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为了寻求低成本、高附加值的再生方法,提出了微醇解与液相增黏结合的方式回收废旧聚酯(PET)纺织品。通过工艺探索及优化,确定了最佳工艺参数为:m[Zn(OAc)2]∶m(EG)∶m(PET)=1∶2.5∶1 000,醇解温度280℃,醇解时间10 min,自由沉降反应器温度275℃、压力4.0×104Pa,圆盘成膜反应器温度280℃、压力100 Pa。制备的再生PET熔体的特性黏度为0.658 d L/g,多分散性系数为2.14。与不经微醇解直接液相增黏的工艺对比,该再生方法使过滤器使用周期延长1.8倍,螺杆的加热和电机功率降低16%,节约了大量的能耗;且能够有效解决液相增黏过程中旋风分离器管道与反应釜之间管道堵塞和蒸汽喷射泵冷凝器易结焦的问题。
In order to find a low-cost, high value-added regeneration method, the waste polyester (PET) textile was proposed to be combined with the micro-alcoholysis and the liquid viscosity-increasing. Through the process exploration and optimization, the optimum technological parameters were determined as follows: m [Zn (OAc) 2]: m (EG): m (PET) = 1: 2.5: 1 000, alcoholysis temperature 280 ℃, alcoholysis time 10 min, the free fall settling temperature 275 ℃, pressure 4.0 × 104Pa, disk film forming reactor temperature 280 ℃, pressure 100 Pa. The prepared PET melt had an intrinsic viscosity of 0.658 dL / g and a polydispersity coefficient of 2.14. Compared with the process of direct liquid phase thickening without micro-alcoholysis, this regeneration method prolongs the filter life cycle by 1.8 times and the screw heating and motor power by 16%, saving a great deal of energy consumption; and can effectively solve the problems of liquid phase Thickening process in the cyclone pipe between the pipe and the reactor blockage and steam jet pump condenser coking problems.