Patent ID: 8278080

Claim:
A method for preparing ethanol from biomass, comprising the steps of: (a) pulverizing biomass; (b) hydrolyzing the pulverized biomass by treating with sulfuric acid; (c) separating the resultant of the step (b) into liquid and solid phases; (d) (d-1) neutralizing the liquid phase of the resultant of the step (c) by treating with calcium carbonate (CaCO 3 ) as a neutralizer to obtain pentose and to form CaSO 4 , and, (d-2) sonicating the solid phase of the resultant of the step (c) and treating the same with cellulase to obtain hexose; and (e) fermenting the pentose and hexose of the step (d-1) and (d-2) by treating with ethanol-producing fermenting microorganism.