The present invention provides a process for producing
4,4'-dihydroxydiphenylsulfone of very high purity. In particular, the
present invention provides a process for producing
4,4'-dihydroxydiphenylsulfone of high purity comprising the steps of
subjecting phenol in combination with a sulfonating agent or
phenolsulfonic acid to a dehydration reaction in the presence of an
aromatic nonpolar solvent while suspending the resulting
dihydroxydiphenylsulfone therein, mixing the reaction suspension with a
polar solvent to at least partially dissolve the
dihydroxydiphenylsulfone, and precipitating
4,4'-dihydroxydiphenylsulfone.