Title:
PROCESS FOR PRODUCTION OF DIHYDROXYDIPHENYL SULFONE ISOMERIC MIXTURES
Document Type and Number:
WIPO Patent Application WO/2003/068733
Kind Code:
A1
Abstract:
A process for production of dihydroxydiphenyl sulfone isomeric mixtures which comprises reacting phenol with a sulfonating agent through dehydration in an organic solvent to form a dihydroxydiphenyl sulfone isomeric mixture comprising 4,4’-dihydroxydiphenyl sulfone and 2,4’-dihydroxydiphenyl sulfone, characterized in that phenol is used in an amount of 2 to 4 mol per mol of the sulfonating agent, that the organic solvent is used in an amount of 0.5 to 6.5 times by weight the theoretical yield of the dihydroxydiphenyl sulfone isomeric mixture, and that the objective substance is recovered from the reaction product in the form of an isomeric mixture.
Inventors:
OI FUMIO (JP)
YANASE NORIO (JP)
NATE NOBUYUKI (JP)
YANASE NORIO (JP)
NATE NOBUYUKI (JP)
Application Number:
PCT/JP2003/001149
Publication Date:
August 21, 2003
Filing Date:
February 05, 2003
Export Citation:
Assignee:
KONISHI CHEM IND (JP)
OI FUMIO (JP)
YANASE NORIO (JP)
NATE NOBUYUKI (JP)
OI FUMIO (JP)
YANASE NORIO (JP)
NATE NOBUYUKI (JP)
International Classes:
C07C315/00; C07C317/22; (IPC1-7): C07C315/00; C07C317/22
Foreign References:
| JPH1025277A | 1998-01-27 | |||
| EP0755920A1 | 1997-01-29 |
Attorney, Agent or Firm:
Saegusa, Eiji (1-7-1 Doshomachi, Chuo-k, Osaka-shi Osaka, JP)
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