FERMENTATION OF GLUCOSE WITH RECYCLE OF NON-FERMENTED COMPONENTS

摘要

A process for producing ethanol is described which includes the steps of: (a) continuously moving a feedstock slurry of starch and acid through a high intensity tubular starch hydrolyzer to produce a hydrolyzate in fluid form containing glucose, (b) fermenting the glucose-containing fluid to form a fermentation product containing ethanol, (c) distilling the fermentation product to separate the ethanol from a distillation residue containing non-fermented carbohydrate materials and, (d) recycling at least part of the obtained distillation residue as part of the starch and acid slurry feedstock to the hydrolyzer whereby a substantial portion of the recycled non-fermented carbohydrate materials is hydrolyzed together with the starch to a fermentable glucose-containing fluid.