PURPOSE: To produce butanol in high concentration eliminating auxiliary facility for achieving anaerobic condition, by proliferating yeast to convert the space in a fermentation tank into anaerobic state and carrying out butanol fermentation in the tank.
CONSTITUTION: In the production of butanol by fermentation, a yeast is inoculated in a fermentation tank and proliferated prior to the inoculation of butanol- producing strain. The space in the fermentation tank becomes anaerobic state and the temperature increases by the proliferation of yeast. The yeast is subjected to autodigestion for a prescribed period under the above conditions and the fermentation tank is inoculated with a butanol-producing strain to perform butanol fermentation.
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