尼龙66连续缩聚过程模拟

为加深对聚己二酰己二胺(尼龙66)缩聚过程的理解,指导尼龙66生产过程的优化和新工艺开发,本研究基于聚合反应特性以及反应器流体力学特征,耦合聚合反应动力学模型、水-聚合物体系的汽液平衡模型以及传质模型,建立了尼龙66连续缩聚过程管式反应器和后缩聚反应器的数学模型,实现了尼龙66连续聚合过程的模拟。聚合物分子量及水含量的模拟值符合工业生产数据,验证了模型的可靠性,模拟分析了聚合工艺参数对聚合物分子量及水含量的影响,结果表明减少醋酸含量、提高反应器温度、降低管式反应器和后缩聚反应器压力均有利于快速提升聚合物分子量。较优的工艺条件为后缩聚器温度280~285℃,卧管式反应器压力1.600~1.750MPa。建立的模型准确性好,可用于考察工艺参数的影响,指导工业应用。

Modeling and Simulation of Continuous Polycondensation Process of Nylon 66

This research is to deepen the understanding of the polycondensation process of polyhexamethylene adipamide (nylon 66) and guide the optimization of nylon 66 production process and development of new technology.Based on the polymerization characteristics and hydrodynamic characteristics of the reactor,the kinetic model of the coupled polymerization,the vapor-liquid equilibrium and mass transfer models of the water-polymer system,the mathematic model of nylon 66 continuous polycondensation process tubular reactor and post-polycondensation reactor was established,and the simulation of nylon 66 continuous polymerization was realized.The simulation results indicated that the molecular weight and water content of the polymer were in good accordance with the industrial production data.The reliability of the model was verified and the influence of the polymerization parameters on the molecular weight and water content of the polymer was simulated The results demonstrated that reducing the HAc content,increasing the reactor temperature,reducing the reactor pressure of the tubular and the post-polycondensation reactors were beneficial to rapidly increase the molecular weight of the polymer.The optimum process conditions were post-reactor temperature of 280-285 ℃,the horizontal tubular reactor pressure of 1 600-1 750 kPa.The established models were good accuracy and can be used to examine the effects of process parameters and guide industrial applications.