Temperature Dependence of Physicochemical Properties of Imidazolium-, Pyroldinium-, and Phosphonium-Based Ionic Liquids

AlTuwaim, Mohammad S.; Alkhaldi, Khaled H.A.E.; Al-Jimaz, Adel S.; Mohammad, Abubaker A.

doi:10.1021/je500093z

Cited by 75 publications

(85 citation statements)

References 62 publications

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“…[C4C1im][BF4] in 14 papers, 12,15,19,23,27,28,83,103,106,112,113,117-119 and [C4C1im][PF6] in 19 papers 12,13,15,18,19,21,22,27,33,75,[87][88][89][105][106][107][108][109][110] . However, for [C4C1im][BF4], the identical speeds of sound data as obtained by Govinda et al 83 are reported by Kavitha et al 103 Garcia-Miaja et al 112,113 cited data published by Zafarani-Moattar and Shekaari.…”

Section: Overview Of Existing Data For Ionic Liquidsmentioning

confidence: 99%

Speed of Sound and Ultrasound Absorption in Ionic Liquids

et al. 2017

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A complete review of the literature data on the speed of sound and ultrasound absorption in pure ionic liquids (ILs) is presented. Apart of the analysis of data published to date, the significance of the speed of sound in ILs is regarded. An analysis of experimental methods described in the literature to determine the speed of sound in ILs as a function of temperature and pressure is reported, and the relevance of ultrasound absorption in acoustic investigations is discussed. Careful attention was paid to highlight possible artifacts, and side phenomena related to the absorption and relaxation present in such measurements. Then, an overview of existing data is depicted to describe the temperature and pressure dependences on the speed of sound in ILs, as well as the impact of impurities in ILs on this property. A relation between ions structure and speeds of sound is presented by highlighting existing correlation and evaluative methods described in the literature. Importantly, a critical analysis of speeds of sound in ILs vs those in classical molecular solvents is presented to compare these two classes of compounds. The last part presents the importance of acoustic investigations for chemical engineering design and possible industrial applications of ILs.

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Section: Overview Of Existing Data For Ionic Liquidsmentioning

confidence: 99%

Speed of Sound and Ultrasound Absorption in Ionic Liquids

et al. 2017

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“…Therefore, imidazolium‐based ILs are used in our work due to their higher selectivity and lower viscosity. Since the selectivity of imidazolium‐based ILs is inversely proportional to their viscosity which is proportional to the length of cation side chain, [BMIM][Ac] is suggested as the solvent to separate the mixture of acetonitrile and ethanol. In order to verify the outstanding separation performance of [BMIM][Ac], the vapor–liquid equilibrium (VLE) data of the acetonitrile + ethanol +[BMIM][Ac] were determined at 101.3 kPa in the following section.…”

Section: Ionic Liquid Screenmentioning

confidence: 99%

“…41 Therefore, imidazolium-based ILs are used in our work due to their higher selectivity and lower viscosity. Since the selectivity of imidazolium-based ILs is inversely proportional to their viscosity which is proportional to the length of cation side chain, [55][56][57][58][59] [BMIM][Ac] is suggested as the solvent to separate the mixture of acetonitrile and ethanol. In order to verify Owing to their hygroscopicity, both ILs were desiccated at 365 K for 24 h using vacuum drying oven (DZF-6020, Boxun, Shanghai, China) prior to experiment, and the Karl Fisher (KF) titration was employed to detect the water content of ILs.…”

Section: Computational Detailsmentioning

confidence: 99%

COSMO‐RS based ionic liquid screening for the separation of acetonitrile and ethanol azeotropic mixture

Zhang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The selection of competent entrainer is very important for separating azeotrope systems by extractive distillation. Ionic liquids (ILs) are outstanding entrainers due to their excellent properties. However, it is time‐consuming to choose suitable ILs from the huge database of anions and cations. Herein, the selectivity and viscosity of ILs were combined as double standards to select suitable ILs for the separation of acetonitrile and ethanol mixture. RESULTS The selectivity and viscosity of 450 ILs (25 cations and 18 anions) were predicted based on Conductor‐like Screening Model for Real Solvents (COSMO‐RS). 1‐Butyl‐3‐methylimidazolium acetate [BMIM][Ac] was selected as a potential entrainer due to its higher selectivity and lower viscosity and [BMIM][Cl] was chosen as a comparison item as ILs with [Cl]− anion have separation performance next to [Ac]−‐based ILs. The vapor–liquid equilibrium (VLE) data of the acetonitrile + ethanol + ILs systems were determined at 101.3 kPa and correlated with the non‐random two‐liquid (NRTL) model. The result showed that the addition of the two ILs produced a salting‐out effect on acetonitrile and enhanced the relative volatility of acetonitrile to ethanol. Furthermore, [BMIM][Ac] exhibited better separation performance than [BMIM][Cl] and our previous reported ILs, which are consistent with the predicted results. The reduced density gradient (RDG) method indicated that hydrogen bonding dominated the interactions between ethanol and IL. CONCLUSION [BMIM][Ac] is a superior entrainer for the separation of acetonitrile–ethanol azeotrope. Compared to the previously studied ILs, there is a stronger hydrogen bond between ethanol and [BMIM][Ac]. This makes ethanol ‘bundled’ and acetonitrile more volatile, resulting in the superior separation performance of [BMIM][Ac]. © 2019 Society of Chemical Industry

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“…where M 1 and M 2 are the molar masses of pure water and pure IL, respectively, x 2 is the mole fraction of IL in the aqueous solution, ρ, ρ 0 and ρ 1 are the densities of solution, pure water and pure IL [10,19] and figures 5, 6, respectively. Alternatively, the excess molar volume data can also be expressed in terms of the molality of solution at any temperature as,…”

Section: Tablementioning

confidence: 99%