Ethanol production in a continuous process with cell recycle

Details Ethanol production in a continuous process with cell recycle Ethanol production in a continuous process with cell recycle

C - Chemistry, Metallurgy

12

P

195/2

C12P 7/06 (2006.01) C12M 1/12 (2006.01)

Patent

CA 1173381

ABSTRACT An improved method for the production of ethanol from a fermentable carbohydrate such as glucose, fructose or sucrose using the bacterium Zymomonas mobilis which method involves continuously anaerobically culturing the bacterium in a culture medium containing the fermentable carbohydrate, continuously or periodically drawing off a portion of the culture medium and replacing that portion with fresh culture medium, separating from the removed portion of the culture medium cells of Zymomonas mobilis contained therein, returning those cells to the culture medium, and recovering the ethanol contained in the portion of the culture medium from which the cells have been removed. It has been found that this method results in greatly improved ethanol production without the disadvantages which have been found when yeasts are continuously cultured.

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