PROCESS FOR PRODUCING PERFLUOROBUTANESULFONIC ACID SALT

Title:

PROCESS FOR PRODUCING PERFLUOROBUTANESULFONIC ACID SALT

Document Type and Number:

WIPO Patent Application WO/2011/093371

Kind Code:

A1

Abstract:

A process for producing a perfluorobutanesulfonic acid salt (PFBS salt) is provided with which it is possible to attain an improvement in yield and a reduction in PFOS salt content. Electrolytic fluorination is conducted in an electrolytic solution comprising anhydrous hydrogen fluoride to yield perfluorobutanesulfonyl fluoride, and the fluoride is hydrolyzed to yield a perfluorobutanesulfonic acid salt. The process for producing a perfluorobutanesulfonic acid salt includes: a step in which liquid-phase components generated in the reaction tank are withdrawn and a first perfluorobutanesulfonic acid salt fraction is prepared therefrom; and a step in which gas-phase components discharged from the reaction tank are collected and a second perfluorobutanesulfonic acid salt fraction is prepared therefrom. The electrolytic solution in the reaction tank is regulated so as to have a perfluorooctanesulfonyl fluoride content of 500 ppm or lower by withdrawing the liquid-phase components from the reaction tank.

Inventors:

UOTANI MASAKAZU (JP)
KAMIYA TAKESHI (JP)
HONDA TSUNETOSHI (JP)

Application Number:

PCT/JP2011/051581

Publication Date:

August 04, 2011

Filing Date:

January 27, 2011

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)
MITSUBISHI MAT ELECT CHEM CO (JP)
UOTANI MASAKAZU (JP)
KAMIYA TAKESHI (JP)
HONDA TSUNETOSHI (JP)

International Classes:

C25B3/28; C07C303/22; C07C309/06

Foreign References:

JPS5770283A	1982-04-30
JPH0649674A	1994-02-22
JP2009179836A	2009-08-13
JP2007119458A	2007-05-17
US2732398A	1956-01-24
JP2009179836A	2009-08-13
JP2002038288A	2002-02-06
JPH0649674A	1994-02-22

Other References: