Melt polycondensation processes to manufacture poly(ethylene terephthalate) with high molecular weight have been realized successfully in a novel reactor, grid falling film tower, in which polymer melt flows through multi-layers grids from top to bottom to form falling film owing to gravity and large gas–liquid interfacial area is generated stably and uniformly by the support of combs. The surface velocity field on falling film was measured to characterize surface renewal of falling film. Little back-mixing exists in down flowing stream, and the fluid flow in GFFT behaves as plug flow. A model has been proposed for continuous PET melt polycondensation process in grid falling film tower and veri fied by pilot-scale experimental data. Calculated degree of polymerization axial distribution can provide some valuable information for how to match the core structure with the progress of PET polycondensation process.
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Xi et al. (2009) studied this question.
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