Abstract
The multistage extraction of metal ion was studied by a centrifuge extractor, in which oil and water were flown counter-currently through the narrow gap between a rotated inner cylinder and a static outer cylinder. Oil (dodecane) was dispersed finely by increasing the rotating speed of inner cylinder and flown up against the downflow of water. The small drops of dispersed oil were sucked down by Taylor vortices accumulated on the inner-cylinder surface. Stable belt-shaped structures of oil phase were observed at even intervals on the surface of inner cylinder. The extraction of Zn(II) with di-2-ethylhexylphosphoric acid dissolved in dodecane was examined. The extraction of Zn was promoted by the increase of oil hold-up and the improvement of oil dispersion, which were observed by increasing the rotating speed of inner cylinder and the flow rates of oil and water. The number of theoretical stages was evaluated as about 3 stages under the conditions that the rotating speed and the flow rates of oil and water were given as 1200 rpm and 17 ml/min, respectively. The multistage extraction was achievable successfully by the proposed centrifuge extractor with Taylor-Couette flow.
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