NEW METHOD
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United States of America Patent
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Issued Date -
Aug 22, 2024
app pub date -
Jun 7, 2022
filing date -
Jun 8, 2021
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Abstract
The invention relates to a method for extraction of hemicellulose, lignin and carbohydrates from a lignocellulosic biomass, wherein the method comprises: 1) extracting hemicellulose from lignocellulosic biomass, by heating lignocellulosic biomass and subcritical water to 110-170° C., under a pressure of from atmospheric pressure up to 2000 psi, and letting hemicelluloses be extracted from the biomass, leaving a first fiber residue, and 2) extracting lignin and carbohydrates from said first fiber residue, by heating said first fiber residue and said second solvent comprising ethanol and water to 110-170° C., under a pressure of from atmospheric pressure up to 2000 psi, and letting lignin and carbohydrates be extracted from said first fiber residue, leaving a second fiber residue. 2) may be performed in a plurality of static cycles. The invention further relates to a lignin obtained by said method.
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