Preparation of cellulose acetate membrane and its use for polar

Details Preparation of cellulose acetate membrane and its use for polar Preparation of cellulose acetate membrane and its use for polar

1983-12-14

1985-09-17

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

208 33, 2105002, 264200, 264207, 264235, 264330, B01D 1300

Patent

active

045419728

ABSTRACT:
It has been discovered that cellulose acetate membranes, fabricated using nonaqueous solvent systems, can be used for the separation of polar solvents, especially ketone dewaxing solvents from dewaxed oil. The cellulose acetate membranes so prepared are of a reduced acetyl content and exhibit very good resistance to ketone solvents. The specific fabrication procedure avoids exposing the cellulose acetate to even transient mixtures of ketone and alcohol or ketone and water. Although the cellulose acetate polymer is insoluble in pure water, alcohol, or ketone it is soluble in mixtures of ketone-alcohol and ketone-water.
The resulting membrane is an effective means for separating ketone dewaxing solvent from dewaxed oil.

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