Method for preparing thin regenerated cellulose membranes of high flux and selectivity for organic liquids separations
Patent
·
OSTI ID:5876187
A method is described for the production of regenerated cellulose membranes which method comprises the steps of: dissolving a cellulose material to form a solution; casting the cellulose solution into a film; coagulating the cellulose solution film using an alkali alcoholic solution; washing the coagulated cellulose film in an alcohol; regenerating the cellulose film using acidic alcohol solution; washing the regenerated cellulose membrane using an alcohol; The regenerated cellulose thus formed may be dried, if desired, preferably without a softener. The regenerated cellulose thus produced, when prepared in the form of a film or membrane, possesses higher flux and superior selectivity for organic liquid separation than regenerated cellulose membranes prepared employing aqueous solutions in steps b through e avove and is most advantageously employed for the recovery of polar dewaxing solvents (e.g. ketones and mixed ketone/aromatic solvents) from dewaxed oil.
- Assignee:
- Exxon Research and Engineering Co.
- Patent Number(s):
- US 4496456
- OSTI ID:
- 5876187
- Country of Publication:
- United States
- Language:
- English
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