Extraction Kinetics of Molybdenum with 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester in Membrane Extractor Using a Hollow Fiber

Abstract

The extraction rate of molybdenum with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester dissolved in n-heptane was measured at 303 K by using a membrane extractor made of a hollow fiber. The results were explained by a diffusion model with interfacial reaction, taking account of the laminar velocity distributions of the aqueous and organic solutions in the membrane extractor.
In the region of high pH, the extraction rate was interpreted by taking account of both the cationic and nonionic species of molybdenum as the reacting species.