PROCESS FOR PRODUCING 4,4'−BISPHENOL SULFONE

Title:

PROCESS FOR PRODUCING 4,4'−BISPHENOL SULFONE

Document Type and Number:

WIPO Patent Application WO/2003/078388

Kind Code:

A1

Abstract:

A process for producing 4,4'−bisphenol sulfone by reacting phenol with sulfuric acid, which comprises conducting the dehydration reaction in a mixed solvent comprising mesitylene and an aliphatic saturated hydrocarbon having a boiling point of 175°C or higher and finally distilling off the mesitylene from the reaction system, or comprises conducting the reaction in a solvent comprising an aliphatic saturated hydrocarbon in a reaction vessel equipped with a fractionating device. Thus, 4,4'−bisphenol sulfone can be produced in high yield with a higher operating efficiency. Also provided is a process for easily producing 4,4'−bisphenol sulfone having a high purity which comprises conducting the reaction in a solvent containing an aliphatic saturated hydrocarbon, subsequently adding a C₁₋₃ alcohol to the reaction mixture, separating the alcohol layer from the resultant mixture, and recrystallizing the 4,4'−bisphenol sulfone from the alcohol layer.

Inventors:

HIDAKA TOMOYA (JP)

Application Number:

PCT/JP2002/002702

Publication Date:

September 25, 2003

Filing Date:

March 20, 2002

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON SODA CO (JP)
HIDAKA TOMOYA (JP)

International Classes:

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

Foreign References:

JP2002088055A	2002-03-27
JP2002088053A	2002-03-27
JP2002145851A	2002-05-22
EP0293037A1	1988-11-30
US4996367A	1991-02-26
JPS50106937A	1975-08-22
JPS6124559A	1986-02-03
US4933494A	1990-06-12
EP0495097A1	1992-07-22

Other References: