Methods and systems for producing ethanol using raw starch and fractionation
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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Abstract
The present invention relates to methods for producing high levels of alcohol during fermentation of plant material, and to the high alcohol beer produced. The method can include fractionating the plant material. The present invention also relates to methods for producing high protein distiller'"'"'s dried grain from fermentation of plant material, and to the high protein distiller'"'"'s dried grain produced. The method can include drying a co-product by ring drying, flash drying, or fluid bed drying. The present invention further relates to reduced stack emissions from drying distillation products from the production of ethanol.
205 Citations
37 Claims
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1. A process for producing ethanol from plant material, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A process for producing ethanol from plant material, comprising:
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fractionating the plant material;
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 to yield a composition comprising at least 15 vol-% ethanol;
fermenting comprising reducing temperature of fermenting mixture, adding a cross-linking enzyme to cross-link proteins in the fermentation ; and
recovering the ethanol and co-products from the fermentation.
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Specification