Patent ID: 9624516
Date: 2017-04-18
CPC Classifications: C12M,C12P,C13K

Claim:
1. A method of producing a sugar liquid by repeating a sugar liquid production process comprising (1) to (3): (1) adding a filamentous fungus-derived cellulase to cellulose which is a processed product obtained by subjecting a cellulose-containing biomass to alkaline treatment, hydrothermal treatment or dilute sulfuric acid treatment and has not been subjected to enzyme treatment to perform primary hydrolysis; (2) adding a fresh filamentous fungus-derived cellulase without adding cellulose to a hydrolysate formed in (1) without separating a solid residue in hydrolysate to perform secondary hydrolysis; and (3) subjecting another hydrolysate formed in (2) to solid-liquid separation to obtain a sugar liquid and recovering enzyme from the sugar liquid; wherein recovered enzyme obtained in (3) is used for (1) of next and later sugar liquid production processes, and as said filamentous fungus-derived cellulase in (1) of the sugar liquid production process, an enzyme component recovered from a cellulose hydrolysate produced by a filamentous fungus-derived cellulase is used.