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Monopolar electrolytic diaphragm cells with removable and replaceable dimensionally stable anodes and method of inserting and removing said anodes
| Details |
Inventors: De Nora, Oronzio; Bianchi, Giuseppe; Meneghini, Giovanni;
Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A. (Milan, IT)
Primary Examiner: Mack; John H.
Assistant Examiner: Valentine; D. R.
Attorney, Agent or Firm: Hammond & Littell
Describes a monopolar diaphragm electrolytic cell with dimensionally stable anodes in which the anodes rest freely in the cell and are spring-pressed toward the diaphragms by spring-loaded transverse arms on the positive current carriers, which in use contact, but are not mechanically connected to, the anodes, the spring-pressed electrical contacts between the transverse arms and the anodes are sufficient to carry current to the anodes without substantial ohmic drop through these contacts and permit the anodes to be removed from the cells for recoating and other purposes without destroying any welds or other permanent mechanical connections between the anodes and other portions of the cell. |
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DETAILED DESCRIPTION We claim: 1.
In a monopolar electrolytic cell, a conductive bottom, a cell can, containing spaced, hollow, tubular, diaphragm-covered cathodes, on said cell bottom, a cell top, positive current connections to said bottom, negative current connections to said cell can, spaced current conductors electrically connected to and extending upward from said cell bottom between said cathodes, flexible current-carrying arms on said current-carrying conductors, flat valve metal anodes resting loosely on said cell bottom between said current conductors and said cathodes, spring-held contacts between said flat valve metal anodes and said flexible current-carrying arms whereby current connection can be made and broken between said anodes and said current-carrying arms, and an electrically conducting electrocatalytic coating on said anodes.
2.
The cell of claim 1 in which the valve metal anodes are an expanded mesh construction.
3.
The cell of claim 1 in which the valve metal anodes are coated with an electrically conducting electrocatalytic coating containing an oxide of a platinum group metal and an oxide of a valve metal.
4.
Monopolar electrolytic cell with diaphragm, comprising a bottom, connected to the positive pole of the electric source, to which the anodes of the cell are electrically connected, and a cathodic box, connected to the negative pole of the electric source, to which the cathodes of the cell are connected and which is formed by hollow, tubular, porous structures equidistant from and parallel to each other and covered by diaphragms, characterized in that current carriers extend vertically from the bottom of said cell between the hollow, tubular, porous cathode structures, flexible transverse arms provided with contacts to distribute the electric current are secured on said current carriers, the anodes, of substantially flat, reticulated valve metal, are inserted in the space between said transverse arms and the diaphragm-covered cathode surfaces of the adjacent cathodes, the lower edges of the anodes rest on the bottom of the cell and are held in position against insulating spacers on the diaphragm-covered adjacent cathode surfaces by the force exerted by said contacts on the back of said anodes as a result of the spreading of said flexible transverse arms by elastic effect or through the insertion of spreaders
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Fuel Cells 
