Mass Transfer Coefficients for CO2 Absorption into Aqueous Ammonia Using Structured Packing

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• 作者：Wenbin Li ; Xingjian Zhao ; Botan Liu ; Zhongli Tang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 9, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：6185-6196
• 全文大小：571K
• 年卷期：v.53,no.14(April 9, 2014)
• ISSN：1520-5045

文摘

In this study, the gas phase volumetric overall mass transfer coefficients (K_Ga_e) for CO₂ absorption into aqueous ammonia solutions were measured to explore the mass transfer performance of a column packed with structured packing. The K_Ga_e values were evaluated over ranges of main operating variables, that are, 1400鈥?300 m³路m^鈥?路h^鈥? gas flow rate, 20鈥?9 m³路m^鈥?路h^鈥? liquid flow rate, up to 8 kPa partial pressure of CO₂, and 0.27鈥?.72 kmol路m^鈥? ammonia concentration. The results show that higher liquid loading and concentration of aqueous ammonia are beneficial to enhance the K_Ga_e values. On the contrary, K_Ga_e value decreases as the CO₂ partial pressure increases. The results also show that gas loading has little influence on K_Ga_e. To allow the mass transfer data to be readily utilized, an empirical K_Ga_e correlation for this system was developed. Finally, Simulations were made for the absorption of CO₂ into aqueous ammonia solutions by using the currently developed computational mass transfer model along with the proposed correlation for K_Ga_e. The simulation results on the gas phase CO₂ concentration are found to be in satisfactory agreement with the experimental measurements.