Abstract
The worldwide crisis of the fossil fuels and the current environmental issues have led for the search of new alternative for the energy industrial sector. In this scenario, the production of second-generation ethanol, from the exploitation of lignocellulosic biomasses fractions, has presented itself as a prominent alternative. Thus, the present work aimed to develop a combined process for the sugarcane bagasse (SCB) fractionation using a deep eutectic solvent (DES), a new class of ecofriendly solvents, and diluted acid hydrolysis. The DES delignification process was able to reduce the SCB lignin content in about 48% and, at the optimum hydrolysis conditions (1.1% v v−1 of sulfuric acid and 59 min of hydrolysis time), the delignified material was converted into a solid fraction rich in cellulose (51.11 ± 0.95%, increment of 41.46%) and into a liquor product rich in xylose (18.26 ± 3.14 g L−1). The data statistical analysis proved that the combined strategy was superior to the single and direct acid hydrolyzation of SCB. The structural changes of the material after all investigated pretreatments were confirmed by FTIR and DRX techniques, what reinforce the relevance of the results here reported.
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Abbreviations
- UTB:
-
Untreated sugarcane bagasse
- DB:
-
Sugarcane bagasse sample after DES delignification process
- HDB:
-
Sugarcane bagasse sample after DES delignified and acid hydrolysis
- HB:
-
Sugarcane bagasse sample after acid hydrolysis
- HDBL:
-
Liquor obtained from the hydrolysis of DB sample
- HBL:
-
Liquor obtained from the hydrolysis of UTB sample
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Acknowledgements
The authors thank CAPES and the Brazilian National Council for Research for the financial support of the fellowships. They also thank The Laboratory of Bioengineering and the Laboratory of Fuels and Materials (LACOM), both at Federal University of Paraíba, and the Laboratory of Biochemcial Engineering, from Federal University of Rio Grande do Norte, for the technical instrumentation support. The authors thank National Institute of Science and Technology on Molecular Sciences (INCT-CiMol), Grant CNPq 406804/2022-2.
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Layanny Samara da Silva Souza: conception of the work, data collection, data analysis and interpretation and critical revision of the article. Vanessa Freire de França: data collection and data analysis. Willyan Araújo da Costa: data collection, data analysis and data interpretation. José Daladiê Barreto da Costa Filho: data collection and data analysis. Everaldo Silvino dos Santos: critical revision and final approval of the version to be published. Márcio José Coelho Pontes: critical revision and final approval of the version to be published. Liliana Fátima Bezerra Lira Pontes: conception of the work, interpretations and critical revision and final approval of the version to be published.
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da Silva Souza, L.S., da Costa, W.A., de França, V.F. et al. Combination of deep eutectic solvent and diluted acid pretreatments for sugarcane bagasse fractionation. Braz. J. Chem. Eng. (2024). https://doi.org/10.1007/s43153-023-00429-5
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DOI: https://doi.org/10.1007/s43153-023-00429-5