(Pyrazol-1-yl)carbonyl palladium complexes as catalysts for ethylene polymerization reaction

2013 ◽  
Vol 724 ◽  
pp. 95-101 ◽  
Author(s):  
Hosana D. Mkoyi ◽  
Stephen O. Ojwach ◽  
Ilia A. Guzei ◽  
James Darkwa
Keyword(s):  
Ethylene Polymerization ◽  
Palladium Complexes ◽  
Polymerization Reaction

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.

scholarly journals Modeling of Ethylene Polymerization with Ziegler-Natta Catalyst in a Bubbling Fluidized Bed Reactor

2021 ◽  
Author(s):  
Neda Felorzabihi
Keyword(s):  
Molecular Weight ◽  
Kinetic Model ◽  
Fluidized Bed ◽  
Ethylene Polymerization ◽  
Fluidized Bed Reactor ◽  
Polymerization Reaction ◽  
Solid Catalyst ◽  
Gas Temperature ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

In the present study, a new dynamic fluidized bed reactor (FBR) model is developed to account for the effect of bubble growth in the bed height on the dynamic behaviour of the reactor and the molecular properties of the polymer product. The model takes into account the existence of solid catalyst in both phases and consequently, the occurrence of polymerization reaction in both bubble and emulsion phases. A dynamic two-phase model is employed for predicting the key hydrodynamic parameters of the bed. A comprehensive kinetic model for ethylene polymerization in the presence of multiple-site Ziegler-Natta catalyst is considered to describe the number and molecular weight averages and molecular weight distribution of polymer in the FBR. The hydrodynamic model and the kinetic model have been coupled and solved simultaneously to simulate the performance of the fluidized bed reactor. The study incorporates the effects of the most important reactor parameters such as superficial gas velocity, mean particle size, inlet gas temperature, bubble size, recycle stream and chain transfer agent on the steady-state behaviour of the FBR. The proposed dynamic model is capable of predicting both the performance of the reactor and the polymer physiochemical properties.

Mechanistic details of ethylene polymerization reaction using methallyl nickel(ii) catalysts

2018 ◽  
Vol 20 (35) ◽  
pp. 22915-22925 ◽  
Author(s):  
Daniela E. Ortega ◽  
Diego Cortés-Arriagada ◽  
Alejandro Toro-Labbé
Keyword(s):  
Ethylene Polymerization ◽  
Polymerization Reaction ◽  
Mechanistic Study ◽  
Polyethylene Production ◽  
High Degree

We present a mechanistic study of the ligand functionalization of bulky boron co-activators on neutral methallyl Ni(ii) catalysts for polyethylene production. This provides a blueprint for the development and design of catalysts with a high degree of tunability in a more efficient way.

Influences of steric bulkiness in hydrotris(pyrazolyl)borate ligands on ethylene polymerization reaction

2009 ◽  
Vol 47 (21) ◽  
pp. 5720-5727 ◽  
Author(s):  
Masaaki Nabika ◽  
Seiki Kiuchi ◽  
Tatsuya Miyatake ◽  
Kiyoshi Fujisawa
Keyword(s):  
Ethylene Polymerization ◽  
Polymerization Reaction

scholarly journals Synthesis and ethylene polymerization reaction of dendritic titanium catalysts

2021 ◽  
Vol 24 (1) ◽  
pp. 13-21
Author(s):  
Tianyu Lan ◽  
Liduo Chen ◽  
Na Zhang ◽  
Jun Wang
Keyword(s):  
Ethylene Polymerization ◽  
Polymerization Reaction ◽  
Titanium Catalysts
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