present in the solution being less than 2 percent by weight of the total solution and selectively absorbing hydrogen sulfide.
1 more element
Dependencies are inferred from the claim text.