Effective conversion of corn stalk into ethyl levulinate and crude lignin catalyzed by ionic liquids

Xiaoqi Lin

doi:10.1016/j.biombioe.2023.106894

Effective conversion of corn stalk into ethyl levulinate and crude lignin catalyzed by ionic liquids

2023-08-01

7

PRE

AI

X

Xiaoqi Lin

K

Kaisen Jiang

X

Xuebin Liu

H

Hong‐Yan Bi

T

Tianya Li

D

Dezhi Han

Q

Qinqin Zhang *

DOI：10.1016/j.biombioe.2023.106894

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Abstract

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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 degrees C for 90 min. Furthermore, the lignin extraction was substantially influenced by cosolution 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.

Keywords:

Corn stalk

Ionic liquids

Ethyl levulinate

Lignin

Biorefinery

Effective conversion of corn stalk into ethyl levulinate and crude lignin catalyzed by ionic liquids

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