Patent · US Expired

Fluorinated carboxylic acid recovery and reuse

US6720437B2 · kind B2 · utility

22Cited by

13References

9Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Clay Woodward Jones · Fort Collins, US
Ta-Wei Fu · Vienna, US

Key dates

Filing date	Jan 30, 2002
Grant date	Apr 13, 2004
Priority date	—
Expiry date	Apr 11, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/42
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Fluorinated carboxylic acid, used as a surfactant in fluoropolymerization in aqueous media, can be recovered by scrubbing from the exhaust gas of the dryer during polymer drying and, after concentration and treatment with alumina, directly reused in fluoropolymerization in aqueous media.

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