To prolong the life of an acidic ion-exchange resin catalyst used in this process by removing compounds causing catalyst deterioration in the raw materials.
This production process comprises the reaction step where an excessive amount of phenol and acetone are allowed react with each other in the prensece of an acidic ion-exchange resin catalyst to form bisphenol-A, the crystal sparation step where the formed bisphenol-A is precipitated in the from of crystalline adduct with phenol and the purification step where the adduct crystals and subjected to phenol-removal treatment to give purified bisphenol-A. In this process, the phenol prepared by purifying the phenol from the crystal separation step by adsorption treatment is used at last as a part of the phenol to be allowed to reach with acetone and the amount of the adsorbent is 3-25vol.% based on the ion-exchange resin catalyst.
SAKURA KATSUHIKO
JIMI KAZUYOSHI
ONISHI SHOHEI
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