Ronald L Dotson

US Patent:

40564487, Nov 1, 1977

Filed:

Dec 17, 1976

Appl. No.:

5/751644

Inventors:

Andrew D. Babinsky - Chagrin Falls OH
Ronald L. Dotson - Cleveland TN

Assignee:

Diamond Shamrock Corporation - Cleveland OH

International Classification:

C25B 116
C25B 100

US Classification:

204 98

Abstract:

Optimum current efficiencies are attained and maintained in a membrane chlor-alkali electrolytic cell by the constant, precise control of both the brine and caustic concentrations at each membrane phase boundary. Such control requires recycling through external holding tanks wherein the concentrations are adjusted to 560 grams per liter caustic and 190 grams per liter brine. Turbulent flow of such concentrations in the cells helps maintain the optimum concentration and also decreases the diffusion layer.

US Patent:

41927257, Mar 11, 1980

Filed:

Feb 16, 1977

Appl. No.:

5/769100

Inventors:

Ronald L. Dotson - Mentor OH
Kevin J. O'Leary - Cleveland Heights OH

Assignee:

Diamond Shamrock Corporation - Dallas TX

International Classification:

C25B 116
C25B 126

US Classification:

204 98

Abstract:

Concentrated alkali metal hydroxide substantially free of alkali metal halide and other impurities is produced by the electrolysis of an alkali metal halide solution in an electrolytic cell having a dimensionally stable anode and a metal cathode separated by an electrically conductive stable selectively permeable hydrated cation ion-exchange membrane film of a fluorinated copolymer having pendant sulfonic acid groups or derivatives of such groups. The membrane film is capable of use at high temperatures and under severely corrosive chemical conditions for extended periods without degradation.

US Patent:

40254054, May 24, 1977

Filed:

Oct 21, 1971

Appl. No.:

5/191424

Inventors:

Ronald L. Dotson - Mentor OH
Kevin J. O'Leary - Cleveland Heights OH

Assignee:

Diamond Shamrock Corporation - Cleveland OH

International Classification:

C25B 116
C25B 126
C25B 1308

US Classification:

204 98

Abstract:

Concentrated alkali metal hydroxide substantially free of alkali metal halide and other impurities is produced by the electrolysis of an alkali metal halide solution in an electrolytic cell having a dimensionally stable anode and a metal cathode separated by an electrically conductive stable selectively permeable hydrated cation ion-exchange membrane film of a fluorinated copolymer having pendant sulfonic acid groups or derivatives of such groups. The membrane film is capable of use at high temperatures and under severely corrosive chemical conditions for extended periods without degradation.

US Patent:

42971942, Oct 27, 1981

Filed:

Feb 16, 1977

Appl. No.:

5/769098

Inventors:

Ronald L. Dotson - Mentor OH
Kevin J. O'Leary - Cleveland Heights OH

Assignee:

Diamond Shamrock Corporation - Dallas TX

International Classification:

C25B 900

US Classification:

204257

Abstract:

Concentrated alkali metal hydroxide substantially free of alkali metal halide and other impurities is produced by the electrolysis of an alkali metal halide solution in an electrolytic cell having a dimensionally stable anode and a metal cathode separated by an electrically conductive stable selectively permeable hydrated cation ion-exchange membrane film of a fluorinated copolymer having pendant sulfonic acid groups or derivatives of such groups. The membrane film is capable of use at high temperatures and under severely corrosive chemical conditions for extended periods without degradation.