Efficient sugar production from sugarcane bagasse by microwave assisted acid and alkali pretreatment |
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| Affiliation: | 1. Green Chemistry Centre of Excellence, Chemistry Department, University of York, Heslington, York, YO10 5DD, United Kingdom;2. CNAP, Department of Biology, University of York, York, Heslington, YO10 5DD, United Kingdom;3. Institute of Chemistry, University of Campinas, UNICAMP, P. O. Box 6154, 13084-971, Campinas, São Paulo, Brazil;4. Instituto de Física de São Carlos, Universidade de São Paulo/USP, Av. Trabalhador são-carlense, 400 Pq. Arnold Schimidt, 13566-590, São Carlos, São Paulo, Brazil;1. Pulp and Paper Laboratory, Department of Forestry Engineering, Federal University of Viçosa, Av. P. H. Rolfs, s/n, Campus, 36570-900 Viçosa, Minas Gerais, Brazil;2. Department of Biochemistry, Federal University of Viçosa, Av. P. H. Rolfs, s/n, Campus, 36570-900 Viçosa, Minas Gerais, Brazil;1. Indian Institute of Technology- Monash Research Academy, Indian Institute of Technology, Bombay, India;2. Bio-Processing Laboratory, Centre for Technology Alternatives for Rural Areas, Indian Institute of Technology, Bombay, India;3. Department of Gastroenterology, Central Clinical School, Monash University, Melbourne, Victoria, Australia;1. School of Environmental Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea;2. Bioenergy Research Center, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea;3. Department of Chemical Engineering, Keimyung University, 1095 Dalgubeoldaero, Dalseo-Gu, Daegu 704-701, South Korea;4. Division of Advanced Nuclear Engineering, School of Environmental Science and Engineering, Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea;1. Departament of Chemistry and Chemical Engineering, University of Matanzas, 44740 Matanzas, Cuba;2. Departament of Chemical, Environmental and Materials Engineering, University of Jaén, 23071 Jaén, Spain;3. TI-Institute for Wood Research, 21031 Hamburg, Germany;1. Biorefinery Group, Food Research Department, School of Chemistry, Autonomous University of Coahuila, 25280 Saltillo, Coahuila, Mexico;2. CEB-Centre of Biological Engineering, University of Minho, Campus Gualtar, 4710-057 Braga, Portugal;3. Cluster of Bioalcoholes, Mexican Centre for Innovation in Bioenergy (Cemie-Bio), Mexico;4. Department of Chemical Engineering, Faculty of Science, University of Vigo (Campus Ourense), As Lagoas, 32004 Ourense, Spain;5. CITI (Centro de Investigación, Transferencia e Innovación), University of Vigo, Tecnopole, San Ciprián das Viñas, 32901 Ourense, Spain |
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| Abstract: | Sugarcane bagasse represents one of the best potential feedstocks for the production of second generation bioethanol. The most efficient method to produce fermentable sugars is by enzymatic hydrolysis, assisted by thermochemical pretreatments. Previous research was focused on conventional heating pretreatment and the pretreated biomass residue characteristics. In this work, microwave energy is applied to facilitate sodium hydroxide (NaOH) and sulphuric acid (H2SO4) pretreatments on sugarcane bagasse and the efficiency of sugar production was evaluated on the soluble sugars released during pretreatment. The results show that microwave assisted pretreatment was more efficient than conventional heating pretreatment and it gave rise to 4 times higher reducing sugar release by using 5.7 times less pretreatment time. It is highlighted that enrichment of xylose and glucose can be tuned by changing pretreatment media (NaOH/H2SO4) and holding time. SEM study shows significant delignification effect of NaOH pretreatment, suggesting a possible improved enzymatic hydrolysis process. However, severe acid conditions should be avoided (long holding time or high acid concentration) under microwave heating conditions. It led to biomass carbonization, reducing sugar production and forming ‘humins’. Overall, in comparison with conventional pretreatment, microwave assisted pretreatment removed significant amount of hemicellulose and lignin and led to high amount of sugar production during pretreatment process, suggesting microwave heating pretreatment is an effective and efficient pretreatment method. |
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| Keywords: | Sugarcane bagasse Microwave pretreatment Sulphuric acid Sodium hydroxide Second generation bioethanol |
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