Abstract
The chemical transformation of lignocellulosic biomass into platform chemicals is one of the most efficient utilization methods for agricultural wastes. In this work, a one-pot strategy for the conversion of corn stalk to ethyl levulinate and further extraction of valorizable lignin catalyzed by ILs was proposed. With the optimized catalyst of [C3H6SO3Hmim]HSO4, corn stalk of 92.45% was transformed into ethyl levulinate with a favorable yield of 24.72% at 200 °C for 90 min. Furthermore, the lignin extraction was substantially influenced by co-solution system. A high lignin yield of 79.94% was achieved with ethanol content of 75% (v/v) in the ethanol-water system. The analysis on morphology, thermal stability and functional group showed that condensation of lignin occurred during the liquefaction process, the two-dimensional heteronuclear single quantum correlation (2D-HSQC) investigation demonstrated that the stable structure of lignin provides a favorable foundation for its valorization. Overall, this work proposed a feasible biorefinery strategy for effective conversion and utilization of lignocellulosic biomass.
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