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Propylene polymerization in a semibatch slurry reactor over supported TiCl 4 /MgCl 2 /ethyl benzoate/triethyl aluminum catalyst. I. Catalytic behavior
Author(s) -
Dumas Constantine,
Hsu Cheng C.
Publication year - 1989
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.1989.070370615
Subject(s) - polymerization , crystallinity , catalysis , tacticity , polymer chemistry , materials science , monomer , polypropylene , ethyl benzoate , solution polymerization , chemical engineering , polymer , chemistry , organic chemistry , composite material , engineering
High activity TiCl 4 /MgCl 2 /ethyl benzoate (EB)/triethyl aluminum (TEA) catalysts for the polymerization of propylene were synthesized and characterized for particle size distribution and crystallinity. Polymerization was carried out in a semibatch, constant pressure slurry reactor. A correction for interfacial mass transfer was found to be necessary to relate the monomer feed rate to the instantaneous rate of polymerization. Without such a correction serious misinterpretation of rate data could result. Optimum productivity was observed with respect to the Al/Ti ratio. Similar behavior was observed with polymerization temperature. Isotacticity increased with polymerization tamperature and decreased with Al/Ti ratio. The addition of a small amount of 2,2,6,6‐tetramethylpiperidine increased the percentage of isotactic polypropylene to 98% without significantly affecting productivity.