Effect of lignocellulosic components on the hydrothermal carbonization reaction pathway and product properties of protein

Ruikun Wang, Zhaohua Lin, Shu Meng, Senyang Liu, Zhenghui Zhao, Chunbo Wang and Qianqian Yin

Energy, 2022, vol. 259, issue C

Abstract: Blending lignocellulosic biomass with sewage sludge can further improve the fuel performance of hydrochar. Investigating the effects of different lignocellulosic components on protein hydrothermal carbonization (HTC) reaction pathways and product properties can provide insights into ways to screen lignocellulosic biomass. In this study, cellulose, hemicellulose, and lignin were selected for co-HTC with protein in different mass ratios (1:2 and 2:1). Results showed that the dehydration and decarboxylation reactions were strong when protein–hemicellulose co-HTC in a mass ratio of 2:1, and the O/C and H/C atomic ratios of the hydrochar decreased to 0.14 and 1.19, respectively. As the blending ratio of lignocellulosic components increased, the interaction gradually reached saturation, and the synergistic effect on the properties of mixture hydrochar decreased. Moreover, the functional group characteristics of the mixture hydrochar tended to resemble the chemical structures of lignocellulosic components. The Maillard and Mannich reactions between lignocellulosic components and proteins during co-HTC resulted in the re-solidification of N-containing compounds in the liquid-phase products. The degradation products of protein and (hemi)cellulose (glucose and furfural) were polymerized into char by the Maillard reaction. However, water-soluble N-containing compounds were immobilized into char through adsorption or reaction with lignin O-containing functional groups.

Keywords: Hydrothermal carbonization; Lignocellulosic components; Protein; Hydrochar; Interaction (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:259:y:2022:i:c:s0360544222019582

DOI: 10.1016/j.energy.2022.125063

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