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Fermentation of glucose with recycle of non-fermented components

  • US 4,497,896 A
  • Filed: 07/19/1982
  • Issued: 02/05/1985
  • Est. Priority Date: 07/19/1982
  • Status: Expired due to Term
First Claim
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1. 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.

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