Direct coupling of melt polymerization and solid state...

Details Direct coupling of melt polymerization and solid state... Direct coupling of melt polymerization and solid state...

B - Operations, Transporting

29

B

B29B 9/12 (2006.01)

Patent

CA 2535277

Strands (5) of molten polyethylene terephthalate (PET) from a PET polycondensation reactor (4) are solidified, pelletized, and cooled only to a temperature in the range of 50~C to a temperature near the polymer Tg by contact with water. The still hot pellets (9) are conveyed, optionally followed by drying to remove water, to a PET crystallizer (20). By avoiding cooling the amorphous pellets (9) to room temperature with water and cool air, significant savings of energy are realized.

L'invention concerne des joncs de polyéthylène térephtalate (PET) fondu, provenant d'un réacteur de polycondensation de PET, qui sont solidifiés, pastillés et refroidis, uniquement jusqu'à une température de l'ordre de 50 ·C, à une température proche de la température de transition vitreuse du polymère, par contact avec l'eau. Les pastilles toujours chaudes sont transportées, puis éventuellement séchées afin d'éliminer l'eau, jusqu'à un cristalliseur de PET.

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