聚酯降膜增黏反应过程模拟  

Process simulation of falling film liquid-state polymerization of polyester

作　　者：陈世昌[1,2] 曹峻华 陈文兴 CHEN Shichang;CAO Junhua;CHEN Wenxing(National Engineering Laboratory for Textile Fiber Materials Processing Technology,Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,China;Zhejiang Provincial Innovation Center of Advanced Textile Technology,Shaoxing,Zhejiang 312000,China)

机构地区：[1]浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,浙江杭州310018 [2]浙江省现代纺织技术创新中心,浙江绍兴312000

出　　处：《纺织学报》2025年第1期16-24,共9页Journal of Textile Research

基　　金：国家自然科学基金项目(52173047,51803187);浙江省重点研发计划项目(2021C01020)。

摘　　要：为促进对降膜熔融缩聚制备高分子量聚对苯二甲酸乙二醇酯(PET)增黏反应过程的理论认识,指导降膜反应器的设计与缩聚工艺优化,建立了降膜反应器串联五釜的连续聚合过程数学模型,以与工业生产数据匹配的五釜流程模拟结果为降膜反应釜入口物料参数,考察了PET分子量与端基量等品质指标随降膜增黏反应进程的变化,讨论了降膜反应器内温度和压力对聚合产物分子量与端基量的影响规律。结果表明:随着增黏反应的进行,可顺利得到特性黏度为1.0 dL/g以上、端羧基量为16 mmol/kg的产品;所建立的降膜反应器模型能够对增黏效果进行灵敏分析,高温低压有利于提升增黏反应效率,但过低的压力导致高黏熔体变得难处理和转移,且会增加设备成本和提高工艺精确控制的难度,温度过高则会显著增加副产物的生成;对降膜反应器选择压力为0.1 kPa左右、温度区间为285~290℃进行工艺参数调优,采用优化后的连续生产工艺流程最终反应器出口PET的分子量在39000 g/mol左右;模拟结果与工业生产值吻合,可运用于分析降膜增黏反应技术应用实践。Objective This research develops a comprehensive model for enhancing poly(ethylene terephthalate)(PET)production via liquid-state polymerization.By focusing on falling film flow and process simulation,the model aims to optimize the design of falling film reactors and refine the polymerization process,thereby improving the overall efficiency of industrial PET fiber production.Method A mathematical model for continuous polymerization was developed,focusing on a six-reactor system including five reactors and an additional falling film reactor,based on a specific industrial setup.This model,calibrated with industrial data,defines the input parameters for the falling film reactor.It analyzes changes in key quality metrics like molecular weight and end-group content and explores the influences of temperature and pressure on these metrics within the reactor.Results In this study,a mathematical model was constructed for a falling film liquid-phase polymerization reactor,tailored to simulate and analyze the distribution of component concentrations and polymer molecular weights within the reactor under varying operational conditions.The model demonstrated high accuracy,particularly under reaction conditions of 287℃and 100 Pa,successfully yielding a product with an intrinsic viscosity(ηintr)value of 1.0045 dL/g.Theηintr value at the product outlet showed only a 0.05%deviation,demonstrating the model′s precision and its ability to reflect the reactor′s production process accurately.The model meticulously details the axial distribution of components,showing a decrease in acid and hydroxyl end groups(E a)and hydroxyl end group(E g)along the reactor′s length,while vinyl end groups(E v)and degree of polymerization(DPN)increase almost linearly.Notably,the molecular flow rates of small molecules,ethylene glycol quality flow(Q EG)and water quality flow(Q w),exhibit a nonlinear response along the reactor length,with an initially high evaporation rate that gradually slows as the reaction proceeds and the DPN increases.Furth

关 键 词：聚酯 液相增黏 反应器 缩聚 过程模拟 缩聚工艺 

分 类 号：TQ343.4[化学工程—化纤工业] TQ340.63