PROCESS FOR PRODUCING POLYESTER

PROBLEM TO BE SOLVED: To provide a process for producing a polyester wherein the usage of terephthalic acid and ethylene glycol is minimized while stable production is possible at a low cost. SOLUTION: A polyester is produced by reusing, as a part or the whole of main raw material, (1) a distillate...

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Bibliographische Detailangaben
Hauptverfasser: AYABE TOSHIHARU, TANIGUCHI TOMOHIRO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a process for producing a polyester wherein the usage of terephthalic acid and ethylene glycol is minimized while stable production is possible at a low cost. SOLUTION: A polyester is produced by reusing, as a part or the whole of main raw material, (1) a distillate comprising mainly ethylene glycol, generated through an esterification reaction and/or a polycondensation reaction and (2) a cleaning fluid comprising mainly ethylene glycol, discharged after cleaning a polyester oligomer catching unit between a polycondensation reactor and a pressure reducing device with ethylene glycol.