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Title: Transport of Pu(IV) across supported liquid membrane from nitric acid medium using cyanex -923 as the mobile receptor
Authors: Sawant, S R
Sonawane, J V
Pabby, Anil Kumar
Venugopalan, A K
Dey, P K
Venkataramani, B
Keywords: Pu(IV) transport;FSSLM;Mobile receptor;Cyanex 923/dodecane;HFSLM;CSLMFC
Issue Date: Jul-2004
Publisher: NISCAIR-CSIR, India
IPC Code: C22B 60/04
Abstract:     Based on the solvent extraction data, experiments were conducted with Flat-sheet Supported Liquid Membrane (FSSLM) to examine the transport behaviour of Pu(IV) to achieve its maximum recovery. This is necessary to optimize the conditions for further operation of Hollow Fiber Supported Liquid Membrane (HFSLM) and Compact Supported Liquid Membrane Flow Cell (CSLMFC). A laboratory scale hollow fiber module, having membrane surface area, 134 cm2, was employed in a recycling mode using 'Enka' Accurel hollow fiber polypropylene membranes as the solid support, cyanex-923 as the mobile receptor and dodecane as the membrane solvent. Dilute plutonium nitrate solutions in 1M HNO3 generally constituted the source phase. Among the strippants, several reagents were tried, the most efficient strippant found was dilute uranous solution in 1.0 M HNO3. The recovery of Pu from the Pu oxalate supernatant generated during Pu reconversion operations in the PUREX process was tried, where it was observed that ~94% of Pu(IV) could be transported in a single run of duration of 10 h, while employing 0.1 M cyanex-923/dodecane as a mobile receptor and uranous solution in 1.0 M HNO3 as the strippant. Parameters such as source phase concentration, source and strippant phase recirculation flow rate, concentration of carrier in the membrane and strippant, and interferences of other permeants on plutonium permeation pertaining to FSSLM, HFSLM and CSLMFC were optimized.
    This followed the utilization of more application oriented configuration i .e. Hollow fiber membrane configuration for the above purpose.
    With HFSLM, the Kobs values increased from 3.06×10-5 to 6.27 × 10-5 s-1 by increasing now rate from 0.03 × 10-6 to 0.14×10-6 m3/s at 1 h and the percentage permeation increased from 75 to 90%. In the case of CFSLMC, the Kobs increased from 5.41 × 10-5 to 5.74× 10-5 s-1  while increasing flow rate from 0.27× 10-6 to 0.42×10-6 m3/s at 1 h and the percentage permeation increased from 65 to 85% .
Page(s): 548-554
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.11(4) [July 2004]

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