Kinetic study of ethylene polymerization by highly active silica supported TiCL4/MgCl2 catalysts

✍ Scribed by Il Kim; Jae Ha Kim; Seong Ihl Woo

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 846 KB
• Volume: 39
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1990.070390406

✦ Synopsis

The kinetics of ethylene polymerization with TiCl,/MgCl,/SiO, has been investigated in the range of temperatures between 40 and 90°C and in the range of ethylene pressures between 4 and 12.4 kg/cm2. The role of MgCI, was discussed from the dependence of the Mg/Ti ratio on the catalytic activity. The polymerzation rate was first order with respect to the monomer concentration and the dependence of the polymerization rate on the concentration of Al(C,H& could be described by the Langmuir-Hinshelwood mechanism. The dependence of initial rate and the time to reach the maximum polymerization rate on the concentration of Al(C,H,), was also discussed. Polymerization rates as a function of the polymerization temperature showed a maximum and the activation energy was 11.8 kcal/mol between 50 and 80°C. The polymerization rate decreased with the increase of hydrogen partial pressure. The active site concentration ( C * ) was 1.9 X mol/mol Ti by the inhibition method with carbon monoxide.