Process for the production of aromatic sulfonates
US3957859A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1973 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | May 8, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Aromatic sulfonates having, respectively, preferential oil-, and water- and alcohol-solubility are prepared by reacting aromatic compounds and sulfuric acid in a medium capable of liquid-liquid extraction with water; the product stream is then subjected to countercurrent extraction against water in a first multi-stage column; the water stream is next subjected to countercurrent extraction against a water-immiscible higher alcohol in a second multi-stage column; and the sulfonate having preferential water- and alcohol-solubility, which has transferred from the product stream, to the water stream, and finally to the higher alcohol, is recovered from the latter as the free acid or as a salt thereof. The process is especially adapted to the production of dinonylnaphthalene disulfonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.