Asbestos-free diaphragm, comprising non-fibrous mineral...

C - Chemistry – Metallurgy – 25 – B

Patent

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C25B 13/04 (2006.01)

Patent

CA 2396047

The invention concerns a microporous diaphragm obtainable by filtering through a porous support, an aqueous dispersion free of asbestos fibres and titanate fibres, comprising organic fibres, at least a binding agent selected among halogenated polymers, at least a pore-forming agent and mineral particles with non-fibrous structure. The invention also concerns a combination comprising said diaphragm and a fibrous mat obtainable by filtration deposit through a porous support of a dispersion comprising fibres whereof part is electrically conductive, at least a binding agent selected among halogenated polymers, at least an electrolytic agent, at least a pore-forming agent. The invention further concerns the preparation of the diaphragm and the combination, and the use thereof to obtain an alkali metal hydroxide solution by electrolysis of aqueous alkali metal halide solutions.

La présente invention a pour objet un diaphragme microporeux susceptible d'être obtenu par filtration au travers d'un support poreux, d'une dispersion aqueuse dépourvue de fibres d'amiante et de fibres de titanate, comprenant des fibres organiques, au moins un liant choisi parmi les polymères halogénés, au moins un agent porogène et des particules minérales de structure non fibreuse. Elle a de même pour objet une association comprenant ledit diaphragme et une nappe fibreuse susceptible d'être obtenue par dépôt par filtration à travers un support poreux d'une dispersion comprenant des fibres dont une partie est conductrice de l'électricité, au moins un liant choisi parmi les polymères halogénés, au moins un agent électrocatalytique, au moins un agent porogène. Elle concerne de plus la préparation du diaphragme et de l'association, ainsi que l'utilisation de ces derniers pour l'obtention de solution d'hydroxyde de métal alcalin par électrolyse de solutions aqueuses d'halogénure de métal alcalin.

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