Schematic view of the batch solid state process

Reactor type Vertical reactor, tumble dryer 

The S5Tithesis of PET in a DMT-BPU (batch polycondensation unit) process is a two step reaction  

After reaching the end temperature of the ester interchange process which depends on the type of PET (technical PET, textile PET), the catalyst for the polycondensation process is added. 

The polycondensation process is finished when the desired intrinsic viscosity, which depends on the type of product, is reached. The PET is pressed out by N2, cooled with water (normal/deionised), cut, dried and sieved. The cut PET chips are then stored in storage silos for further processing. 

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Figure 10.5 Schematic view of the batch solid state process...

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