ABSTRACT
This chapter is concerned with extraction processes other than transuranic extraction (TRUEX) based and other than crown ether based process. Metal chelation is produced by electron pair sharing between groups in the ligand and the metal ion. The acidic group loses a proton, becoming an anion donor, and the basic nitrogen or phosphorus-oxygen group donates a pair of electrons to metal ion. The TRUEX monofunctional extractant octyl (phenyl)-N, N-diisobutylcarbamoyl methylphosphine oxide is another member of this carbamoyl-phosphoryl family of extractants. The monofunctional agent dibutylbutyl phosphonate is a powerful extractant for americium (III) from low acid solutions, with high nitrate concentrations. The feed is conditioned by adding lactic and diethylenetriaminepentacetic acids. In the first part of the process, trivalent lanthanides are extracted by di (2-ethylhexyl)-phosphoric acid leaving the trivalent actinides in the aqueous phase. The most important beta-diketones are acety lacetone, benzoylacetone, dibenzoylmethane, and thenotrifluoracetone.
