Membrane-augmented polypropylene manufacturing
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United States of America Patent
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-
Aug 7, 2001
Grant Date -
N/A
app pub date -
Aug 30, 2000
filing date -
Aug 30, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for polypropylene manufacturing, including treating a vent stream from the polymerization reactor, to recover propylene for return to the reactor. The process involves using a gas separation membrane to separate propylene from propane in the reactor vent stream. The membrane separation step results in a residue stream typically containing as much as 30% propane or more, which is vented from the polymerization process, and a permeate stream containing 95% or less propylene, which is recirculated to the polymerization reactor.
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