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PRETREATMENT OF LIGNOCELLULOSIC BIOMASS THROUGH REMOVAL OF INHIBITORY COMPOUNDS

  • US 20100263814A1
  • Filed: 04/07/2010
  • Published: 10/21/2010
  • Est. Priority Date: 04/20/2009
  • Status: Abandoned Application
First Claim
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1. A process for pretreatment of lignocellulosic biomass, comprising the steps of heating the lignocellulosic biomass with steam to a preselected temperature, at a preselected pressure and for a preselected time to hydrolyze and solubilize hemicelluloses in the lignocellulosic biomass, explosively decomposing the lignocellulosic biomass by rapidly releasing the pressure to break down the lignocellulosic biomass into fibers and extracting from the resulting reaction mixture a liquefied portion of the lignocellulosic biomass before or after explosive decomposition, for removing compounds from the lignocellulosic biomass which are inhibitory to enzymatic cellulose hydrolysis and sugar fermentation to ethanol, wherein the extracting step is discontinued once a dry matter (dm) content of xylose, as monomer or oligomer, in the reaction mixture of 4% to 8% (w/w dm) is achieved.

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