Method of extractive separation of diaryl carbonates and the ori

Details Method of extractive separation of diaryl carbonates and the ori Method of extractive separation of diaryl carbonates and the ori

1997-02-05

1998-01-27

Ambrose, Michael G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

558271, 558272, 558273, C07C 6808

Patent

active

057124060

ABSTRACT:
Diaryl carbonate and an aromatic hydroxy compound are simultaneously separated from a crude reaction mixture for producing diaryl carbonates by oxidative carbonylation of the aromatic hydroxy compound and containing the diaryl carbonate and excess hydroxy compound together with the catalyst system, consisting of a noble-metal catalyst, co-catalyst, quaternary salt and a base. The crude reaction mixture is mixed with a covalent aprotic extraction agent, a phase separation is carried out into a donor phase containing the catalyst system and a recipient phase containing the diaryl carbonate and the hydroxy compound in concentrated form, and the diaryl carbonate and the hydroxy compound are isolated from the recipient phase.

REFERENCES:
patent: 5328615 (1994-07-01), Pacheco et al.
patent: 5489703 (1996-02-01), Pacheco et al.

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