A kinetic study was performed to determine the kinetics of hemicellulose (xylan) hydrolysis during subcritical hydrothermal pretreatment of OPFPF. The trend of xylan conversion was observed over 40-min treatment time at two different conditions: without CO₂ addition at four different temperatures (170, 180, 190, and 200 °C), and with CO₂ addition of 0.5 and 1 MPa at 180 °C. Experimental data obtained was subsequently fitted into the selected first-order kinetic model. It was demonstrated that the experimental data was comparable to the predicted values, indicating the suitability of the chosen model for quantitative interpretation of the experimental results. In addition, the reaction rate was found to improve with the rise of temperature and the presence of CO₂, as indicated by the increasing values of reaction rate constants, k. The relationship between k and temperature was successfully established through Arrhenius equation, where the activation energies for xylan conversion were found in the range of 43.49 to 170.16 kJ/mol. Based on the results, subcritical pretreatment of OPFPF at 180 °C and 0.5 MPa CO₂ was suggested suitable for high glucose recovery from OPFPF due to high xylan removal rate and low generation of hydrolysis byproduct which is beneficial for successful saccharification and fermentation. This study provides knowledge in the kinetics of xylan autohydrolysis in oil palm frond, and hence could contribute in the process design for recovery of glucose and hemicellulose derivatives such as XOS and furfural from oil palm residues.

进行动力学研究以确定在 OPFPF 的亚临界水热预处理过程中半纤维素 (木聚糖) 水解的动力学。观察到木聚糖转化的趋势在40分钟的治疗时间在两种不同的条件：无CO ₂除了在四个不同温度下（170，180，190，和200℃），并用CO ₂加入0.5和1MPa的在180℃。随后将获得的实验数据拟合到选定的一级动力学模型中。结果表明，实验数据与预测值相当，表明所选模型适用于对实验结果进行定量解释。此外，发现反应速率随着温度的升高和 CO ₂的存在而提高，如反应速率常数k的增加值所示。通过阿伦尼乌斯方程成功建立了k与温度之间的关系，其中木聚糖转化的活化能在 43.49 至 170.16 kJ/mol 的范围内。根据结果​​，OPPFF 在 180 °C 和 0.5 MPa CO ₂下进行亚临界预处理由于高木聚糖去除率和低水解副产物的产生，有利于糖化和发酵的成功，因此建议适用于从 OPFPF 中高葡萄糖回收。该研究提供了有关油棕叶中木聚糖自水解动力学的知识，因此有助于从油棕残渣中回收葡萄糖和半纤维素衍生物（如 XOS 和糠醛）的工艺设计。