Semipermeable membranes of copolyamides

Liquid purification or separation – Filter – Material

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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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Smith et al., "Convective Transport in a Batch Dialyzer", Chem. Eng. Prog. Symp. Series, No. 84, vol. 64, 1968, pp. 45-58.

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