Process and polycondensation apparatus for the treatment of contaminated ethylene glycol
AssigneeJohn Brown Deutsche Engineering GmbH
InventorsJurgen Rink, Klaus Stemmer, Rudolf Geier
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Abstract
The invention relates to a process for the treatment of contaminated ethylene glycol resulting during a polycondensation process for the production of polyester. In the course of this polycondensation process contaminated ethylene glycol is continuously predistilled, subjected as a distillation residue to secondary distillation, condensed and then returned to the polycondensation process as decontaminated ethylene glycol, so that an in-line recovery is achieved, which makes superfluous an external distillation installation for the treatment of contaminated ethylene glycol.
Claims3
Process for the treatment of contaminated ethylene glycol resulting from a polycondensation process for the production of polyester, according to which contaminated ethylene glycol is subjected to preliminary distillation for separation from water and low-boiling fractions, as a distillation residue is subjected to secondary distillation and the ethylene glycol as a distillate is condensed, characterized in that in the course of the polycondensation process contaminated ethylene glycol is continuously subjected to preliminary distillation, subjected to secondary distillation as a distillation residue, under vacuum, condensed and as decontaminated ethylene glycol resupplied to the polycondensation process.
Dependencies are inferred from the claim text.