| 초록 |
SO2 emissions from fossil-fuel-fired power plants are one of the major sources of air pollution. Although SO2 is an environmentally harmful gas, it is a chemical that can be used in many application areas such as a precursor to sulfuric acid, a reducing agent and a preservative for food and wine. In this study, reversible absorption of SO2 was investigated in aqueous solutions of the diverse cyclic diamines: piperazine (PZ, pKb2 = 4.3, pKb1 = 8.7), 1-methyl piperazine (MMP, pKb2 = 4.9, pKb1 = 9.1), and 1,4-dimethylpiperazine (DMP, pKb2 = 5.5, pKb1 = 9.4). Among these three kinds of piperazine, only DMP showed reversible absorption of SO2, indicating that reversible SO2 absorption capacity was 0.5 mol SO2 / mol DMP. The absorption and desorption performance of the diamine compounds were greatly affected by the basicity of the amine sites. Spectroscopic and experimental results suggested that in the presence of water, SO2 is absorbed on absorbent as a bisulfite species. |
