RECOVERY OF BRANCHED FLUORINATED EMULSIFIERS

摘要

Described herein is a process for recovering a branched, ether-containing fluorinated emulsifier from an anion exchange resin by (1) contacting the anion exchange resin with a recovery fluid to form an eluate, the recovery fluid comprising an ammonium salt, water, and a water-miscible solvent, wherein the fluorinated emulsifier is of the formula: [Rf-(0-R′f)n-0-CF(CF3)-C(0)0-]i M+1; and (2) separating the anion exchange resin from the eluate.

主权项

1. A process for recovering a fluorinated emulsifier from an anion exchange resin, comprising
contacting the anion exchange resin with a recovery fluid to form an eluate, the recovery fluid comprising an ammonium salt, water, and a water-miscible solvent, wherein the fluorinated emulsifier is of the formula:
[Rf-(O—R′f)n-O—CF(CF3)—C(O)O−]i M+i wherein Rf is a fluorinated alkyl group comprising 1 to 5 carbon atoms; R′f is a divalent fluorinated group comprising 1 to 5 carbon atoms; n is 0, 1, 2, or 3; and M+i represents a cation having the valance i and i is 1, 2 or 3; andseparating the anion exchange resin from the eluate.