Process for preparing propylene homopolymers and copolymers
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United States of America Patent
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Sep 24, 2002
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N/A
app pub date -
Jun 24, 1998
filing date -
Jun 24, 1997
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Abstract
Described herein is a process and an apparatus for preparing propylene homopolymers and copolymers, which comprises polymerizing propylene optionally with comonomers in the presence of a catalyst at elevated temperature and pressure in at least one slurry reactor and at least one gas phase reactor, the polymerization product of at least one slurry reactor, containing unreacted monomers, being conducted to a first gas phase reactor essentially without recycling of the unreacted monomers to the slurry reactor. The invention provides for fast start-ups because the gas phase bed material is available directly from the loop reactor.
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