Solvent Extraction of Rare Earth and Precious Metals with Quaternary Ammonium Type of Calix[4]arene

概要

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<I>p</I>-t-Calix [4] arene with quaternary ammonium groups at upper rim has been prepared to investigate solvent extraction behavior of trivalent rare earth metals in nitrate media and precious metals in chloride media. Rare earth metals are extracted as nitrate anion complex underr a neutral condition of high nitrate concentration. Although Calix [4] arene derivative has poor extraction ability compared with the corresponding monomeric analog and the commercial quaternary ammonium extractant due to not all but partial coordination of four quartenary ammonium groups and mismatching of nitrate anion complex to coordination site. Calix [4] arene derivative shows enhanced extractability to palladium and platinum due to the effect of its cyclic and rigid structure. They are extracted as chloroanion complex at high concentration of hydrochloric acid.
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