FLUORINE−CONTAINING CATION−EXCHANGE MEMBRANE AND ELECTROYTIC SODA PROCESS

Title:

FLUORINE−CONTAINING CATION−EXCHANGE MEMBRANE AND ELECTROYTIC SODA PROCESS

Document Type and Number:

WIPO Patent Application WO/2002/103083

Kind Code:

A1

Abstract:

A cation−exchang membrane comprising at least two layers, a first layer consisting of a fluorine−containing polymer having a sulfonic acid group, and a second layer consisting of a fluorine−containing polymer having a carboxylic acid group on the cathode side thereof, wherein, when conducting an electrolytic soda process using the cation−exchange membrane as a diaphragm between an anode chamber and a cathode chamber, a water permeation amount through the cation−exchange membrane is at least 4.8 mol&sol F (F: Faraday) under operating conditions that a brine concentration in the anode chamber is 200 g&sol L, sodium hydroxide concentration in the cathode chamber 32 mass%, current density 5 kA&sol m², and temperature 90°C. The electrolysis−use fluorine−containing cation−excahnge membrane gives an excellent effect of keeping a uniform catholyte concentration even when installed in an electrolytic bath without any special circulating means.

Inventors:

NISHIO TAKUO (JP)
SAITO YOSHIHIKO (JP)
SHIMOHIRA TETSUJI (JP)

Application Number:

PCT/JP2002/005973

Publication Date:

December 27, 2002

Filing Date:

June 14, 2002

Export Citation:

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Assignee:

ASAHI GLASS CO LTD (JP)
NISHIO TAKUO (JP)
SAITO YOSHIHIKO (JP)
SHIMOHIRA TETSUJI (JP)

International Classes:

C08J5/22; C25B1/46; (IPC1-7): C25B13/08; C25B9/00; C25B1/16; C08L27/12; C08J5/22

Foreign References:

JP2000001794A	2000-01-07
JPH06330369A	1994-11-29
EP0045603A1	1982-02-10
JPH05125579A	1993-05-21

Other References: