Hooker Chemicals & Plastics Corporation

Oxytech Systems, Inc.

Occidental Chemical Corporation

Arthur C Schulz

Edward H Cook, Jr

Ursula I Keller

Robert Kiszewski

Tilak V Bommaraju

Christine A Lazarz

Krishnan Viswanathan

Herbert J Rosen

An improved diaphragm for an electrolytic cell is prepared by mixing a slurry of an additive, such as poly(ethylene chlorotrifluoroethylene), and asbestos fibers with a dispersion of titanium dioxide in isopropyl alcohol, depositing the treated asbestos fibers onto a cathode, heating the diaphragm to an elevated temperature of from about 100.degree. C. to about 400.degree. C., and allowing the diaphragm to cool. The diaphragm prepared according to this process exhibits improved mechanical strength and integrity as well as a decrease in electrical energy consumption in comparison to diaphragms prepared using conventional techniques.

Diaphragm for an electrolytic cell

An improved diaphragm for an electrolytic cell is prepared by mixing a slurry of asbestos fibers with a dispersion of titanium dioxide in isopropyl alcohol, depositing the treated asbestos fibers onto a cathode, heating the diaphragm to an elevated temperature of from about 100.degree. C. to about 300.degree. C., and allowing the diaphragm to cool. The diaphragm prepared according to this process exhibits improved mechanical strength and integrity as well as a decrease in electrical energy consumption in comparison to diaphragms prepared using conventional techniques.

A foraminous protective cathode for diaphragm-type electrolytic cells having a steel cathode and polymeric microporous separator reduces or eliminates separator plugging thereby increasing useful life-expectancy of the separator. The protective cathode positioned between the primary steel cathode and separator has an electroconductive metallic surface of nickel, cobalt, copper, chromium, noble metals, noble metal oxides or mixtures thereof.

Method of increasing useful life expectancy of microporous separators

The invention disclosed herein relates to a polymeric microporous electrolytic cell separators for producing alkali metal hydroxide at high current efficiencies, said separator having:

Polymeric microporous separators for use in electrolytic processes and

A process for the production of chlorine dioxide, chlorine and an inorganic salt comprising reacting an aqueous solution of a chlorate with hydrochloric acid under reduced pressure at a temperature near the boiling point of said solution, withdrawing produced chlorine dioxide, chlorine and water vapor from said solution, replenishing said solution with an additional amount of chlorate and acid, saturating said solution with a cation of said chlorate and an anion of said acid and crystallizing in said solution, a salt of the cation of the chlorate and the anion of the said acid.

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North Tonawanda, NY, United States of America

Arthur C Schulz