METHOD OF PRODUCING DIARYL CARBONATE

FIELD: chemistry.SUBSTANCE: invention relates to a method of producing diaryl carbonate coupled with electrolysis of the formed alkali metal chloride-containing spent aqueous solutions. The method of producing diaryl carbonate and treating at least a portion of the formed alkali metal chloride-containing solution comprises the following steps: a) reacting phosgene, obtained from reacting chlorine with carbon monoxide, with at least one monophenol in the presence of a base and, optionally, in the presence of a base catalyst to form diaryl carbonate and an alkali metal chloride-containing solution, b) separating and extracting the diaryl carbonate formed at step (a), c) separating the alkali metal chloride-containing solution remaining after step (b) from solvent residue and, optionally, catalyst residue with subsequent treatment with adsorbents, wherein before treatment with adsorbents, pH of the alkali metal chloride-containing solution is set equal to or lower than 8, d) electrochemical oxidation of at least a portion of the alkali metal chloride-containing solution from step (c), which takes place with formation of chlorine, an alkali metal hydroxide solution and in the corresponding case hydrogen, wherein at least a portion of the obtained chlorine is used to produce phosgene and/or e) returning at least a portion of the alkali metal hydroxide solution obtained at step (d) to step (a) for producing diaryl carbonate, where at least a portion of the alkali metal chloride-containing solution formed at step (c) is returned to step (a).EFFECT: along with other advantages, the disclosed method improves recycling through electrolysis of the alkali metal chloride-containing solution formed when producing diaryl carbonate.12 cl, 4 ex Изобретение относится к способу получения диарилкарбоната в сочетании с электролизом образующихся содержащих хлорид щелочного металла отработанных водных растворов. Способ получения диарилкарбоната и переработки, по крайней мере, одной части образующегося при этом содержащего хлорид щелочного металла раствора включает следующие стадии: а) взаимодействие фосгена, полученного при взаимодействии хлора с монооксидом углерода, с по крайней мере одним монофенолом в присутствии основания и, при необходимости, в присутствии основного катализатора с образованием диарилкарбоната и содержащего хлорид щелочного металла раствора, б) отделение и выделение образовавшегося на стадии а) диарилкарбоната, в) отделение остающегося после стадии б) содер