Permselective membrane and use

Details Permselective membrane and use Permselective membrane and use

1978-11-20

1980-10-21

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210500M, 521 64, 521185, B01D 1300

Patent

active

042292913

ABSTRACT:
Disclosed is a specific polyamide membrane suitable for hemofiltration, comprising a permselective asymmetric membrane of heteroporous structure comprising a polyamide which comprises a plurality of recurring terephthaloyldiamine units. The membrane has an ultrafiltration capacity of from about 1.5.SM.10.sup.-3 to about 15.multidot.10.sup.-3 cm/s.multidot.bar, determined for water at 0.1 bar and 20.degree. C., a thickness of not more than about 100 microns, and a molecular weight exclusion limit of from about 20,000 to about 70,000 Dalton. The membrane is produced in a process which comprises introducing a solution of the polyamide in a water-miscible organic solvent into an aqueous precipitating liquid to obtain a coagulated membrane sheet, which is subsequently washed and dried.

REFERENCES:
patent: 3228876 (1966-01-01), Mahon
patent: 3567632 (1971-03-01), Richter et al.
patent: 3615024 (1971-10-01), Michaels
patent: 3619424 (1971-11-01), Blanchard et al.
patent: 3923664 (1975-12-01), Grover et al.
patent: 3935172 (1976-01-01), Vogel et al.
patent: 4002563 (1977-01-01), Vogl et al.
N. K. Man, Med. Klin. 71 (1976), pp. 1279-1287, (Nr 32/33).
"Kunststoffe", vol. 64, pp. 365-371 (1974).

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