Method of decarbonating a combustion fume with extraction of the solvent contained in the purified fume
First Claim
1. 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, andb) 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.
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Accused Products
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.
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Citations
15 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- carbon oxides, nitrogen oxides and sulfur oxides, wherein the following stages are carried out;
Specification