Recovery of fluorinated surfactants from a basic anion...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 6/16 (2006.01) B01J 49/00 (2006.01) C08F 2/24 (2006.01) C08F 6/14 (2006.01) C08L 27/12 (2006.01)

Patent

CA 2599761

The invention provides a method for recovery of an anionic fluorinated surfactant from a basic anion exchange resin having quaternary ammonium groups, the method comprising eluting the anion exchange resin with a composition comprising an ammonium salt and a water miscible organic solvent. The method according to the invention may provide one or more of the following advantages. For example, the method can be designed to allow for recovery of substantially all of the fluorinated surfactant from a basic anion exchange resin having quaternary ammonium groups. Also, the liquid used for recovering the surfactant from the anion exchange resin is a simple liquid that can be readily and cost effectively manufactured. Further the process may be carried out in a convenient and easy manner. Furthermore, the method generally does not require large amounts of the eluting composition.

L~invention concerne une méthode de récupération d'un tensio-actif fluoré anionique depuis une résine d~échange d~anions basique qui possède des groupes ammonium quaternaires ; cette méthode comprend l~élution de la résine d~échange d~anions avec une composition qui comporte un sel d~ammonium et un solvant organique miscible dans l~eau. La méthode décrite par l~invention présente un ou plusieurs des avantages suivants. Par exemple, la méthode peut être conçue pour récupérer quasiment tous les tensio-actifs fluorés depuis une résine d~échange d~anions basique qui possède des groupes ammonium quaternaires. En outre, le liquide utilisé pour récupérer le tensio-actif depuis une résine d~échange d~anions est un liquide simple qui peut être fabriqué facilement et à peu de frais. De plus, le processus peut se dérouler d~une manière pratique et facile. Enfin, la méthode ne nécessite en général pas de grandes quantités de composition d~élution.

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