| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a bisphenol A superior in transparency or hue. SOLUTION: The processes for manufacturing the bisphenol A comprises a condensation reaction process (A) of phenol and acetone in the presence of an acid catalyst; a concentration process (B) of the reaction mixture; a crystallization/solid-liquid separation process (C) for separating an adduct of bisphenol A and phenol from a mother liquor; an isomerization process (D) for isomerizing the whole of the mother liquor with an isomerizing catalyst, and circulating the isomerized liquid to the process (A) and/or the process (B); also at need, a recovery process (E) for recovering the adduct of bisphenol A and phenol from a part of the isomerized liquid treated in the process (D); an adduct decomposing process (F) for removing phenol from the adduct obtained in the process (C) to make a bisphenol A melt; and a granulation process (G) for granulating the bisphenol A melt to be a product prill, wherein a free acid removing process is provided in the process (D) for removing a free acid existing in the mother liquor or the isomerized liquid. COPYRIGHT: (C)2008,JPO&INPIT
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