Kinetic Study of Electrodialysis of Acetic Acid and Phosphate in Fermentation Broth

概要

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Ion fluxes of acetic and phosphate in the electrodialysis of a model fermentation broth were examined using a solution of acetic acid and potassium dyhydrogenphosphate. As the molar fraction of the phosphate was incerased the ion flux of the acetic acid decreased, which was as predicted theoretically. As the influent pH was increased the flux also increased notably, reached a maximum, and then decreased slightly. The maximum flux was obtained in a pH range from 5.2 (near pK_a) to 6.6. The pH at the exit of the electrodialyzer became markadly alkaline when the influent pH was in the range of 6 to 7 in the absence of the phosphate. The pH range shifted to the alkaline side and the degree of alkalinity reduced as the molar fraction of phosphate increased. This may be ascribed to the buffering effect of the phosphate. It is concluded that the optimum pH for the electrodyalysis of an organic acid fermentation broth is around (pKa+1), where a relatively high ion flux with high current efficieny and a small pH increase at the exit of the electrolyzer are established.
公益社団法人日本生物工学会の論文
1994-03-25