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1. (WO2018084958) METHOD OF MAKING IMPROVED POLYIMIDE SEPARATION MEMBRANES

Pub. No.:    WO/2018/084958    International Application No.:    PCT/US2017/053151
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Tue Sep 26 01:59:59 CEST 2017
IPC: B01D 67/00
B01D 69/08
B01D 71/46
B01D 71/52
B01D 71/64
B01D 69/02
C08L 63/00
C08L 79/08
B01D 53/22
C08G 73/10
Applicants: DOW GLOBAL TECHNOLOGIES LLC
GEORGIA TECH RESEARCH CORPORATION
Inventors: XU, Liren
VAUGHN, Justin T.
QIU, Wulin
KOROS, William J.
BRAYDEN, Mark M.
MARTINEZ, Marcos M.
Title: METHOD OF MAKING IMPROVED POLYIMIDE SEPARATION MEMBRANES
Abstract:
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.