| 摘要 |
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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