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Process for alcoholic fermentation of lignocellulosic biomass

  • US 8,642,303 B2
  • Filed: 12/22/2009
  • Issued: 02/04/2014
  • Est. Priority Date: 12/23/2008
  • Status: Active Grant
First Claim
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1. A process for the production of cellulosic ethanol from lignocellulosic biomass, comprising the steps of:

  • Pretreating the lignocellulosic biomass to decompose the lignocellulosic biomass into fibrous solids;

    Hydrolyzing the fibrous solids with enzymes to produce cellulose sugars; and

    fermentating the cellulose sugars in the presence of a stillage residue from a whole grain starch-to-ethanol dry mill process,wherein the step of pretreating the lignocellulosic biomass includes process conditions including the step of exposing the lignocellulosic biomass to steam in a reaction vessel at an elevated temperature and reaction pressure for a preselected exposure time, and releasing the reaction pressure for explosive decomposition of the lignocellulosic biomass,wherein the process conditions are selected for the achievement of a severity index of 3.9 to 4.1.

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