Effect of structure of N,N dialkyl amides on the extraction of U(VI) and Th(IV): a thermodynamic study

P.N. Pathak; L.B. Kumbhare; V.K. Manchanda

doi:10.1524/ract.2001.89.7.447

Published by De Gruyter (O) September 25, 2009

Effect of structure of N,N dialkyl amides on the extraction of U(VI) and Th(IV): a thermodynamic study

P.N. Pathak , L.B. Kumbhare and V.K. Manchanda

From the journal Radiochimica Acta

https://doi.org/10.1524/ract.2001.89.7.447

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The temperature effect on the extraction behaviour of U(VI) and Th(IV) from 3 M HNO₃ employing 1 M solutions of N,N diallkyl amides with varying alkyl substituents on the C_α atom viz. di(2-ethylhexyl)acetamide (D2EHAA), di(2-ethylhexyl)propionamide (D2EHPRA), di(2-ethylhexyl)isobutyramide (D2EHIBA) and di(2-ethylhexyl)pivalamide (D2EHPVA) in n-dodecane has been investigated. These studies indicate that the extraction reactions of U(VI) and Th(IV) are enthalpy stabilised while the entropy factor counteracts the extraction. An attempt has been made to correlate the thermodynamic parameters with the structure of the extractant molecules.

Published Online: 2009-9-25

Published in Print: 2001-7-1

Effect of structure of N,N dialkyl amides on the extraction of U(VI) and Th(IV): a thermodynamic study

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