| 摘要 |
PURPOSE: A process for producing high quality polyester is provided for dividing untreated ethyleneglycol from impurity as a by-product in a preferred efficiency to reuse it in the polymerization process. CONSTITUTION: The process for preparing high quality polyester comprises providing terephthalic acid and/or its ester derivative and ethylene glycol as raw material into an esterification reactor; introducing the obtained low polymer into a polycondensation reactor; using centrifugal separator to precipitate impurities of the ethylene glycol containing efflux from the esterification and/or polycondensation reactors and to purify the ethylene glycol; and reusing the purified product in the polymerization process. The centrifugal separator satisfies the equation of >=T 2e(exp7)Z(exp1.8401), wherein Z and T represent the efficiency of centrifugal separation and the resident time in the separator, respectively.
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