Verfahren zur Aufarbeitung von diarylcarbonhaltigen Reaktionsmischungen

摘要

The invention relates to a method for reprocessing reaction mixtures containing diaryl carbonate, an aromatic hydroxy compound, water, a base, a quaternary salt and optionally, other catalyst components, said reaction mixtures being obtained in the production of diaryl carbonates by direct carbonylation of aromatic hydroxy compounds. According to the inventive method, an adduct of diaryl carbonate and an aromatic hydroxy compound is crystallised from the reaction mixture and a distillate containing the aromatic hydroxy compound is removed from the liquid phase. The liquid phase is then returned to the direct carbonylation reaction step. The inventive method minimises the deactivation of the catalyst system which is circulated.