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• W3203739660 endingPage "114108" @default.
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• W3203739660 abstract "• After choline chloride (ChCl)-oxalic acid (OA)-AlCl 3 ·6H 2 O pretreatment , lignin yield was 55.43 %. • After ChCl-lactic acid (LA)-AlCl 3 ·6H 2 O pretreatment, the yields of lignin was 65.40 %. • After ChCl-LA-AlCl 3 ·6H 2 O pretreatment, the total phenolic hydroxyl was 2.22 mmol g −1 . • After ChCl-OA- AlCl 3 ·6H 2 O pretreatment, the total phenolic hydroxyl was 2.84 mmol g −1 . • After ChCl-OA- AlCl 3 ·6H 2 O pretreatment, the aliphatic hydroxyl was 0.79 mmol g −1 . Elucidating the structural characteristics and changes of lignin during biorefining is considerably significant for lignin valorization. Deep eutectic solvent (DES), as a green solvent, has shown excellent performance in extracting high-purity lignin from lignocellulose with high yields. However, further utilization of the multiple novels DES remains to be a severe challenge to the biorefinery process. In this study, alkaline lignin (AL), which was separated from sugarcane ( Sacharum officinale L. ) bagasse (SCB), was pretreated by a ternary DES (TDES) (choline chloride (ChCl)-lactic acid (LA)/oxalic acid (OA)-AlCl 3 ·6H 2 O) at 120 °C for 6 h to obtain regenerated lignin. The properties and structural transformation of lignin during the TDES pretreatment were investigated by gel-permeation chromatography (GPC), two-dimensional-heteronuclear single quantum correlation nuclear magnetic resonance (2D-HSQC NMR), 31 P NMR, Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA). Finally, the degradation products recovered from TDES pretreatment were also analyzed by pyrolytic gas chromatography-mass spectrometry (Py-GC–MS). It was found out that the yields of the regenerated lignin pretreated by ChCl-LA-AlCl 3 ·6H 2 O and ChCl-OA-AlCl 3 ·6H 2 O were 65.40 and 55.43 %, respectively. In contrast, the contents of phenolic hydroxyl groups in lignin were 2.54 and 2.84 mmol g −1 , respectively, the content of aliphatic hydroxyl groups were 0.91 and 0.79 mmol g −1 , respectively. In addition, it is found that the depolymerization of the lignin fraction was the dominant reaction during the TDES pretreatment. Based on the observed results, a possible pathway of chemical conversion of SCB lignin during the TDES pretreatment process was proposed. This study shows that the pretreatment with hydrated metal chloride-based TDES provides a promising condition for generating of the value-added lignin in the current biorefinery process." @default.
• W3203739660 created "2021-10-11" @default.
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• W3203739660 date "2021-12-01" @default.
• W3203739660 modified "2023-10-11" @default.
• W3203739660 title "Pretreatment of sugarcane bagasse with deep eutectic solvents affect the structure and morphology of lignin" @default.
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• W3203739660 doi "https://doi.org/10.1016/j.indcrop.2021.114108" @default.
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