US 7,459,134 B2 · Method of decarbonating a combustion fume with extraction of the solvent contained in the purified fume

Abstract

The combustion fume flowing in through line 1 is decarbonated by contacting with a solvent in column C2. The solvent laden with carbon dioxide is regenerated in zone R. The purified fume discharged through line 9 comprises part of the solvent. The method allows to extract the solvent contained in the purified fume. The purified fume is contacted in zone ZA with a non-aqueous ionic liquid of general formula Q+ A−; Q+ designates an ammonium, phosphonium and/or sulfonium cation, and A− an anion likely to form a liquid salt. The solvent-depleted purified fume is discharged through line 17. The solvent-laden ionic liquid is regenerated by heating in evaporation device DE. The solvent separated from the ionic liquid in device DE is recycled.

Claims15

Dependent claims

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.

1 more element

Dependencies are inferred from the claim text.

Method of decarbonating a combustion fume with extraction of the solvent contained in the purified fume

Life of this patent

Method of decarbonating a combustion fume with extraction of the solvent contained in the purified fume

Life of this patent

Abstract

Claims15