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Synthesis of Quaternary Ammonium Room-Temperature Ionic Liquids and their Application in the Dissolution of Cellulose
Article

Fractionation of Lignocellulosic Biomass by Selective Precipitation from Ionic Liquid Dissolution

Energy and Sustainable Chemistry Group (EQS), Instituto de Catálisis y Petroleoquímica, CSIC, c/Marie Curie 2 Cantoblanco, 28049 Madrid, Spain
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Appl. Sci. 2019, 9(9), 1862; https://doi.org/10.3390/app9091862
Received: 15 April 2019 / Revised: 29 April 2019 / Accepted: 30 April 2019 / Published: 7 May 2019
(This article belongs to the Special Issue Cellulose Conversion Technology)
We propose the treatment of barley straw with 1-ethyl-3-methylimidazolium acetate [EMIMAcO] ionic liquids (ILs) and subsequent precipitation with antisolvent mixtures, thus allowing the separation of the sugar-rich fractions (cellulose and hemicellulose) from the lignin fraction. For this purpose, different concentration ranges of acetone:water antisolvent mixtures were studied. In all cases, a high recovery percentage and a high and effective separation of fractions was achieved for 1:1 acetone:water. The fractionated lignocellulosic compounds were studied by using infrared spectroscopy, scanning electron microscopy and 1H nuclear magnetic resonance characterization techniques. This method allows the possibility of reusing IL, confirming the versatility of the established method. The fraction rich in cellulose and hemicellulose was subjected to acid hydrolysis (0.2 mol/L H2SO4) for 5 h at 140 °C, obtaining a yield of total reducing sugars of approximately 80%, much higher than those obtained in non-pretreated samples. View Full-Text
Keywords: lignocellulosic biomass; ionic liquid; ethyl methyl imidazolium; fractionation; pretreatment; barley straw lignocellulosic biomass; ionic liquid; ethyl methyl imidazolium; fractionation; pretreatment; barley straw
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MDPI and ACS Style

Lara-Serrano, M.; Morales-delaRosa, S.; Campos-Martín, J.M.; Fierro, J.L.G. Fractionation of Lignocellulosic Biomass by Selective Precipitation from Ionic Liquid Dissolution. Appl. Sci. 2019, 9, 1862. https://doi.org/10.3390/app9091862

AMA Style

Lara-Serrano M, Morales-delaRosa S, Campos-Martín JM, Fierro JLG. Fractionation of Lignocellulosic Biomass by Selective Precipitation from Ionic Liquid Dissolution. Applied Sciences. 2019; 9(9):1862. https://doi.org/10.3390/app9091862

Chicago/Turabian Style

Lara-Serrano, Marta, Silvia Morales-delaRosa, Jose M. Campos-Martín, and Jose L.G. Fierro 2019. "Fractionation of Lignocellulosic Biomass by Selective Precipitation from Ionic Liquid Dissolution" Applied Sciences 9, no. 9: 1862. https://doi.org/10.3390/app9091862

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