Process for the preparation of sulphonates
US5789615A · kind A · utility
1Cited by
2References
10Claims
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Key dates
| Filing date | Apr 8, 1997 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Apr 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sulphonates are prepared by the neutralisation of a sulphonic acid with a basic hydroxide or oxide. The process requires the staged addition of sulphonic acid to a reaction mixture comprising basic hydroxide or oxide dispersed in a water/diluent mixture; the reaction mixture is basic throughout the additions of acid and at least until the point of completion of the neutralisation reaction. The basic hydroxide or oxide may also be added in stages. The sulphonate product has low viscosity, low haze and good stability and is essentially chloride free as halide promoters are not utilised in the manufacture of the product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.