2024-03-29T09:22:13Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1815522022-02-04T13:43:23Zcom_10261_101com_10261_5col_10261_354
00925njm 22002777a 4500
dc
Lara-Serrano, Marta
author
Morales-de la Rosa, Silvia
author
Campos Martín, José Miguel
author
García Fierro, José Luis
author
2019-05-07
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 <sup>1</sup>H 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 H<sub>2</sub>SO<sub>4</sub>) 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.
Applied Sciences 9(9): 1862 (2019)
2076-3417
http://hdl.handle.net/10261/181552
10.3390/app9091862
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100003339
http://dx.doi.org/10.13039/100012818
Lignocellulosic biomass
Ionic liquid
Ethyl methyl imidazolium
Fractionation
Pretreatment
Barley straw
Fractionation of Lignocellulosic Biomass by Selective Precipitation from Ionic Liquid Dissolution