Complete recovery of cellulose from rice straw pretreated with ethylene glycol and aluminum chloride for enzymatic hydrolysis.

Author(s) Tang, S.; Dong, Q.; Fang, Z.; Miao, Z.D.
Journal Bioresour Technol
Date Published 2019 Jul
Abstract

Rice straw was pretreated with ethylene glycol (EG) and AlCl for enzymatic hydrolysis. EG-AlCl pretreatment had an extremely good selectivity for component fractionation, resulting in 88% delignification and 90% hemicellulose removal, with 100% cellulose recovered or 76% (w/w) cellulose content in solid residue at 150 °C with 0.055 mol/L AlCl. The pretreated residue (5%, w/v) presented a higher enzymatic hydrolysis rate (glucose yield increased 2 times to 94%) for 24 h at cellulase loading of 10 FPU/g. The hydrolysis behavior was correlated with the composition and structure of substrates characterized by SEM, FT-IR, BET, XRD and TGA. The enzyme adsorption ability of pretreated straw was 12-folds that for the original sample. EG-AlCl solution was further cycled for 3 times with 100% cellulose recovery but only 29% lignin removal due to the loss of AlCl. EG-AlCl pretreatment is an efficient method with little loss of cellulose for lignocelluloses.

DOI 10.1016/j.biortech.2019.03.100
ISSN 1873-2976
Citation Tang S, Dong Q, Fang Z, Miao Z-. Complete recovery of cellulose from rice straw pretreated with ethylene glycol and aluminum chloride for enzymatic hydrolysis. Bioresour Technol. 2019;284:98-104.

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