Title:
PRODUCTION OF DIHYDROXYDIPHENYL SOLUFONE
Document Type and Number:
Japanese Patent JP3890387
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method capable of industrially advantageously producing both high-purity 2,4'-dihydroxydiphenyl sulfone and 4,4'dihydroxydipheyl sulfone.
SOLUTION: In producing a dihydroxydiphenyl sulfone by reacting a sulfonating agent with phenol by dehydration, 1mol of the sulfonating agent is reacted with 2.0-4.0mol of phenol in odichlorobenzene solvent in an amount of 2.0-6.5 times as much as the theoretical yield of the dihydroxydiphenyl sulfone. When the reaction is completed, the ratio of unreacted phenol to the total amount of the unreacted phenol and o-dichlorobenzene in the reaction solution is regulated to 2-20wt.%. Further, the total amount of the unreacted phenol and o- dichlorobenzene is regulated to 2.0-7.0 times as much as the theoretical yield of the dihydroxydiphenyl sulfone. 4,4'-Dihydroxydiphenyl sulfone is precipitated and separated from the reaction solution at 80-160°C and then 2,4'- dihydroxydiphenyl sulfone is isolated from the filtrate.
Inventors:
Eiji Ogata
Norio Yanase
Master Nobuyuki
Norio Yanase
Master Nobuyuki
Application Number:
JP18310896A
Publication Date:
March 07, 2007
Filing Date:
July 12, 1996
Export Citation:
Assignee:
Konishi Chemical Industry Co., Ltd.
International Classes:
C07C315/00; C07C317/22; C07C315/06; (IPC1-7): C07C317/22; C07C315/00; C07C315/06
Domestic Patent References:
| JP6107623A | ||||
| JP6107622A | ||||
| JP1050855A | ||||
| JP61036253A | ||||
| JP61050958A | ||||
| JP9040635A | ||||
| JP61243059A |
Attorney, Agent or Firm:
Eiji Saegusa
Kakehi Yuro
Takeshi Ohara
Hiroji Nakagawa
Yasumitsu Tate
Kakehi Yuro
Takeshi Ohara
Hiroji Nakagawa
Yasumitsu Tate