Process and apparatus for the production of sulphuric acid...

C - Chemistry – Metallurgy – 25 – B

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C25B 1/46 (2006.01) C25B 1/16 (2006.01) C25B 1/22 (2006.01)

Patent

CA 2085424

The present invention relates to an electrochemical process for the production of sulphuric acid and alkali metal hydroxide, from an aqueous anolyte containing alkali metal sulphate. According to the invention, crystalline alkali metal sulphate is added to the anolyte, whereby the concentration of water can be maintained below about 55 percent by weight. In the electrolysis, the anolyte is brought to an electrochemical cell with a cation exchange membrane. In the cell, sulphuric acid and oxygen are formed in the anode compartment and alkali metal hydroxide and hydrogen in the cathode compartment. The steps normally preceding the electrolysis, i.e. dissolution and purification of the sulphate can be disposed of, since the process is less sensitive to impurities than the processes of the prior art. The present invention also relates to an apparatus for the production of sulphuric acid and alkali metal hydroxide according to the invention.

La présente invention porte sur un procédé électrochimique pour la production d'acide sulfurique et d'un hydroxyde de métal alcalin à partir d'un anolyte aqueux renfermant un sulfate de métal alcalin. Selon l'invention, on ajoute du sulfate de métal alcalin à l'anolyte, ce qui permet de maintenir la concentration d'eau en dessous d'environ 55 % en poids. Lors de l'électrolyse, l'anolyte est introduit dans une cellule électrochimique, munie d'une membrane d'échange cationique. Dans la cellule, l'acide sulfurique et l'oxygène se forment dans le compartiment de l'anode, alors que l'hydroxyde de métal alcalin et l'hydrogène sont produits dans le compartiment de la cathode. Les étapes qui normalement précèdent l'électrolyse, soit la dissolution et la purification du sulfate, peuvent être éliminées, vu que le procédé est moins sensible aux impuretés que les procédés antérieurs. La présente invention porte également sur un appareil pour la production d'acide sulfurique et d'hydroxyde de métal alcalin utilisant le procédé de l'invention.

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