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Development of a general kinetic model for organic acid-catalyzed hydrolysis of corn stalk

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Abstract

Efficient separation of carbohydrates and lignin, and converting them into valuable products are still major challenges for biorefinery commercialization. In this paper, organic acid-catalyzed hydrolysis of corn stalk was carried out as the first step of biorefinery. The hydrolysis behavior of lignocellulose from different tissues of corn stalk under different conditions (e.g., acid species and other process parameters) has been deeply analyzed. The results showed that the dissociation constants (pKa) were closely related to the hydrolysis of sugars, and oxalic acid had significant degradation ability on carbohydrates. Moreover, two robust models have been developed for monitoring the hydrolysis kinetics of carbohydrates in corn bark and pith. Lastly, the residue solids-driven activated carbon materials have also been developed for application in the fields of energy storage and environmental protection. This work provides a waste-free biorefinery reference for high-value utilization of corn stalk or other lignocellulose based on organic acid pretreatment.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (21968014, 22008097), the National Key Research and Development Program of China (Grant Nos. 2019YFC1805904, 2018YFC1902102, 2018YFC1902105), the State Key Laboratory of Pulp and Paper Engineering of China (Grant No. 202004) and the Analysis and Testing Foundation of Kunming University of Science and Technology (No. 2019M20182208042, 2019T20170031)

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Correspondence to Liang He or Qingqing Guan.

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This article does not contain any studies with human participants or animals performed by any of the authors. In this experiment, we did not collect any samples of humans and animals.

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Appendix

Appendix

Appendix 1: preparation of multifunctional porous carbon materials from the above hydrolysis residues

Moreover, in this work, according to the concept of waste-free biorefinery, the above hydrolysis residues is also used to prepare porous carbons for application in the fields of water purification and electronic energy storage. As seen in Supplementary Information Appendix A. The results showed that the prepared porous activated carbon has good purification ability for Cr(VI), MB and phenol wastewater. In addition, when used as capacitor material, its properties are similar to those of other reported activated carbon materials, and it has good electrochemical energy storage performance.

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Yang, S., Peng, L., Liu, E. et al. Development of a general kinetic model for organic acid-catalyzed hydrolysis of corn stalk. Cellulose 28, 6935–6952 (2021). https://doi.org/10.1007/s10570-021-03977-6

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  • DOI: https://doi.org/10.1007/s10570-021-03977-6

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