| 摘要 |
PURPOSE:To provide the method for producing bisphenol A efficiently preventing the accumulation of by-products and impurities in the reaction system and obtaining the highly pure bisphenol A as a crystal adduct with phenol. CONSTITUTION:The method for producing the bisphenol A by reacting acetone with an excessive amount of phenol in the presence of an acid catalyst comprises (i) a distillation process comprising feeding at least one of the circulated mother liquid into a distillation tower and subsequently distilling off 50-90wt.% of the mother liquid fed into the distillation tower to obtain the distillate containing phenol, (ii) a heating process comprising heating the bottom liquid of the distillation tower obtained in the process (i) in the presence of a basic catalyst at 200-350 deg.C, (iii) a vacuum-recovering process for vacuum-distilling the product obtained in the process (ii) to obtain a distilled vapor containing the phenol and isopropenylphenol, (iv) a rapidly cooling process for bringing the distilled vapor obtained in the process (iii) into contact with the distillate obtained in the process (i) to rapidly cool the distilled vapor, and (v) a circulation process for circulating the rapidly cooled product obtained in the process (v) to the reaction process. |
