Liquid purification or separation – Filter – Material
Patent
1991-08-19
1994-01-18
Dawson, Robert A.
Liquid purification or separation
Filter
Material
2105001, 21050027, 210490, 4283044, B01D 3900
Patent
active
052797392
ABSTRACT:
The subject of this invention is a novel polymeric composition useful in membrane technology such as microfiltration, nanofiltration, ultrafiltration, reverse osmosis and gas separation. The composition is formed by taking a known condensation polymer such as polyether sulfone, polysulfone or a polyarylether sulfone and modifying it to change the molecular weight distribution. The useful polymers of the invention will have an unmodified number average molecular weight of about 63,000 or less and weight fraction of molecules with a molecular weight of 50,000 or less in the range of 30 to 35%. Utilizing fractional precipitation or other known techniques for concentrating a high molecular weight fraction of a polymer the polymers are modified to have a number average molecular weight of a least 59,000 or a weight fraction of molecules with a molecular weight of 50,000 or less of not more than 19%. Superior resistance to cracking and other forms of membrane degradation results from using the polymer compositions of the present invention in filtration applications.
REFERENCES:
patent: 4690766 (1987-09-01), Linder et al.
patent: 4720343 (1988-01-01), Walch et al.
patent: 4814082 (1989-03-01), Wrasidlo
patent: 4867881 (1989-09-01), Kinzer
patent: 4906375 (1990-03-01), Heilmann
patent: 5009824 (1991-04-01), Walch et al.
Miyano, T., et al., "Effect of Polymer Molecular Weight, Solvent and Casting Solution Composition on the Pore Size and the Pore Size Distribution of Polyethersulfone (Victrex) Membrane", Chem. Eng. Comm., 1990, vol. 95, pp. 11-26.
Dawson Robert A.
Fortuna Ana M.
Koch Membrane Systems, Inc.
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