| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing acetic acid from the liquid obtained by hydrolyzing of a biomass.SOLUTION: While a biomass suspension is continuously supplied from a supply port of a continuous primary hydrolysis device and is moved through the device, the biomass undergoes a primary hydrolysis process under pressurization and heating conditions in which monosaccharides, oligosaccharides, and furfurals are produced. While a resulting suspension of the hydrolysis process is continuously discharged from a discharge port of the primary hydrolysis device, a resulting liquid of the primary hydrolysis process is separated from the resulting suspension of the hydrolysis process in the device and extracted from an intermediate extraction port, which includes a solid-liquid separation device and is provided between the supply port and the discharge port of the primary hydrolysis device, while the resulting liquid of the primary hydrolysis process is maintained at the temperature and pressure at which the hydrolysis process is conducted. The extracted resulting liquid of the primary hydrolysis process is transferred to a culturing tank and acetic acid is manufactured in the culturing tank by using acetic acid-producing bacteria. In this acetic acid manufacturing method, the concentration of furfurals in the resulting liquid of the primary hydrolysis process supplied to the culturing tank is maintained at 0.5 mass% or less. |
