Ionic liquid-assisted isolation of lignin from lignocellulose and its esterification with fatty acids

Ionic liquids (ILs) have been widely used for lignocellulose fractionation and lignin isolation. However, the effect of IL treatment on structure has less explored. This study aimed to explore chemical isolated by imidazolium based ILs compare it with well-known milled wood (MWL). Four types were used, effects conditions (ILL) characteristics evaluated. As temperature was increased from 60 140 °C, ILL yield increased, whereas molecular weight hydroxyl group content decreased. Among ILs, [EMIM]Ac produced highest (5.28%), obtained had lowest (1.27 mM/g) a (Mw) 29,500 g/mol. Esterification performed using three fatty acid chlorides, octanoyl chloride (C8), lauroyl (C12), palmitoyl (C16), extend its applicability. The esterification evaluated, successful confirmed Fourier transform infrared nuclear magnetic resonance spectroscopies.