Method for recovering anionic fluorinated emulsifier

Abstract

To provide a method for recovering an anionic fluorinated emulsifier, whereby an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin can be simply and efficiently recovered. An aqueous inorganic acid solution and an organic solvent having a nitrile group are contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, to recover a liquid phase containing the anionic fluorinated emulsifier, or an aqueous inorganic acid solution is contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, then an organic solvent having a nitrile group is contacted thereto, and thereafter the basic ion exchange resin and a liquid phase are separated to recover the liquid phase, whereupon from the liquid phase, an acid of the anionic fluorinated emulsifier is recovered.

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