Hemicellulose hydrolysis of corn stover catalyzed dilute acid was conducted at mild conditions in a reactor with cycle spray flow-through (DCF). The hydrolysate was analyzed and the effect of temperature

sulfuric acid concentration and reaction time on the concentration of main product xylose was studied.The results show that cycle spray can speed effectively up the process for continuos depolymerization of hemicellulose

and make the yield of xylose over 90% and less degradation products such as furaldehyde.Based on the acid catalyzed reaction mechanism of hemicellulose hydrolysis

hemicellulose and their hydrolysates were classified and lumped by their chemical composition and property

and a lumped kinetic model was proposed on reasonable simplification of reaction network.The kinetic rate constants were obtained by parameters estimation.The lumped kinetic model established can be used to predict the major hydrolysates and their contents at various hydrolysis conditions.The activation energy of xylose formation and degradation

calculated from a modified Arrhenius equation

was 107.1 kJ·mol-1 and 102.2 kJ·mol-1 respectively.