ポリエチレンテレフタレ-ト連続重縮合反応のシミュレ-ション

概要

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In the polyethylene terephthalate (PET) condensation process, the reaction byproduct removal rate affects the progress of the reaction, because the polycondensation rate of PET is slow and its equilibrium constant is small. To study the rate of this reaction separately from that of byproduct removal, the influence of temperature, pressure, catalyst concentration, residence time and diffusion surface area on the reaction are taken into consideration in this paper.<BR>Experiments were carried out with a 0.5 t/day continuous polycondensation pilot plant. Using a complete-mixing tank-series model with back mixing of the horizontal reactor, the number average degree of polymerization (DP) obtained in the present experiment was found to be in good agreement with calculated values.<BR>The activation energy of the degradation reaction was larger than that of the polycondensation reaction. Considering quality, the production temperature 280-285°C is too high to produce PET. But pressure reduction has influence on the polycondensation without affecting the degradation.<BR>The calculated value deviation of DP from the experimental data were found to be within±5%.
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