Synthesis of rare earth metal extractant
US8889903B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Jul 5, 2011 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Jul 5, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in an aprotic polar solvent, with a molar ratio of dialkylamine to diglycolic anhydride being at least 1.0, and removing the aprotic polar solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.