초록 ▼

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 pho

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.

대표청구항 ▼

A process for the synthesis of a diaryl carbonate which comprises: (a) contacting a phenolic compound in a first reaction zone with an equimolar amount or less of an alkali metal hydroxide to form an alkali metal phenoxide compound, (b) reacting said alkali metal phenoxide compound with phosgene at

A process for the synthesis of a diaryl carbonate which comprises: (a) contacting a phenolic compound in a first reaction zone with an equimolar amount or less of an alkali metal hydroxide to form an alkali metal phenoxide compound, (b) reacting said alkali metal phenoxide compound with phosgene at a temperature above the melting point of the diaryl carbonate being synthesized in a second reaction zone comprising a reactor-mixer providing a highly intimate admixture of the initial reaction system to form the diaryl carbonate, and (c) recovering substantially pure diaryl carbonate from the reaction mixture; wherein said steps (a) and (b) are carried out completely isolated from each other.