| 摘要 |
<p>A process for preparing 4,4'-dihydroxydiphenyl sulfone which comprises conducting a dehydration reaction of phenol with a sulfonating agent to prepare 4,4'-dihydroxydiphenyl sulfone, characterized by allowing the reaction to proceed while suspending the formed sulfone in mesitylene as a reaction medium; and another process for preparing 4,4'-dihydroxydiphenyl sulfone, characterized by heating 4,4'-dihydroxydiphenyl sulfone, formed by the dehydration reaction, in the form of a suspension thereof in mesitylene and/or in the form of a solid after the removal of the liquid component at an isomerization temperature or above where 2,4'-dihydroxydiphenyl sulfone is converted into 4,4'-dihydroxydiphenyl sulfone, thereby allowing 2,4'-dihydroxydiphenyl sulfone as a by-product to isomerize into 4,4'-dihydroxydiphenyl sulfone.</p> |
