| 摘要 |
PURPOSE:To prevent deterioration of a microorganism and improve efficiency of fermentation, by the presence of polyphosphoric acid or a salt thereof in a fermentation liquor in continuing fermentation while separating a fermentation product by electrodialysis. CONSTITUTION:The anode 2 and cathode 3 are provided in an electrodialytic cell 1 and two pairs each of cation exchange membranes 4 and anion exchange membranes 4 are placed between both the electrodes 2 and 3 to divide the interior of the electrodialytic cell 1 into an anode compartment 6, concentration chamber 7, dilution chamber 8, concentration chamber 7 and cathode compartment 9. A fermentation liquor is circulated through the dilution chamber 8, cathode compartment 9 and fermenter 11 and a fermentation liquor is circulated through the concentration chamber 7 and recovery tank 12. In the process, polyphosphoric acid or a salt thereof is added to the fermentation liquor. Triphosphoric acid, particularly tetra- or higher phosphoric acid is preferred as the polyphosphoric acid. The amount of the polyphosphoric acid or salt thereof is preferably 0.02-0.2g to 1l fermentation liquor.
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