数字农科院2.0

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

文献类型： 外文期刊

作者： 刘紫云;苏金霆;姚宗路;张元辉;司哺春;贾吉秀;赵亚男;赵立欣

作者机构：

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

期刊名称： Chemical Engineering Journal

ISSN： 1385-8947

年卷期： 2025 年 511 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

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 °C and 4 MPa and a maximum yield of 35.28 % at 160 °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 °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 °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 hydrothermal system for agricultural and environmental applications, offering important insights into biomass humification.

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