Process for removing the solvent from a polymer solution

Details Process for removing the solvent from a polymer solution Process for removing the solvent from a polymer solution

B - Operations, Transporting

29

B

402/7, 18/946

B29B 7/84 (2006.01) C08C 2/06 (2006.01) C08F 6/10 (2006.01)

Patent

CA 1321852

ABSTRACT OF THE INVENTION Solvent is removed from a polymer solution in a single-system process in which the heated polymer solution at a pressure higher than the boiling pressure of the solvent is introduced into a hopper feeding a worm screw; the solution is then depressurized thereby removing a major portion of the solvent via a ventilation zone situated to the rear of the feed hopper; the solution is then reheated, repressurized, and forced forward; the remainder of the solvent is then removed in the ventilation zones forward of the feed hopper; and the solvent-free polymer is then immediately pelletized.

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