Absorption of carbon dioxide in piperazine activated concentrated aqueous 2-amino-2-methyl-1-propanol solvent
Absorption of carbon dioxide in piperazine activated concentrated aqueous 2-amino-2-methyl-1-propanol solvent
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DOI：
10.1016/j.ces.2011.02.028
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发表时间：
2011-07
影响因子：
4.7
通讯作者：
S. Dash;A. Samanta;A. Samanta;S. Bandyopadhyay
中科院分区：
文献类型：
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作者：
S. Dash;A. Samanta;A. Samanta;S. Bandyopadhyay
本文报道了哌嗪（PZ）活化的2-氨基-2-甲基-1-丙醇（AMP）浓水溶液在303- 323 K温度范围内吸收CO2速率的新实验数据。在湿壁接触器中进行了CO_2分压为5- 15 kPa的吸收实验。PZ用作速率活化剂，浓度范围为2至8wt%，保持溶液中的总胺浓度为40wt%。测定了AMP+PZ浓水溶液的密度、粘度等物理性质以及CO2在AMP+PZ浓水溶液中的物理溶解度。还提供了303- 323 K温度范围内CO_2在AMP+PZ浓水溶液中的汽液平衡实验数据。汽液平衡测定是在平衡池中进行的，CO_2压力范围为0.1- 140 kPa。采用基于电解质非随机双液理论的热力学模型，对CO2在AMP+PZ水溶液中的汽液平衡进行了模拟。考虑到有机胺浓溶液的非理想性，采用eNRTL模型计算了有机胺的活度系数，估算了有机胺的液相形态。根据Higbie的渗透理论建立了CO2在胺水溶液中的吸收传质-反应动力学模型。模型预测结果与实验结果吻合较好。
In this work new experimental data on the rate of absorption of CO2into piperazine (PZ) activated concentrated aqueous solutions of 2-amino-2-methyl-1-propanol (AMP) over the temperature range 303–323K are presented. The absorption experiments have been carried out in a wetted wall contactor over CO2partial pressure range of 5–15kPa. PZ is used as a rate activator with a concentration ranging from 2 to 8wt% keeping the total amine concentration in the solution at 40wt%. The physical properties such as density and viscosity of concentrated aqueous AMP+PZ, as well as physical solubility of CO2in concentrated aqueous AMP+PZ, are also measured. New experimental data on vapor liquid equilibrium (VLE) of CO2in these concentrated aqueous solutions of AMP+PZ in the temperature range of 303–323K have also been presented. The VLE measurements are carried out in an equilibrium cell in CO2pressure range of 0.1–140kPa. A thermodynamic model based on electrolyte non-random two-liquid (eNRTL) theory is used to represent the VLE of CO2in aqueous AMP+PZ. Liquid phase speciations are estimated considering the nonideality of concentrated solutions of the amines and the calculated activity coefficients by eNRTL model. The CO2absorption in the aqueous amine solutions is described by a combined mass transfer-reaction kinetics model developed according to Higbie's penetration theory. The model predictions have been found to be in good agreement with the experimental results of the rates of absorptions of CO2into aqueous AMP+PZ.