Effects of Various Mixed Metal Chlorides- AlCl3 in TiCl4/MgCl2/THF Catalytic System on Ethylene Polymerization

Nittaya Sudsong; Wanna Phiwkliang; Bunjerd Jongsomjit; Piyasan Praserthdam

doi:10.22146/ajche.49704

Effects of Various Mixed Metal Chlorides- AlCl3 in TiCl4/MgCl2/THF Catalytic System on Ethylene Polymerization

https://doi.org/10.22146/ajche.49704

Nittaya Sudsong⁽¹⁾, Wanna Phiwkliang⁽²⁾, Bunjerd Jongsomjit⁽³⁾, Piyasan Praserthdam^(4*)

(1) Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
(2) Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
(3) Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
(4) Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
(*) Corresponding Author

Abstract

In this research, the modification of TiCl₄/MgCl₂/THF catalyst system with various metal chlorides was investigated on ethylene polymerization. Experimentally, metal chlorides (CaCl₂, FeCl₂ and ZnCl₂) were simultaneously introduced different with TiCl₄/MgCl₂/THF catalyst. ICP analysis was used to determine the total amount of each metal in the catalyst. For polymerization reaction, TEA was used as cocatalyst and hexane was used as a medium solvent. The Al/Ti molar ratio was 140. The activity result of Ca-Al, Zn-Al and Fe-Al was 979, 1009 and 1476 kgPE/molTi.h, respectively. The coaddition of AlCl₃ and FeCl₂ in TiCl₄/MgCl₂/THF catalyst system exhibited the highest activity. It suggested that the co-addition of AlCl₃ and FeCl₂ has higher electronegativity (EN) and the radius of Fe²⁺ is closer to Mg²⁺ resulting in an increased efficiency of the THF removal. This result led to improve the catalyst performance.

Keywords

Ziegler-Natta catalyst; ethylene polymerization; Lewis acids; TiCl4/MgCl2/THF catalyst

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