The kinetics of dissolved oxygen reaction in aqueous sodium dithionite solutions

Authors

  • Mikio Kawagoe,

    1. Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1
    Current affiliation:
    1. Department of Chemical Engineering, Nara Technical College, Nara, Japan
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  • Campbell W. Robinson

    Corresponding author
    1. Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1
    • Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1
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Abstract

The kinetics of the reaction between dissolved oxygen and sodium dithionite in alkaline aqueous solution was investigated in a stirred cell. For dithionite concentrations below 0.08 kmol/m3 and sodium hydroxide concentrations from 0.044 to 0.27 kmol/m3, the results show the reaction to be first order in dithionite and zero order in oxygen. The Arrhenius activation energy was determined to be 76.2 MJ/kmol in the temperature range 15 to 34°C. Addition of other electrolytes (sodium sulphate or potassium chloride) had no effect on the kinetics.

Abstract

On a etudie, dans une cellule agitee, la cinetique de la reaction entre I'oxygene dissous et le dithionite de sodium en solution aqueuse alcaline. Pour des concentrations de dithionite inferieures a 0.08 kmol/m3 et de d'hydroxyde de sodium comprises entre0.044 et 0.27 kmol/m3, les resultats ont indique que la reaction etait du premier ordre et d'ordre zero, vis-a-vis du dithionite de sodium et de I'oxygene respectivement. On a etabli que I'energie d'activation etait de 76.2 MJ/kmol sur une gamme de temperature comprise entre 15oC et 34pC. L'addition d'autres electrolytes (sulfate de sodioum ou chlorure de potassium) n'a eu aucum effet sur la cinetique en question.

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