Kinetic behavior of lanthanide extraction with acidic phosphorus extractants
Conference
·
OSTI ID:126616
- Univ. of Arizona, Tucson, AZ (United States); and others
The kinetics of the formation of the complexes of tervalent lanthanides with several organophosphorus extractants in the octane-H{sub 2}O phase pair have been characterized by competition kinetics. The kinetic studies were conducted by the extraction of the EDTA complexes of Y{sup 3+}, Nd{sup 3+}, Gd{sup 3+}, Ho{sup 3+} and Lu{sup 3+} by bis(2-ethylhexyl)phosphoric acid (HDEHP), 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) and bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272) in octane. The observed rate constants bore an inverse relationship to the stability constants of the metal-EDTA complexes. For a given metal the rate constants as a function of ligand followed the order HDEHP > HEH[EHP] > Cyanex 272. The mechanistic details of the competition kinetics and the implications of the kinetic results will be discussed.
- OSTI ID:
- 126616
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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