Method and device for producing vacuum in the production of polyesters and copolyesters
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United States of America Patent
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Aug 16, 2011
Grant Date -
Apr 23, 2009
app pub date -
Sep 16, 2008
filing date -
Oct 23, 2007
priority date (Note) -
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Abstract
The invention relates to a method and a device for producing vacuum in the production of polyesters and copolyesters; unrectified vapors from at least one esterification or transesterification stage is preferably used as a driving medium in gas jet pumps for producing the vacuum in one or more polycondensation stages.
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