High-pressure density measurements for choline chloride: Urea deep eutectic solvent and its aqueous mixtures at T= (298.15 to 323.15) K and up to 50 MPa

Leron, Rhoda B.; Li, Menghui

doi:10.1016/j.jct.2012.05.008

Cited by 135 publications

(104 citation statements)

References 50 publications

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“…The measurements were performed at 10°intervals in the temperature range of 293.15 K to 363.15 K. Table 2 presents comparison of densities of pure reline and their aqueous mixtures measured with our instrumentation with those available in literature. 35 Our values are in good agreement with those reported in the literature. The dynamic viscosities (η) were measured with a Peltier-based (resolution of 0.01 K and accuracy < 0.05 K) automated Anton Paar microviscometer (model AMVn) having calibrated glass capillaries of different diameters (1.6, 1.8, 3.0, and 4.0 mm).…”

Section: ■ Experimental Sectionsupporting

confidence: 92%

“…Densities of aqueous mixtures of reline have been measured by other researchers. In a recent study, Li et al 35 reported the high-pressure densities of reline and their aqueous mixtures under pressures up to 50 MPa and temperatures of 298.15 K to 323.15 K. However, the temperature range of this report is significantly narrower. Various pharmaceutical and biotechnological industries and chemical engineering processes require knowledge of viscosity and its temperature dependence as an essential piece of information.…”

Section: ■ Introductionmentioning

confidence: 65%

“…While, Li and co-workers also reported the V E of (reline + water) to decrease with increasing temperature in the range 298.15 K to 323.15 K; 323.15 K was the highest temperature in their investigation. 35 Our V E clearly hints at complexity associated with aqueous mixtures of reline as far as interactions in the system are concerned (vide infra).…”

Section: ■ Results and Discussionmentioning

confidence: 91%

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Densities and Viscosities of (Choline Chloride + Urea) Deep Eutectic Solvent and Its Aqueous Mixtures in the Temperature Range 293.15 K to 363.15 K

2014

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Deep eutectic solvents (DESs) have been regarded as one of the most promising environmentally benign and cost-effective alternatives to conventional ionic liquids and volatile organic solvents. Aqueous mixtures of DESs have the potential to afford modified properties for specific applications. Densities and dynamic viscosities of a common and popular DES composed of choline chloride and urea in 1:2 molar ratio, named reline, and its aqueous mixtures in the temperature range 293.15 K to 363.15 K are reported. A decrease in density with increasing temperature is found to follow a quadratic expression. Excess molar volumes of the aqueous mixtures of reline are found to be negative at all temperatures and compositions. The absolute excess molar volume is found to decrease, in general, as the temperature is increased from 293.15 K to 323.15 K. For temperatures above 323.15 K, the excess molar volume does not change much with further increase in temperature to 363.15 K. The temperature dependence of dynamic viscosity of aqueous mixtures of reline in the temperature range 293.15 K to 363.15 K at all compositions is found to be better described by a Vogel−Fulcher−Tamman (VFT) model as opposed to an Arrhenius expression. Excess logarithmic viscosities for aqueous mixtures of reline are found to be negative at most temperatures and compositions; however, they become positive at 353.15 K and 363.15 K. The excess logarithmic viscosities of aqueous reline mixtures are in stark contrast to that reported for aqueous mixtures of DES glyceline, composed of choline chloride and glycerol in the same mole ratio, where the excess logarithmic viscosities are positive. Facile interstitial accommodation of water within H-bonded reline network as opposed to formation of extensive H-bonding is proposed to be the reason for this experimental observation. The important role of the H-bond donor as a constituent of DES is amply highlighted as it controls the interactions present in a DES and its aqueous mixtures. ■ INTRODUCTIONDuring the last couple of decades several greener alternatives to volatile organic compounds (VOCs) have been proposed by various research groups. Among the greener alternatives, water, supercritical CO 2 , ionic liquids, renewable solvents, liquid polymers, and so forth are becoming the obvious choices for researchers. 1−8 However, in many of these common environmentally benign alternate media, a lot of interest has been generated in ionic liquids due to their unique and tunable physicochemical properties. Among the key properties of ionic liquids, negligible vapor pressure, good thermal stability, high solubility, and nonflammability are the most noteworthy. 9−12 However, several disadvantages are also observed with common ionic liquids during their investigations, such as limited solute solubility, high viscosity, poor biodegradability, unfavorable toxicity, and high cost. 13−16 Recently, deep eutectic solvents (DESs) have emerged as attractive alternatives to ionic liquids showing several advantages over the latte...

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Section: ■ Experimental Sectionsupporting

confidence: 92%

Section: ■ Introductionmentioning

confidence: 65%

Section: ■ Results and Discussionmentioning

confidence: 91%

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Densities and Viscosities of (Choline Chloride + Urea) Deep Eutectic Solvent and Its Aqueous Mixtures in the Temperature Range 293.15 K to 363.15 K

2014

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“…Figure 1, shows a comparison between the measured density data of this work with those reported in the literature for the DES10-2 (ChCl:urea, 1:2). The density data generated by this work deviates by an average of 1.41% from those reported by Yadav and Pandey [16] and Liron and Li [29]. This may be due to the method of preparing the DES.…”

Section: Resultscontrasting

confidence: 73%

Molar volume of eutectic solvents as a function of molar composition and temperature

Mjalli

2016

Chinese Journal of Chemical Engineering

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“…The overall estimated uncertainty of the measurements was ±0.1% while the accuracy of the proposed correlation was ±0.003%. The detailed experimental procedure for the density measurements, including the apparatus and the calibration method used, are discussed in our previous work [33]. The modified Tait-type equation is expressed as …”

Section: Calculation Of Buoyancy Effectsmentioning

confidence: 99%

Solubility of carbon dioxide in a eutectic mixture of choline chloride and glycerol at moderate pressures

Leron

2013

The Journal of Chemical Thermodynamics

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High-pressure density measurements for choline chloride: Urea deep eutectic solvent and its aqueous mixtures at T= (298.15 to 323.15) K and up to 50 MPa

Cited by 135 publications

References 50 publications

Densities and Viscosities of (Choline Chloride + Urea) Deep Eutectic Solvent and Its Aqueous Mixtures in the Temperature Range 293.15 K to 363.15 K

Densities and Viscosities of (Choline Chloride + Urea) Deep Eutectic Solvent and Its Aqueous Mixtures in the Temperature Range 293.15 K to 363.15 K

Molar volume of eutectic solvents as a function of molar composition and temperature

Solubility of carbon dioxide in a eutectic mixture of choline chloride and glycerol at moderate pressures

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