Process for making alkaline-earth metal salts of alkaryl sulfonic acids
US4615841A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1985 |
| Grant date | Oct 7, 1986 |
| Priority date | — |
| Expiry date | Apr 25, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C309/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel process for making solutions of alkaline-earth metal salts of alkaryl sulfonic acids that contain about 1.5 to less than three weight percent water and that does not require an azeotropic distillation step to reduce the water of the reaction product to this level, comprises reacting an alkaryl sulfonic acid with alkaline-earth metal oxide in an organic solvent in the presence of 0.05 to less than 2.5 weight percent water. Calcium oxide, alkylbenzene sulfonic acids wherein the alkyl groups contain 10 to 14 carbon atoms, solvent mixtures of lower alkanols and non-polar hydrocarbon solvents all are representative of materials useful in the process of the invention, wherein the alkyl benzene sulfonic acid is preferably proportioned into a mixture of the other reactants and the water is supplied in admixture with a small amount of a calcium alkylbenzene sulfonate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.