Method and device for the production polyethyleneterephthalate
AssigneeZimmer, Inc.
InventorRandolf Reimann
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Abstract
In a process of producing polyethylene terephthalate by esterification of terephthalic acid with ethylene glycol and polycondensation, the vapors formed are rectified, the liquid phase is recirculated to the process, and the lower-boiling components are condensed. To obtain an almost completely stripped condensate, it is provided to circulate the condensate and strip the same with air as well as to subject the exhaust air to a catalytic oxidation.
Claims8
A process for the continuous production of polyethylene terephthalate, in which terephthalic acid is esterified with ethylene glycol, thereafter prepolycondensated and subsequently polycondensated, the vapors formed being rectified, the liquid phase substantially consisting of ethylene glycol being recirculated to the production process, and the vapor phase containing the lower-boiling components acetaldehyde, 2-methyl-1,3-dioxolane, 1,4-dioxane and possibly acetic acid being condensed, characterized in that the vapor condensate is circulated, stripped with air, and an aliquot of the stripped vapor condensate is discharged.
Dependencies are inferred from the claim text.