Method for producing sugar solution

摘要

A method for producing a sugar solution by processing a cellulose-derived sugar solution with use of one or more separation membranes selected from among an ultrafiltration membrane, a nanofiltration membrane and a reverse osmosis membrane. In this method for producing a sugar solution, a separation membrane that has been contaminated through filtration can be effectively cleaned by cleaning the contaminated separation membrane with hot water at 50˚C or more.