PROCESS FOR PRODUCING AROMATIC CARBONATE ON INDUSTRIAL SCALE

摘要

With respect to the continuous production of an aromatic carbonate containing a diaryl carbonate as a main product, comprising providing as a raw material an alkyl aryl carbonate obtained through an ester exchange reaction between a dialkyl carbonate and an aromatic monohydroxy compound and continuously feeding the raw material into a continuous multistage distillation column having a catalyst packed therein, it is intended to provide a practical process for stable production of a diaryl carbonate with high selectivity and high productivity on an industrial scale of = 1 ton/hr for a prolonged period of time. Although there are a multiplicity of proposals regarding the process for producing aromatic carbonates according to reaction distillation technology, they all are on a laboratory level conducted on a small scale for a short term and there has been no disclosure of practical process and apparatus enabling mass production on an industrial scale. There is provided a specified continuous multistage distillation column, and provided a practical process for stable production of a diaryl carbonate from an alkyl aryl carbonate containing specified amounts of dialkyl carbonate and aromatic monohydroxy compound with high selectivity and high productivity on an industrial scale of = 1 ton/hr for a prolonged period of time.