- 學位論文
混合醇胺 (三級醇胺 4-DMAB, DMAPD + 多元胺 DAP, DETA, MAPA) 水溶液之莫耳比熱量測研究
Molar heat capacity measurement for aqueous blended amine system containing 4-(Dimethylamino)-1-butanol, 3-(Dimethylamino)-1,2-propanediol and 1,3-Diaminopropane, Diethylenetriamine and 3-methylaminopropylamine
摘要
摘要 本研究以示差掃描熱分析儀 (Differential Scanning Calorimeter, DSC) 量測混合醇胺水溶液之莫耳比熱。本實驗所使用之三級醇胺分別為4-(Dimethylamino)-1-butanol (4-DMAB)、3-(Dimethylamino)-1,2-propanediol (DMAPD) 與多元胺1,3-Diaminopropane (DAP)、Diethylenetriamine (DETA)、3-methylaminopropylamine (MAPA)。 純物質系統 (pure amine) 量測三級醇胺4-DMAB及DMAPD；雙成分系統 (tertiary amine / H2O)，濃度範圍在莫耳分率xamine=0.1-0.9；三成分系統 (tertiary amine / polyamine / H2O) 量測三級醇胺與多元胺之混合水溶液莫耳比熱，並分別將水濃度固定在60 wt% 以及 70 wt%進行討論，其中當水濃度為60 wt%時，三級醇胺與多元胺濃度比例為 (20/20、10/30、5/35 wt%) ；當水濃度為70 wt%時，三級醇胺與多元胺濃度比例為 (15/15、10/20、5/25 wt%)。量測溫度範圍為303.15 – 353.15K，本實驗之不確定性 (uncertainty) 為 2%。 所量測之莫耳比熱以濃度及溫度之關係式表示，純物質系統以二次經驗方程式進行迴歸計算；雙成分系統以Redlich-Kister-type equation進行迴歸；三成分系統則使用Söhnel and Novotný關係式作迴歸計算。比較迴歸計算結果與實驗值，純物質系統之平均絕對偏差 (AAD) 小於1%；而雙成分系統中比熱之平均絕對偏差為0.2%，過剩比熱之平均絕對偏差為3.2%，均具有良好的符合性，而本研究結果可作為工廠設計氣提塔、熱交換器及冷卻水用量時的重要依據。
並列摘要
Abstract In this study, the molar heat capacity of blended amine systems was determined by Differential Scanning Calorimeter (DSC). The tertiary amines 4-(Dimethylamino)-1-butanol (4-DMAB), 3-(Dimethylamino)-1,2-propanediol (DMAPD), and polyamines 1,3-Diaminopropane (DAP), Diethylenetriamine (DETA), 3-methylaminopropylamine (MAPA) were applied for this measurement. The experiment was carried out under atmospheric pressure, and the temperature was in the range of 303.15 – 353.15 K. For pure amine system, the heat capacity of tertiary amine 4-DMAB, DMAPD were presented in this work. The binary aqueous tertiary amines systems were also studied in the concentration of 0.1 - 0.9 molar fraction. And the ternary systems, including blended tertiary amines and polyamines, were investigated at total amine 30 wt% and 40 wt%. The uncertainty at overall measurement was 2%. Several thermodynamic model were use for representing the experiment data as the function of temperature and concentration in this study. The regression of pure amine system was accomplished by the used of second order empirical equation. The Redlich-Kister-type equation and modified Söhnel and Novotný equation were respectively applied to represent the experiment data of binary and ternary system. The results show a good agreement between experiment data and regressive calculations. The results in this work can be used in the design of stripping tower, heat exchanger and consumption of cooling water.