• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >HDPE liquefaction: Random chain scission model
【24h】

HDPE liquefaction: Random chain scission model

机译：HDPE液化：随机断链模型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Liquefaction of commodity polymers to oils and gases can be used to recover the energy value of these materials. This article reports liquefaction data for high-density polyethylene (HDPE), one of the major plastics in recycled material. Thermal degradation of HDPE to oil-gas mixtures required higher temperatures (450-490 degrees C) than low-density polyethylene (LDPE) (430-460 degrees C) because of fewer chain branching points for HDPE, which are more susceptible to chain scission reactions. The addition of hydrogen (0.1-1.5 MPa) had negligible effect on product distribution. HDPE thermal degradation is consistent with a random chain scission mechanism. Product distributions for degradation at 450 degrees C were modeled assuming random chain scission with a rate constant k(x) dependent on the molecular weight x by a power law model dependence, k(x) = k(b) x(b), where k(b) is the pseudo-first-order rate constant, and b is the power index of dependence on molecular weight. Degradation rates dropped rapidly after initial breakup of the chains, and 2 sets of coefficients were needed to describe the molecular weight distributions as functions of reaction time. The error in model was about 10%. This model can be used to optimize the production of oils from thermal degradation of HDPE. (C) 1998 John Wiley & Sons, Inc. [References: 23]
机译：商品聚合物在石油和天然气中的液化可用于回收这些材料的能量值。本文报告了高密度聚乙烯（HDPE）的液化数据，该材料是回收材料中的主要塑料之一。 HDPE热降解为油气混合物所需的温度（450-490摄氏度）比低密度聚乙烯（LDPE）（430-460摄氏度）高，因为​​HDPE的链支化点较少，更容易发生断链反应。氢气（0.1-1.5 MPa）的添加对产物分布的影响可忽略不计。 HDPE的热降解与随机断链机制一致。假设在随机链断裂的情况下，速率常数k（x）取决于分子量x，通过幂律模型依赖性k（x）= k（b）x（b），对在450℃降解的产物分布进行建模。 k（b）是伪一级速率常数，b是依赖于分子量的幂指数。链最初断裂后，降解速率迅速下降，需要2组系数来描述分子量分布与反应时间的关系。模型中的误差约为10％。该模型可用于优化HDPE热降解产生的油。 （C）1998 John Wiley＆Sons，Inc. [参考：23]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号