A Model for Estimating CO~2 Solubility in Aqueous Alkanolamines
A Model for Estimating CO~2 Solubility in Aqueous Alkanolamines
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DOI：
10.1021/ie048857i
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发表时间：
2005-03
影响因子：
4.2
通讯作者：
J. Gabrielsen;M. Michelsen;E. Stenby;G. Kontogeorgis
中科院分区：
文献类型：
--
作者：
J. Gabrielsen;M. Michelsen;E. Stenby;G. Kontogeorgis
二氧化碳（CO2）的分压超过单乙醇胺（MEA），二乙醇胺（DEA），和N-甲基二乙醇胺（MDEA）的水溶液已使用一个简单的方法，其中只有一个化学平衡反应被考虑在内，并假设理想的气体和理想的液体性质。该方法结合了亨利定律常数和化学反应平衡常数形成的氨基甲酸酯的伯和仲烷醇胺（MEA，DEA）或碳酸氢盐叔烷醇胺（MDEA），从而在一个明确的表达式计算二氧化碳分压的烷醇胺水溶液。对于有限的负荷、温度和压力范围，获得了CO2分压的精确值，这在模拟燃煤电厂的CO2捕获中是有用的。从该模型得出的吸收值与文献中的实验数据一致。
Partial pressures of carbon dioxide (CO2) over aqueous solutions of monoethanolamine (MEA), diethanolamine (DEA), and N-methyldiethanolamine (MDEA) have been correlated using a simple approach where only one chemical equilibrium reaction is taken into account and assuming ideal gas and ideal liquid properties. The approach combines the Henry's law constant and the chemical reaction equilibrium constant for the formation of carbamate for primary and secondary alkanolamines (MEA, DEA) or bicarbonate for tertiary alkanolamines(MDEA), resulting in an explicit expression for calculating the partial pressure of CO2 over an aqueous alkanolamine solution. Accurate values for the partial pressure of CO2 are obtained for a limited loading, temperature, and pressure range that is useful in modeling CO2 capture from coal-fired power plants. Heat of absorption values derived from the model agree with experimental data from the literature.