PROCESS FOR PRODUCING DIPHENYL SULFONE COMPOUND

Title:

PROCESS FOR PRODUCING DIPHENYL SULFONE COMPOUND

Document Type and Number:

WIPO Patent Application WO/2002/057221

Kind Code:

A1

Abstract:

A process by which a high-purity 4,4'-dihydroxydiphenyl sulfone monoether can be industrially advantageously obtained. The process, which is for producing a compound represented by the formula (I) (I) (wherein R?1¿ and R?2¿ each independently represents halogeno, C¿1-8? alkyl, or C¿2-8? alkenyl; m and n each independently is an integer of 0 to 4; and R?3¿ represents C¿1-8? alkyl, C¿2-8? alkenyl, C¿3-8? cycloalkyl, or optionally substituted aralkyl), comprises (1) conducting pH adjustment two or more times in a purification step, (2) removing the alkyl halide used in excess, (3) using a solvent, e.g., water, having an iron content of 0.05 ppm or lower, (4) using a vessel coated inside with a corrosion-resistant layer, (6) adding a chelating agent, and (7) using a means for drying with mechanical stirring.

Inventors:

KATSUURA KIYOSHI (JP)
HIDAKA TOMOYA (JP)
TAKASHINA YUTAKA (JP)
OHNUKI YASUO (JP)

Application Number:

PCT/JP2002/000410

Publication Date:

July 25, 2002

Filing Date:

January 22, 2002

Export Citation:

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Assignee:

NIPPON SODA CO (JP)
IBARAKIKASEI CHEMICALS CO LTD (JP)
KATSUURA KIYOSHI (JP)
HIDAKA TOMOYA (JP)
TAKASHINA YUTAKA (JP)
OHNUKI YASUO (JP)

International Classes:

C07C315/06; C07C317/22; (IPC1-7): C07C315/04; C07C317/22

Domestic Patent References:

WO1991011433A1

1991-08-08

Foreign References:

JPH03258760A	1991-11-19
JPS6056949A	1985-04-02
JP2001011001A	2001-01-16
US5414149A	1995-05-09
JPH11124362A	1999-05-11

Other References: