| abstract |
(1) a step of hydrolyzing cellulose-containing biomass to produce an aqueous sugar solution, (2) the aqueous sugar solution obtained in (1) is filtered through a microfiltration membrane and / or an ultrafiltration membrane, and sugar A step of recovering the aqueous solution from the permeation side, and filtering the aqueous sugar solution obtained in (3) and (2) through a nanofiltration membrane and / or a reverse osmosis membrane, In the method for producing a concentrated sugar aqueous solution using cellulose-containing biomass as a raw material, comprising the step of recovering the concentrated sugar aqueous solution from the above, (1) and A method for producing a water-saving concentrated sugar aqueous solution is provided by using it as washing water in the step (2). |