| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 04.00 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
- Contacting an impure tetra(dihydrocarbylamino)phospho nium halide with liquid cyclic ether under conditions effective to dissolve the tetra(dihydrocarbylamino)phosphonium ha lide (I) & leave at least a portion of said impurities compri sing at least quat ammonium halide or an amidophospho xide remaining in the solid state - Separating the solids & the liquid phase of a) from each other - Mixing an anhydrous non-solvent for the (I) with the liquid phase from b) to precipitate the (I); & - Separating the precipitated (I) solids & the liquid phase of c) from each other |
| PATENT PHOTOCOPY | Available on request |
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