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Updated: May 28, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
Published on: August 10, 2016
Influence of Cation Chain Length and Anion Identity in Imidazolium-Based Ionic Liquids on Lignin Depolymerization via
Diana Lucía Campa-Guevara1, Nohra Violeta Gallardo-Rivas1, Erick Orlando Merinos-Herrera1
1Tecnológico Nacional de México-I. T. Cd. Madero, Los Mangos, 1 de Mayo s/n, Ciudad Madero 89440, Tamaulipas, Mexico.
Abstract:
In this work, the ability of a series of imidazolium-based ionic liquids (ILs) to depolymerize Kraft lignin through acid hydrolysis was evaluated. ILs featuring two-, four-, and six-carbon alkyl chains combined with [Cl-], [BF4-] and [CH3COOH-] anions were studied to determine the influence of cation and anion structure. The twelve ILs were synthesized and characterized by FT-IR and 1H/13C NMR spectroscopy. Results indicate that both the anion and cation significantly affect depolymerization efficiency; specifically, longer alkyl chain lengths correlated with higher conversion percentages. Anion efficacy followed the order: [Cl-] > [CH3COOH-] > [BF4-]. Furthermore, reaction temperature did not show a significant impact on conversion within the studied range. Spectroscopic data suggest that bond dissociation follows a Brønsted acid-catalyzed mechanism, evidenced by the reduction of phenolic components and guaiacyl/syringyl units in the recovered lignin samples.
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