Purification of Concentrated Aqueous Hydroxide Solutions for Electrolysis
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Jan 23, 2025
app pub date -
Jan 11, 2024
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Jan 11, 2024
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Disclosed are novel processes, based on precipitation, settling, and filtration for the removal of critical impurities selected from dissolved transition metals, inorganic anions and dissolved organic compounds, from highly concentrated hydroxide solutions used as electrolytes in alkaline water electrolysis (AEW) to produce hydrogen. The processes comprise adding to the solutions at least one precipitation additive selected from water-soluble salts of alkaline earth metals; nickel (II) hydroxide; and hydroxides or oxides of alkaline earth metals, provided that the surface area of the hydroxides/oxides is more than 5 m2/g, to form at least one inorganic compound (or complex) as a precipitate which is removed from the solution.
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