a method to recycle aqueous acidic liquor used to form depolymerized cellulose and hemicellulose accompanying cellulose , contained in biomass , by hydrolysis in the aqueous acidic liquor . cellulose is dissolved in the aqueous acidic liquor and then remains in place to hydrolyze cellulose to form depolymerized cellulose in the aqueous acidic liquor . the depolymerized cellulose , including dextrins , oligosaccharides , and glucose is substantially separated from the aqueous acidic liquor . the separated aqueous acidic liquor is then recycled to dissolve and hydrolyze additional cellulose to form additional depolymerized cellulose .