Patent ID: 8834663
Filing Date: 2014-09-16
Classification: B01D,C02F,Y10T

Abstract:
1. A method for assembling an electrodeionization device having a spiral wound configuration comprising providing in a sequential arrangement: an anode, membrane cell assembly, cathode; wherein the membrane cell assembly is wound about a central tube and comprises at least one sequential arrangement of: a cation exchange membrane, concentrating chamber, anion exchange membrane, diluting chamber, cation exchange membrane, concentrating chamber and anion exchange membrane, wherein ion exchange resin is located in at least one chamber of the membrane cell assembly; and wherein the method is characterized by providing the ion exchange resin as an ion exchange spacer prepared by extruding a mixture of cation exchange resin particles and dissolvable binder to form a first band and extruding a mixture of anion exchange resin particles and dissolvable binder to form a second band adjacent to the first band, and wherein the bands are coalesced to form the ion exchange spacer and subsequently dissolving the binder with a solvent such that the spacer structure deteriorates leaving behind unbounded ion exchange resin particles, and wherein the dissolvable binder is a liquid with viscosity of at least 0.1 Pa sec at 20° C.