C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/574, 260/588
C07C 27/26 (2006.01) B01D 61/36 (2006.01) B01D 69/12 (2006.01) B01D 71/44 (2006.01) C07C 17/38 (2006.01) C07C 29/76 (2006.01) C07C 31/02 (2006.01)
Patent
CA 2026660
ABSTRACT OF THE INVENTION (79,257-F) Concentration of aqueous solutions of isopropanol may be effected by a composite membrane including a dibromo- butane cross-linked poly(4-vinyl pyridine) bonded to a porous layer of polyacrylonitrile on a polyester backing. 10/09/89 A:CGS5 - 3 -
Smart & Biggar
Texaco Development Corporation
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