| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a dihydroxydiphenylsulfone isomer mixture including more 2,4-dihydroxydiphenylsulfone through attaining isomerization equilibrium in a short time by isomerization reaction of 4,4'- dihydroxydiphenylsulfone. SOLUTION: This method for producing the dihydroxydiphenylsulfone isomer mixture including 2,4'-dihydroxydiphenylsulfone comprises heating 4,4'- dihydroxydiphenylsulfone or a 4,4'-dihydroxydiphenylsulfone isomer mixture including >=85 wt.% of 4,4'-dihydroxydiphenylsulfone in the presence of <=1 wt. time of phenol and <=20 mol% of sulfuric acid at >=160 deg.C.
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