Essentially pure/colorless P.sub.2 NOCl.sub.5
US4902490A · kind A · utility
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3References
4Claims
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Key dates
| Filing date | Mar 10, 1988 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Mar 10, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/097
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Essentially pure and colorless N-(dichlorophosphoryl)trichlorophosphazene [P.sub.2 NOCl.sub.5 ] is prepared/purified under relatively moderate conditions, by reacting phosphorous pentachloride with ammonium chloride, treating the resulting medium of reaction, containing P.sub.3 NCl.sub.12, with SO.sub.2, and thin film evaporating the medium of reaction, advantageously in two stages, to eliminate SO.sub.2, POCl.sub.3 and SOCl.sub.2 values therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.