Purified sulfonated organophosphorus compounds and catalysis of organic reactions therewith
US6613939B2 · kind B2 · utility
5Cited by
5References
11Claims
0Family size
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Key dates
| Filing date | Jun 25, 2001 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Jun 25, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Water-soluble sulfonated organophosphorus compounds are purified by at least partially removing contaminating sulfite values therefrom, by decreasing the pH of a solution of such sulfonated organophosphorus compounds to a value of less than or equal to 4, and maintaining the pH of the solution at this value of 4 or less for such period of time as to reduce the weight concentration of sulfite in the solution to less than 100 ppm; the organophosphorus compounds thus purified are well suited for the two-phase cocatalysis of a wide variety of organic reactions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.