Patent · US Active

Method for removing perfluorinated alkanoic acids

US10744497B2 · kind B2 · utility

3Cited by

5References

15Claims

0Family size

Assignee

3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

Tilman C. Zipplies · Burghausen, DE
Klaus Hintzer · Woodbury, US
Helmut Traunspurger · Julbach, DE
Karl D. Weilandt · Minneapolis, US

Key dates

Filing date	Mar 2, 2017
Grant date	Aug 18, 2020
Priority date	—
Expiry date	Apr 30, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C59/135
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Provided are methods for removing a perfluorinated alkanoic acid from solutions containing the perfluorinated alkanoic acid and a fluorinated alkoxy acid. These methods include contacting the first solution with an anion-exchange resin to produce a second solution and a resultant anion-exchange resin having perfluorinated alkanoic acid adsorbed thereto, wherein the perfluorinated alkanoic acid is present in the first solution at a first concentration and is present in the second solution at a second concentration which is lower than the first concentration, and separating the second solution from the resultant anion-exchange resin.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.