Production of organic solvent solutions of rare-earth organophosphates
US8404821B2 · kind B2 · utility
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Key dates
| Filing date | Jul 8, 2008 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Aug 18, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/4084
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Solutions of rare-earth organophosphates in an organic solvent are prepared by reacting, in such solvent, a rare-earth compound selected from among the rare-earth oxides, hydroxides, carbonates and hydroxycarbonates with an organophosphorus acid and in the presence of a reaction promoter selected from among water, nitric, hydrochloric, acetic, formic and propionic acids and the rare-earth salts of these acids; utilizing a reaction promoter simplifies the method, reduces the reaction time and provides a solution in which the residual solids content may be low.
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