Membrane-Assisted Liquid-Phase Extraction of Lu(III) in a U-Shaped Contactor with a Single Hollow Fiber Membrane

Abstract

Extraction of Lu(III) from an aqueous LuCl 3 solution at pH 3.5 into an organic phase containing 5% (v/v) di(2ethylhexyl)phosphoric acid (DEHPA) in di-n-hexyl ether (DHE) immobilized within a polypropylene hollow fiber 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 fiber membrane, with stagnant acceptor phase in the lumen, immersed into a donor phase reservoir; and (ii) a U-shaped module containing a single hollow fiber membrane with a closedloop 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 cm 3 min −1 , the acceptor phase flow rate of 0.4 cm 3 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 Reynolds numbers of Re = 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 × 10 −5 m s −1 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 fiber.

Large-Scale Membrane- and Lignin-Modified Adsorbent-Assisted Extraction and Preconcentration of Triazine Analogs and Aflatoxins

“…Microscale membrane extraction has recently become the preferred option for sample preparation in numerous cases because of its simplicity, low operational costs, and high enrichment factors. Polytetrafluoroethylene- and PP-based fiber membranes are two of the most frequently used materials in these studies [ 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. However, the use of flat-sheet membranes constructed of these and other materials in large-scale liquid extraction and concentration under ambient temperature and pressure has not yet been documented.…”

Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

“…However, large numbers of fibers were not needed in the module because the mass transport behavior is identical for each fiber. A similar design, using only a single hollow fiber, was used by Kumrić et al (2012). The essential structural and physical parameters of the fiber were provided by the supplier (Table 1).…”

“…Thus, the simplest liquid-liquid extraction configuration is sufficient for purifying the PTA wastewater, and the PT acid does not need to be recovered from the extractant after NDSE. With the advantages of no emulsification and high extraction efficiency (Pabby and Sastre, 2013), NDSE has been used in many applications, including the chemical separation of pesticides (Đorđević et al, 2014), bisphenol A (Gupta et al, 2014), toluene (Barati et al, 2014), fermentation products , zinc chloride and hydrochloric acid (Lum et al, 2014), 1-butanol and acetone (Moreno et al, 2014), cephalexin (Hao et al, 2014), Co (Vernekar et al, 2013), Lu (Kumrić et al, 2012), U (Dixit et al, 2013), Zn (Samaniego et al, 2007), and Cu (Ren et al, 2008). However, there have been no published studies of NDSE applied to PTA wastewater.…”

Novel 90Sr–90Y generator system based on a pertraction through supported liquid membrane in hollow fiber contactor

“…' R E is the removal efficiency per single pass of the feed stream, and K D is the overall mass transfer coefficient based on the donor phase [21,28].…”

“…Membrane-assisted LLE has been used as an alternative to conventional LLE to achieve separation of a wide range of solutes including biological molecules [13,14], metal ions [15,16], organic pollutants [17,18] and radionuclides, such as 177 Lu and 137 Cs [19][20][21]. Supported liquid membrane (SLM) extraction is based on a three-phase system (pertraction) with an organic phase (liquid membrane) placed between two aqueous phases.…”