Liquid purification or separation – Filter – Material
Patent
1975-12-03
1977-12-13
Spear, Jr., Frank A.
Liquid purification or separation
Filter
Material
264 49, B01D 3100
Patent
active
040627829
ABSTRACT:
The present invention relates to the production of a novel membrane having a larger number of small sized pores therein such that the product rate in a reverse osmosis separation using said membrane is substantially increased for a particular separation factor. The invention is predicated upon the concept that the performance of a membrane in reverse osmosis separation is primarily dependent upon two interrelated factors, namely the structure of the polymer solution from which the film is cast and the evaporation rate during the period of evaporation of the organic solvent from the cast film. The present invention thus provides processes in which the solvent structure of the solution and the evaporation rate of the solution from the cast film is adjusted towards an optimum for producing a large number of small pores in the surface layer of the membrane to increase substantially the product rate at a given separation factor.
REFERENCES:
patent: 3133132 (1964-05-01), Loeb et al.
patent: 3133137 (1964-05-01), Loeb et al.
patent: 3283042 (1966-11-01), Loeb et al.
patent: 3429957 (1969-02-01), Merten
patent: 3446359 (1969-05-01), Loeb et al.
patent: 3524757 (1970-08-01), Havens
patent: 3567810 (1971-03-01), Baker
patent: 3592953 (1971-07-01), Ward et al.
patent: 3662046 (1972-05-01), Woo et al.
Banks et al., "Studies on Desalination by Reverse Osmosis," from J. Applied Chem., vol. 16, Mar., 1966, pp. 94-99.
Kunst Branko
Sourirajan Srinivasa
Canadian Patents and Development Ltd
Spear, Jr. Frank A.
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