| 摘要 |
<p>A bisphenol-A production method including: (A) a step in which BPA is generated in a reactor in which excess phenol and acetone are subjected to a condensation reaction in the presence of an acid catalyst, and a reaction mixture containing BPA is obtained; (B) a step in which the reaction mixture is concentrated and a concentrated liquid is obtained; (C) a step in which the concentrated liquid, subsequent to the crystallization thereof, is separated into a solid part and a mother liquor by solid/liquid separation; (D) a step in which, from within the mother liquor, at least part of the mother liquor that is present in the system is isomerized; (E) a step in which the isomerized solution, subsequent to the crystallization thereof, is separated into a solid part and a mother liquor by solid/liquid separation; and (F) a step in which, from within the mother liquor obtained in the previous step, at least part of the mother liquor that is present in the system is subjected to an alkaline decomposition treatment, phenol and/or IPP are recovered, and, without being passed through a recombination reactor, are supplied to the reactor from step (A). The method enables the quantity of raw materials that are supplied and used to be effectively reduced, and bisphenol-A of high quality to be produced.</p> |
