Study of Propylene Polymerization Catalyzed by Spherical MgCl₂-Supported Ziegler-Natta Catalyst System: Preparation of Spherical Support

Abstract

A novel route to prepare the MgCl₂–EtOH adduct support was developed. Many factors which effect the morphology of the support were studied in detail. It was found that the stirring speed of dispersion and the molar ratio of EtOH/MgCl₂ had an important influence on the support particle size and particle size distribution. Through varying the stirring speed or changing the EtOH/MgCl₂ ratio, MgCl₂ adduct supports with different particle size and particle size distribution could be obtained.

Keywords:

• Ziegler-Natta catalysts
• spherical MgCl₂ support
• particle size distribution

ACKNOWLEDGMENT

Support from the Science and Technology Commission of Zhejiang Province are gratefully acknowledged.

Notes

^a Adding EtOH for two times.

^b Adding EtOH for three times.

Polymerization condition: A1/Ti = 100; temperature = 50°C; [Ti] = 0.08 mmol/L;time = 30 min; pressure = 1 atm.