Process and apparatus for producing polyethylene terephthalate
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United States of America Patent
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Mar 8, 2005
Grant Date -
Sep 2, 2004
app pub date -
Apr 23, 2004
filing date -
May 25, 2001
priority date (Note) -
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Abstract
In a process of producing polyethylene terephthalate by esterification of terephthalic acid with ethylene glycol 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, condensate is circulated and stripped the same with air, and the exhaust air is subjected to a catalytic oxidation.
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