Title:
Process For Extracting Lignin From Lignocellulosic Material Using An Aqueous Organic Solvent And An Acid Neutralizing Agent
Process For Extracting Lignin From Lignocellulosic Material Using An Aqueous Organic Solvent And An Acid Neutralizing Agent
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Abstract
A process for the delignification of cellulosic materials, wherein a high-yield cellulose pulp and high-value by-product, such as reactive lignins of low molecular weight are produced, which comprises degassing lignocellulosic material, rapidly heating the lignocellulosic material in a liquor comprising water, an organic solvent and a buffer thereby maintaining a substantially neutral solvent extraction, such that said lignocellulosic material is cooked in the liquor as it is heated from a temperature of 150°C. to a selected maximum temperature in the range of 200° to 280°C.; and rapidly cooling the mixture to a temperature less than 150°C. The reaction is controlled to maximize reactive lignin solvation while suppressing cellulose degradation.
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5/24/1988
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Patent