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Title: Membrane-assisted liquid phase extraction of Lu(III) in U-shaped contactor with a single hollow fibre membrane under recirculation mode of operation
Authors: Kumric, Ksenija R.
Vladisavljevic, Goran T.
Trtic-Petrovic, Tatjana M.
Keywords: Membrane extraction
Supported liquid membrane
Issue Date: 2012
Publisher: © American Chemical Society
Citation: KUMRIC, K.R., VLADISAVLJEVIC, G.T. and TRTIC-PETROVIC, T.M., 2012. Membrane-assisted liquid phase extraction of Lu(III) in U-shaped contactor with a single hollow fibre membrane under recirculation mode of operation. Industrial and Engineering Chemistry Research, 51 (43), pp. 14199 - 14208.
Abstract: Extraction of Lu(III) from an aqueous LuCl3 solution at pH 3.5 into an organic phase containing 5% (v/v) di(2-ethylhexyl)phosphoric acid (DEHPA) in di-n-hexyl ether (DHE) immobilized within a polypropylene hollow fibre membrane and a simultaneous back-extraction of Lu(III) into 2 mol dm-3 HCl solution has been investigated using two miniaturized supported liquid membrane (SLM) systems: (i) a single hollow fibre membrane, with stagnant acceptor phase in the lumen, immersed into a donor phase reservoir; (ii) U-shaped module containing a single hollow fibre membrane with a closed-loop recirculation of aqueous phases through the module. In the stagnant SLM system, the maximum extraction efficiency was 8.8% due to limited acceptor volume and absence of flow within the lumen. In recirculating SLM system, after 80 min of operation at the donor phase flow rate of 5.3 cm3 min-1, the acceptor phase flow rate of 0.4 cm3 min-1 and the donor-to-acceptor phase volume ratio of 6.7, the equilibrium removal efficiency of Lu(III) reached 88% and less than 5% of Lu(III) extracted from the feed solution was kept in the organic phase. For shell side flow of the donor phase at the Reynolds number of 3−34, the overall mass transfer coefficient was proportional to the donor flow rate raised to the power of 0.63 and increased from 2.3 to 8.8 × 10-5 m s-1. The rate-limiting step was the mass transfer of Lu(III) within the boundary layer of the donor phase adjacent to the outer wall of the hollow fibre.
Description: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Industrial and Engineering Chemistry Research [© American Chemical Society] after peer review and technical editing by the publisher. To access the final edited and published work see: http://dx.doi.org/10.1021/ie301887h
Version: Accepted for publication
DOI: 10.1021/ie301887h
URI: https://dspace.lboro.ac.uk/2134/10865
Publisher Link: http://dx.doi.org/10.1021/ie301887h
ISSN: 0888-5885
Appears in Collections:Published Articles (Chemical Engineering)

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