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|1. (WO2018084958) METHOD OF MAKING IMPROVED POLYIMIDE SEPARATION MEMBRANES|
|Applicants:||DOW GLOBAL TECHNOLOGIES LLC
GEORGIA TECH RESEARCH CORPORATION
VAUGHN, Justin T.
KOROS, William J.
BRAYDEN, Mark M.
MARTINEZ, Marcos M.
|Title:||METHOD OF MAKING IMPROVED POLYIMIDE SEPARATION MEMBRANES|
A polyimide separation membrane is comprised of a polyimide, a halogen compound (e.g., halogenated aromatic epoxide) that is soluble in the polyimide and a hydrocarbon having 2 to 5 carbons (e.g., ethane, ethylene, propane or propylene). The gas separation membrane has improved selectivity for small gas molecules such as hydrogen compared to polyimide membrane not containing the halogen compound or hydrocarbon. The polyimide separation membrane may be made by shaping a dope solution comprised of a polyimide, a halogen containing compound that is soluble in the polyimide, removing the solvent and then exposing the untreated polyimide membrane to a treating atmosphere comprising a hydrocarbon having 2 to 5 carbons for a sufficient time to form the polyimide membrane.