B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/16
B01D 71/64 (2006.01)
Patent
CA 1262807
ABSTRACT OF THE DISCLOSURE Asymmetric polyimide reverse osmosis membranes of high flux and selectivity for organic liquid separations are described. These membranes are prepared from undegraded polyimide by dissolving from 14-30 wt.% of the undegraded polymer in a dual solvent system comprising a polymer pro-solvent/anti-solvent wherein the pro-solvent is DMF and the anti-solvent is dioxane, wherein the ratio of anti-solvent/pro-solvent ranges from about 10:1 or more-1:1, preferably about 8:1-1.5:1, most preferably about 7:1-3:1; the polymer-solvent mixture is spread into a thin film of the desired thickness and permitted to evaporate for a time just sufficient to permit formation of an asymmetric dense active layer, i.e., within the range 2-120 seconds, preferably 2-60 seconds, most preferably 2-20 seconds before being immersed in a gelation bath. The membranes may be fabricated in the form of sheets, tubes, hollow fibers, etc. Mixtures of organic liquids, and especially mixtures of dewaxing solvents and dewaxed oils, are separated one from the other after completion of dewaxing operations, using the asymmetric polyimide reverse osmosis membrane described above.
454142
Shuey Harry F.
Wan Wankei
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
Shuey Harry F.
Wan Wankei
LandOfFree
Polyimide reverse osmosis membrane produced using dioxane... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyimide reverse osmosis membrane produced using dioxane..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyimide reverse osmosis membrane produced using dioxane... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1197289