Method for making a cathode, and method for lowering hydrogen overvoltage in a chlor-alkali cell

Patent 4337127 Issued on June 29, 1982. Estimated Expiration Date:

May 26, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2642654

2878140

2913385

3406105

3637437

Method of electrolysis
Patent #: 4105516
Issued on: 08/08/1978
Inventor: Martinsons , et al.

Catalytically active porous nickel electrodes
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Issued on: 09/26/1978
Inventor: Needes

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Issued on: 07/10/1979
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Cell having in situ reduction of electrode overvoltage Patent #: 4292159
Issued on: 09/29/1981
Inventor: Kuo , et al.

Inventor

Copeland, Terry M.

Assignee

E. I. Du Pont de Nemours and Company

Application

No. 06/267081 filed on 05/26/1981

US Classes:

205/350, Treating electrode, diaphram, or membrane during synthesis (e.g., corrosion prevention, etc.)204/291, Composition205/526, Utilizing specified electrode (e.g., rod, cylinder, etc.)205/536Treating electrolyte or bath material prior to synthesis other than heating, cooling, or replacing consumed material during synthesis

Examiners

Primary: Andrews, R. L.

International Classes

C25B 1/00 (20060101)
C25B 11/00 (20060101)
C25B 11/04 (20060101)
C25B 1/46 (20060101)

Abstract

The invention comprises an improved cathode for a chloralkali cell having grains of alpha-iron adherent to the surface of the cathode, and a process for making the cathode which comprises depositing grains of alpha-iron onto the surface of an electrically conductive cathode substrate in an electrical cell. The invention also provides a method for lowering the operating voltage of a chloralkali electrolysis cell which comprises adding iron particles to the cathode compartment of the cell.