Purification of bidentate organophosphorous extractants
US5001250A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 1989 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | May 30, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/5304
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Crude N,N-dialkylcarbamoylmethylphosphonates and phosphine oxide extractants, and particularly crude dihexyl N,N-diethylcarbamoylmethylphosphonate and octylphenyl N,N-diisobutylcarbamoyl phosphine oxide, are purified by distilling the crude materials in a thin film evaporator. Preferably, the crude dihexyl N,N-diethylcarbamoylmethylphosphonate is reacted with concentrated hydrochloric acid and subsequently reacted with aqueous sodium hydroxide prior to distillation in the thin film evaporator to hydrolyze impurities contained in the crude product. The purified extractants are useful for extracting actinides and lanthanides from liquid waste streams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.