Fluorinated alkanoic acid purification process
US6437159B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2001 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jul 31, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process that can be used for isolating a fluorinated alkanoic acid from an aqueous solution also containing inorganic fluorides is provided. This process comprises (A) acidifying an aqueous solution comprising an ammonium or metal salt of a fluorinated alkanoic acid to produce an acidified solution, (B) heating the acidified solution to produce an organic layer and an aqueous layer, (C) separating and recovering the organic layer from the aqueous layer, (D) optionally washing the organic layer with an acid solution, (E) optionally isolating the fluorinated alkanoic acid, and (F) further optionally converting the fluorinated alkanoic acid to its ammonium or alkali metal salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.