Method of continuously producing ethanol from sugar-...

Details Method of continuously producing ethanol from sugar-... Method of continuously producing ethanol from sugar-...

C - Chemistry, Metallurgy

12

P

195/10

C12P 7/14 (2006.01) C12P 7/06 (2006.01)

Patent

CA 1239600

ABSTRACT OF THE DISCLOSURE: In a method of continuously producing ethanol from sugar- containing substrates by fermentation of sugars by means of a flocculating strain of Zymomonas mobilis under anaerobic conditions and at a pH of from 4.5 to 7 a substrate is led commonly with Zymomonas mobilis cells through at least three fermentation stages without preceding sterilization, a concentration of at least 4 % by volume of ethanol is maintained in each fermentation stage, a residence time of the fermentation medium in the entire system of maximally 3 1/3 h corresponding to a dilution rate of the fermenta- tion medium in the entire system of at least 0.3 h-1 is adjusted, the Zymomonas mobilis cells are separated by sedimentation after the final fermentation stage, the Zymo- monas mobilis cells are recycled into the first fermenta- tion stage, and the ethanol-containing substrate separated from the Zymomonas mobilis cells is drawn off.

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