Porous diaphragms

Details Porous diaphragms Porous diaphragms

H - Electricity

01

J

18/19, 204/81

H01J 31/36 (2006.01) C25B 13/08 (2006.01)

Patent

CA 1076990

ABSTRACT OF THE DISCLOSURE A process for the manufacture of porous diaphragms of synthetic material, especially polytetrafluoroethylene, which comprises forming a sheet of the synthetic material in admixture with a solid particulate water-insoluble additive (e.g. starch) to be removed therefrom, introducing said sheet into an electrolytic cell and removing the solid particulate water-insoluble additive from the sheet in situ in the cell. Suitable methods of removing the solid particulate water- insoluble additive from the sheet include filling the cell with the working electrolyte and electrolysing, or treating the sheet with an acid (e.g. hydrochloric acid) containing a corrosion inhibitor. The porous diaphragms are especially suitable for use in diaphragm cells for the production of chlorine from sodium chloride brine.

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