Process for the purification of phosphorus oxychloride
US5993609A · kind A · utility
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8Claims
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Key dates
| Filing date | Sep 2, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Sep 2, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/13
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A process for the purification of recovered or regenerated phosphorus oxychloride contaminated by reactive organic compounds, by reacting the contaminated phosphorus oxychloride with from 0.1 to 5% by weight of an organic amine, having 1 or 2 tertiary N-atoms and a boiling point above the boiling point of phosphorus oxychloride, at the boiling temperature of the reaction mixture and subsequently carrying out fractional distillation at atmospheric pressure to obtain purified phosphorus oxychloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.