Terry Doris Copeland

US Patent:

42984475, Nov 3, 1981

Filed:

Mar 7, 1980

Appl. No.:

6/128111

Inventors:

Terry M. Copeland - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C25B 1104

US Classification:

204252

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.

US Patent:

43606016, Nov 23, 1982

Filed:

Dec 10, 1980

Appl. No.:

6/214997

Inventors:

Terry M. Copeland - Wilmington DE
Paul R. Resnick - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

B01J 3900
C08F 600

US Classification:

521 27

Abstract:

A process for extracting a fluorinated polymer which contains carboxylic ester functional groups with a liquid compound which is preferably a perchlorofluorocarbon having a boiling point in the range of 30. degree. to 125. degree. C. is described. Polymer so extracted can be fabricated into a membrane and hydrolyzed to ion exchange form to provide a membrane for electrolytic cells. When used as the membrane for a chloralkali cell, such membrane provides improved performance, e. g. , a high level of current efficiency and low power consumption are maintained for an extended period of time when compared against a membrane of like construction fabricated from polymer which has not been so extracted.

US Patent:

43371272, Jun 29, 1982

Filed:

May 26, 1981

Appl. No.:

6/267081

Inventors:

Terry M. Copeland - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C25B 134
C25B 1104

US Classification:

204 98

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.