Process for the production of semipermeable polybenzimidazole me

Details Process for the production of semipermeable polybenzimidazole me Process for the production of semipermeable polybenzimidazole me

1982-12-17

1985-04-23

Anderson, Philip

Liquid purification or separation

Filter

Material

264 41, 264205, 2642091, 264235, 264346, 521 64, 528342, B29D 2700

Patent

active

045128944

ABSTRACT:
A membrane cast in the form of either a hollow filament or a flat film formed of a polybenzimidazole polymer is subjected to an annealing process by contacting the membrane with a non-aqueous annealing medium comprised of a solvent for the polymer and a non-solvent for the polymer. Such an annealing step can advantageously occur at an annealing temperature below about 125.degree. C. (e.g., below 100.degree. C.) These polybenzimidazole membranes find particular utility in reverse osmosis desalination processes. The annealing step of the present invention improves the mechanical and separative properties of the membrane.

REFERENCES:
patent: 3699038 (1972-10-01), Boom
patent: 3851025 (1971-11-01), Ram
patent: 3920785 (1975-11-01), Druin
patent: 4448687 (1984-05-01), Wang

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