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Kinetic study of ethylene polymerization by highly active silica supported TiCL 4 /MgCl 2 catalysts
Author(s) -
Kim Il,
Kim Jae Ha,
Woo Seong Ihl
Publication year - 1990
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1990.070390406
Subject(s) - polymerization , carbon monoxide , catalysis , ethylene , activation energy , monomer , chemistry , bulk polymerization , polymer chemistry , solution polymerization , kinetics , materials science , radical polymerization , polymer , organic chemistry , physics , quantum mechanics
The kinetics of ethylene polymerization with TiCl 4 /MgCl 2 /SiO 2 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/cm 2 . The role of MgCl 2 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 2 H 5 ) 3 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 2 H 5 ) 3 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 × 10 −2 mol/mol Ti by the inhibition method with carbon monoxide.