Clairion Ltd.

Revital Mali

Zach Barnea

A process for recovering nitric acid or salts thereof, comprising: contacting, in the presence of water, an water-immiscible ionic liquid of the formula [A][X], wherein [A] represents a phosphonium or ammonium cation and [X] represents a counter anion which is NO, an halide anion displaceable by NO, or both, with a fluid which contains HNOand at least one more mineral acid, or precursors of said acids, and partition, under mixing, said acids between aqueous and organic phases and form nitrate-loaded ionic liquid of the formula [A][NO]where Z indicates a molar amount of nitrate held in the ionic liquid beyond the positions occupied by the nitrate counter ions; separating the so-formed mixture into an organic phase comprising a nitrate-loaded ionic liquid of the formula [A][NO]and an aqueous phase consisting of a nitrate-depleted aqueous solution that contains the other mineral acid(s); stripping the nitric acid from said nitrate-loaded ionic liquid to create an aqueous nitrate solution and regenerate ionic liquid of the formula [A][NO]with reduced nitrate loading, or unloaded [A][NO]ionic liquid.

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Mevaseret Zion, Israel

Revital Mali