Abstract
The equilibrium performance and kinetic behavior of copper extraction from nitrate media were studied with two organic solutions, one containing 2-hydroxy-5-nonylbenzophenone oxime and the other containing the oxime together with bis(2-ethylhexyl)phosphoric acid (HDEHP). HDEHP, added in quantities up to 10 mol/m/sup 3/ in xylene and 1 mol/m/sup 3/ in n-heptane diluents, has been found to have little influence on the extraction performance of th oxime. The addition of small amounts of HDEHP results in a considerable increase in both extraction and stripping rates, but the data in xylene and n-heptane show different trends. A scheme for the reaction between the copper and the oxime containing HDEHP is proposed which interprets HDEHP as a phase-transfer catalyst.
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