Methods for producing extracted and digested products from pretreated lignocellulosic biomass
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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Abstract
Methods for producing extracted and digested products from pretreated lignocellulosic biomass are provided. The methods include converting native cellulose Iβ to cellulose IIII by pretreating the lignocellulosic biomass with liquid ammonia under certain conditions, and performing extracting or digesting steps on the pretreated/converted lignocellulosic biomass.
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Citations
28 Claims
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1. A method for producing an extracted product from lignocellulosic biomass comprising:
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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; andextracting 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. - 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, 27, 28)
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26. A method for producing a digested product from lignocellulosic biomass comprising:
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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 biomass, wherein the lignocellulosic biomass has a moisture content 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; anddigesting the pretreated biomass with a combination of enzymes to produce fermentable sugars, wherein the combination of enzymes comprises at least one exocellulase, at least one endocellulase and/or beta-glucosidase.
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Specification