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US 8,895,265 B2Granted
Multistage fractionation process for recalcitrant C5 oligosaccharides
AssigneeRenmatix, Inc.
InventorPhillip R. Gibbs
Life of this patent
Estimating the term…
Abstract
Methods are disclosed for increasing the level of C5 monosaccharides produced from lignocellulosic biomass using a multistage fractionation process to handle recalcitrant C5 oligosaccharides without producing unwanted degradation products. Methods for reducing C5 monosaccharides degradation products produced from lignocellulosic biomass are also disclosed. In addition, compositions and products produced by the methods are disclosed.
Claims73
A method of producing C5 monosaccharides from lignocellulosic biomass, comprising:
- providing a fractionated lignocellulosic biomass at a first temperature of at least about 200° C. and a first pressure, wherein said fractionated lignocellulosic biomass comprises:
- a first solid fraction comprising:
- cellulose;
- lignin;
- and
- hemicellulose;
- and
- a first liquid fraction comprising:
- a soluble C5 saccharide selected from the group consisting of C5 oligosaccharides, xylose, arabinose, and mixtures thereof;
- separating said first solid fraction from said first liquid fraction;
- forming a slurry comprising said first solid fraction and water;
- fractionating said slurry at a second temperature of at least about 200° C. and a second pressure to form:
- a second solid fraction comprising:
- cellulose;
- and
- lignin;
- and
- a second liquid fraction, comprising:
- a soluble C5 saccharide selected from the group consisting of C5 oligosaccharides, xylose, arabinose, and mixtures thereof;
- wherein said second temperature is greater than said first temperature;
- optionally, separating said second solid fraction from said second liquid fraction;
- optionally, combining said first liquid fraction and said second liquid fraction to form a third liquid fraction;
- and
- optionally, hydrolyzing said second liquid fraction or third liquid fraction at a third temperature and a third pressure to form C5 saccharides selected from the group consisting of C5 oligosaccharides having fewer mer units, xylose, arabinose, lyxose, ribose, and mixtures thereof;
- wherein said fractionating said slurry is conducted substantially free of added acid.
22 more elements
A method of producing C5 monosaccharides from lignocellulosic biomass, comprising:
- providing a fractionated lignocellulosic biomass at a first temperature and a first pressure, wherein said fractionated lignocellulosic biomass comprises:
- a first solid fraction comprising:
- cellulose;
- lignin;
- and
- hemicellulose;
- and
- a first liquid fraction comprising:
- a soluble C5 saccharide selected from the group consisting of C5 oligosaccharides, xylose, arabinose, and mixtures thereof;
- separating said first solid fraction from said first liquid fraction;
- forming a slurry comprising said first solid fraction and water;
- fractionating said slurry at a second temperature and a second pressure to form:
- a second solid fraction comprising:
- cellulose;
- and
- lignin;
- and
- a second liquid fraction, comprising:
- a soluble C5 saccharide selected from the group consisting of C5 oligosaccharides, xylose, arabinose, and mixtures thereof;
- wherein said second temperature is greater than said first temperature;
- optionally, separating said second solid fraction from said second liquid fraction;
- optionally, combining said first liquid fraction and said second liquid fraction to form a third liquid fraction;
- and
- optionally, hydrolyzing said second liquid fraction or third liquid fraction at a third temperature and a third pressure to form C5 saccharides selected from the group consisting of C5 oligosaccharides having fewer mer units, xylose, arabinose, lyxose, ribose, and mixtures thereof;
- wherein said fractionating said slurry is conducted substantially free of added acid.
22 more elements
A method comprising:
- providing a fractionated lignocellulosic biomass at a first temperature and a first pressure, wherein said fractionated lignocellulosic biomass comprises:
- a first solid fraction comprising:
- cellulose;
- lignin;
- and
- hemicellulose;
- and
- a first liquid fraction comprising:
- a soluble C5 saccharide selected from the group consisting of C5 oligosaccharides, xylose, arabinose, and mixtures thereof;
- separating said first solid fraction from said first liquid fraction;
- forming a slurry comprising said first solid fraction and water;
- fractionating said slurry at a second temperature and a second pressure to form:
- a second solid fraction comprising:
- cellulose;
- and
- lignin;
- and
- a second liquid fraction, comprising:
- a soluble C5 saccharide selected from the group consisting of C5 oligosaccharides, xylose, arabinose, and mixtures thereof;
- wherein said second temperature is greater than said first temperature;
- optionally, separating said second solid fraction from said second liquid fraction;
- optionally, combining said first liquid fraction and said second liquid fraction to form a third liquid fraction;
- optionally, hydrolyzing said second liquid fraction or third liquid fraction at a third temperature and a third pressure to form C5 saccharides selected from the group consisting of C5 oligosaccharides having fewer mer units, xylose, arabinose, lyxose, ribose, and mixtures thereof;
- and
- optionally, fermenting, catalyzing, or fermenting and catalyzing said C5 saccharides to form a fermentative product, a catalytic product, or a combination thereof;
- wherein said method is conducted substantially free of added acid.
23 more elements
Dependencies are inferred from the claim text.