Dilute acid/metal salt hydrolysis of lignocellulosics
First Claim
1. A modified dilute acid method of hydrolyzing the cellulose and hemicellulose in lignocellulosic material under conditions to obtain higher overall fermentable sugar yields than is obtainable using dilute acid alone, comprising:
- impregnating a lignocellulosic feedstock with a mixture of an amount of aqueous solution of a dilute acid catalyst and a metallic salt catalyst sufficient to hydrolyze the hemicellulose and cellulose fractions to provide higher overall fermentable sugar yields than is obtainable when hydrolyzing with dilute acid alone;
loading said impregnated lignocellulosic feedstock into a reactor and heating for a sufficient period of time to hydrolyze substantially all of the hemicellulose and greater than 45% of the cellulose to water soluble sugars; and
recovering said water soluble sugars.
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Abstract
A modified dilute acid method of hydrolyzing the cellulose and hemicellulose in lignocellulosic material under conditions to obtain higher overall fermentable sugar yields than is obtainable using dilute acid alone, comprising:
impregnating a lignocellulosic feedstock with a mixture of an amount of aqueous solution of a dilute acid catalyst and a metal salt catalyst sufficient to provide higher overall fermentable sugar yields than is obtainable when hydrolyzing with dilute acid alone;
loading the impregnated lignocellulosic feedstock into a reactor and heating for a sufficient period of time to hydrolyze substantially all of the hemicellulose and greater than 45% of the cellulose to water soluble sugars; and recovering the water soluble sugars.
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Citations
15 Claims
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1. A modified dilute acid method of hydrolyzing the cellulose and hemicellulose in lignocellulosic material under conditions to obtain higher overall fermentable sugar yields than is obtainable using dilute acid alone, comprising:
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impregnating a lignocellulosic feedstock with a mixture of an amount of aqueous solution of a dilute acid catalyst and a metallic salt catalyst sufficient to hydrolyze the hemicellulose and cellulose fractions to provide higher overall fermentable sugar yields than is obtainable when hydrolyzing with dilute acid alone;
loading said impregnated lignocellulosic feedstock into a reactor and heating for a sufficient period of time to hydrolyze substantially all of the hemicellulose and greater than 45% of the cellulose to water soluble sugars; and
recovering said water soluble sugars.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A combination of a dilute acid catalyst and a metal salt catalyst at a sufficient temperature to hydrolyze greater than 45% cellulose and substantially all of the hemicellulose in a lignocellulosic material in a single stage to obtain higher overall fermentable sugar yields than is obtainable using dilute acid alone.
Specification