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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received September 24, 2002
Accepted March 5, 2003

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Synergistic Extraction and Separation of Mixture of Lanthanum and Neodymium by Hollow Fiber Supported Liquid Membrane

Ramakul Prakorn Pancharoen Ura^†

Department of Chemical Engineering, Chulalongkorn University, Payatai Road Bangkok, Thailand

Prakorn.Ra@student.chula.ac.th

Korean Journal of Chemical Engineering, July 2003, 20(4), 724-730(7), 10.1007/BF02706915

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Abstract

Separation of lanthanum and neodymium by supported liquid membrane has been studied. Synergistic extraction and recovery of lanthanum and neodymium with thenoyltrifluoroacetone (HTTA) in benzene have been found by the addition of Trioctylamine (TOA). Results indicate that percentage of extraction is highly dependent on pH of feed solution, which the maximum value is 2.5. When TOA was added to HTTA, the percentage of extraction and recovery considerably increased due to synergism. Lanthanum can be extracted and recovered more than neodymium_x000D_ because of the adduct formation constant, β1. The β1 values decreased with an increase in atomic number of lanthanide and showed a difference between lanthanum and neodymium. Percentage of extraction and recovery is enhanced when the HTTA concentration is increased, but its difference is larger when TOA concentration is increased. Finally, multi-column module of supported hollow fiber membrane was used and the percentage and difference of extraction_x000D_ and recovery was found to be more increased due to resident time.

Keywords

Liquid Membrane Synergistic Extraction Recovery Hollow Fiber

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