| 摘要 |
Sodium chloride soln. is electrolyzed in an electrolytic cell using a cation exchange membrane which is a fluorocarbon polymer containing sulfonic acid groups and at least one cation exchange group which is less acidic than the sulfonic acid group with higher proportion of the latter in surface stratum on the cathode slide of the membrane than in the anode membrane, while controlling proton concn. in the anolyte at not higher than critical proton conc. at which no substantial amount of protons in the anolyte penetrate into the membrane.
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