Valorization of Eucalyptus wood by glycerol-organosolv pretreatment within the biorefinery concept: An integrated and intensified approach |
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| Affiliation: | 1. CEB-Centre of Biological Engineering, University of Minho, Campus Gualtar, 4710-057 Braga, Portugal;2. Biorefinery Group, Food Research Department, School of Chemistry, Autonomous University of Coahuila, Blvd. V. Carranza e Ing. José Cárdenas Valdés, 25280 Saltillo, Coahuila, Mexico;1. School of Energy Science and Engineering, Central South University, Changsha, Hunan 410083, China;2. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA;1. Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran;2. Electrical Engineering Faculty, Sahand University of Technology, Tabriz, Iran;1. School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China;2. CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China;1. Molecular Biochemistry Laboratory, Materials and Surface Science Institute, Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland;2. Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Tamilnadu, India;1. University School of Chemical Technology, GGS IP University, Delhi, India;2. Department of Chemical Engineering, IIT, Delhi, India;1. Université de Tunis El Manar, Ecole Nationale d''Ingénieurs de Tunis, LR11ES15 Laboratoire des Systèmes Electriques, 1002, Tunis, Tunisie;2. Université Fédérale de Toulouse Midi-Pyrénées, INPT, UPS, LAPLACE, 2 Rue Charles Camichel, BP 7122, F-31071, Toulouse Cedex 7, France |
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| Abstract: | The efficient utilization of lignocellulosic biomass and the reduction of production cost are mandatory to attain a cost-effective lignocellulose-to-ethanol process. The selection of suitable pretreatment that allows an effective fractionation of biomass and the use of pretreated material at high-solid loadings on saccharification and fermentation (SSF) processes are considered promising strategies for that purpose. Eucalyptus globulus wood was fractionated by organosolv process at 200 °C for 69 min using 56% of glycerol-water. A 99% of cellulose remained in pretreated biomass and 65% of lignin was solubilized. Precipitated lignin was characterized for chemical composition and thermal behavior, showing similar features to commercial lignin. In order to produce lignocellulosic ethanol at high-gravity, a full factory design was carried to assess the liquid to solid ratio (3–9 g/g) and enzyme to solid ratio (8–16 FPU/g) on SSF of delignified Eucalyptus. High ethanol concentration (94 g/L) corresponding to 77% of conversion at 16FPU/g and LSR = 3 g/g using an industrial and thermotolerant Saccharomyces cerevisiae strain was successfully produced from pretreated biomass. Process integration of a suitable pretreatment, which allows for whole biomass valorization, with intensified saccharification-fermentation stages was shown to be feasible strategy for the co-production of high ethanol titers, oligosaccharides and lignin paving the way for cost-effective Eucalyptus biorefinery. |
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| Keywords: | High-gravity ethanol Organosolv pretreatment Lignocellulosic biomass Lignin characterization Biorefinery Industrial strain |
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