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Effects of decoupled reaction pressure from temperature during hydrothermal humification of lignocellulose

文献类型： 外文期刊

作者： Liu, Ziyun 1 ; Su, Jinting 1 ; Yao, Zonglu 1 ; Zhang, Yuanhui 2 ; Si, Buchun 4 ; Jia, Jixiu 1 ; Zhao, Yanan 1 ; Zhao, Lixin 1 ;

作者机构： 1.CAAS, Minist Agr & Rural Affairs PR China, Inst Environm & Sustainable Dev Agr, Key Lab Low Carbon Green Agr North China, Beijing 100081, Peoples R China

2.Univ Illinois, Dept Agr & Biol Engn, Urbana, IL 61801 USA

3.Shandong Univ Technol, Shandong Res Ctr Engn & Technol Clean Energy, Sch Agr Engn & Food Sci, Zibo, Peoples R China

4.China Agr Univ, Coll Water Resources & Civil Engn, Key Lab Agr Engn Struct & Environm, Minist Agr & Rural Affairs, Beijing 100083, Peoples R China

关键词： Decoupled temperature and pressure; Hydrothermal humification; Humic acids; Biomass

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 511 卷

页码：

收录情况： SCI

摘要： Hydrothermal humification is a promising approach for synthesizing humic acids (HAs). However, its practical applications are constrained by limitations in conversion efficiency and properties. This study employs a decoupled hydrothermal system to investigate the independent effects of pressure and temperature on the transformation pathways and structural evolution of HAs. Results show that maintaining constant pressure significantly enhanced HAs production, achieving optimal selectivity of 66.01 % at 200 degrees C and 4 MPa and a maximum yield of 35.28 % at 160 degrees C and 6 MPa, representing respective increases of 16.1 % and 35.2 % compared to the control. Temperature and applied pressure exhibited a synergistic effect on the formation of HAs, as evidenced by the highest selectivity within the 4-8 MPa pressure range at 200-240 degrees C. The presence of C-O bonds, aromatic structures, and aliphatic side chains was enhanced under increased pressure, possibly because of intensified polymerization, condensation, and oxidation reactions. Meanwhile, the formation of functional groups such as carboxyl, ketone, ester, and quinone, was promoted by elevated temperatures. The highest carbon recovery (77.1 %) was achieved at 180 degrees C and 8 MPa, attributed to reduced mass loss at lower temperatures. This study optimizes the synthesis of HAs using a decoupled temperature and pressure hydro-thermal system for agricultural and environmental applications, offering important insights into biomass humification.

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