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Hybrid behavior and mass transfer performance for absorption of CO2 into aqueous DEEA/PZ solutions in a hollow fiber membrane contactor
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2018-03-15 , DOI: 10.1016/j.seppur.2018.03.027
Hongxia Gao , Sen Liu , Ge Gao , Xiao Luo , Zhiwu Liang

The carbon dioxide (CO2) capture potential of amine blends, formed by mixing N,N-Diethylethanolamine (DEEA) and piperazine (PZ), were estimated using an improved rapid screening method. Absorption and desorption experiments were carried out at 313.15 K and 353.15 K to determine the absorption rate, cyclic CO2 capacity and regeneration rate for 2 mol/L DEEA/PZ with molar ratios of 2.00:0.00, 1.50:0.50, 1.00:1.00, 0.75:1.25, 0.50:1.50, 0.25:1.75 and 0.00:2.00. Solvent screening experimental results showed that blended DEEA/PZ solution with molar ratio of 1.50:0.50 exhibited the higher CO2 absorption rate and desorption rate, thereby yielding the highest cyclic CO2 capacity of 0.8540 mol CO2/L. In addition, the experimental results also showed synergistic effects during CO2 absorption into DEEA/PZ solution, resulting in increasing absorption and desorption rates. Also, the mass transfer performance of CO2 absorption into the best 1.50 M DEEA+ 0.5 M PZ solution was investigated in a hollow fiber membrane contactor. The effects of liquid flow rate, feed temperature range, lean CO2 loading, inert gas flow rate and CO2 partial pressure on the mass transfer performance were evaluated in terms of CO2 absorption flux and overall gas phase mass transfer coefficient (KG). Furthermore, a correlation was developed for the prediction of mass transfer coefficient (KG) for CO2 absorption into DEEA/PZ solution in a hollow fiber membrane contactor. A comparison between the experimental data and the calculated values from the improved correlation demonstrated that this model is applicable to predict the CO2 absorption performance in hollow fiber membrane contactors.



中文翻译:

中空纤维膜接触器中吸收CO 2到DEEA / PZ水溶液中的混合行为和传质性能

使用改进的快速筛选方法估算了由N,N-二乙基乙醇胺(DEEA)和哌嗪(PZ)混合形成的胺混合物的二氧化碳(CO 2)捕集潜力。在313.15 K和353.15 K上进行吸收和解吸实验,以确定摩尔比为2.00:0.00、1.50:0.50、1.00:1.00、2 mol / L DEEA / PZ的吸收速率,循环CO 2容量和再生速率。 0.75:1.25、0.50:1.50、0.25:1.75和0.00:2.00。溶剂筛选实验结果表明,摩尔比为1.50:0.50的DEEA / PZ混合溶液表现出较高的CO 2吸收速率和解吸速率,从而产生最高循环CO 2容量0.8540 mol CO 2。/升 此外,实验结果还显示了在CO 2吸收到DEEA / PZ溶液中的过程中的协同作用,从而提高了吸收和解吸速率。此外,在中空纤维膜接触器中研究了将CO 2吸收到最佳1.50 M DEEA + 0.5 M PZ溶液中的传质性能。根据CO 2吸收通量和总气相传质系数(K G),评估了液体流速,进料温度范围,稀CO 2负荷,惰性气体流速和CO 2分压对传质性能的影响。。此外,还建立了用于预测传质系数(K G),以在中空纤维膜接触器中将CO 2吸收到DEEA / PZ溶液中。实验数据和改进的相关性计算值之间的比较表明,该模型适用于预测中空纤维膜接触器中的CO 2吸收性能。

更新日期:2018-03-15
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