Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1985-04-15
1990-06-12
Spear, Frank
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
21050039, 264 41, B01D 7106
Patent
active
049330837
ABSTRACT:
A composite permselective membrane comprises an ultrathin semipermeable layer comprising a polybenzimidazole polymer in occluding contact with at least one surface of a microporous polymer support layer. Such membranes provide better combinations of flux and rejection rates in reverse osmosis processes than do conventional semipermeable membranes of polybenzimidazole polymer alone. In an embodiment, a composite permselective membrane is prepared by casting an ultrathin semipermeable layer of the polybenzimidazole polymer on a microporous polymer support layer. The semipermeable layer is preferably subjected to a drying step to evaporate part of the polybenzimidazole polymer solvent, then contacted with a coagulating bath. In some cases, the properties of the composite permselective membrane can be improved by annealing by contacting with an annealing liquid at an elevated temperature, the annealing liquid being selected from the group consisting of aqueous and non-aqueous solutions of liquid organic compounds which are solvents or non-solvents for the polybenzimidazole, and neat liquid organic compounds which are nonsolvents for said polybenzimidazole polymer.
REFERENCES:
patent: 3720607 (1973-03-01), Brinegar
patent: 3883626 (1975-05-01), Kamide et al.
patent: 3951920 (1976-04-01), Senoo et al.
patent: 4230463 (1980-10-01), Henis et al.
Hoechst Celanese Corp.
Spear Frank
LandOfFree
Polybenzimidazole thin film composite membranes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polybenzimidazole thin film composite membranes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polybenzimidazole thin film composite membranes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-615678