Abstract

This study presents a new kinetic scheme for the mass yield prediction of waste lignocellulosic biomasses treated by Hydrothermal Carbonization (HTC). The proposed reactions are based on the decomposition, solubilization, and polymerization of each main fraction of the biomass: cellulose, hemicellulose, and lignin. The ash content was assumed to be inert. The kinetic parameters have been obtained by non-linear adjustment using a data set with 220 experimental runs collected from the literature. The results indicate that the pre-exponential factors range was from 7.33 × 10¹ to 1.412x10⁵ min⁻¹, and activation energies were between 33.75 y 225.3 kJ/mol. A good fit is achieved between the observed and predicted data with an R² of 0.81 and an RMSE of 7.7 %. The proposed scheme was validated with the experimental data obtained by the HTC of sawdust (Pinus radiata) and rapeseed (Brassica napus). The experiments were carried out at temperatures of 190, 220, and 250 °C and reaction times of 0, 30, 60, 90, and 120 min. The predicted values showed an average error of 2.3 and 3.5 %, respectively. Therefore, the kinetic scheme is a useful tool in the conversion analysis of waste biomass treated by HTC.

摘要

本研究提出了一种新的动力学方案，用于通过水热碳化 (HTC) 处理的废弃木质纤维素生物质的质量产量预测。所提出的反应基于生物质的每个主要部分的分解、溶解和聚合：纤维素、半纤维素和木质素。假定灰分含量是惰性的。动力学参数已通过使用从文献中收集的具有 220 次实验运行的数据集通过非线性调整获得。结果表明，指前因子的范围为7.33 × 10 ¹到1.412x10 ⁵ min ^-1，活化能在33.75 y 225.3 kJ/mol之间。^{使用 R 2}在观察数据和预测数据之间实现了良好的拟合0.81 和 7.7% 的 RMSE。所提出的方案通过锯末（ Pinus radiata）和油菜（Brassica napus ）的 HTC 获得的实验数据进行了验证。实验在 190、220 和 250 °C 的温度和 0、30、60、90 和 120 分钟的反应时间下进行。预测值的平均误差分别为 2.3% 和 3.5%。因此，动力学方案是 HTC 处理的废弃生物质转化分析的有用工具。