Method for recovering anionic fluorinated emulsifier
AssigneeAsahi Glass Company, Limited
InventorsMasahiro Takazawa, Shigeru Aida
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Abstract
To provide a method for recovering an acid of an anionic fluorinated emulsifier with a high yield from a basic ion exchange resin having a nonionic surfactant physically adsorbed thereon and having the anionic fluorinated emulsifier adsorbed thereon. A method for eluting and recovering an acid of an anionic fluorinated emulsifier from a basic ion exchange resin having a nonionic surfactant physically adsorbed thereon and having the anionic fluorinated emulsifier adsorbed thereon, which comprises a step (1) of bringing the basic ion exchange resin into contact with a water-soluble organic solvent and a step (2) of recovering the acid of the anionic fluorinated emulsifier from the basic ion exchange resin from which the ionic surfactant is eluted in the step (1).
Claims14
A method for recovering an anionic fluorinated emulsifier, which comprises eluting an anionic fluorinated emulsifier from a basic ion exchange resin having a nonionic surfactant physically adsorbed thereon and having the anionic fluorinated emulsifier adsorbed thereon and recovering it as an acid of the anionic fluorinated emulsifier, and which is characterized by comprising a step (1) of bringing the basic ion exchange resin into contact with a water-soluble organic solvent, and then a step (2) of recovering the acid of the anionic fluorinated emulsifier from the basic ion exchange resin from which the ionic surfactant is eluted in the step (1)
- wherein the step (2) comprises a step (2-1) of bringing the basic ion exchange resin into contact with an aqueous inorganic acid solution and a water-soluble organic solvent.
Dependencies are inferred from the claim text.