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Methods and systems for producing ethanol using raw starch and fractionation

  • US 20070037267A1
  • Filed: 05/02/2006
  • Published: 02/15/2007
  • Est. Priority Date: 05/02/2005
  • Status: Abandoned Application
First Claim
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1. A process for producing ethanol from plant material, comprising:

  • reducing the plant material to produce material comprising starch;

    the reduced plant material having particle size such that at least about 50% of the particles fit through a sieve with a 0.1-0.5 mm mesh;

    saccharifying the starch, without cooking, with an enzyme composition;

    fermenting the incubated starch with a recombinant yeast exhibiting enhanced stress resistance to yield a composition comprising at least 15 vol-% ethanol;

    fermenting comprising reducing temperature of fermenting mixture; and

    recovering the ethanol and co-products from the fermentation.

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