Preparation of alkali metal nitrates

C - Chemistry – Metallurgy – 25 – B

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C25B 1/14 (2006.01)

Patent

CA 1335975

Alkali metal nitrates are prepared by supplying the anode space of an electrolysis cell, separated from the cathode space by a perm-selective cation exchange membrane, with alkali metal chloride solu- tion and at the same time supplying the cathode space with a nitric acid/alkali metal nitrate solution whose alkali metal nitrate concentration is not less than 10% by weight and whose HNO3 concentration is of from 0.1 to 10% by weight, and withdrawing from the cathode space a solution whose pH does not exceed 5.

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