An unusually stable supported bis(cyclopentadienyl)titanium dichloride-trialkylaluminum catalyst system for ethylene polymerization

1993 ◽  
Vol 26 (17) ◽  
pp. 4712-4714 ◽  
Author(s):  
G. Satyanarayana ◽  
S. Sivaram
Keyword(s):  
Ethylene Polymerization ◽  
Catalyst System ◽  
Titanium Dichloride

EPR spectroscopic study of Ni(I) species in the catalyst system for ethylene polymerization based on α-diimine Ni(II) complex activated by MMAO

2019 ◽  
Vol 880 ◽  
pp. 267-271 ◽  
Author(s):  
Igor E. Soshnikov ◽  
Nina V. Semikolenova ◽  
Konstantin P. Bryliakov ◽  
Artem A. Antonov ◽  
Wen-Hua Sun ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Ethylene Polymerization ◽  
Catalyst System

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

2015 ◽  
Vol 14 (2) ◽  
pp. 12
Author(s):  
Nittaya Sudsong ◽  
Wanna Phiwkliang ◽  
Bunjerd Jongsomjit ◽  
Piyasan Praserthdam
Keyword(s):  
Catalytic System ◽  
Ethylene Polymerization ◽  
Catalyst System ◽  
Polymerization Reaction ◽  
Molar Ratio ◽  
Metal Chlorides ◽  
Mixed Metal ◽  
Icp Analysis ◽  
Co Addition

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.

Bis [N-(3-tert-butylsalicylidene) cyclooctylamine] titanium dichloride activated with MAO for ethylene polymerization

2013 ◽  
Vol 49 (7) ◽  
pp. 1753-1759 ◽  
Author(s):  
Supaporn Khaubunsongserm ◽  
Bunjerd Jongsomjit ◽  
Piyasan Praserthdam
Keyword(s):  
Ethylene Polymerization ◽  
Titanium Dichloride

Study the Influences of ZnEt2 on Ethylene Chain Transfer Polymerization

2012 ◽  
Vol 602-604 ◽  
pp. 672-675
Author(s):  
An Guo Xiao ◽  
Shi Biao Zhou ◽  
Qing Yun Zheng ◽  
You Ming Shen ◽  
Yong Bin Zhuan
Keyword(s):  
Ethylene Polymerization ◽  
Nickel Complex ◽  
Chain Transfer ◽  
Ion Pairs ◽  
Catalyst System ◽  
Chain Propagation ◽  
Polymerization Mechanism ◽  
System 1 ◽  
Chain Transfer Polymerization

The influences of ZnEt2 on ethylene chain transfer polymerization were investigated in detail and the polymerization mechanism was thoroughly analyzed. The results indicated that ZnEt2 contributed greatly to increase the activity of α-diimine nickel complex/ZnEt2/MAO(MAO: methylaluminoxane). It was striking that α-diimine nickel complex/ZnEt2 catalyst system (1/100 mol/mol) exhibited 8.0 ×104g/mol∙h activity, it was possible the formation of the ion pairs of Nickel and Zinc was convenient for ethylene chain propagation, however, the ion pairs were unstable in ethylene polymerization.

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