A METHOD TO OBTAIN VISUALLY PURE BISPHENOL A

摘要

In the method of the invention, the process to obtain bisphenol A from phenol and acetone in the presence of a cation exchanger which is preferably promoted with organic sulphur compounds, is carried out in two steps, while the reaction mixture is made to flow upwards in the reactor. Step I of the condensation reaction comprises a preliminary rearrangement phase to obtain an increase in the concentration of bisphenol A by 2 - 15 %, preferably 3 - 5 %, while in Step II the reaction is preferably carried out while removing part of reaction water in a continuous manner. Acetone, water and phenol are then removed from the resulting post-reaction mixture and the crude bisphenol A which is obtained as a residue is treated by distillation or fractional crystallization.