The present invention provides a process for producing dihydroxydiphenylsulfone
wherein trihydroxytriphenylsulfone and coloring impurities are effectively removed
without altering the isomeric composition of dihydroxydiphenylsulfone. In particular,
the present invention provides a process for producing dihydroxydiphenylsulfone
comprising the steps of dissolveing or suspending in an aqueous solvent crude dihydroxydiphenylsulfone
containing trihydroxytriphenylsulfone, adjusting the pH to 5-7, optionally cooling,
and separating the crystalline dihydroxydiphenylsulfone thus precipitated.