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Fractionation of Sugarcane Bagasse Using a Combined Process of Dilute Acid and Ionic Liquid Treatments

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Abstract

Biorefineries processing lignocellulose will produce chemicals and fuels from chemical constituents, cellulose, hemicelluloses, and lignin to replace fossil-derived products. Fractionation of sugarcane bagasse into three pure streams of chemical constituents was addressed through dissolution of constituents with the ionic liquids, 1-ethyl-3-methylimidazolium acetate ([EMiM]CH3COO) or 1-butyl-3-methylimidazolium methyl sulfate ([BMiM]MeSO4). Constituents were isolated from the reaction mixture with the anti-solvents acetone (Ā), acetone–water (AW), and sodium hydroxide (NaOH). Delignification was enhanced by NaOH, although resulting in impure product streams. Xylose pre-extraction (75 % w/w) by dilute acid pretreatment, prior to ionic liquid treatment, improved lignin purity after anti-solvent separation. Fractionation efficiency of the combined process was maximized (84 %) by ionic liquid treatment at 125 °C for 120 min, resulting in 80.2 % (w/w) lignin removal and 76.5 % (w/w) lignin recovery. Ionic liquids achieved similar degrees of delignification, although fully digestible cellulose-rich solids were produced only by [EMiM]CH3COO treatment.

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Acknowledgments

The authors would like to thank TSB Sugar for their financial support, and Genencor and Novozyme for providing the saccharification enzymes.

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Authors and Affiliations

  1. Department of Process Engineering, Stellenbosch University, Private Bag X1, Stellenbosch, 7602, South Africa

    Danie Diedericks, Eugéne van Rensburg & Johann F. Görgens

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  1. Danie Diedericks
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  2. Eugéne van Rensburg
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  3. Johann F. Görgens
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Correspondence to Johann F. Görgens.

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Diedericks, D., van Rensburg, E. & Görgens, J.F. Fractionation of Sugarcane Bagasse Using a Combined Process of Dilute Acid and Ionic Liquid Treatments. Appl Biochem Biotechnol 167, 1921–1937 (2012). https://doi.org/10.1007/s12010-012-9742-4

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  • DOI: https://doi.org/10.1007/s12010-012-9742-4

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