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Kinetic Modeling and Mechanisms of Acid-Catalyzed Delignification of Sugarcane Bagasse by Aqueous Acetic Acid

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Abstract

Organosolv pretreatment of lignocellulose pertains to a biomass fractionation process to obtain cellulosic pulp, high-purity lignin, and hemicellulosic syrup. In the present work, sugarcane bagasse was delignified by aqueous acetic acid (AcH) under atmospheric pressure with addition of sulfuric acid (SA) as a catalyst. Based on the multilayered structure of plant cell wall and the inhibitive effect of dissolved lignin on delignification rate, a novel pseudo-homogeneous kinetic model was proposed by introducing the concept of “potential degree of delignification (d D)” into the model. It was found that delignification rate was a first-order reaction with respect to SA concentration, while AcH concentration showed a high reaction order to delignification rate. The activation energy for delignification was determined to be 64.41 kJ/mol. The relationships of kinetic constants and d D with reaction temperature, AcH, and SA concentrations were determined according to experimental data. Mechanism analysis indicated that cleavage of α-aryl ethers bonds were mainly responsible for the formation of lignin fragments. AcH concentration affected the solubility parameter (δ value) of AcH solution and the ability to form hydrogen bonds with lignin fragments. Therefore, the driving force for solubilizing lignin fragments increased with AcH concentration, and thus AcH concentration had a very significant influence on delignification rate.

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Acknowledgments

The authors are grateful for the support of this work by the National Natural Science Foundation of China (No. 21106081), National Basic Research Program of China (973 Program) (No. 2011CB707406), and International Cooperation Project of the Ministry of Science and Technology of China (No. 2010DFB40170).

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Correspondence to Xuebing Zhao.

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Zhao, X., Liu, D. Kinetic Modeling and Mechanisms of Acid-Catalyzed Delignification of Sugarcane Bagasse by Aqueous Acetic Acid. Bioenerg. Res. 6, 436–447 (2013). https://doi.org/10.1007/s12155-012-9265-4

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