Continuous production of aromatic carbonates

Details Continuous production of aromatic carbonates Continuous production of aromatic carbonates

1993-10-05

1995-01-10

Lee, Mary C.

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

Organic compounds

Carbonate esters

558274, C07C 6996

Patent

active

053809084

ABSTRACT:
A process for continuously producing aromatic carbonates comprising continuously feeding a dialkyl carbonate, an aromatic hydroxy compound, and a catalyst to a reactor equipped with a distillation tower, continuously distilling off a by-produced aliphatic alcohol from the distillation tower so as to keep the aliphatic alcohol concentration in the reactor at 2% by weight or less, and continuously withdrawing produced alkylaryl carbonate and/or diaryl carbonate and the catalyst from the reactor; and a process for continuously producing a diaryl carbonate comprising continuously feeding an alkylaryl carbonate and a catalyst to a reactor equipped with a distillation tower, continuously distilling off a by-produced dialkyl carbonate from the distillation tower so as to keep the dialkylcarbonate concentration in the reactor at 2% by weight or less, and continuously withdrawing the produced diaryl carbonate and the catalyst from the reactor are disclosed. Continuous production of aromatic carbonates can be performed in a stable manner without being accompanied by clogging of a distillation tower.

REFERENCES:
patent: 4045464 (1977-08-01), Romano et al.
patent: 5210268 (1993-05-01), Fukuoka et al.

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