Patent ID: 6860966
Filing Date: 2005-03-01
Classification: B01D,C08G

Abstract:
1. A method for removing solvent from a solution of a polyphenylene ether polymer resin in a wiped thin film evaporator said method comprising: feeding a solution comprising at least one organic solvent and a polyphenylene ether polymer resin into a wiped thin film evaporator having a heating chamber, forming a film of said solution on the wall of said heating chamber, and heating said film in the heating chamber of said wiped thin film evaporator operating under conditions for pressure, temperature, feed rate and solution solids concentration which satisfy two rate models, one model defines a rate of by-product formation of less than 250 ppm, the other model defines the vapor velocity of the material exiting the thin film evaporator of less than 1.5 ft/s.