Process for producing a diaryl carbonate

Details Process for producing a diaryl carbonate Process for producing a diaryl carbonate

1997-03-10

1998-03-24

Ambrose, Michael G.

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

Organic compounds

Carbonate esters

558271, 558272, C07C 6800

Patent

active

057314535

ABSTRACT:
A diaryl carbonate with a high degree of purity is produced at a high yield by (A) subjecting (a) a diaryl oxalate and a phenol compound or (b) an alkylaryl oxalate to transesterification reaction in one or two stages in the presence of a catalyst to prepare a diaryl oxalate, while removing a by-product from the reaction system; (B) collecting the diaryl oxalate from the resultant reaction product mixture of the step (A); (C) subjecting the diaryl oxalate to a decarbonylation reaction, preferably in the presence of a phosphorous compound-containing catalyst, to convert the diaryl oxalate to a corresponding diaryl carbonate, while removing a reaction by-product comprising carbon monoxide from the reaction system; and (D) collecting the diaryl carbonate from the reaction product mixture of the step (C).

REFERENCES:
patent: 4012406 (1977-03-01), Buysch et al.
patent: 4544507 (1985-10-01), Foley
patent: 5210268 (1993-05-01), Fukuok et al.
patent: 5648510 (1997-07-01), Harada et al.
Database WPIDS on STN.RTM., Derwent Information, Ltd., (London, UK), Accession No. 75-74851W, JP50082027, abstract, 1975.
Organic Synthetic Chemistry vol. 5, Report No. 47, pp. 70-71 (1948).

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