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

1984-05-15

Anderson, Philip E.

Liquid purification or separation

Filter

Material

264 41, 264235, 264346, 521 64, 521188, 528342, B29D 2700

Patent

active

044486871

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 an annealing medium comprised of a solvent for the polymer and water. Such an annealing step can advantageously occur at an annealing temperature below the boiling point of water, thus avoiding the necessity for removing water present in the membrane in a conventional pre-annealing treatment step. 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 and is simple in comparison to conventional annealing procedures.

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Vogel, Herward and C. S. Marval, "Polybenzimidazoles, New Thermally Stable Polymers," in Journal of Polymer Science, vol. L, pp. 511-539 (1961).

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