| 摘要 |
<p>PURPOSE: To remove efficiently CO2 in combustion exhaust gas by bringing aqueous solution containing an amine compound represented by specified formula and a specified piperazine compound into contact with combustion gas under atmospheric pressure. CONSTITUTION: In the case of removing CO2 in combustion exhaust gas in a boiler, an amine compound represented by formula (wherein R<1> represents hydrogen atom, 1-4C lower alkyl, R<2> represents hydrogen atom, methyl group) aqueous solution containing a piperazine compound selected out of a group of piperazine, 2-methylpiperazine, 2,3-dimethylpiperazine, 2,5-dimethylpiperazine and combustion exhaust gas are brought into contact with each other. At that time, it is preferade to use 2-methylpiperazine as piperazine compound, and 2-(n-butylamino) ethanol is used as amine compound. The concentration of amine compound in the water solution is set in the range of 15-65wt.%, while the concentration of piperazine compound is set in the range of 1.5-65wt.%.</p> |
