关键词:

二氧化碳, 填料塔, 氢氧化钠, 一乙醇胺, 二乙醇胺, 有效相界面积

Abstract: A packed tower was used to investigate the removal of CO₂ from polluted air using aqueous alkaline solutions. Experiments were conducted with NaOH concentration 0.30—0.97 kmol·m^-3, MEA concentration 0.02—0.50 kmol·m^-3 and DEA concentration 0.10-0.50 kmol·m^-3 at 25 ℃. A mathematical model based on chemical absorption was proposed. The effective gas-liquid interfacial area (a_v) was calculated from the results of CO₂ absorption into aqueous solutions of sodium hydroxide. For the solutions of MEA and DEA, the overall reaction rate constant (k_ov)_expwas obtained from the results of the experiments and a_v calculated from NaOH-CO₂ system. The overall reaction rate of MEA is much higher than that of DEA. The predictions of the theoretical model were compared with the experimental data and results from literature. Both the experimental data and the results from literatures were in good agreement with the model predictions.

Key words:

二氧化碳, 填料塔, 氢氧化钠, 一乙醇胺, 二乙醇胺, 有效相界面积