Liquid purification or separation – Filter – Material
Patent
1978-06-29
1980-08-12
Wyse, Thomas G.
Liquid purification or separation
Filter
Material
521147, B01D 3100
Patent
active
042172276
ABSTRACT:
The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 10% by weight preferably from 4.5 to 8% by weight as measured on approximately 40.mu. thick symmetrical films at room temperature and 65% relative air humidity, with a throughflow of at least 80 1/m.sup.2 d for a desalination level of at least 85% and consisting of a fully aromatic copolyamide with a relative viscosity of .gtoreq.1,4, as measured on a 0.5% N-methyl pyrrolidone solution at a temperature of 20.degree. C.
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patent: 3567632 (1971-03-01), Richter et al.
patent: 3733308 (1973-05-01), Bach
patent: 3801545 (1974-04-01), Kunzel et al.
patent: 3862088 (1975-01-01), Wolf et al.
patent: 3926923 (1975-12-01), Preston
patent: 3993625 (1976-11-01), Kurihara et al.
patent: 4086215 (1978-04-01), Kurihara et al.
patent: 4100238 (1978-07-01), Shinomura
Smith et al., "Convective Transport in a Batch Dialyzer", Chem. Eng. Prog. Symp. Series, No. 84, vol. 64, 1968, pp. 45-58.
Bentz Francis
Elfert Klaus
Kunzel Hans E.
Wolf Gerhard D.
Bayer Aktiengesellschaft
Sadowski David R.
Wyse Thomas G.
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