The effect of the compostion of heterogeneous polymerization catalyst on ethylene–1-butene copolymerization

✍ Scribed by Young Soo Ko; Jong-Ki Jeon

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 310 KB
• Volume: 132
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.12.013

✦ Synopsis

The effect of ethylaluminium dichloride (EADC) in the heterogeneous Ziegler-Natta catalyst on the ethylene-1-butene copolymerization and the molecular structure of the resulting copolymer was investigated. SiO 2 -supported TiCl 4 catalysts having different EADC/Ti molar ratio were prepared by changing the amount of EADC in feed during the catalyst preparation. Ti oxidation states of the prepared catalysts were changed with EADC/Ti molar ratio, and it contained the higher fraction of Ti(3+) and Ti(2+) at the higher EADC/Ti molar ratio. The change in EADC/Ti molar ratio of the catalyst was also shown to influence on the copolymerization performance. Xylene-solublility value corresponding to the fraction having low molecular weight with higher 1-butene content, decreased as EADC/Ti molar ratio decreased. The chemical compositional distribution of PE copolymer was shown not to be affected by EADC/Ti molar ratio of the catalyst significantly.