Basf Aktiengesellschaft

Michael Stumpp

Peter Neumann

Heinz Eilingsfeld

Helmut Reichelt

Bernd Hupfeld

Gerhard Schaefer

Michael Bergner

Wolfgang Ruehenback

A process for the preparation of bis(4-chlorophenyl) sulfone, wherein sulfur trioxide, dimethyl sulfate and chlorobenzene are reacted with each in a single reaction at a temperature of from 50.degree. to 100.degree. C.

Process for the preparation of bis(4-chlorophenyl) sulfone

A process for the preparation of bis(4-hydroxyphenyl) sulfone by reacting phenol with sulfuric acid at a temperature of from 140.degree. to 230.degree. C., wherein the sulfuric acid is metered in to the phenol only after the reaction temperature has been reached, the phenol and sulfuric acid are used in a molar ratio of from 1:1 to 25:1 and the reaction is carried out in the absence of an inert solvent.

Process for the 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.

Preparation of bis(4-hydroxyphenyl)sulfone

Bis-(4-chlorophenyl) sulfone is prepared by reacting chlorobenzene with sulfuric acid at from 200.degree. to 250.degree. C. by a process in which a condensing agent is added.

Preparation of bis-(4-chlorophenyl) sulfone

A process for the isolation of 4,4'-dichlorodiphenyl sulfone from a mixture of dichlorodiphenyl sulfones in which the ratios of the masses of 2,4'-dichlorodiphenyl sulfone and 3,4'-dichlorodiphenyl sulfone to the mass of 4,4'-dichlorodiphenyl sulfone are respectively from 0.5% to 20% and from 0.5% to 30% by treating the mixture with an alkanol at temperatures of from 20.degree. C. to 250.degree. C., cooling, and separating the pure 4,4'-dichlorodiphenyl sulfone that precipitates.

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Deidesheim, Germany

Michael Stumpp