| 摘要 |
PURPOSE: To economically and advantageously produce a colorless and high- quality bisphenol A by concentrating a reactional mixture of phenol with acetone, then crystallizing the concentrate, thermally melting the prepared crystal, removing the phenol, heating the resultant melt in the coexistence of steam and then removing the phenol. CONSTITUTION: The condensing reaction of an excessive amount of (A) phenol with acetone is carried out in the presence of a strong acidic cation exchange resin catalyst and the resultant reactional mixture containing (B) the bisphenol A, the unreacted compound (A), water, etc., as necessary, is concentrated to crystallize (C) an adduct of the compounds (B) to (A) according to the vacuum cooling, evaporation and crystallization. The resultant crystal is subsequently separated and recovered. The adduct (C) is then thermally melted and the compound (A) is subsequently removed by distillation. The prepared reactional mixture is heated in the coexistence of steam in a stripping column to remove the compound (A). Water, recovered from the column top and containing the compound (A) is circulated and reutilized for the vacuum cooling, evaporation and crystallization. Thereby, the compound (B) is recovered and obtained from the column bottom. |
