title: Subcritical carbon dioxide-water hydrolysis of sugarcane bagasse pith for reducing sugars production.
abstract: The aim of present study was to obtain total reducing sugars (TRS) by hydrolysis in subcritical CO2-water from sugarcane bagasse pith (SCBP), the fibrous residue remaining after papermaking from sugarcane bagasse. The optimum hydrolysis conditions were evaluated by L16(45) orthogonal experiments. The TRS yield achieved 45.8% at the optimal conditions: 200°C, 40min, 500rmin-1, CO2initial pressure of 1MPa and liquid-to-solid ratio of 50:1. Fourier transform infrared spectrometry and two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance were used to characterize hydrolysis liquor, treated and untreated SCBP, resulting in the removal of hemicelluloses to mainly produce xylose, glucose and arabinose during hydrolysis. The severity factors had no correlation to TRS yield, indicating that the simple kinetic processes of biomass solubilisation cannot perfectly describe the SCBP hydrolysis. The first-order kinetic model based on consecutive reaction was used to obtain rate constants, activation energies and pre-exponential factors.
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology of Guangxi, Nanning 530004, China.
authors.forename: Jiezhen
authors.initials: J
authors.lastname: Liang
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology of Guangxi, Nanning 530004, China. Electronic address: lilm@gxu.edu.cn.
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Chen
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology of Guangxi, Nanning 530004, China.
authors.forename: Linlin
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology of Guangxi, Nanning 530004, China.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Wei
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
authors.forename: Huasheng
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
authors.forename: Songzhou
authors.initials: S
authors.lastname: Lu
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
authors.forename: Yunhua
authors.initials: Y
authors.lastname: Li
mesh_terms: D018533:Biomass; D002241:Carbohydrates / Q000096:biosynthesis*; D002245:Carbon Dioxide / Q000494:pharmacology*; D002482:Cellulose / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D011312:Pressure; D031786:Saccharum / Q000737:chemistry* / Q000187:drug effects; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000494:pharmacology*
chemical_list: D002241:Carbohydrates; D014867:Water; D002245:Carbon Dioxide; D002482:Cellulose; C027433:bagasse
keywords: Hydrolysis; Reaction kinetics; Subcritical CO(2)-water; Sugarcane bagasse pith; Total reducing sugar