Process for purification of phosphate esters
US7759522B2 · kind B2 · utility
1Cited by
4References
6Claims
0Family size
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Key dates
| Filing date | Feb 8, 2002 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Mar 7, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A crude phosphate ester product can be purified by first washing it with chelating agent composition (such as a dilute acidic solution) and then, preferably, water, drying the resulting product, and then treating the resulting product with an acid scavenger, as exemplified by an epoxy-containing compound, such as 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexyl carboxylate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.