Process for making diaryl carbonates

Details Process for making diaryl carbonates Process for making diaryl carbonates

1985-12-31

1987-09-29

Shippen, Michael L.

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

Organic compounds

Carbonate esters

C07C 6802

Patent

active

046970347

ABSTRACT:
Diaryl carbonates, for example, diphenyl carbonate, are produced continuously by a two-step process wherein an alkali metal phenoxide compound is first produced from a phenolic compound and an alkali metal hydroxide, and thereafter the alkali metal phenoxide compound is reacted with an excess of phosgene at a temperature above the melting point of the diaryl carbonate product in a highly efficient reactor-mixer. Complete separation of the process steps and intimate admixing of the three-phase (gaseous, organic and aqueous) reaction mixture allows production of diaryl carbonates at high yield while avoiding excessive production of undesirable chloroformate intermediates.

REFERENCES:
patent: 2335441 (1943-11-01), Pearson et al.
patent: 3017424 (1982-01-01), Meyer et al.
patent: 3251873 (1966-05-01), Kurkjy et al.
patent: 4012406 (1977-03-01), Buysch et al.
patent: 4016190 (1977-04-01), Bockmann et al.

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