Isobaric vapor-liquid equilibria for the isobutanol-water-1-butyl-3-methylimidazolium tetrafluoroborate ternary system

LI QunSheng;HUANG XiaoQiao;ZHANG JiGuo;HE XiuGiong

Journal of Beijing University of Chemical Technology ›› 2010, Vol. 37 ›› Issue (2) : 25-29.

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Journal of Beijing University of Chemical Technology ›› 2010, Vol. 37 ›› Issue (2) : 25-29.
化学与化学工程

Isobaric vapor-liquid equilibria for the isobutanol-water-1-butyl-3-methylimidazolium tetrafluoroborate ternary system

  • LI QunSheng;HUANG XiaoQiao;ZHANG JiGuo;HE XiuGiong

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Abstract

Isobaric vapor-liquid equilibrium data for the isobutanol-water system containing the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4 )were measured in a modified Othmer still at 101.32kPa. The vapor-liquid equilibrium curve for the isobutanol-water with added IL deviates from that of the binary system when the mole fraction of [BMIM]BF4 reaches 10%. When the mole fraction of [BMIM]BF4 is 20% or 30%, the deviation is greater. The IL shows a salt effect, which increases the volatility of isobutanol relative to that of water, and even leads to the disappearance of the azeotropic point. Increasing addition of [BMIM]BF4 results in the salt effect becoming more distinct, and the volatility of isobutanol relative to water increases. As a result, it is concluded that [BMIM]BF4 can be employed as a salt in the extractive distillation of the isobutanol-water system. The optimum mole fraction of [BMIM]BF4 is about 20%, and the VLE data obtained allow the design of the process to be optimized.

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LI QunSheng;HUANG XiaoQiao;ZHANG JiGuo;HE XiuGiong

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Isobaric vapor-liquid equilibria for the isobutanol-water-1-butyl-3-methylimidazolium tetrafluoroborate ternary system[J]. Journal of Beijing University of Chemical Technology, 2010, 37(2): 25-29

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