Oblon, Spivak, McClelland, Maier & Neustadt
Preparation of bis(4-hydroxyphenyl)sulfone
 A process for the preparation of bis(4-hydroxyphenyl)sulfone by reacting phenol with sulfuric acid in the presence of a solvent at from 130.degree. to 220.degree. C. and in the presence or absence of a sulfonating assistant, wherein the bis(4-hydroxyphenyl)sulfone formed is selectively deposited on a nucleating surface during or after the reaction, and thus removed from the reaction medium. 
BASF Aktiengesellschaft
C C
C07C C07C
inventional inventional
Wolfgang Michael Peter Michael
Ruehenback Stumpp Neumann Bergner