Ind. Eng. Chem. Res. 2009, 48, 2781–2785
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High-Temperature Conductivity Measurements of Concentrated NaCl-H2SO4-H2O Solutions up to 250 °C Ming Huang and Vladimiros G. Papangelakis* Department of Chemical Engineering and Applied Chemistry, UniVersity of Toronto, 200 College Street, Toronto, Canada M5S 3E5
An electrodeless conductivity cell was employed to investigate the electrical conductivity of concentrated NaCl-H2SO4-H2O solutions particularly at high temperatures. All solutions were measured from 25 to 250 °C at the equilibrium vapor pressures. The maximum measured concentrations of NaCl and H2SO4 were 0.40 and 0.45 m, respectively. At 250 °C and a fixed concentration of H2SO4, the conductivity of NaCl-H2SO4-H2O solutions increases with the increasing concentration of NaCl. Similarly, at 250 °C and a fixed concentration of NaCl, the conductivity of NaCl-H2SO4-H2O solutions increases with the increasing concentration of H2SO4. It was found that the ionic equivalent conductivity of H3O+ is a function of ionic strength at 250 °C and is independent of the solution speciation. Introduction To obtain dissociation constants at high temperatures and evaluate the performance of activity models, a lot of work has been done on the electrical conductivities of binary H2SO4-H2O and binary NaCl-H2O systems.1-3 However, most of the effort was focused on dilute solutions with a single electrolyte, either H2SO4 or NaCl (
