Method for preparing diaphragm for use in chlor-alkali cells

Details Method for preparing diaphragm for use in chlor-alkali cells Method for preparing diaphragm for use in chlor-alkali cells

C - Chemistry, Metallurgy

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B

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C25B 13/08 (2006.01) D06M 11/13 (2006.01) D06M 11/46 (2006.01) D06M 11/79 (2006.01) D06M 13/17 (2006.01) D06M 13/256 (2006.01) D06M 13/262 (2006.01) D06M 13/295 (2006.01) D06M 13/342 (2006.01) D06M 15/53 (2006.01)

Patent

CA 2223858

Asbestos-free diaphragms for chlor-alkali electrolytic cells are prepared by establishing a liquid permeable diaphragm base mat of fibrous synthetic polymeric material on the cathode structure, providing a coating of inorganic particulate material on the base mat, and treating the coated base mat with a nonionic or anionic surfactant. Preferably, the base mat is coated with the inorganic particulate material using a slurry of the inorganic particulate material suspended in an alkali metal halide brine solution containing the surfactant.

On prépare des membranes sans amiante pour cellules électrolytiques chlore-alcali en plaçant un mat de base de membrane perméable aux liquides constitué de matériau polymère synthétique fibreux sur la cathode, en appliquant un revêtement de matériau particulaire inorganique sur le mat de base, et en traitant le mat de base revêtu à l'aide d'un tensioactif non ionique ou anionique. De préférence, le mat de base est revêtu du matériau particulaire inorganique au moyen d'une suspension épaisse de matériau particulaire inorganique dans une solution salée d'halogénure métallique alcaline contenant le tensioactif.

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