Kinetics of Lanthanide/Actinide Co-Extraction With N,n′-Dimethyl-N,n′-Dibutyltetradecylmalonic Diamide (Dmdbtdma)

Kinetics of Liquid/Liquid Extraction of Europium(III) Cation by Two Malonic Diamides

“…A first approach for the estimation of diffusive transport in a Lewis-type cell as used in references [5][6][7] is proposed. This simple model may give insight into the discrepancy between the results of references [6,7] and those of reference [8]. Moreover, the extraction kinetics of Eu(III) by DMDOHEMA are studied using the RMC at different temperatures.…”

“…In fact, it can result from a "slip effect" of the fluids on the blades of the propellers when their rotation speed is increased above some critical speed, [14] not from a kinetic regime in which the contribution from diffusive transport has been minimized. In contrast, the cell used by Weigl et al [8] is more reliable because it was devised by W. Nitsch in an effort to overcome the deficiencies of the Lewis cell. It possesses a more efficient stirring, capable of identifying the nature of the regime more reliably.…”

“…[6,7] On the other hand, the use of the Nitsch cell by Weigl et al pointed to a diffusion controlled process. [8] In view of these two opposite conclusions, it seemed desirable to further study this system with the use of a different technique in order to resolve the issue of the extraction regime.…”

“…However, it has not been studied extensively in the literature. This fundamental topic has been investigated by Toulemonde, [5] Dal Don, [6] Charbonnel et al, [7] and Weigl et al [8] in the case of DMDBTDMA, and by Bosland [9] in the case of DMDOHEMA.…”

“…Let us note that the cell was tested with systems operating in a diffusional regime. [8] In the case of the kinetics of extraction of Eu(III) with the diamide DMDBTDMA, the workers using the Lewis-type cell concluded that the transfer was controlled by a slow interfacial chemical reaction. [6,7] On the other hand, the use of the Nitsch cell by Weigl et al pointed to a diffusion controlled process.…”