Abstract
The simulated results by a computer were shown for the continous direct esterification in the first reactor between terephthalic acid (TPA) and ethylene glycol (EG) under reduced pressures in order to find the operational conditions in oligomer production of poly(ethylene terephthalate) with the lower content of diethylene glycol (DEG). It has been inferred from the results of simulation that the lower reaction pressure brings about the suppression of DEG formation due to the side reactions but it decreases the progress of esterification and polymerization due to main reactions. It has confirmed that the reaction mixtures of AV≒0.6 eq kg−1 becomes a clear liquid without undissolved TPA (this point is the clearing point), independently of reaction conditions and the clearing point predicted from simulation results coincides with the experimental observation. Furthermore, a few cases of simulated results were applied for a commercial production plant in good agreement with the experimental results. The agreement suggests to support the validity of the present model for the precise predictions for a production plant.
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Yamada, T. Influence of Reaction Pressure below Atmosphere on Esterification Reaction between Terephthalic Acid and Ethylene Glycol. Polym J 24, 43–61 (1992). https://doi.org/10.1295/polymj.24.43
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DOI: https://doi.org/10.1295/polymj.24.43
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