The solvent extraction of zinc, cadmium and chromium from phosphoric acid solutions by tri-n butyl phosphate in kerosene diluent
作者： Abdelhamid Mellah , Djafer Benachour
DOI: 10.1016/J.SEPPUR.2007.01.037
关键词: Enthalpy 、 Inorganic chemistry 、 Phosphoric acid 、 Diluent 、 Tri-N-butyl Phosphate 、 Phosphate 、 Cadmium 、 Chemistry 、 Zinc 、 Chromium
摘要: Abstract In this paper, the solvent extraction of zinc(II), cadmium(II) and chromium(III) from phosphoric acid solutions by tri- n butyl phosphate (TBP) in kerosene as diluent was investigated. The distribution coefficients were determined results showed clearly a maximum values at 5.5 mol/L H 3 PO 4 concentration minimum 1.0 mol/L concentration. apparent standard molar enthalpies Δ ° for found to be, respectively, 51.11, 45.43 59.87 kJ/mol which indicate endothermic nature process. entropies S also 1.685 × 10 −3 , 1.377 × 10 1.961 × 10 kJ/mol K. Gibbs free energies G consequently calculated. Based on regression analysis data, equations prediction D chromium(III), respectively obtained.
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