| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing 4,4'-BPS, comprising reacting phenol with sulfuric acid in an aliphatic saturated hydrocarbon solvent under refluxing, which enables the efficient removal of the by-produced water and the improvement in the yield of the 4,4'-BPS by using such proper mixed solvents as enhancing the yield of the 4,4'-BPS in the reaction process and the subsequent process. SOLUTION: This method for producing 4,4'-bisphenolsulfone, comprising reacting phenol with sulfuric acid in mixed solvents comprising an aliphatic saturated hydrocarbon having a boiling point of >=175 deg.C and a solvent capable of dissolving the phenol and having a boiling point of <=170 deg.C under refluxing, while removing the by-produced water, and distilling off the solvent capable of dissolving the phenol and having a boiling point of <=170 deg.C from the reaction system. It is preferable that the solvent capable of dissolving the phenol and having a boiling point of <=170 deg.C is distilled off from the reaction system after the reaction is finished. Isoper H [trade mark of Exon Chem. (KK)] is preferable as the aliphatic saturated hydrocarbon.
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