绝热法研究己内酰胺阴离子聚合尼龙动力学

Research on the Kinetics of Anionic Polymerization of Caprolactam to Nylon Using Adiabatic Method

采用己内酰胺钠盐、N-75缩二脲作为反应催化体系,确定反应温度在145-160℃之间,通过计算得到动力学参数:反应级数为准一级、活化能在73.2-77.1kJ·mol-1之间、指前因子在2.9×1011-3.6×1011mol1-n·s-1范围内.本实验条件下测定并计算的反应热为134.5-137.3J·g-1,与文献值(138.6J·g-1)吻合.并在前人基础上修正并建构了己内酰胺阴离子绝热反应动力学模型,对反应过程的模拟结果与实验数据基本吻合,从而证明了本模型的正确合理.

Kinetic parameters were calculated based on the catalytic reaction systems of sodium caprolactam salt and N-75 biuret at the temperature of 145 ℃ to 160 ℃. The reaction order was approximately first order. The activation energy was between 73.2-77.1 kJ·mol^-1 and the pre-exponential factor was between 2.9×10^11-3.6×10^11 mol^1-n·^-1. The calculated reaction heat of 134.5-137.3 J·g^-1 was in consonance with the literature value of 138.6 J·g^-1. The adiabatic reaction kinetic model of caprolactam anion was constructed based on the existing research findings. The coincidence between the simulation results and the experimental data revealed that the model was reasonable and correct.