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Methods for producing extracted and digested products from pretreated lignocellulosic biomass

  • US 9,650,657 B2
  • Filed: 04/19/2011
  • Issued: 05/16/2017
  • Est. Priority Date: 04/19/2010
  • Status: Active Grant
First Claim
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1. A method for producing an extracted product from lignocellulosic biomass comprising:

  • completely converting native cellulose Iβ

    to cellulose IIII by pretreating the lignocellulosic biomass with anhydrous liquid ammonia or liquid ammonia comprising a solution of at least 80% ammonia at a temperature from about 50°

    C. to about 140°

    C. and at atmospheric pressure or higher to generate a pretreated lignocellulosic biomass, wherein the lignocellulosic biomass has a moisture content of less than 20% and a weight ratio of liquid ammonia to lignocellulosic biomass is 3;

    1 to 8;

    1, wherein the pretreated lignocellulosic biomass contains lignin and/or hemicellulose; and

    extracting at least a portion of the lignin and/or hemicellulose from said pretreated lignocellulosic biomass to produce said extracted product and a pretreated biomass product, wherein said extracted product contains said lignin and/or hemicellulose.

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