Kinetics of the propylene polymerization with prepolymerization at high temperature using Ziegler-Natta catalyst

2014 ◽  
Vol 132 (15) ◽  
pp. n/a-n/a ◽  
Author(s):  
Ning Tan ◽  
Luqiang Yu ◽  
Zhong Tan ◽  
Bingquan Mao
Keyword(s):  
High Temperature ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Kinetics Of ◽  
Ziegler Natta Catalyst

scholarly journals Comparative Study on Kinetics of Ethylene and Propylene Polymerizations with Supported Ziegler–Natta Catalyst: Catalyst Fragmentation Promoted by Polymer Crystalline Lamellae

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 358 ◽  
Author(s):  
Zhen Zhang ◽  
Baiyu Jiang ◽  
Feng He ◽  
Zhisheng Fu ◽  
Junting Xu ◽  
...  
Keyword(s):  
Propylene Polymerization ◽  
Lamellar Thickness ◽  
Efficient Catalyst ◽  
Two Systems ◽  
Key Factor ◽  
Natta Catalyst ◽  
Internal Electron ◽  
20 Nm ◽  
Kinetics Of ◽  
Ziegler Natta Catalyst

The kinetic behaviors of ethylene and propylene polymerizations with the same MgCl2-supported Ziegler–Natta (Z–N) catalyst containing an internal electron donor were compared. Changes of polymerization activity and active center concentration ([C*]) with time in the first 10 min were determined. Activity of ethylene polymerization was only 25% of that of propylene, and the polymerization rate (Rp) quickly decayed with time (tp) in the former system, in contrast to stable Rp in the latter. The ethylene system showed a very low [C*]/[Ti] ratio (<0.6%), in contrast to a much higher [C*]/[Ti] ratio (1.5%–4.9%) in propylene polymerization. The two systems showed noticeably different morphologies of the nascent polymer/catalyst particles, with the PP/catalyst particles being more compact and homogeneous than the PE/catalyst particles. The different kinetic behaviors of the two systems were explained by faster and more sufficient catalyst fragmentation in propylene polymerization than the ethylene system. The smaller lamellar thickness (<20 nm) in nascent polypropylene compared with the size of nanopores (15–25 nm) in the catalyst was considered the key factor for efficient catalyst fragmentation in propylene polymerization, as the PP lamellae may grow inside the nanopores and break up the catalyst particles.

Study of the effect of hydrogen in propylene polymerization with the MgCl2-supported ziegler-natta catalyst—part 1. Kinetics of polymerization

1994 ◽  
Vol 30 (11) ◽  
pp. 1309-1313 ◽  
Author(s):  
L.A. Rishina ◽  
E.I. Vizen ◽  
L.N. Sosnovskaja ◽  
F.S. Dyachkovsky
Keyword(s):  
Propylene Polymerization ◽  
Kinetics Of Polymerization ◽  
Natta Catalyst ◽  
Kinetics Of ◽  
Ziegler Natta Catalyst

Control of Ziegler–Natta catalyst activity by the structural design of alkoxysilane-based external donors

2020 ◽  
Vol 44 (17) ◽  
pp. 6845-6852 ◽  
Author(s):  
Vikas Khatri ◽  
Usharani Sahoo ◽  
Sukhdeep Kaur ◽  
Rashmi Rani ◽  
Gurmeet Singh ◽  
...  
Keyword(s):  
Structural Design ◽  
Catalyst Activity ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Herein, the evaluation of four commercial alkoxysilanes and two laboratory synthesized novel diethoxysilacycloalkanes as external donors towards propylene polymerization has been done.

POISONING OF ACTIVE SITES ON ZIEGLER-NATTA CATALYST FOR PROPYLENE POLYMERIZATION

2008 ◽  
Vol 26 (05) ◽  
pp. 547 ◽  
Author(s):  
Kitti Tangjituabun ◽  
Sang Yull Kim ◽  
Yuichi Hiraoka ◽  
Toshiaki Taniike ◽  
Minoru Terano ◽  
...  
Keyword(s):  
Active Sites ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst
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