초록 ▼

A feedstock slurry of starch and acid is continuously moved through a high intensity tubular starch hydrolyzer to produce a fluid hydrolyzate containing glucose. This glucose-containing fluid is then fermented to form a fermentation product containing ethanol which is then distilled to separate the

A feedstock slurry of starch and acid is continuously moved through a high intensity tubular starch hydrolyzer to produce a fluid hydrolyzate containing glucose. This glucose-containing fluid is then fermented to form a fermentation product containing ethanol which is then distilled to separate the ethanol from the residue of the distillation which contains non-fermented carbohydrate materials. At least part of the distillation residue is recycled as part of the feedstock slurry of starch and acid to the hydrolyzer, thus allowing a substantial portion of the previously unfermented feedstock to be hydrolyzed to a fermentable glucose-containing fluid.

대표청구항 ▼

A process for producing ethanol which comprises: (a) continuously moving a slurry of carbohydrate material through a confined tubular preheat zone and transferring sufficient heat to the slurry whereby it passes through a gelation stage and forms into a hot free flowing liquid and immediately forcin

A process for producing ethanol which comprises: (a) continuously moving a slurry of carbohydrate material through a confined tubular preheat zone and transferring sufficient heat to the slurry whereby it passes through a gelation stage and forms into a hot free flowing liquid and immediately forcing said hot liquid through a restrictive opening and into a confined tubular reaction zone accompanied by a sudden decrease in pressure at a rate so that the carbohydrate material is made highly reactive and continuously moving the highly reactive carbohydrate material, together with an acid hydrolyzing agent, through the tubular reaction zone as a single hydrolysis stage to produce a hydrolyzate in fluid form containing at least 85% glucose, (b) fermenting the glucose-containing fluid to form a fermentation product containing ethanol, (c) distilling the fermentation product to separate ethanol from a distillation residue containing non-fermented carbohydrate materials and (d) passing at least part of the obtained distillation residue containing non-fermented carbohydrate materials through the single hydrolysis state (a) whereby a portion of said non-fermented materials is hydrolyzed to a fermentable glucose-containing liquid.