industrial process for the production of high purity diaryl carbonate, high purity diphenyl carbonate produced by such a process, process for producing an aromatic polycarbonate, aromatic polycarbonate produced by such process, and apparatus for producing a carbonate high purity diaryl

摘要

INDUSTRIAL PROCESS FOR PRODUCTION OF HIGH PURPOSE DIARILY CARBONATE, HIGH PURPOSE DIPHYLEN CARBONATE PRODUCED BY PROCESS, PROCESS FOR PRODUCTION OF AROMATIC POLYCARBONATE FOR PRODUCT AROZONE PRODUCT POLYCARBONATE OF HIGH PURITY DIARIL. It is an object of the present invention to provide a specific process which allows high purity diaryl carbonate which can be used as a raw material of a high quality and high performance polycarbonate to be produced stably for an extended period of time. on an industrial scale of not less than 1 ton / hr using as a starting material a reaction mixture containing an alkylaryl carbonate obtained by a transesterification reaction between a dialkyl carbonate and a monohydroxyl compound. Although there have been several proposals regarding processes for producing reaction mixtures containing aromatic carbonates by a reactive distillation method or the like, all of these were on a small scale and short operating time at the laboratory level, and none existed. disclosures about a specific process or apparatus that enables mass production on an industrial scale from such a reaction mixture of a high purity diaryl carbonate that can be used as a raw material of a high quality polycarbonate and high performance. According to the present invention, there is provided a specific process which allows a high purity diaryl carbonate to substantially contain no intermediate boiling by-products or high melting by-products and important as a raw material of a high polycarbonate. quality and high performance is produced stably for an extended period of time on an industrial scale of not less than 1 ton / hr by using as a starting material a reaction mixture containing an alkyl aryl carbonate which has been obtained. by a transesterification reaction between a dialkyl carbonate and a monohydroxyl compound and subjecting this starting material to a transesterification reaction using a reactive distillation column, and then subjecting a high boiling reaction mixture obtained from the bottom of the separation / purification reactive distillation column by distillation using a high boiling material separation column A, a diaryl carbonate purification column B and an intermediate boiling material separation column C, in that order, each of which columns comprises one column. specific, continuous distillation medium, high purity diaryl carbonate being obtained as a side-cut component from purification column B.