Method and device for the production of polytrimethylene terephthalate
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United States of America Patent
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May 29, 2007
Grant Date -
Sep 23, 2004
app pub date -
Apr 16, 2002
filing date -
May 25, 2001
priority date (Note) -
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Abstract
In a process for producing polytrimethylene terephthalate by esterification of terephthalic acid with 1,3-propanediol and polycondensation, the vapors formed are rectified , the liquid phase is recirculated to the process, and the lower-boiling components are condensed. To obtain an almost completely stripped condensate, the condensate is circulated and stripped with air and the exhaust air is subjected to a catalytic oxidation.
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