Method of producing vacuum in the production of polymers
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United States of America Patent
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Jan 8, 2008
Grant Date -
Nov 2, 2006
app pub date -
Mar 31, 2004
filing date -
Apr 25, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is disclosed for producing a vacuum and for separating condensable components present in vapor which accumulates during the production of a polymer by melt-phase polycondensation under vacuum. Vapor produced during the production of polymers by melt-phase polycondensation in at least one reaction step under vacuum is drawn of by at least one steam jet vacuum pump with a down stream injection condenser. The steam jet vacuum pump is driven with alkylene carbonate in vapor form and liquid alkylene carbonate is then supplied to the injection condenser as coolant.
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