Effect and Mechanism of 1‑Hexyl-3-methylimidazolium-Based Ionic Liquids on the Isobaric Vapor–Liquid Equilibria of Methanol + Acetonitrile at 101.3 kPa

This work studied the separation effect of 1-hexyl-3-methylimidazolium-based ionic liquids (1-hexyl-3-methylimidazolium tetrafluoroborate [HMIM]­[BF4] and 1-hexyl-3-methylimidazolium trifluoromethanesulfonate [HMIM]­[OTF]) to separate a methanol and acetonitrile azeotropic system. The isobaric vapor...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2020-11, Vol.65 (11), p.5405-5412
Main Authors: Zhu, Jiujuan, Fan, Hanhan, Sun, Bing, Qi, Hongbin
Format: Article
Language:English
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Summary:This work studied the separation effect of 1-hexyl-3-methylimidazolium-based ionic liquids (1-hexyl-3-methylimidazolium tetrafluoroborate [HMIM]­[BF4] and 1-hexyl-3-methylimidazolium trifluoromethanesulfonate [HMIM]­[OTF]) to separate a methanol and acetonitrile azeotropic system. The isobaric vapor–liquid equilibrium data obtained for the ternary systems {methanol + acetonitrile + ([HMIM]­[BF4] or [HMIM]­[OTF])} were measured at 101.3 kPa. Based on the nonrandom two-liquid model, the minimum mole fractions of [HMIM]­[BF4] and [HMIM]­[OTF] required to eliminate the azeotrope point of the methanol + acetonitrile mixtures were 0.047 and 0.042, respectively. Through the analysis of the σ-profiles and separation ability, [HMIM]­[OTF] was a suitable entrainer to separate the methanol–acetonitrile azeotrope.
ISSN:0021-9568
1520-5134
DOI:10.1021/acs.jced.0c00532