Asymmetrical membrane of polyester-amide and process for prepari

Details Asymmetrical membrane of polyester-amide and process for prepari Asymmetrical membrane of polyester-amide and process for prepari

1987-06-09

1989-11-07

Anderson, Philip

Liquid purification or separation

Filter

Material

264 41, 26433119, B01D 1300, C08J 928

Patent

active

048790362

ABSTRACT:
An asymmetrical membrane for use in dialysis and ultra-filtration is prepared using a polyester-amide (TATE).sub.n, wherein T represents a radical of terephthalic acid, A represents a radical of hexamethylenediamine, and E represents a radical of hexanediol, in a solvent of formic acid or in a solvent comprising a solution of lithium chloride in dimethylformamide or dimethylacetamide. The polyester-amide (TATE).sub.n is formed into a thin layer and placed into an aqueous coagulation bath to coagulate the resulting membrane. The membrane has a thickness of from 15 to 190 .mu.m, a water permeability of from about 3 up to about 9 liters/m.sup.2 /hour for a .DELTA.P of 300 mm.sub.HG and is permeable for substances having a molecular weight of up to about 17,000.

REFERENCES:
patent: 3962158 (1976-06-01), Mima et al.
patent: 4460526 (1984-07-01), Makino et al.
patent: 4673418 (1987-06-01), Peinemann

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