Patent ID: 6036030
Filing Date: 2000-03-14
Classification: B01D

Abstract:
A method for casting a polymeric membrane on the inside surface of a porous wall tube to create a permeate separation system, the steps comprising:(a) forming a polymer solution consisting of a polymer dissolved in a liquid solvent;(b) pouring the polymer solution into the porous tube, said porous wall tube having a cap at one end;(c) capping the other end of the porous wall tube so that the polymer solution is sealed within the porous tube;(d) aligning the longitudinal axis of the porous tube in a substantially horizontal position;(e) rotating the aligned porous tube about its longitudinal axis at a speed of less than 60 revolutions per minute so that the polymer solution solvent evaporates through the porous wall tube to provide a polymer film having a uniform thickness on the inside surface of the porous wall tube, the polymer film and porous wall tube thereby constituting the permeate separation system.