Liquid purification or separation – Filter – Material
Patent
1976-04-22
1978-02-14
Spear, Jr., Frank A.
Liquid purification or separation
Filter
Material
260 25AY, 260 25M, 264 49, B01D 3100
Patent
active
040737330
ABSTRACT:
A polyvinyl alcohol semi-permeable membrane is prepared which has micropores with an average diameter of 0.02 to 2 microns as defined by the interpore partition walls having thicknesses in the range of 50 to 5000 A and which is characterized by substantial cross-sectional uniformity. The membrane is prepared by extruding a PVA composition containing PAG with a molecular weight of 400 to 4,000 and a carbon-to-oxygen ratio of not more than 3 in a proportion of 2 to 200 parts by weight per 100 parts of PVA into a coagulation bath. In another embodiment of the invention, the membrane is formed from a PVA composition wherein the PAG has a molecular weight of 600 to 3,000 and a C/O ratio of not more than 3, the proportion of the PAG being 15 to 150 parts by weight per 100 parts of PVA and wherein the composition satisfies the relation: 0.65 .ltoreq. CBR (critical blending ratio) .ltoreq. 1.0. The membrane is useful in ultrafiltration, dialytic and osmotic separation applications.
REFERENCES:
patent: 3228877 (1966-01-01), Mahon
patent: 3423491 (1969-01-01), McLain et al.
patent: 3837500 (1974-09-01), Nicolas et al.
patent: 3907675 (1975-09-01), Chapurlat et al.
patent: 3951621 (1976-04-01), Hughei et al.
Kawai Syuji
Ohmori Akio
Takakura Koichi
Yamauchi Kazuhisa
Kuraray Co. Ltd.
Spear, Jr. Frank A.
LandOfFree
PVA membrane and method for preparing the same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with PVA membrane and method for preparing the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PVA membrane and method for preparing the same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-523522