Coating metal anodes to decrease consumption rates
AssigneeHooker Chemicals & Plastics Corporation
InventorsEdward H. Cook, Jr., Gerald R. Marks
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Abstract
An improved anode structure for a chlor-alkali type diaphragm cell wherein the anode is a porous, valve metal, e.g., titanium, anode having on one side a coating of a noble metal or noble metal oxide and on the uncoated side a membrane composed essentially of a cation-active permselective material which is substantially impervious to liquids and gases. The membrane covered surface is disposed spaced from but facing the cathode member. Anodes of this improved structure give minimum cell voltage and a surprisingly reduced consumption rate of the noble metal or oxide coating.
Claims17
An electrolysis cell comprising a housing, having, in substantially vertical configuration, an anode compartment containing a porous valve metal anode, a cathode compartment containing a cathode and a cation-active permselective membrane which is substantially impervious to liquids and gases separating said anode and said cathode, said membrane being emplaced on the surface of said anode which faces the cathode, spaced apart from said cathode, said anode having a coating of a noble metal, or alloy or oxide thereof on the back face of the anode, the front face thereof not being so coated.
A chlor-alkali type diaphragm cell comprising a housing, a cation-active permselective membrane which is substantially impervious to liquids and gases disposed within said housing so as to divide said housing into a first and a second substantially vertical compartments, a cathode disposed in said first compartment spaced apart from said membrane, a porous valve metal anode having a front face and a rear face disposed in said second compartment such that said first face is in contact with said membrane, and a coating of a noble metal or alloy or oxide thereof on said rear face of said anode only.
Dependencies are inferred from the claim text.