Method and installation for increasing the intrinsic viscosity of polyester material by solid phase polycondensation
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United States of America Patent
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Jan 3, 2012
Grant Date -
Nov 26, 2009
app pub date -
Jun 13, 2006
filing date -
Jun 14, 2005
priority date (Note) -
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Abstract
An installation for increasing the intrinsic viscosity of a polyester material by solid phase polycondensation (SSP) comprises a heatable reaction container (2, 2') in which the polyester material (P) can be left to reside at a predetermined thermal treatment temperature for a predetermined residence time until it has reached a desired intrinsic viscosity, and a cooling container (6, 6') arranged downstream of the reaction container, the cooling container (6, 6') being designed for cooling the polyester material discharged from the reaction container to a first cooling temperature which is lower than the reaction temperature. Downstream of the cooling container (6, 6'), a polyester material separator (7) is arranged which is designed for diverting the polyester material flow to a polyester material processing machine (8) and/or to an intermediate storage container (10).
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