PRODUCTION OF COMPOSITE ION EXCHANGE MEMBRANE

• Main Authors: KAGIYAMA YASUHIRO, YAMAMOTO TAKAHISA, KANEDA JUNJI
• Format: Patent
• Language: English
• Published: 26.04.1988
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; 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; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING; WORKING-UP

PURPOSE:To obtain a membrane capable of producing highly concentrated acid and alkali by the double decomposition of a neutral salt, in high current efficiency, by carrying out the crosslinking treatment and the introduction of cation exchange group to a surface of a membrane produced by the polymerization of a specific monomer mixture and introducing anion exchange group to the other surface of the membrane. CONSTITUTION:A polymer membrane is produced by polymerizing a monomer mixture composed mainly of an aromatic monomer having a halogen-substituted alkyl group and a polymerizable vinyl group (e.g. chloromethylstyrene), a nitrile compound monomer having vinyl group (e.g. acrylonitrile) and a polyvalent vinyl compound monomer (e.g. divinylbenzene). A surface of the membrane is subjected to crosslinking treatment and the introduction of cation exchange group and the other surface is subjected to the introduction of anion exchange group. The amounts of the aromatic compound monomer, nitrile compound monomer and polyvalent vinyl compound monomer in the monomer mixture are >=60wt%, 5-20wt% and 1-10wt%, respectively. The fixed ion concentration of the cation exchange layer is 10-20N.