Preparation of alkanesulfonyl halides and alkanesulfonic acids
US5035777A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Apr 20, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B3/23
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A continuous method is provided for preparing alkanesulfonyl halides, particularly chlorides and alkanesulfonic acids in high yields without the formation of undesirable side-products, and without the net production of hydrogen chloride as a by-product. The method involves the continuous electrolysis of an alkanethiol (RSH) or dialkyl disulfide (RSSR') in an aqueous hydrochloric acid-containing solution, continuously removing the electrolyzed product mixture from the electrolysis zone, and recovering the alkanesulfonyl chloride (RSO.sub.2 Cl) or alkanesulfonic acid (RSO.sub.3 H) product from the mixture. The alkyl groups in the dialkyl disulfide (R and R') may be straight or branched chain, substituted or unsubstituted, have 1 to 20 carbon atoms, preferably 1 to 12 carbon atoms, and may be different, but are preferably the same. The aqueous hydrochloric acid-containing medium and any unreacted sulphur compounds may be recycled through the electrolysis chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.