TY - JOUR
T1 - Extraction of Rare Earth Metals Using Liquid Surfactant Membranes Prepared by a Synthesized Surfactant
AU - Uezu, Kazuya
AU - Goto, Masahiro
AU - Ikemizu, Kiyoshi
AU - Nakashio, Fumiyuki
AU - Irie, Shinji
N1 - Funding Information:
This work was supported by Grants-in-Aid for Scientific Research (No. 05453103) from the Ministry of Education, Science and Culture of Japan. The authors are grateful to Daihachi Chemical Industry Co., Ltd., for the supply of extractant PC-88A.
PY - 1995/10/1
Y1 - 1995/10/1
N2 - Three surfactants, L-glutamic acid dioleyl ester ribitol (nonionic, 2C18Δ9GE), L-glutamic acid dioleyl ester quaternary ammonium chloride (cationic, 2C18Δ9GEC2QA), and dioleyl dimethyl quaternary ammonium chloride (cationic, 2C18Δ9QA) were synthesized for potential use in liquid membrane operations. These surfactants have strongly hydrophobic, twin oleyl chains as the hydrophobic moiety. Using the synthesized surfactants, extraction of rare earth metals was carried out by liquid surfactant membranes in a stirred tank. The extraction behavior of 12 kinds of rare earth metals was systematically studied with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (commercial name: PC-88A) as a carrier. Different surfactants having an identical hydrophobic moiety can have significantly different behaviors in rare earth extractions by liquid surfactant membranes, where extraction efficiency appears to be governed by the nature of the interfacial microenvironment between oil and water. An interfacial reaction model which takes into account the adsorption of a surfactant at the interface has been proposed to evaluate the permeation rate of rare earth metals by liquid surfactant membranes. It was found that a cationic surfactant strongly enhances the extraction rate of rare earth metals compared with the conventional surfactant, Span 80. The cationic surfactant 2c18Δ9GEC2QA appears to be one of the best surfactants currently available for rare earth extraction by liquid surfactant membranes.
AB - Three surfactants, L-glutamic acid dioleyl ester ribitol (nonionic, 2C18Δ9GE), L-glutamic acid dioleyl ester quaternary ammonium chloride (cationic, 2C18Δ9GEC2QA), and dioleyl dimethyl quaternary ammonium chloride (cationic, 2C18Δ9QA) were synthesized for potential use in liquid membrane operations. These surfactants have strongly hydrophobic, twin oleyl chains as the hydrophobic moiety. Using the synthesized surfactants, extraction of rare earth metals was carried out by liquid surfactant membranes in a stirred tank. The extraction behavior of 12 kinds of rare earth metals was systematically studied with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (commercial name: PC-88A) as a carrier. Different surfactants having an identical hydrophobic moiety can have significantly different behaviors in rare earth extractions by liquid surfactant membranes, where extraction efficiency appears to be governed by the nature of the interfacial microenvironment between oil and water. An interfacial reaction model which takes into account the adsorption of a surfactant at the interface has been proposed to evaluate the permeation rate of rare earth metals by liquid surfactant membranes. It was found that a cationic surfactant strongly enhances the extraction rate of rare earth metals compared with the conventional surfactant, Span 80. The cationic surfactant 2c18Δ9GEC2QA appears to be one of the best surfactants currently available for rare earth extraction by liquid surfactant membranes.
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U2 - 10.1080/01496399508013148
DO - 10.1080/01496399508013148
M3 - Article
AN - SCOPUS:0029390019
SN - 0149-6395
VL - 30
SP - 3325
EP - 3338
JO - Separation Science and Technology
JF - Separation Science and Technology
IS - 17
ER -