具極低共熔溶劑之雙成分熔點量測研究

Melting Points Determination for Binary Systems Exhibiting Deep Eutectic Solvents

于婷(Ting Yu)

指導教授 ： 李夢輝

中原大學/工學院/化學工程研究所/碩士(2014年)

https://doi.org/10.6840/cycu201400137

摘要

極低共熔溶液 (deep eutectic solvent, DES) 用途廣泛，可作為二氧化碳吸收劑，改善溫室效應之影響，其結構與離子液體 (room temperature ionic liquid, RTIL) 相似，相較於離子溶液，極低共熔溶劑原料較為便宜而且配製方法簡單，能兼具經濟及環保效益，其具有低揮發性、低毒性的特質，本研究主要量測雙成分極低共熔系統不同比例之熔點，系統分別為:
(1) choline chloride + urea
(2) choline chloride + malonic acid
(3) N,N-diethylethanolammonium chloride + ethylene glycol
(4) N,N-diethylethanolammonium chloride + dithylene glycol
(5) N,N-diethylethanolammonium chloride + triethylene glycol
(6) N,N-diethylethanolammonium chloride + urea
(7) N,N-diethylethanolammonium chloride + malonic acid
(8) N,N-diethylethanolammonium chloride + acetic acid
使用示差掃描熱分析儀 (differential scanning calorimeter, DSC) 量測樣品熔點，量測溫度範圍為90°C至150°C，所量測之結果使用TA Universal Analysis軟體分析DSC熱曲線，實驗求得之熔點數據以Wilson模型回歸計算參數，求得回歸參數值。觀察熔點的變化趨勢是否符合曲線，所建立之完整固液相平衡數據資料，可供相關設計參考，作為熱力學之基礎數據的計算依據。

關鍵字

極低共熔溶劑 ； 熔點

並列摘要

Deep eutectic solvents (DESs) are emerging environmentally benign alternatives to volatile organic compounds for a wide range of applications. They are also proposed as low-cost alternatives to traditional ionic liquids, and have great potential for bulk applications. They can be prepared with relative ease from the huge number of available ammonium salts and hydrogen bond donors. In this study, the following DESs were investigated:
(1) choline chloride + urea
(2) choline chloride + malonic acid
(3) N,N-diethylethanolammonium chloride + ethylene glycol
(4) N,N-diethylethanolammonium chloride + dithylene glycol
(5) N,N-diethylethanolammonium chloride + triethylene glycol
(6) N,N-diethylethanolammonium chloride + urea
(7) N,N-diethylethanolammonium chloride + malonic acid
(8) N,N-diethylethanolammonium chloride + acetic acid
The melting points of the mixtures (at different mole ratios) were measured using a differential scanning calorimeter. The phase diagram of each DES was developed, and the eutectic compositions were determined. Results showed that all the DESs investigated exhibited large depression in melting point (up to 160 K). The experimental data were well correlated by the Wilson activity coefficient model.

並列關鍵字

deep eutectic solvents ； melting points

參考文獻

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