Process for manufacturing membranes for osmotic separation

Details Process for manufacturing membranes for osmotic separation Process for manufacturing membranes for osmotic separation

1977-03-18

1979-04-03

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 23F, 210500M, 264 41, B01D 1300

Patent

active

041476220

ABSTRACT:
An asymmetrical permselective cellulose triacetate membrane has outstanding properties for desalination of seawater by reverse osmosis. It is made by casting a solvent solution of the cellulose triacetate in a solvent mixture of at least 40% acetone, a solvent for the triacetate and a swelling agent for the triacetate. The swelling agent, preferably formamide, must be added as the last component of the solution. After exposing the cast solution to evaporation for 2-90 seconds, it is precipitated in cold water, and then optionally tempered at 50.degree.-100.degree. C. in water which may contain a modifying agent, and dried.

REFERENCES:
patent: 3497072 (1970-02-01), Cannon
patent: 3846404 (1974-11-01), Nichols
patent: 4026978 (1977-05-01), Mungle et al.

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