Process for producing 4,4'-dihydroxydiphenylsulfone of high puri

Details Process for producing 4,4'-dihydroxydiphenylsulfone of high puri Process for producing 4,4'-dihydroxydiphenylsulfone of high puri

1978-04-14

1979-07-24

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

203 28, C07C14710

Patent

active

041622707

ABSTRACT:
In a process for producing 4,4'-dihydroxydiphenylsulfone by reacting phenol with sulfuric acid in the presence of a solvent, an improvement which comprises using at least a member selected from the group consisting of chlorobenzene, dichlorobenzene, trichlorobenzene, chlorotoluene, diethylbenzene, xylene, decalin, tetralin and tetrachloroethane as the solvent and removing said solvent progressively and finally substantially completely from the mixture while maintaining the reaction mixture at a temperature of about 160.degree. to about 200.degree. C. to effect precipitation of 4,4'-dihydroxydiphenylsulfone and isomerization of 2,4'-dihydroxydiphenylsulfone to 4,4'-dihydroxydiphenylsulfone.

REFERENCES:
patent: 2833828 (1958-05-01), Sauls
patent: 3297766 (1967-01-01), Bradley et al.
patent: 3318956 (1967-05-01), Mausner
patent: 3383421 (1968-05-01), Fox et al.
patent: 3855312 (1974-12-01), Horner
patent: 4012451 (1977-03-01), Enoki et al.
patent: 4016210 (1977-04-01), Horner et al.

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