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Analysis of the mechanism of rare earth metal permeation through a liquid membrane with a chelating agent in the
Author(s) -
Kojima Toshinori,
Nakayama Chikako,
Uemiya Shigeyuki
Publication year - 1994
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450720111
Subject(s) - permeation , chelation , phosphoric acid , chemistry , stripping (fiber) , membrane , metal ions in aqueous solution , selectivity , metal , inorganic chemistry , phase (matter) , rare earth , nuclear chemistry , chromatography , organic chemistry , materials science , mineralogy , biochemistry , composite material , catalysis
The effect of adding a water‐soluble chelating agent, diethylenetriaminepentaacetic acid (DTPA), to the feed phase was studied on the selective permeation of rare earth metal ions (Ln 3+ ) through a supported liquid membrane (SLM) containing 2‐ethylhexyl phosphoric acid mono‐2‐ethylhexyl ester (PC‐88A). High selectivity of Pr to Nd was observed at a pH of 2.0 in the stripping phase, and selective permeation of La was observed at higher pH values. The permeation mechanism of the Ln 3+ was analyzed, and the above results were explained by the change in the concentrations of free Ln 3+ in the feed phase and Ln 3+ /PC‐88A complexes in the SLM with pH.