Permselective membrane and method for making and using same

Details Permselective membrane and method for making and using same Permselective membrane and method for making and using same

B - Operations, Transporting

01

D

182/13, 18/14

B01D 69/06 (2006.01) B01D 71/56 (2006.01) C08G 69/26 (2006.01)

Patent

CA 1117717

ABSTRACT OF THE DISCLOSURE Disclosed is a specific polyamide membrane suitable for hemo- filtration, 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 ? 10-3 to about 15 ? 10-3 cm/s ? bar, determined for water at 0.1 bar and 20°C, a thickness of not more than about 100 mi- crons, 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.

316623

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