B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/14
B29D 7/00 (2006.01) C02F 1/44 (2006.01) C08J 5/18 (2006.01) C08J 5/22 (2006.01) C08J 9/00 (2006.01)
Patent
CA 1078117
ABSTRACT OF THE DISCLOSURE An asymmetrical permselective cellulose triacetate membrane is provided which 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 50-100°C in water which may contain a modifying agent, and dried.
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