Patent ID: 8080128

Claim:
A method for increasing the concentration of xylose in lignocellulosic hydrolysate comprising the steps of: extruding lignocellulosic material and mixing the lignocellulosic material with diluted acid at a feed rate of between about 6 and 7 kg/hr and a flow rate of between about 12 and 14 kg/hr, wherein the speed of a rotational screw is between about 30 and 150 rpm at the barrel temperature of 80-160° C., creating a mixture; feeding the resulting mixture into a hot-water extraction tank and cooking the mixture at an average temperature of 130-160° C. for 10-30 minutes; and separating the liquids from the solids using a solid separating device to produce a lignocellulosic hydrolysate; wherein the concentration of the xylose in the lignocellulosic hydrolysate is 40 to 60 g/L and wherein the yield of the xylose is 70% to 90%.