A METHOD TO OBTAIN VISUALLY PURE BISPHENOL A

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 c...

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Hauptverfasser: KIEDIK, MACIEJ, SZYMAŃSKI, KAZIMIERZ, KAŁĘDKOWSKA, MAŁGORZATA, SMOLNIK, RYSZARD, KOŚCIUK, RYSZARD, KSIĄŻEK, KRZYSZTOF, RZODECZKO, ANNA, KOLT, JÓZEF, MRÓZ, JERZY
Format: Patent
Sprache:eng ; pol
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Zusammenfassung: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.