Method for preparing a trifluoromethanesulfinic acid salt
US8471059B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2008 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Nov 25, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C313/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method for preparing a salt of trifluoromethanesulphinic acid termed “triflinic acid”. More specifically, the invention relates to a method for preparing a highly pure triflinic acid salt. The method of the invention for preparing a highly pure triflinic acid salt, starting from an aqueous mixture comprising the latter combined with a trifluoroacetic acid salt and saline impurities resulting from the method for preparing same, is characterized in that said mixture is subjected to the following operations: —first controlled acidification such that the trifluoroacetic acid salt is essentially released in the acid form thereof, the majority of the triflinic acid remaining in a salified form, —optional separation of the salts originating from the acid having been used for the acidification and recovery of an aqueous phase, —separation of the trifluoroacetic acid from the separated aqueous phase comprising the alkaline salt of triflinic acid, trifluoroacetic acid, triflinic acid and the excess strong acid, therefore resulting in an aqueous phase depleted of trifluoroacetic acid but comprising the alkaline salt of triflinic acid, —recovery of the alkali…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.