In this work, the continuous hydrothermal base catalyzed depolymerization of kraft lignin to phenolic oligomers was investigated. Using response surface methodology, a model equation for the oligomer yield in dependence of the four parameters temperature (513−573 K), NaOH concentration (1.67 and 2.50 wt%), reactor volume (0.055 and 1.000 L) and mass flow (10−20 kg/h) was obtained. To determine rate constants of the depolymerization reaction, a three-lump kinetic model was proposed, which shows a good correlation between the predicted and the experimental values. In dependence on the sodium hydroxide concentration, this model resulted in activation energies of 37 and 22 kJ/mol for the depolymerization with 1.67 and 2.50 wt% NaOH, respectively. The model enables the determination of the reaction time, where the rate of depolymerization reaches its maximum over repolymerization, which has been shown strongly depending on the reaction temperature and sodium hydroxide concentration.

在这项工作中，研究了连续的水热碱催化牛皮纸木质素解聚为酚醛低聚物。使用响应表面方法，根据四个参数温度（513-573 K），NaOH浓度（1.67和2.50 wt％），反应器体积（0.055和1.000 L）和质量流量（10-获得20kg / h）。为了确定解聚反应的速率常数，提出了一个三块动力学模型，该模型显示了预测值和实验值之间的良好相关性。取决于氢氧化钠浓度，该模型导致分别用1.67和2.50wt％的NaOH解聚的活化能为37和22kJ / mol。该模型可以确定反应时间，