Process for producing diaryl carbonate

Details Process for producing diaryl carbonate Process for producing diaryl carbonate

1997-11-06

1999-11-09

Richter, Johann

Gas separation

558277, C07C 6996

Patent

active

059804459

ABSTRACT:
A process for producing diaryl carbonate which comprises (A) a step for producing dialkyl carbonate represented by the general formula RO--CO--OR by reacting urea with alkyl alcohol represented by the general formula ROH, (B) a step for producing both alkyl aryl carbonate represented by the general formula RO--CO--OAr and diaryl carbonate represented by the general formula ArO--CO--OAr by reacting dialkyl carbonate produced in the above step (A) with an aromatic hydroxy compound represented by the general formula ArOH, and (C) a step for producing diaryl carbonate represented by the general formula ArO--CO--OAr by allowing to conduct disproportionation reaction of unreacted alkyl aryl carbonate produced in the above step (B), wherein R shows an alkyl group and Ar shows a non-substituted phenyl group or a phenyl group substituted by alkyl group, alkoxy group, aryl group, aryloxy group or halogen.

REFERENCES:
patent: 5166393 (1992-11-01), Fukuoka et al.
patent: 5284965 (1994-02-01), Buysch et al.
patent: 5344954 (1994-09-01), Schon et al.
patent: 5565603 (1996-10-01), Saleh et al.

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