| 摘要 |
The invention relates to a process and installation for the production of polyethylene terephthalate (PET) pellets by transesterification of dimethyl terephthalate with ethylene glycol, or by esterification of (fibre-) pure terephthalic acid with ethylene glycol, suitable for the further processing to packaging film and bottles, comprising the steps of polycondensation, granulation and latent heat crystallization, post-treatment of the raw granules for setting the polymer quality values which are required for further processing, in particular the intrinsic viscosity, the acetaldehyde and moisture content, wherein the post-treatment is carried out in a plurality of moving bed tubular reactors which are operated in parallel. |
