Process for producing ethanol from fermentable sugar solutions

Details Process for producing ethanol from fermentable sugar solutions Process for producing ethanol from fermentable sugar solutions

C - Chemistry, Metallurgy

12

P

195/9

C12P 7/06 (2006.01)

Patent

CA 1212055

Abstract: For fermenting fermentable sugar solutions, yeast is added to the sugar solution. The yeast sludge formed is separated from the mixture obtained and introduced into the reaction chamber. Subsequently, after having completed the fermentation process, the yeast is discharged from the fermentation receptacle and, after having been combined with the nutrient solution, is at least partially recycled for producing the mixture with the sugar solution. Prior to separating the yeast sludge, the sludge can be subjected to a flocculation step. For improving the vitality of the yeast circulated along a closed circuit, the duration of the fermentation process is reduced by applying sub- atmospheric pressure for separating the alcohol by distil- lation during fermentation, thus equalizing the concen- tration of alcohol during the process.

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