| 摘要 |
<p>A process for continuously producing an aromatic carbonate or its mixture corresponding to the starting material comprising dialkyl carbonate, alkyl aryl carbonate or a mixture thereof and the reactant comprising aromatic hydroxy compound, alkyl aryl carbonate or a mixture thereof, said process comprising feeding the starting material and the reactant continuously to a continuous multistage distillation column to effect transesterification between them in the presence of a catalyst, and withdrawing the aromatic carbonate or its mixture formed as the high-boiling product in liquid form continuously from the lower part of the column, while withdrawing the by-products formed as the low-boiling products in gaseous form continuously from the upper part of the column by distillation to effect transesterification between the starting material and the reactant. This process makes it possible to produce efficiently at a high reaction rate and a high yield an aromatic carbonate which is useful as the starting material for producing an aromatic polycarbonate or various isocyanates without using toxic phosgene.</p> |
