The kinetics for hydrolysis of isoamyl DL-lactate over cation-exchange resin NKC-9 was investigated in this paper, which was the prerequisite for a proper design of reactive distillation processes. The effects of mass transfer resistance, temperature, catalyst dosage, and the molar ratio of water to isoamyl DL-lactate on conversion of isoamyl DL-lactate were evaluated. The pseudo-homogeneous (PH), Eley-Rideal (ER), and Langmuir-Hinshelwood (LH) models were then utilized to correlate the data obtained from experiments. Activities were used in the kinetics instead of the mole fractions because the reactants and products were not ideal. The activity coefficients were estimated by UNIFAC. It was demonstrated that the PH model was the best one to describe the hydrolysis of isoamyl DL-lactate. The standard enthalpy was 5.46 kJ · mol⁻¹ and the activation energy was 59.71 kJ · mol⁻¹. Finally, the thermal stability and reusability of NKC-9 were also tested.

中文翻译：

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NKC-9催化DL-乳酸异戊酯水解的动力学研究

本文研究了 DL-乳酸异戊酯在阳离子交换树脂 NKC-9 上的水解动力学，这是正确设计反应蒸馏工艺的先决条件。评估了传质阻力、温度、催化剂用量和水与 DL-乳酸异戊酯的摩尔比对 DL-乳酸异戊酯转化率的影响。然后使用伪均质 (PH)、Eley-Rideal (ER) 和 Langmuir-Hinshelwood (LH) 模型来关联从实验中获得的数据。因为反应物和产物不理想，所以在动力学中使用活性而不是摩尔分数。活动系数由 UNIFAC 估计。结果表明，PH模型是描述DL-乳酸异戊酯水解的最佳模型。标准焓为5.46 kJ·mol^-1，活化能为59.71 kJ·mol ^-1。最后，还测试了 NKC-9 的热稳定性和可重复使用性。