BEGIN:VCALENDAR
PRODID:-//Columba Systems Ltd//NONSGML CPNG/SpringViewer/ICal Output/3.3-
 M3//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20160928T112136Z
DTSTART:20161012T120000Z
DTEND:20161012T130000Z
SUMMARY:Dalton Seminar Series: Interfacial Kinetic Studies of Advanced Sp
 ent Nuclear Fuel Recycle Processes
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}t6q-itmtncz
 c-60ieq4
DESCRIPTION:Nuclear power is of great importance to the future of low car
 bon energy production and the ability to separate and recover the actini
 de elements from spent fuel is a key requirement for a sustainable nucle
 ar fuel cycle. While the extraction of U and Pu for the fabrication of n
 ew fuel is well established with the PUREX process\, recovery of the act
 inides\, and their separation from the chemically similar lanthanides\, 
 remains challenging. \n\nA range of new organic extractant molecules\, s
 uch as N\,N\,N’\,N’’ tetraoctyl diglycolamide (TODGA)\, have been develo
 ped for the recovery of trivalent actinides through solvent extraction p
 rocesses in the context of advanced spent nuclear fuel recycle processes
  such as the GANEX and i-SANEX processes. For safe implementation at ind
 ustrial scale\, it is important that the ligands and their resultant f-b
 lock element complexes be well characterised with new understanding requ
 ired for the associated chemical extraction mechanisms and kinetics. \n\
 nConsequently\, a study of the interfacial and mass transport kinetics o
 f cerium extraction by TODGA has been conducted using a rotating diffusi
 on cell (RDC) apparatus. The RDC comprises two solution phases which are
  separated by a defined area membrane interface and subjected constant r
 otation. This rotation establishes controlled hydrodynamic flow and well
  characterised boundary / diffusion layer conditions within each solutio
 n phase\, facilitating the study of both diffusion and kinetic contribut
 ions to the rate of mass-transfer and the interrogation of the mechanism
  of extraction. \n\nStudies to date have revealed significant insights i
 nto the Ce(III) / TODGA extraction system\, indicating an interesting de
 pendency on local hydrodynamics at the solution phase boundary with the 
 key complexation reaction occurring in the aqueous phase. The extraction
  rate of Ce(III) has been shown to correlate with aqueous [Ce(III)] whil
 e the simultaneous extraction of HNO3 by TODGA is also demonstrated. The
  use of HNO3-pre-contacted TODGA indicates that the extraction of the ac
 id may be inhibitive towards the continued extraction of metal ions and 
 warrants further investigation.\n\nA theoretical description of the Ce(I
 II) / TODGA RDC system has been developed and combined with spectrometri
 c quantification of the interfacial flux allowing for the determination 
 of several key rate parameters including both the forward / complexation
  and back / decomplexation reaction rates\, the aqueous decomplexation l
 ength and the interfacial rate constant.\n
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:G.54\, Chemistry Building\, Manchester
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