C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 1/16 (2006.01) C25B 1/00 (2006.01) C25B 1/16 (2006.01)
Patent
CA 2048815
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.
Procédé pour l'obtention d'hydroxyde de sodium et de sulfate d'ammonium par electrolyse d'une solution aqueuse de sulfate de sodium. Le procédé est mis en oeuvre dans une cuve d'électrolyse à trois compartiments, possédant un compartiment central séparé d'un compartiment anodique et d'un compartiment cathodique respectivement par une membrane d'échange cationique et anionique. On fait circuler la solution de sulfate de sodium à travers le compartiment central, pendant que les solutions d'hydroxyde de sodium et de sulfate d'ammonium circulent respectivement à travers le compartiment de la cathode et celui de l'anode. Pendant le processus, on ajoute de l'ammoniac à l'anolyte pour neutraliser au moins partiellement l'acide sulfurique produit dans le compartiment de l'anode et réduire le retour de protons par migration de l'anolyte vers le compartiment central. On obtient ainsi un sulfate d'ammonium très pur, dont la valeur commerciale est supérieure à celle de l'acide sulfurique, grâce à un haut rendement en courant et à des concentrations plus fortes que celles pouvant être obtenues avec l'acide sulfurique.
Genders David
Thompson Jack S.
773006 Alberta Ltd.
Mcfadden Fincham
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