| abstract |
A lignin substance is extracted from biomass using hot water (subcritical water) without using any chemicals such as acid and alkali. In addition, by decomposing cellulose contained in a large amount of biomass and recovering it as a biomass aqueous solution, particularly a glucose aqueous solution, including effective use of biomass that can be used as a raw material for methane fermentation, ethanol fermentation, butanol fermentation, and heat recovery Optimize the system. SOLUTION: A biomass aqueous solution treated with hot water at normal pressure or higher and 5 MPa or lower and 180 ° C. or higher and 374 ° C. or lower is cooled to 100 ° C. or higher and lower than 180 ° C. to reduce the solubility of the lignin substance in hot water. The extract dissolved in is separated into a liquid lignin substance and an aqueous biomass solution. [Selection figure] None |