Provided herein a process for purification of an ionic liquid from heavy metals, comprising combining heavy metal-containing ionic liquid and a sulfide source to form heavy metal sulfide, and separating said heavy metal sulfide from the ionic liquid.

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 NCtA an halide anion displaceable by NO3-, or both, ...

Disclosed herein bi-phasic compositions of water-immiscible ionic liquid and aqueous phase for application as versatile scrubbing liquid suitable for decontamination of a contaminated gaseous stream from a variety of contaminants. It is currently believed that halogen-assisted catalytic-like oxidation of the contami...