Sulfonation of anthraquinone in sulfur dioxide solvent
US4124606A · kind A · utility
9Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1976 |
| Grant date | Nov 7, 1978 |
| Priority date | — |
| Expiry date | Dec 8, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C309/28
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sulfonation of anthraquinone by a sulfur trioxide component including SO.sub.3 or oleum in a liquid sulfur dioxide solvent. When a mercury catalyst is used to give alpha anthraquinone sulfonate products, most of the mercury is left in the reactor or recovered with unreacted anthraquinone by precipitation with water after vaporization of the sulfur dioxide. High sulfuric acid and mercury pollution are thus avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.