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首页> 外文期刊>Journal of Applied Polymer Science >Dynamic Modeling of Multizone, Multifeed High-Pressure LDPE Autoclaves
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Dynamic Modeling of Multizone, Multifeed High-Pressure LDPE Autoclaves

机译：多区域，多进料高压LDPE高压釜的动态建模

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摘要

A comprehensive mathematical model is developed t simulate the dynamic behavior of multizone, multifeed high-pressure ethylene polymerization auto-claves. To describe the complex flow patterns occurring in low-density polyethylene (LDPE) autoclaves, a user-specified multisegment, multirecycle model representation of teh actual multizone reactor is established. A general reaction mechanism is employed to represent the kinetics of ethylene polymerization. Dynamic mass, molar species, and energy balances are derived to predict the polymerization rate, monomer conversion, molecular weight developments (e.g., M_n, M_w, long- and short-chain branching), and temperature profile with respect to time and spatial position in the reactor. Detailed results on the start-up and grade transition of a four-zone autoclave reactor are presented and the effects of the macromixing parameters (e.g., number of segments per reaction zone and the total and side external recycle ratios) on the dynamic behaviro of the reactor are investigated. It is shown that the model macromixing parameters can significantly affect the initiator consumption rate in a reaction zone. The present model is capable of predicting accurately the dynamic behavior of LDPE autoclaves and, thus, can be employed in the design, optimization, and control of these reactors.
机译：建立了一个综合的数学模型来模拟多区，多进料高压乙烯聚合反应釜的动力学行为。为了描述在低密度聚乙烯（LDPE）高压釜中发生的复杂流型，建立了用户指定的实际多区反应器的多段，多循环模型表示形式。采用一般的反应机理来表示乙烯聚合的动力学。得出动态质量，摩尔种类和能量平衡，以预测聚合速率，单体转化率，分子量变化（例如，M_n，M_w，长链和短链支化）以及温度随时间和空间位置的变化情况反应堆。给出了关于四区高压釜反应器启动和梯度转变的详细结果，以及宏观混合参数（例如，每个反应区的段数以及总和侧外部循环比）对反应器动态性能的影响。反应堆进行了调查。结果表明，模型宏观混合参数可以显着影响反应区中引发剂的消耗速率。本模型能够准确预测LDPE高压釜的动态行为，因此可用于这些反应堆的设计，优化和控制。

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