Modeling on the Counteractive Facilitated Transport of Co in Co–Ni Mixtures by Hollow-Fiber Supported Liquid Membrane

Abstract

The separation of cobalt from mixed solutions of cobalt and nickel sulfate through the hollow-fiber supported liquid membrane using 2-ethylhexylphosphonic acid mono-2 ethylhexyl ester as a carrier has been studied. A mathematical model was developed to analyze the permeation of cobalt in the competitive permeation of cobalt and nickel. The model was based on the continuity equation and considered not only the cotransport of cobalt and nickel, but also the counter-transport of hydrogen ions. The concentrations in the stripping solution were taken into account in the model as well as the concentrations in feed solution and liquid membrane. The experimental results were in good agreement with the model.

Active Facilitated Transport and Separation of Co in Co–Ni Sulfate Solution by Hollow Fiber Supported Liquid Membrane Containing HEH(EHP)

“…As stated in detail in our previous paper, [17] the increase in Their feed concentrations are [Co þ2 ] F and [Ni þ2 ] F .…”

“…[17] The HF-SLM was prepared by flowing the organic solution through the tube side of fibers and soaking the microporous fiber walls for at least 30 min. Commercial EP grade kerosene from Junsei Chemical Co. was used as the diluent.…”

“…Under the lamina flow conditions, the increase of flow rate enhances the permeation rate of cobalt. [17] Separation and Enrichment in the Strip Solution Figures 7 and 8 show the separation factor of cobalt with flow rates at various pH of the feed solution and carrier concentration. The fast flow reduces the concentration gradient between the bulk solution and the interface by compensating cobalt instantaneously.…”

“…Chaudry et al [11] investigated the extraction of cobalt by flat-sheets supported liquid membrane (FS-SLM) containing bis(2-ethylhexyl) phosphoric acid (D2EHPA) as a carrier and reported ORDER REPRINTS the dependence of the complexation reaction rates and diffusion resistance on temperature with which the permeability of cobalt increases. [16,17] In the present study, the active facilitated transport and separation of cobalt from mixed solution of cobalt and nickel sulfate were investigated using HF-SLM from Hoechst Celanese Corporation. The FS-SLM, including the works mentioned previously, has been widely employed in the separation of cobalt.…”

Separation of Co(II) and Li(I) by supported liquid membrane using Cyanex 272 as mobile carrier

“…The SLMs have non-equilibrium mass-transfer characteristics where the separation is not limited by the conditions of equilibrium. The separation processes like Co-Ni [10][11][12][13], Co-Zn [14], and Co-Mn [15] have also been investigated by SLM technique. Several extractants such as D2EHPA [6][7][8]14,15], PC88A [15], LIX84 [16], and Cyanex 921 [17], etc.…”