Permeation Behavior of Formic, Acetic, Propionic, and Butyric Acids in Electrodialysis

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  • Takahashi Hiroshi
    Department of Materials-Process Engineering and Applied Chemistry for Environments, Graduate School of Engineering and Resources Science, Akita University
  • Sugawara Ryoko
    Department of Materials-Process Engineering and Applied Chemistry for Environments, Graduate School of Engineering and Resources Science, Akita University
  • Kikuchi Kenichi
    Department of Materials-Process Engineering and Applied Chemistry for Environments, Graduate School of Engineering and Resources Science, Akita University

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  • 電気透析におけるギ酸，酢酸，プロピオン酸，酪酸の膜透過挙動
  • デンキ トウセキ ニ オケル ギサン,サクサン,プロピオンサン,ラクサン ノ マク トウカ キョドウ

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Abstract

Membrane permeation characteristics of formic, acetic, propionic, and butyric acids were studied over a wide range of operating conditions in the electrodialysis. These mono-carboxylic acids permeated through an anion-exchange membrane, but did not permeate through a cation-exchange membrane. The flux of each mono-carboxylic acid in the single-acid system was significantly affected by solution pH: The flux increased rapidly at pH about 2, after which was kept constant. In the experiments of binary, and ternary acids systems, the order of the flux was formic acid>acetic acid>propionic acid>butyric acid. All the experimental results were analyzed with a mathematical model which considered dissociation equilibrium of mono-carboxylic acids, electroneutrality in the solution, ion-exchange between the solution and the ion-exchange membranes, and ionic flux in the ion-exchange membranes based on the Nernst-Planck’s equation. The model successfully explained the permeation behavior of single, binary, and ternary mono-carboxylic acids systems.

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