C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/42 (2006.01) C02F 1/54 (2006.01) C07C 51/47 (2006.01)
Patent
CA 2379931
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.
Selon l'invention, des émulsifiants fluorés peuvent être récupérés à partir d'une phase aqueuse contenant de faibles quantités de particules de polymères fluorés. A cet effet, on traite la phase aqueuse avec une faible quantité d'un tensioactif non ionique, puis on met la phase aqueuse, ainsi ajustée, en contact avec une résine échangeuse d'anions et on sépare l'émulsifiant adsorbé contenu dans la résine échangeuse d'anions. Dans la phase aqueuse non traitée ou dans l'éluat, le polymère fluoré en fines particules peut subir une précipitation quantitative au moyen d'agents de floculation.
Burkard Georg
Hintzer Klaus
Lohr Gernot
Dyneon Gmbh & Co. Kg
Smart & Biggar
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