CATION EXCHANGE MEMBRANE FOR ELECTROLYSIS OF AQUEOUS SOLUTION OF ALKALI METAL SALT

PURPOSE:To provide a titled cation exchange membrane which yields a high concn. of alkali metal oxides with high current efficiency by disposing a water permeable diaphragm having a regulated range of the rate of water permeability on one surface of a fluorine-contg. cation exchange membrane. CONSTI...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAHARA AKIHIKO, MATSUURA SHIYUNJI, SADA TOSHIKATSU, KURAMOTO NOBUYUKI, ODA TERUAKI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G APPARATUS THEREFOR CHEMISTRY COMPOSITIONS BASED THEREON ELECTROLYTIC OR ELECTROPHORETIC PROCESSES ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To provide a titled cation exchange membrane which yields a high concn. of alkali metal oxides with high current efficiency by disposing a water permeable diaphragm having a regulated range of the rate of water permeability on one surface of a fluorine-contg. cation exchange membrane. CONSTITUTION:A diaphragm (A) having water permeability of 10-10cc/hr. cm .cmH2O, more particularly 10-5cc/hr.cm .cmH2O, is adhered tightly on one surface of a fluorine-contg. cation exchange membrane (B), whereby an intended cation exchange membrane for electrolysis of aq. solns. of alkali metal salts is obtained. The cation exchange membranes (B) of sulfonic acid type of various different ion exchange capacities produced by hydrolyzing the polymer film obtd. from a copolymer of, for example, tetrafluoroethylene and perfluoro (3, 6-dioxa-4-methyl-7-octenesulfonyl fluoride) are used for said cation exchange membrane. Porous neutral membranes or cation exchange membranes having the above-described rate of water permeability, 15OMEGA-cm electric resistance in 6.0N- NaOH at 25 deg.C and uniform pore size distributions with 10-9mu average hole size are preferable for the diaphragm (A).