Patent ID: 9708356
Date: 2017-07-18
CPC Classifications: C07D,C07H,C08H,C13K,D21C

Claim:
1. A method for manufacturing monosaccharides, oligosaccharides, and furfurals comprising: subjecting a biomass to primary hydrolysis under pressurization and heating conditions under which monosaccharides, oligosaccharides, and/or furfurals are produced while continuously supplying an aqueous suspension of a raw material suspension of the biomass from a supply port of a continuous primary hydrolysis device and moving the biomass suspension through the device, continuously discharging the primary hydrolysis suspension from a discharge port of the continuous primary hydrolysis device, and continuously extracting the primary hydrolysis solution separated from the primary hydrolysis suspension in the device from an intermediate extraction port equipped with a solid-liquid separation device provided at any position between the supply port and the discharge port of the continuous primary hydrolysis device in a state in which the temperature and pressurization of primary hydrolysis are maintained; extracting the primary hydrolysis solution from the primary hydrolysis suspension in the continuous primary hydrolysis device and feeding the solution to a secondary hydrolysis device; performing secondary hydrolysis with the secondary hydrolysis device under conditions in which the ratio (%) of the mass of all pentoses in the secondary hydrolysis solution discharged from a discharge port of the secondary hydrolysis device with respect to the mass of all pentoses contained in the solution supplied to the secondary hydrolysis device containing the primary hydrolysis solution [(mass of all pentoses in the secondary hydrolysis solution discharged from the discharge port of the secondary hydrolysis device/mass of all pentoses contained in the solution supplied to the secondary hydrolysis device)×100] is from 1 to 30%; and separating the secondary hydrolysis solution obtained by the secondary hydrolysis device into a vapor phase containing furfurals and a liquid phase containing sugars.