Process for producing phosphoric ester salt of high purity
US4739092A · kind A · utility
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2References
4Claims
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Key dates
| Filing date | Nov 19, 1986 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Nov 19, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/09
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A phosphoric ester salt of high purity is produced by converting a phosphoric ester in a mixture containing the phosphoric ester and one or more nonionic compounds into a phosphoric ester salt by using a basic compound, and extracting nonionic compounds from the above mixture by using a mixed solvent of aliphatic hydrocarbons or cycloaliphatic hydrocarbons, a lower alcohol and water. The above method is applicable to a non-crystalline phosphoric ester from which nonionic compounds cannot be removed by recystallization. The above obtained phosphoric ester salt of high purity can be used as it is or after condensation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.