Mixtures of physical absorption solvents and ionic liquids for gas separation

摘要

The invention comprises an absorbent composition and process for purification of gaseous mixtures. The composition comprises a mixture of a physical absorption solvent and an ionic liquid. It was found that the mixtures provided improved absorption of a gas component, such as carbon dioxide, when compared physical absorption solvents.

主权项

1. A method of purifying a gas mixture comprising contacting said gas mixture with a mixture of a phosphonium or an imidizolium ionic liquid and a physical absorption solvent selected from the group consisting of a mixture of dimethyl ethers of propylene glycol (CH3O(C2H4O)nCH3 (where n is between 2 and 9)) and N-methyl-2-pyrrolidone in an absorbent zone wherein said ionic liquid and physical absorption solvent mixture absorbs at least one component from said gas mixture, and the said ionic liquid and physical absorption solvent mixture is regenerated to remove said absorbed component or components.