Patent ID: 8470220

Claim:
A method for the production of polyester granulate with a low acetaldehyde content from a melt which is discharged from a polycondensation reactor, comprising keeping the melt in the discharge region of the polycondensation at a temperature between 270-285° C. in communication with a gas chamber at a reduced pressure, by using a device comprising a polycondensation reactor, at least the last stage of which is configured as a disc reactor in which, with avoidance of a sump, the melt is transported directly from disc to disc by a combination of rotating discs and static strippers fitted on the circumference of the reactor and a discharge region, from which the melt is conveyed directly into a discharge unit by static strippers without an accumulation of melt occurring therein, and comprising discharging the melt from the polycondensation reactor into a melt pipe which leads to a granulation unit, wherein the melt in the melt pipe up to granulation unit has a dwell time <4 min.