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首页> 外文期刊>Journal of Applied Polymer Science >Modeling of ethylene polymerization with difunctional initiators in tubular reactors
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Modeling of ethylene polymerization with difunctional initiators in tubular reactors

机译：管式反应器中双官能引发剂乙烯聚合的建模

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The severe thermodynamic conditions of the high-pressure ethylene polymerization process hinder ethylene from going to full conversion. One remedy to improve the monomer conversion is to make effective use of difunctional peroxides. Multifunctional peroxides can accelerate the polymerization rate, produce branching, and modify the rheological properties of molten polymers. This article proposes a kinetic model based on a postulated reaction mechanism for ethylene polymerization initiated by difunctional initiators in a high-pressure tubular reactor. Three peroxides suitable for ethylene polymerization were compared for their effectiveness. Compared to dioctanoyl peroxide, the two difunctional peroxides considered performed much better for the higher temperature regions of the reactor and gave ethylene conversions nearly twice as high for only half of the initial amount of dioctanoyl. They also generated low-density polyethylene polymer with a broader molecular weight distribution and longer chain branching. These two important polymer characteristics can influence the end-product rheological properties. Injecting fresh ethylene at different points along the reactor improved the conversion and produced more branched polymer. (C) 2008 Wiley Periodicals, Inc.
机译：高压乙烯聚合过程的严格热力学条件阻碍了乙烯完全转化。改善单体转化率的一种方法是有效利用双官能过氧化物。多功能过氧化物可以加快聚合速度，产生支链并改变熔融聚合物的流变性。本文提出了一种基于假设的反应机理的动力学模型，该机理是由高压管式反应器中的双官能引发剂引发的乙烯聚合反应。比较了三种适用于乙烯聚合的过氧化物的有效性。与过氧化二辛酰相比，所考虑的两种双官能过氧化物在反应器的较高温度区域表现更好，并且仅二聚二酰基的初始量的一半使乙烯转化率几乎高出两倍。他们还产生了具有更宽的分子量分布和更长的支链的低密度聚乙烯聚合物。这两个重要的聚合物特性会影响最终产品的流变性。沿反应器在不同位置注入新鲜的乙烯可改善转化率，并产生更多的支链聚合物。 （C）2008 Wiley期刊公司

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