Method of preparing an asbestos diaphragm

Details Method of preparing an asbestos diaphragm Method of preparing an asbestos diaphragm

1987-04-06

1989-09-26

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204128, 204252, 204283, 204295, 162153, 1621572, 1621576, 162158, 1621577, C25B 116, C25B 126

Patent

active

048697931

ABSTRACT:
An electrolyte permeable diaphragm consisting essentially of asbestos is prepared by depositing asbestos and a porosity control agent selected from the group of cellulosic-type materials, e.g., starch, cellulose or rayon, infusible thermoset polymer materials, e.g., phenol-formaldehyde resin, urea-formaldehyde resin or melamine-formaldehyde resin, and inorganic materials, e.g., fiberglass, graphite, titania, silica, talc, vermiculite or potassium-containing mica from an aqueous slurry including alkali metal hydroxide onto a porous substrate, the porosity control agent being substantially stable and insoluble in the aqueous alkali metal hydroxide-containing slurry, followed by heating the deposited asbestos, porosity control agent and alkali metal hydroxide at temperatures between about 110.degree. C. and 280.degree. C. for a period of time sufficient to react the asbestos and alkali metal hydroxide whereby the porosity control agent provides the permeability for the diaphragm.

REFERENCES:
patent: 3991251 (1976-11-01), Foster et al.
patent: 4204938 (1980-05-01), Bachot et al.

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