PROCESS FOR PREPARING 4,4'-DIHYDROXYDIPHENYL SULFONE

Title:

PROCESS FOR PREPARING 4,4'-DIHYDROXYDIPHENYL SULFONE

Document Type and Number:

WIPO Patent Application WO/1991/004245

Kind Code:

A1

Abstract:

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.

Inventors:

OGATA EIJI (JP)
NATE NOBUYUKI (JP)

Application Number:

PCT/JP1990/001179

Publication Date:

April 04, 1991

Filing Date:

September 14, 1990

Export Citation:

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Assignee:

KONISHI CHEM IND (JP)

International Classes:

C07C315/00; C07C315/04; C07C317/22; (IPC1-7): C07C315/00; C07C317/22

Foreign References:

EP0293037A1	1988-11-30
JPS5198239A	1976-08-30
JPS61243059A	1986-10-29

Other References: