| Abstract: | Cellulose acetate hollow fibers were spun by a new method—a dry–wet spinning technique of a 3C-shaped spinneret. The spinning technique parameters effecting the form and the reverse osmosis performances of the hollow fiber were investigated in detail, such as polymer concentration, the kind of solvent and additive, spinneret temperature, extrasion rate, evaporation distance, and take-up rate. Heat treating for different times in several treating baths was tested. The results showed that cellulose acetate hollow fiber spun by this method is feasible and is a kind of “loose” reverse osmosis membrane and suitable to operate at ultralow pressure, 0.8 MPa, and exhibits a higher flux rate at a salt rejection of 60–85% for tap water. Cellulose acetate hollow fiber for ultralow pressure reverse osmosis should find wide application in industrial processes. © 1996 John Wiley & Sons, Inc. |
