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Membrane separation of ionic liquid solutions

United States Patent

September 1, 2015
View the Complete Patent at the US Patent & Trademark Office
A membrane separation process using a highly fluorinated polymer membrane that selectively permeates water of an aqueous ionic liquid solution to provide dry ionic liquid. Preferably the polymer is a polymer that includes polymerized perfluoro-2,2-dimethyl-1,3-dioxole (PDD). The process is also capable of removing small molecular compounds such as organic solvents that can be present in the solution. This membrane separation process is suitable for drying the aqueous ionic liquid byproduct from precipitating solutions of biomass dissolved in ionic liquid, and is thus instrumental to providing usable lignocellulosic products for energy consumption and other industrial uses in an environmentally benign manner.
Campos; Daniel (Atglen, PA), Feiring; Andrew Edward (Wilmington, DE), Majumdar; Sudipto (Newark, DE), Nemser; Stuart (Wilmington, DE)
14/ 527,732
October 29, 2014
Support was provided under Department of Energy grant DE-SC0011293, and Environmental Protection Agency grant EP-D-12-021. The U.S. government has rights in this patent application.