離子液體在萃取劑上的應用

Applications of Ionic Liquids as Entrainer

陳宏興(Hung-Hsing Chen)

指導教授 ： 錢義隆

國立臺灣大學/工學院/化學工程學研究所/碩士(2016年)

https://doi.org/10.6342/NTU201602145

摘要

本研究提供一個在Aspen Plus模擬軟體中建立離子液體熱力學模型的方法，並對離子液體當作萃取劑的萃取蒸餾程序進行程序設計，及比較傳統萃取劑與離子液體萃取蒸餾程序之間的異同。本研究探討丙酮/甲醇系統和異丙醇去水系統的萃取蒸餾程序。丙酮與甲醇系統中，探討二甲基亞碸(DMSO)和1,3-二甲基咪唑二甲基磷酸鹽([MMIM][DMP])兩種不同萃取劑。異丙醇去水系統中，在異丙醇99.9999 mol%與99.99 mol%兩種不同產物規格要求下，探討DMSO和1-乙基-3-甲基咪唑醋酸鹽([EMIM][OAC])兩種不同萃取劑。
丙酮/甲醇系統中，兩個驟沸器程序能夠被用來回收[MMIM][DMP]，兩個驟沸器程序的年度總成本(TAC)節省16.43%，其中操作成本節省12.71%，設備成本節省30.41%。異丙醇去水系統中，兩個驟沸器程序或驟沸器/氣提塔程序能夠被用來回收[EMIM][OAC]。在異丙醇99.9999 mol%產物規格要求下，兩種程序的年度總成本(TAC)分別增加了0.37%和0.04%，而在異丙醇99.99 mol%產物規格要求下，兩種程序的年度總成本(TAC)則分別節省了7.19%和8.34%。
離子液體揮發度低且與普通物質沸點差距大，所以程序中並不會損失而且能夠以兩個低壓驟沸器回收高純度離子液體，然而，離子液體的高沸點性質與部分離子液體的熱穩定性低，導致離子液體的回收會相當困難，設備必須操作在較低壓的條件下。因此，有良好提升系統雙成分的相對揮發度和有良好熱穩定性的離子液體是較好的萃取劑。

關鍵字

離子液體 ； 萃取蒸餾 ； 共沸物分離 ； 程序設計 ； 丙酮 ； 甲醇 ； 異丙醇

並列摘要

This research provides a way to establish thermodynamic models of ionic liquids in Aspen Plus, does the process design about extractive distillation using ionic liquids as entrainer and compares the extractive distillation using ionic liquids as entrainer with the one using conventional entrainer. Acetone /methanol system and isopropanol (IPA) dehydration system are investigated. In acetone/methanol system, dimethylsulfoxide (DMSO) as entrainer and 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]) as entrainer are investigated. In IPA dehydration system, DMSO as entrainer and 1-ethyl-3-methylimidazolium acetate ([EMIM][OAC]) as entrainer are studied under 99.9999 mol% and 99.99 mol% IPA product requirements.
In acetone/methanol system, two-flashers process can be used to recycle [MMIM][DMP]. The two-flashers process has 16.43% reduction in total annual cost (TAC). The operating cost and the capital cost are 12.71% and 30.41% lower respectively. In IPA dehydration system, two-flashers process or flasher/stripper process can be used to recycle [EMIM][OAC]. Under 99.9999 mol% IPA product requirement, the two processes have 0.37% and 0.04% increases in TAC respectively. Under 99.99 mol% IPA product requirement, the two processes have 7.19% and 8.34% decreases in TAC respectively.
Because of the low volatility of ionic liquids and the large boiling point differences between ionic liquids and normal materials, ionic liquids would not loss in the process and can be recoverd by two flashers under low pressure condition. However, high boiling point of ionic liquids and low thermal stability of some ionic liquids make the recycle of ionic liquids difficult, so the equipments need to be operated under lower pressure condition. Therefore, ionic liquids with better ability to enhance relative volatility of the mixture to be separated and better thermal stability would be better entrainer.

並列關鍵字

Ionic liquids ； Extractive distillation ； Azeotropic separation ； Process design ； Acetone ； Methanol ； Isopropanol

參考文獻

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