| abstract |
The present invention has: a hydrothermal decomposition processing unit (17) that, by means of a processing tank having a gas-liquid interface, eliminates the hemicellulose component and the lignin component from a biomass starting material having cellulose, hemicellulose, and lignin by means of decomposition processing under high-temperature, high-pressure conditions; a biomass solid content extraction unit (18) that extracts biomass solid content (20), which is the hydrothermally insoluble component processed by the hydrothermal decomposition processing unit (17); a slurrification tank (21) that interconnects to the biomass solid content extraction unit (18) and slurrifies the extracted biomass solid content (20); and a hydrothermal discharge liquid introduction line (L 2 ) that introduces to the slurrification tank (21) a hydrothermal discharge liquid (16) containing the biomass hydrothermally insoluble component discharged from the hydrothermal decomposition processing unit (17). |