Patent ID: 8790904
Filing Date: 2014-07-29
Classification: C12P,Y02E

Abstract:
1. A process for producing ethanol from lignocellulosic biomass comprising: treating a lignocellulosic biomass with a dicarboxylic acid to hydrolyze hemicellulose of the lignocellulosic biomass to xylose; separating the treated lignocellulosic biomass to obtain a solid portion containing cellulose and a liquid portion containing xylose; fermenting the liquid portion containing xylose to provide a first ethanol containing material; hydrolyzing cellulose of the solid portion to provide a glucose containing medium; combining the first ethanol containing material with the glucose containing medium; fermenting the glucose containing medium after addition of the first ethanol containing material to provide a second ethanol containing material; isolating ethanol from the second ethanol containing material leaving a residue; and recovering the dicarboxylic acid from the residue to give a recovered dicarboxylic acid.