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R. A. Kumbasar, “Selective Extraction and Concentration of Cobalt from Acidic Leach Solution Containing Cobalt and Nickel through Emulsion Liquid Membrane Using PC 88A as Extractant,” Separation and Purification Technology, Vol. 64, No. 3, 2009, pp. 273-279. doi:10.1016/j.seppur.2008.10.011

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• TITLE: Extraction Kinetics of Ni(II) in the Ni2+- SO42--Ac-(Na+, H+)-Cyanex 272 (H2A2)-Kerosene-3% (v/v) Octan-1-ol System Using Single Drop Technique

  AUTHORS: Ranjit Kumar Biswas, Aneek Krishna Karmakar, Muhammad Saidur Rahman

  KEYWORDS: Kinetics; Cyanex 272; Sulphate; Kerosene; Ni2+; Single Drop Technique

  JOURNAL NAME: International Journal of Nonferrous Metallurgy, Vol.2 No.2, April 29, 2013

  ABSTRACT: The kinetics of extraction of Ni(II) in the Ni2+-SO4 2_AC- (Na+, H+)-Cyanex 272 (H2A2)-kerosene-3% (v/v) octan-1-ol system using the single falling drop technique have been reported. The flux of Ni2+ transfer (F) at 303 K in presence of 3% (v/v) octan-1-ol (de-emulsifier) can be represented as:.Depending on reaction parameters, the activation energy (Ea) and enthalpy change in activation (DH±) varies within 17 - 58 kJ/mol and 17 - 67 kJ/mol, respectively. Entropy change in activation (DS±) is always negative. Based on the empirical flux equation, Ea and DS± values, mechanisms of extractions in different parametric conditions are proposed. At low and [Ac-], and pH, the chemical controlled step is: Ni2+ + A- → NiA+; and this reaction occurs via an SN2 mechanism. But in most parametric conditions, the process is under intermediate control; and at high SO42- and [Ac-], and pH, the extraction process is under diffusion control.