Patent ID: 7459134

Claim:
A method of treating a combustion fume comprising nitrogen and at least one of the acid compounds as follows: carbon oxides, nitrogen oxides and sulfur oxides, wherein the following stages are carried out: a) contacting the fume with a solvent capturing the acid compounds so as to obtain, on the one hand, a solvent-comprising purified fume and, on the other hand, a solvent laden with acid compounds, and b) contacting the solvent-comprising purified fume obtained in stage a) with a non-aqueous ionic liquid so as to obtain a solvent-depleted purified fume and a solvent-laden ionic liquid, the ionic liquid having as general formula Q + A − ; Q + designating an ammonium, phosphonium and/or sulfonium cation, and A − an anion likely to form a liquid salt.