Patent ID: 7749385
Filing Date: 2010-07-06
Classification: B01D

Abstract:
1. A method of using a semi-permeable membrane, the method comprising: passing a vegetable oil miscella through a dry semi-permeable membrane having a pore size of less than about 0.1 microns that is wettable by both water and by a liquid having a surface tension of less than 50 dyne/cm, resulting in a phospholipid containing retentate and a phosphorous reduced permeate; wherein the dry semi-permeable membrane is prepared by a method comprising the steps of: forming a wet semi-permeable membrane that has a pore size of less than about 0. 1 microns, provided the wet semi-permeable membrane does not comprise cellulose acetate, said forming step conducted by a phase inversion process; and drying the wet semi-permeable membrane at a temperature between 90-120° C. in the presence of a cationic, non-ionic, or amphoteric surfactant to provide said dry semi-permeable membrane that is wettable by both water and by a liquid having a surface tension of less than 50 dyne/cm.