| 摘要 |
An object of present invention is to provide a process of producing bisphenol A, and more particularly a process of producing bisphenol A having high purity and an excellent hue. In the present invention, in a crystallization step to form the slurry containing adduct crystals, (a) a fed solution of bisphenol A in phenol is cooled at the temperatures of at least two steps to form a slurry containing adduct crystals, (b) at least two crystallization stages having different cooling temperatures are provided, and (c) when the solid fraction of the slurry is A [% by weight] in the final crystallization stage prior to transporting the slurry into the solid-liquid separation step and the solid fraction of the slurry is B [% by weight] in the crystallization stage in which crystals are first formed, the value of B/A is kept 0.7 or less.
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