Porous diaphragms
AssigneeImperial Chemical Industries PLC
InventorDavid Stephen Riley
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Abstract
A process for the manufacture of a porous diaphragm of a synthetic material, especially polytetrafluoroethylene, which comprises forming a sheet of the synthetic material in admixture with a solid particulate additive (eg starch) to be removed therefrom, introducing said sheet into an electrolytic cell, filling the cell with the working electrolyte and removing the solid particulate in situ in the cell by electrolysing the said electrolyte. The porous diaphragms are especially suitable for use in diaphragm cells for the production of chlorine wherein the working electrolyte is sodium chloride brine.
Claims31
A process for the manufacture of a porous diaphragm of a synthetic material for use in an electrolytic cell which comprises forming a sheet of the synthetic organic polymeric material selected from the group consisting essentially of polytetrafluoroethylene and polyvinylidene fluoride in admixture with a solid particulate additive to be removed therefrom, assembling said sheet into an electrolytic cell, filling the cell with the working electrolyte and removing solid particulate additive from the sheet in situ in the cell by electrolysing the said electrolyte, said additive being insoluble in said electrolyte.
Dependencies are inferred from the claim text.