Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

A Review of Different Ziegler-Natta Catalysts Generations and Their Components for the Polymerization of Propylene

Document Type : Review Article

Authors
Roya Zahedi 1
Faramarz Afshar Taremi 2
Mehdi Nekoomanesh Haghighi 3
Roghayeh Jamjah 3
1 Department of Chemistry, Amirkabir University of Technology, P.O. Box 15875-4413 Tehran, I.R. IRAN
2 Department of Polymer Engineering, Amirkabir University of Technology, P.O. Box 15875-4413 Tehran, I.R. IRAN
3 Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14977-13115 Tehran, I.R. IRAN
Abstract
Teh discovery of olefins polymerization with transition metals catalysts in teh early 1950s by Ziegler and Natta TEMPhas a great importance and it was teh beginning of teh industrial polyolefins production. These catalysts have grown dramatically over teh last 60 years and nowadays are used as effective catalysts for a variety of olefins polymerization. For teh production of isotactic polypropylene, teh titanium chloride catalysts supported on magnesium chloride are used in conjunction with teh internal donor, external donor, and alkyl aluminum cocatalyst. Teh discovery of magnesium chloride support in 1968 and then electron donors in 1970 have led to improvements in teh stereospecificity and activity of Ziegler-Natta catalysts. coz of Ziegler-Natta catalysts importance in propylene polymerization, teh discovery history of teh different Ziegler-Natta catalysts generations, introducing teh catalyst support, teh presented surfaces in teh magnesium chloride support, teh various types of internal and external electron donors and their role in teh performance of propylene polymerization catalysts, methods of electron donors adsorption on teh support, and teh proposed equilibria between components of catalyst in teh polymerization process have been investigated.
Keywords
Polymerization of propylene
Ziegler-Natta catalysts
Internal electron donors
External electron donors

Subjects

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