Thin cellulose membrane regenerated in alcoholic acid...

Details Thin cellulose membrane regenerated in alcoholic acid... Thin cellulose membrane regenerated in alcoholic acid...

C - Chemistry, Metallurgy

08

J

18/25, 196/252

C08J 9/28 (2006.01) C10G 73/12 (2006.01)

Patent

CA 1254006

ABSTRACT OF THE DISCLOSURE A method for the production of regenerated cellulose membranes comprising the steps of a) dissolving a cellulose material to form a solution; b) casting the cellulose solution into a film; c) coagulating the cellulose solution film using an alkali alcoholic solution; d) washing the coagulated cellulose film in an alcohol; e) regenerating the cellulose film using acidic alcohol solution; f) washing the regenerated cellulose mem- brane using an alcohol. The regenerated cellulose thus formed may be dried, if desired, preferably without a softener. The regenerated cellulose membrane thus produced, possesses higher flux and superior selec- tivity for organic liquid separation than regenerated cellulose membranes prepared employing aqueous solu- tions in steps b through e above and is most advan- tageously employed for the recovery of polar dewaxing solvents (e.g. ketones and mixed ketone/aromatic solvents) from dewaxed oil.

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