TH74365B - Industrial processes for the production of aromatic carbonates - Google Patents

Abstract

It is the purpose of the invention to prepare For the case of aromatic production Carbonates with diaryl carbonates as the main product By using alkyl aryl carbonate as the starting material, which can be obtained Through the reaction Transesterification between dialkyl carbonate and aromatic monohydroxy compounds by means of continuous multi-layer distillation columns with active catalyst and continuous feeding of the initial material. To Continuous multi-layer distillation column The specific process through which diaryl carbonate to be produced can be stable, high selectivity and high production stability. It is a long period of time on industrial sizes of at least 1 ton per hour, although several proposals have been associated with Processes for producing aromatic carbonate by means of Reactive distillation method All of these are small and lab scale. A brief and not entirely disclosed period of time regarding a specific process or device. That makes it possible to mass-produce on an industrial scale in accordance with this invention. Has been prepared Continuous multi-layer distillation column Specific and also have been prepared The specific process that enables the manufactured diaryl carbonate can have high selectivity and highly stable production conditions. It is a long time on a scale of not less than 1 ton per hour from alkylaryl carbonate.

Claims (1)

1. A process for producing aromatic carbonates in which diary-carbonate is the primary product from the starting material. Containing alkyl aryl carbonate, which can be obtained through the reaction Transesterification between dialkyl carbonate and monohydroxy aromatic compounds comprising a layer of (i) continuous feeding of such initial material into multiple distillation columns. The continuous layer in which the catalyst is present. (Ii) Performing the reaction in the column to produce the dialkill carbonate.