| 摘要 |
Provided is a method for producing a concentrated aqueous sugar solution using a cellulose-containing biomass as a raw material, the method comprising the steps of:
(1) hydrolyzing a cellulose-containing biomass to produce an aqueous sugar solution;
(2) filtering the aqueous sugar solution obtained in (1) through a microfiltration membrane and/or an ultrafiltration membrane, and recovering an aqueous sugar solution from the permeate side; and
(3) filtering the aqueous sugar solution obtained in (2) through a reverse osmosis membrane, and recovering a permeate from the permeate side and recovering a concentrated aqueous sugar solution from the feed side;
wherein at least a part of the permeate from the reverse osmosis membrane is used as a hydrothermal treatment liquid, biomass-suspending liquid, enzyme-diluting liquid, acid-diluting liquid and/or alkali-diluting liquid in the Step (1). The present invention can provide a method for producing a concentrated aqueous sugar solution, the method comprising hydrolyzing a cellulose-containing biomass to produce an aqueous sugar solution, treating the aqueous sugar solution with a microfiltration membrane and/or an ultrafiltration membrane to remove the biomass residue, and then concentrating the aqueous sugar solution by treatment with a reverse osmosis membrane to increase the sugar concentration, wherein the permeate discarded from the reverse osmosis membrane is recovered and reused to thereby save water. |
