Patent ID: 6706193
Filing Date: 2004-03-16
Classification: B01J,C02F,C07C

Abstract:
A process for the recovery of fluorinated emulsifiers from an aqueous phase which, besides the emulsifier, contains small amounts of fluoropolymer particles, the process comprising;(a) determining desorption of the fluorinated emulsifier bound to an anion exchanger; (b) determining an upper concentration value of a nonionic surface-active substance below which no further decrease in desorption of the emulsifier bound to the anion exchanger takes place, (c) adjusting the aqueous phase to a concentration of nonionic surface-active agent of between the upper concentration value determined in this way and a lower concentration which is effective for preventing coagulation of the polymer particles, (d) contacting the aqueous phase with an anionic exchanger resin in order to effect the adsorption of the emulsifier onto the exchanger resin, and (e) liberating the emulsifier is liberated from the exchanger resin.