Method and system for hydrolytic saccharification of a cellulosic biomass

摘要

A method and system for hydrolyzing cellulose and/or hemicellulose contained in a biomass into monosaccharides and oligosaccharides by using high-temperature and high-pressure water in a subcritical condition, is provided which is excellent in thermal efficiency and yields of saccharides. In hydrolyzing cellulose or hemicellulose into saccharides by using high-temperature and high-pressure water in a subcritical condition, a large amount of slurry is cooled into a condition below the subcritical condition by subjecting the slurry contained in a pressure vessel under a high-temperature and high-pressure condition to flash evaporation in a pressure vessel that is charged with a slurry of a cellulosic biomass and heated halfway, whereby it is possible to prevent saccharides from degrading into organic acids or the like as well as to save energy by recovery of thermal energy. It is possible that the cellulosic biomass is charged into a water-permeable vessel and then the water-permeable vessel is encapsulated into the pressure vessel together with water.