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Diaphragm for electrolytic cell

  • US 8,460,536 B2
  • Filed: 01/19/2006
  • Issued: 06/11/2013
  • Est. Priority Date: 01/19/2006
  • Status: Active Grant
First Claim
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1. A liquid-permeable diaphragm for use in a chlor-alkali electrolytic cell comprising:

  • (a) a liquid-permeable base mat, said base mat comprising synthetic polymeric material that is at least partially resistant to the environment within said electrolytic cell, and(b) a coating of water-insoluble particulate material on said base mat, the water-insoluble particulate material having been deposited on said base mat from an aqueous slurry of water and particulate material consisting essentially of;

    (i) at least one oxide, boride, carbide, nitride or silicate of a valve metal,(ii) clay mineral,(iii) hydrous metal oxide chosen from the hydrous oxides of magnesium, the hydrous oxides of zirconium, and mixtures of said hydrous metal oxides, and(iv) from 0.01 to 2 weight percent of alkali metal polyphosphate.

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