Co-Extraction of U(VI) and HNO3 Using TBP and its Higher Homologues TiAP and TEHP: Comparison of Equilibria,Kinetics, and Rate of Extraction |
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| Authors: | Diptendu Das V. A. Juvekar S. B. Roy R. Bhattacharya |
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| Affiliation: | 1. Department of Chemical Engineering, Indian Institute of Technology, Bombay, Indiadiptendudas@iitb.ac.in;3. Department of Chemical Engineering, Indian Institute of Technology, Bombay, India;4. Uranium Extraction Division, Bhabha Atomic Research Centre, Mumbai, India;5. Atomic Energy Regulatory Board, Mumbai, India |
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| Abstract: | In this work, bulk-liquid membrane (BLM) system is used to compare tri-n-butyl phosphate (TBP), tri-isoamyl phosphate (TiAP), and tris(2-ethylhexyl) phosphate (TEHP) for their relative ability to co-extract U(VI) and nitric acid from aqueous nitric acid feed-phase into water strip-phase, through hydrocarbon membrane-phase. The kinetics of extraction is modelled and the model is validated through experiments. The quantity which determines the efficiency of liquid emulsion membrane (LEM) process is the relative rate of extraction of U(VI) to nitric acid. This is in the order TiAP>TEHP>TBP, indicating that TiAP is most suitable for extraction of U(VI) from nitric acid using LEM. |
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| Keywords: | co-extraction U(VI) nitric acid TBP TiAP TEHP bulk liquid membranes liquid emulsion membranes |
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