離子液體吸收二氧化碳之熱物性質量測研究

The measurements of the thermophysical properties of carbon dioxide absorption into ionic liquids.

陳季妙(Chi-Miao Chen)

指導教授 ： 李夢輝

中原大學/工學院/化學工程學系/碩士(2007年)

https://doi.org/10.6840/cycu200700493

摘要

本研究主要是利用Thermo Cahn D-110微量天平量測溫度範圍303.15~343.15 K及壓力範圍1 ~ 60 bar之二氧化碳氣體對離子溶液的溶解度。本實驗所量測離子液體濃度範圍為(98 ~ 99 %)，所量測的離子液體系統為[Bmim][PF6] 99 wt% (1-Butyl-3-methylimidazolium hexafluorophosphate, 1-丁基-3-甲基引咪六氟磷酸, CAS no. 174501-64-5), [Bmim][BF4] 99 wt% (1-n-Butyl-3-methylimidazolium tetrafluoroborate, 1-正丁基-3-甲基引咪四氟溴酸, CAS no. 174501-65-6 ), [Bmim][MeSO4] 98 wt% (1-Butyl-3-methylimidazolium methanesulfonate, 1-丁基-3-甲基引咪-甲基磺酸, CAS no. 401788-98-5 ),[Bmim][CF3SO3] 98.1 wt% (1-butyl-3-methylimidazolium Trifluoromethanesulfonate, 1-丁基-3-甲基引咪- 三氟甲基磺酸, CAS no. 174899-66-2)。
本研究所量測二氧化碳對離子液體的溶解度其標準偏差值為 1.94%。從量測出的結果可知二氧化碳對離子液體的溶解度會隨著溫度上升而下降，隨著二氧化碳壓力的增加而增加，量測結果利用Huang et al., 1985 提出高準確度的二氧化碳EOS來計算高壓二氧化碳的密度及Shiflett and Yokozeki, 2005提出的浮力計算方法來推算被吸收二氧化碳於離子液體中的溶解度。
在環境保護意識高漲的21世紀，工商業高度發展造成的溫室效應及全球暖化之議題，逐漸受世人所重視，離子液體因其低揮發性、低熔點、不易燃、可回收等突出之特點，逐漸取代傳統易燃、揮發性高、具毒性、侵害環境之有機溶劑，因此離子液體被大量應用於電化學、反應介質及催化劑，希望能利用離子液體獨特的優點，發展出低耗能、效率高的二氧化碳吸收程序。
本研究所採用四種離子液體，除[Bmim][PF6]及[Bmim][BF4]外，其餘兩項藥品於文獻上尚未有其溶解度的數值，故期望本研究結果能提供相關數值，以期日後於相關研究領域能具參考價值。

關鍵字

黏度 ； 密度 ； 溶解度 ； 二氧化碳 ； 離子液體

並列摘要

In 21st century, the environmental issues have become more important than ever. Because of the low vapor pressure, low melting point, not flammable and could be recycled, the ionic liquids replaced the organic solvents gradually.
Gaseous carbon dioxide (CO2) absorption measurements in [Bmim][PF6] 99% (1-Butyl-3-methylimidazolium hexafluorophosphate), [Bmim][BF4] 99% (1-n-Butyl-3-methylimidazolium tetrafluoroborate), [Bmim][MeSO4] 98% (1-Butyl-3-methylimidazolium methanesulfonate) and [Bmim][CF3SO3] 98.1% (1-butyl-3-methylimidazolium Trifluoromethanesulfonate) were made using a commercial gravimetric microbalance at temperatures of 303.15~343.15 K (30~70 oC) and at pressures under 60 bar. Gas solubilities were determined by the weight change of ionic liquids. The AAD% of this study of solubilities would be 1.94% . From this study can find out that the solubilities would be increase with increasing pressure and decrease with increasing temperature. Solubilities are different from ionic liquids with different anions.
Wish that this study may help to develop a process with low energy cost and high efficiency absorption CO2.

並列關鍵字

density ； carbon dioxide ； viscosity ； solubilities ； ionic liquids

參考文獻

吳福成，俄羅斯臨門一腳「京都議定書」生效，能源報導，2005年。

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