Process for preparing 3-sulfobenzoic acid and alkali metal salts thereof
US5387711A · kind A · utility
0Cited by
9References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Aug 6, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/32
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for preparing 3-sulfobenzoic acid and alkali metal salts thereof is disclosed. The present invention relates to a process for preparing 3-sulfobenzoic acid and/or alkali metal salts thereof, which comprises mixing 3-(chlorosulfonyl)benzoic acid with water and a water-immiscible solvent in which 3-sulfobenzoic acid is insoluble or only sparingly soluble, removing water from the mixture by azeotropic distillation, cooling and, if desired, admixing the 3-sulfobenzoic acid formed with alkali metal hydroxide and/or a substance forming alkali metal hydroxide and again removing water by azeotropic distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.