多胺基碳氫化合物水溶液 + PZ之比熱量測研究

本研究利用示差掃描熱量計 (Differential Scanning Calorimeter, DSC) 量測比熱，主要量測多胺基碳氫化合物 + 促進劑 + 水之比熱值，量測溫度範圍為303.2353.2 K，壓力為1大氣壓。而本實驗主要研究之多胺基碳氫化合物為Diethylenetriamine (DETA)、3-(Methylamino)propylamine (MAPA)、N,N,N’,N’-Tetramethylethylenediamine (TMEDA)和N,N,N’,N’-Tetramethyl-1,3-propanediamine (TMPDA)，以及添加Piperazine (PZ)。三成分之PZ濃度為 (4, 8, 12 wt%)、多胺基碳氫化合物濃度為 (26, 22, 18 wt%)，而水成分固定在70 wt%。除了三成分系統外，亦量測多胺基碳氫化合物水溶液之比熱值實驗所量測之比熱值，以溫度與濃度當作變數做迴歸計算，純物質以二次方經驗式；雙成分系統利用過剩比熱代入RedlichKister-type equation；三成分系統則是利用Söhnel and Novotný做迴歸計算。比較迴歸結果加以討論，迴歸計算值與實驗值有良好的符合性。本研究結果可作為熱力學之基礎數據的計算依據，以及工廠設計汽提塔、熱交換器和計算蒸氣及冷卻水用量時，吸收劑的比熱將會是重要的設計數據。

關鍵字

二氧化碳；多胺基碳氫化合物；比熱

並列摘要

In this study, the molar heat capacities of four potential amine CO2 absorbents were measured in the temperature range (30 to 80)C by differential scanning calorimetry (DSC). They are the polyamines diethylenetriamine (DETA), 3-(methylamino)propylamine (MAPA), N,N,N’,N’-tetramethylethylenediamine (TMEDA), and N,N,N’,N’-tetramethyl-1,3-propanediamine (TMPDA). The heat capacities of their corresponding binary mixtures with water at concentrations (10 to 90) mol% amine, and ternary mixtures containing piperazine (PZ) were also measured. The total amine concentration of the ternary systems was fixed at 30 wt% while varying the PZ/polyamine weight ratios at 4/26, 8/22, and 12/18. A second order equation was used to represent the temperature dependence of the molar heat capacity of the pure systems. For the binary systems, the excess molar heat capacities were determined, and the data were correlated with temperature and amine mole fraction using a RedlichKister-type equation. Such correlation yield average absolute deviations (AAD) between the experimental and the calculated data of 0.2 and 2.4 for CP and CPE, respectively. Also, a modified Söhnel and Novotný equation suitably represented the temperature and concentration dependence of the CP of the ternary systems at an AAD of less than 0.1. From these results, it can be concluded that the presented data and the applied models in this study can be used in process engineering to yield accurate predictions of the CP the studied amine systems.

並列關鍵字

CO2 ； Redlich-Kister type equation ； polyamine ； Heat capacity

參考文獻

Brúder, P.; Lauritsen, K. G.; Mejdell, T. and Svendsen, H. F., CO2 Capture into Aqueous Solutions of 3-Methylaminopropylamine Activated Dimethyl-Monoethanolamine. Chem. Eng. Sci. 2012, 75, 28-37.

Chueh, C. F. and Estimation, A. C., Estimation of Liquid Heat Capacity. Chem. Eng. Prog. 1973, 69, 83-85.

Gupta, M.; Silva, E. F. d. and Svendsen, H. F., Temperature Dependent Polyamine Study for CO2 Capture. 6th Trondheim Conference on CO2 Capture, Transport and Storage, 2011.

Haines, P. J., Principles of Thermal Analysis and Calorimetry. UK, Royal Society of Chemistry, 2002.

Haines, P. J., Thermal Methods of Analysis: Principles, Applications and Problems. Blackie Academic & Professional: New York, 1995.

國際替代計量

多胺基碳氫化合物水溶液 + PZ之比熱量測研究

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