PROCESS AND SYSTEM FOR PRODUCING PET GRANULES
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United States of America Patent
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Sep 14, 2017
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Jul 8, 2015
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Jul 22, 2014
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Abstract
A process and a system for producing polyethylene terephthalate (PET) granules by transesterification of dimethyl terephthalate with ethylene glycol or by esterification of (fiber) purified terephthalic acid with ethylene glycol suitable for further processing to form packaging films and bottles, comprising the steps of polycondensation, granulation and latent heat crystallization, aftertreatment of the crude granules to adjust the polymer quality values required for the further processing, in particular the intrinsic viscosity, the acetaldehyde content and the moisture content, wherein the aftertreatment is carried out in multiple moving bed tubular reactors operated in parallel.
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