Patent ID: 9120834
Filing Date: 2015-09-01
Classification: B01D,C07C,C07D,C07F

Abstract:
1. A method of separating an ionic liquid from a mixture comprising the steps of (i) providing the mixture that comprises ionic liquid and a liquid component selected from the group consisting of water, a small molecular compound and a blend thereof, (ii) providing a separator having a membrane comprising a selectively permeable, nonporous layer comprising a highly fluorinated polymer, through which membrane the liquid component transfers preferentially relative to the ionic liquid, (iii) providing a feed of the mixture in which the liquid component is present at an initial concentration, (iv) permeating components of the feed through the membrane, thereby selectively removing the liquid component from the feed, and (v) recovering from the membrane separator a liquid retentate product comprising the liquid component at a final concentration substantially lower than the initial concentration in which the highly fluorinated polymer comprises repeating units of a perfluorinated monomer selected from the group consisting of perfluoro-2,2-dimethyl-1,3-dioxole (PDD), 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole (TTMD), perfluoro-2-methylene-4-methyl-1,3,dioxolane (PMD), perfluoro(4-vinyloxyl-1-butene) (PVOB), perfluoro (alkenyl vinyl ether) (PFVE), and a mixture thereof.