Process for producing bisphenol A

A bisphenol A/phenol adduct is separated through crystallization from a reaction mixture. The resultant mother liquor is wholly subjected to isomerization and then recycled to a condensation reaction step, a concentration step, or a crystallization/solid-liquid separation step. Blowing is conducted simultaneously with the recycling in order to prevent impurities from accumulating in the system. Thus, bisphenol A and phenol are recovered from the liquid resulting from the isomerization, whereby high-quality bisphenol A can be efficiently produced.