Composite semipermeable membranes made from polyethylenimine

Details Composite semipermeable membranes made from polyethylenimine Composite semipermeable membranes made from polyethylenimine

1974-09-05

1976-04-20

Spear, Jr., Frank A.

Liquid purification or separation

Filter

Material

260 2EN, 260 25AY, 260898, 260823, 260 793R, 260 775CH, 260 78SC, 260 78TF, 528273, 528288, 528367, 528422, B01D 3900, B01D 3100

Patent

active

039518159

ABSTRACT:
Composite semipermeable membranes are made by reacting a film-forming polymer with a cross-linking monomer to form a polymeric ultrathin film having semipermeable properties. During the formation, a grafting reaction is carried out at reactive sites so there are few remaining active sites where oxidizing attack or fouling can potentially occur. One composite membrane comprises a microporous substrate and an ultrathin polyamide film formed of polyethylenimine cross-linked with a monomer, such as an acyl halide, a chloroformate, an isocyanate or a sulfonyl chloride. Grafted onto the cross-linked polyethylenimine at what would otherwise be secondary amido sites is an epoxide, an aldehyde, an anhydride or a reactive ethylene compound.

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