Process of selective desulfonation
US5741954A · kind A · utility
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1References
3Claims
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Assignee
Inventors
Key dates
| Filing date | Jul 19, 1995 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Jul 19, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a process for the preparation of m-alkylphenols, particularly of 3-ethylphenol, from the mixture of alkylbenzenesulfonic acid isomers by selective desulfonation, removal of formed alkylbenzene and caustic fusion. In the present invention the inventive desulfonation is accomplished by addition of steam to the mixture of sulfonic acid in an excess in relation to the amount of evaporable water, simultaneously maintaining the temperature of the mixture above 160.degree. C. until the desired purity of isomers is obtained, and until the content of the sulfuric acid in the mixture is decreased below 40%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.