Method for recovering fluorinated emulsifiers

Details Method for recovering fluorinated emulsifiers Method for recovering fluorinated emulsifiers

C - Chemistry, Metallurgy

02

F

C02F 1/42 (2006.01) B01J 41/04 (2006.01) C07C 51/47 (2006.01)

Patent

CA 2387781

Fluorinated emulsifiers, in particular, perfluorooctanoic acid are bound to anionic exchange resins for the purification of aqueous effluent from the production of fluoropolymers. Said emulsifiers may be quantitatively eluted from the exchanger with a water-miscible organic solvent, containing a small amount of ammonia. It is of advantage to distil off the ammonia containing solvent, recycle the emulsifier to a further polymerisation and recycle the ammoniacal solvent for elution. Addition of alkalis improves the elution efficiency.

La présente invention concerne des émulsifiants fluorés, notamment de l'acide perfluorique, impliqués dans l'épuration d'eaux usées issues de la production de polymères fluorés sur des résines échangeuses d'anions. Ces émulsifiants se font éluer par l'échangeur, de façon quantitative, avec de faibles quantités de solvant organique contenant de l'ammoniac et pouvant se mélanger à l'eau. Avantageusement, le solvant contenant de l'ammoniac est éliminé par distillation après l'élution, l'émulsifiant est de nouveau soumis à une polymérisation et le solvant ammoniacal est de nouveau utilisé pour l'élution. L'ajout d'alcalis permet d'augmenter le rendement de l'élution.

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