Claims
- 1. In a process for electrolyzing brine in chlor-alkali diaphragm cells employing graphite anodes, the improvement comprising operating at a low anolyte pH of less than 1.5 thereby extending the operating life of the graphite anodes, said operation at a low ph of less than 1.5 being made operationally feasible by employing as the diaphragm material a vacuum-drawn polymeric fluorocarbon-bonded mixture of crocidolite/chrysotile asbestos fibers, said crocidolite/chrysotile being in a weight ratio range of about 33/67 to about 80/20.
- 2. The process of claim 1 wherein the ratio of crocidolite/chrysotile asbestos is in the range of about 40/60 to about 75/25.
- 3. The process of claim 1 wherein the ratio of crocidolite/chrysotile asbestos is about 50/50.
- 4. The process of claim 1 wherein the amount of polymeric fluorocarbon in the bonded asbestos diaphragm is in the range of about 5 parts to 100 parts per hundred parts of asbestos.
- 5. The process of claim 1 wherein the amount of polymeric fluorocarbon in the bonded asbestos diaphragm is in the range of about 10 to about 50 parts per hundred parts of asbestos.
- 6. The process of claim 1 wherein the amount of polymeric fluorocarbon in the bonded asbestos diaphragm is in the range of about 15 to about 40 parts per hundred parts of asbestos.
- 7. The process of claim 1 wherein the pH is in the range of about 0.5 to about 1.5.
CROSS-REFERENCE TO COPENDING APPLICATION
This application is a continuation-in-part of copending application Ser. No. 640,119 filed Dec. 12, 1975, now U.S. Pat. No. 4,093,533.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3505200 |
Grotheer |
Apr 1970 |
|
3723264 |
Leduc et al. |
Mar 1973 |
|
3853720 |
Korach et al. |
Oct 1974 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
640119 |
Dec 1975 |
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