Study of kinetics, equilibrium and isotope exchange in ion exchange systems

Plicka, J.; Ştamberg, K.; Cabicar, J.; Gosman, A.

doi:10.1007/bf02047927

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…The modelling of the time dependent separation of two components having similar chemical properties in a liquid-liquid extraction system, is based on the findings obtained in the kinetic studies of isotope systems [5][6][7][8] as well as non-isotope systems [9][10][11][12]. The timedependent kinetic separation effect then exists in the two-phase system as a result of the antagonistic action of two processes:…”

Section: Kinetic Model Of the Time-dependent Separation Factor Sf(t)mentioning

confidence: 99%

“…[13,14], then there are two mass transfer rate equations of type Eq. (2)see Eqs (9) and (10). The third one is the rate equation describing the reversible chemical reaction of the 2 nd ordersee Eqs.…”

Section: Kinetic Model Of the Time-dependent Separation Factor Sf(t)mentioning

confidence: 99%

“…Therefore, the system can be described by differential equations (10) and 12, where equation 12is the sum of differential equations (9) (see rAm) and 11…”

Section: Kinetic Model Of the Time-dependent Separation Factor Sf(t)mentioning

confidence: 99%

“…from 1.020 to 1.040even for systems that converge to α=1.001-1.000 at equilibrium [7,8] . This principle was experimentally verified in study of the kinetics of uranium isotope separation by uranium extraction into tri-n-octyl-amine (TOA) and tri-n-butyl-phosphate [7], by uranium sorption onto both cation and anion exchangers [5][6][7][8], or in the study of the kinetics of ion exchange in the ternary systems Na + -Co 2+ -Ni 2+ + strong-acid cation exchanger [9], or Na + -Mg 2+ -UO2 2+ + strong-acid cation exchanger [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Am + (corg)Cm ↔ (corg)Am + (caq)Cm(10) The corresponding first order rate equations are defined above (Eqs (2) -(5)) for americium;…”

mentioning

confidence: 99%

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Modelling of the Am(III) – Cm(III) kinetic separation effect observed during metal ion extraction by bis-(1,2,4)-triazine ligands

Distler

Ştamberg

John

et al. 2017

Separation Science and Technology

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The kinetic separation effect was observed leading to a separation factor for Am(III) over Cm(III) as high as 7.9 by using 2,9-bis-(1,2,4-triazin-3-yl)-1,10-phenantroline (BTPhen) ligands in our recent study. In an attempt to explain the observed tendencies, several kinetic models were tested. A model based on mass transfer as the rate-controlling process was found to best describe the kinetic data and allowed to simulate the dependence of Am/Cm separation factor on time. The calculated values of the overall mass-transfer coefficients confirmed that the observed kinetic effect was caused by the different rates of Am(III) and Cm(III) extraction. This kinetic separation phenomenon and its explanation paves the way for potential new approaches to separation of metal ions with very similar properties, such as the adjacent minor actinides Am(III) and Cm(III).

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Section: Kinetic Model Of the Time-dependent Separation Factor Sf(t)mentioning

confidence: 99%

Section: Kinetic Model Of the Time-dependent Separation Factor Sf(t)mentioning

confidence: 99%

“…Therefore, the system can be described by differential equations (10) and 12, where equation 12is the sum of differential equations (9) (see rAm) and 11…”

Section: Kinetic Model Of the Time-dependent Separation Factor Sf(t)mentioning

confidence: 99%