Study on the Dissolution and Precipitation Process of Polyethylene Catalyst Used in Slurry Process

Ying-ying LIANG; Bing-yi LI; Qing-qiang GOU; Peng KOU

doi:10.14028/j.cnki.1003-3726.2022.08.009

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Study on the Dissolution and Precipitation Process of Polyethylene Catalyst Used in Slurry Process

更新时间：2022-09-09

- Study on the Dissolution and Precipitation Process of Polyethylene Catalyst Used in Slurry Process
- Polymer Bulletin Vol. 35, Issue 8, Pages: 70-74(2022)
- 作者机构：
  
  中石化(北京)化工研究院有限公司,北京 100013
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2022.08.009
  CLC：
- Published：20 August 2022，
  
  Received：27 December 2021，
  
  Revised：22 February 2022，
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Ying-ying LIANG, Bing-yi LI, Qing-qiang GOU, Peng KOU. Study on the Dissolution and Precipitation Process of Polyethylene Catalyst Used in Slurry Process. [J]. Polymer Bulletin 35(8):70-74(2022)
DOI：

Ying-ying LIANG, Bing-yi LI, Qing-qiang GOU, Peng KOU. Study on the Dissolution and Precipitation Process of Polyethylene Catalyst Used in Slurry Process. [J]. Polymer Bulletin 35(8):70-74(2022) DOI： 10.14028/j.cnki.1003-3726.2022.08.009.

摘要

研究了淤浆工艺用溶解析出体系聚乙烯催化剂的制备过程中各组分的物理化学变化。探索了该体系的溶解过程

首次通过动态光散射对溶解液进行了动态追踪

结合扫描电子显微镜与液体核磁等表征手段

证明了溶解过程中形成了氯化镁-乙醇(MgCl2-EtOH)微晶。还分析了催化剂的析出过程

发现催化剂中存在以氯化镁为主的晶相和以烷氧基钛(Ti(OC2H5)nCl4-n )为主的无定形相的双相结构。这一结果加深了对于该催化剂的认识

为其进一步优化和新催化剂体系的开发打下基础。

Abstract

The physical and chemical changes of the components in the preparation process of the dissolution and precipitation system polyethylene catalyst used in the slurry process were studied. The dissolution process of the system was explored. For the first time

dynamic light scattering was used to dynamically track the dissolving liquid. Combined with characterization methods such as scanning electron microscopy and liquid nuclear magnetism

it was proven that magnesium chloride-ethanol (MgCl2-EtOH) microcrystals were formed during the dissolution process. The precipitation process of the catalyst was also analyzed

finding that there was a two-phase structure in the catalyst that is the crystalline phase dominated by magnesium chloride and the amorphous phase dominated by titanium alkoxide (Ti(OC2H5)nCl4-n ). This study deepens the understanding of the catalyst and lays the foundation for its further optimization and the development of new catalyst systems.

关键词

淤浆工艺溶解析出乙烯聚合Ziegler-Natta催化剂

Keywords

Slurry ProcessDissolution and precipitationEthylene polymerizationZiegler-Natta catalyst

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