Patent ID: 6706190
Filing Date: 2004-03-16
Classification: B01D,C08G,D21H

Abstract:
A process for the fractionation of water-soluble or water-dispersible synthetic amino-containing polymers by ultrafiltration, wherein the process comprises the following steps:a) continuous passage of the polymer solution or dispersion to an ultrafiltration unit, and mixing with retentate recycled from step d) and, optionally, essentially polymer-free aqueous medium, b) separation of the mixture in the ultrafiltration unit into a permeate and a retentate, c) discharge of the permeate from the process, d) discharge of some of the retentate from the process; recycling the remainder of the retentate in step a), e) passage of that part of the retentate discharged in d) to at least one further ultrafiltration unit, and treatment thereof by a process comprising the steps a) to d).