Chemistry: electrical and wave energy – Processes and products
Patent
1991-05-24
1992-03-24
Niebling, John
Chemistry: electrical and wave energy
Processes and products
204104, 204129, 2041824, C25B 114
Patent
active
050985329
ABSTRACT:
A process for producing sodium hydroxide and ammonium sulfate by electrolysing an aqueous solution of sodium sulfate is disclosed. The process is carried out in a three-compartment electrolytic cell having a central compartment separated from an anode and a cathode compartment by, respectively, anion selective and cation selective ion exchange membrane. The solution of sodium sulfate is circulated through the central compartment, while solutions of sodium hydroxide and ammonium sulfate are circulated, respectively, through the cathode and the anode compartment. During the process, ammonia is added to the anolyte to at least partially neutralize sulfuric acid produced in the anode compartment and reduce the back migration of protons from the anolyte into the central compartment. As a result, high purity ammonium sulfate of commercial value higher than that of sulfuric acid is produced with high current efficiency and in concentrations higher than those achievable for sulfuric acid.
REFERENCES:
patent: 3907654 (1975-09-01), Radd et al.
patent: 4561945 (1985-12-01), Coker et al.
patent: 4613416 (1986-09-01), Kau et al.
patent: 4707234 (1987-11-01), Mori et al.
Genders David
Thompson Jack S.
Niebling John
Ormiston Mining and Smelting Co. Ltd.
Ryser David G.
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