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1. (WO2001005710) METHOD FOR RECOVERING FLUORINATED EMULSIFIERS FROM AQUEOUS PHASES

Pub. No.:    WO/2001/005710    International Application No.:    PCT/EP2000/006556
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Wed Jul 12 01:59:59 CEST 2000
IPC: B01J 41/04
C02F 1/42
C02F 1/54
C07C 51/47
Applicants: DYNEON GMBH & CO. KG
BURKARD, Georg
HINTZER, Klaus
LÖHR, Gernot
Inventors: BURKARD, Georg
HINTZER, Klaus
LÖHR, Gernot
Title: METHOD FOR RECOVERING FLUORINATED EMULSIFIERS FROM AQUEOUS PHASES
Abstract:
The invention relates to a method for recovering fluorinated emulsifiers from an aqueous phase containing small quantities of fluoro-polymer particles. According to the inventive method, the aqueous phase is treated with a small quantity of a non-ionic surface-active agent, the treated aqueous phase is brought into contact with an anionic exchanger resin, and the adsorbed emulsifier is separated from the exchanger resin. The fine particle fluoro polymer can be quantitatively precipitated in the untreated aqueous phase or the eluate.