Equilibrium Total Pressure and CO2 Solubility in Binary and Ternary Aqueous Solutions of 2-(Diethylamino)ethanol (DEEA) and 3-(Methylamino)propylamine (MAPA)

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• 作者：Muhammad Waseem Arshad ; Hallvard Fj酶sne Svendsen ; Philip Loldrup Fosb酶l ; Nicolas von Solms ; Kaj Thomsen
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：March 13, 2014
• 年：2014
• 卷：59
• 期：3
• 页码：764-774
• 全文大小：504K
• 年卷期：v.59,no.3(March 13, 2014)
• ISSN：1520-5134

文摘

Equilibrium total pressures were measured and equilibrium CO₂ partial pressures were calculated from the measured total pressure data in binary and ternary aqueous solutions of 2-(diethylamino)ethanol (DEEA) and 3-(methylamino)propylamine (MAPA). The measurements were carried out in a commercially available calorimeter used as an equilibrium cell. The examined systems were the binary aqueous solutions of 5 M DEEA, 2 M MAPA, and 1 M MAPA and the ternary aqueous mixtures of 5 M DEEA + 2 M MAPA (5D2M) and 5 M DEEA + 1 M MAPA (5D1M), which gave liquid鈥搇iquid phase split upon CO₂ absorption. The total pressures were measured and the CO₂ partial pressures were calculated as a function of CO₂ loading at three different temperatures 40 掳C, 80 掳C, and 120 掳C. All experiments were reproduced with good repeatability. The measurements were carried out for 30 mass % MEA solutions to validate the experimental method. All the measured data were also compared with the results of 30 mass % MEA as a reference case. 5 M DEEA has shown high cyclic capacity. Both 2 M and 1 M MAPA showed high loading capacities at 40 掳C and 120 掳C. The aqueous amine mixtures, 5D2M and 5D1M, gave fairly good cyclic capacities and their results depend on the concentration of the promoter (MAPA) in the mixture. Approximate enthalpies of absorption of CO₂ in all the tested aqueous amine systems were estimated from the CO₂ solubility data. The measured total pressure and the estimated CO₂ solubility data can be useful in thermodynamic modeling of the capture systems when aqueous DEEA鈥揗APA solutions are used as capture solvents.