Process for the production of alcohols and/or solvents from lignocellulosic biomass with acid recycle of solid residues
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United States of America Patent
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Jun 12, 2018
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May 6, 2010
filing date -
May 15, 2009
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Abstract
The present invention describes a process for the production of alcohols and/or solvents from a cellulosic or lignocellulosic substrate, comprising at least the following steps:
- a step A for alkaline pre-treatment of said substrate, comprising a step for heating in the presence of an alkaline chemical reagent and an optional washing step;a step B constituted by a step for adjusting the pH and a step for enzymatic hydrolysis of the pre-treated substrate, at the end of which a hydrolysate is obtained constituted by a liquid phase containing sugars and a solid residue;a step for alcoholic fermentation of the hydrolysate obtained;a step for separation/purification (step C2) at the end of which one or more purified alcohols and/or solvents are obtained;a step for extracting the solid residue;a step D for acid digestion of at least a fraction of the extracted solid residue, at the end of which a portion or all of the product obtained is recycled to step B.
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