Process for preparing high-purity bisphenol a

Details Process for preparing high-purity bisphenol a Process for preparing high-purity bisphenol a

C - Chemistry, Metallurgy

07

C

260/617.7

C07C 37/20 (2006.01) C07C 37/84 (2006.01) C07C 39/16 (2006.01)

Patent

CA 1311498

27979-10 ABSTRACT OF THE DISCLOSURE Disclosed is a method for preparing high-purity bisphenol A. The method comprises a principal process and a sub- process. The principal, process comprises a first reaction step for reacting phenol with acetone, a first concentration adjusting step, a first crystallization step for precipitating crystals of the adduct of bisphenol A with phenol, a first separation step for separating a solution containing the crystals of the adduct into the crystals and the mother liquor and a phenol removing step for removing phenol from the crystals of the adduct. The sub-process comprises a second reaction step for reacting p-isopropenylphenol with phenol, a second concentration adjusting step, a second crystallization step, a second separation step for separating a solution containing the second crystals of the adduct into the second crystals and the second mother liquor and a cleaving step. The first mother liquor from the principal process is fed to the sub-process and the second crystals of the adduct from the sub- process are fed to the principal process. Also disclosed is a method for preparing high-purity bisphenol A which comprises a principal process and a sub-process. The principal process comprises a first reaction/catalyst removing step for reacting phenol with acetone and removing the catalyst, a crystallization step for precipitating the adduct of bisphenol A with phenol, a solid-liquid separation step for separating the reaction solution into the crystals of the adduct and the mother liquor and a phenol removing step for removing phenol from the adduct crystals. The sub-process comprises a second reaction/catalyst removing step for reacting p-isopropenylphenol with phenol and removing the 27979-10 catalyst, a second phenol removing step, a distillation step for separating bisphenol A and low boiling and high boiling substances and a cleaving step. The mother liquor from the principal process is fed to the sub-process and the distilled bisphenol A from the sub-process is fed to the principal process.

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