Dynamic viscosities of binary mixtures of cycloalkanes with primary alcohols at T = (293.15, 298.15, and 303.15) K: New UNIFAC-VISCO interaction parameters
Introduction
Among all physical properties, the knowledge of the viscosity of liquid mixtures and their dependence with composition and temperature is very important for design the industrial processes. Indeed, viscosity is a fundamental characteristic of substances such as adhesives, lubricants, paintings, etc. As an extension of our work concerning dynamic viscosity of binary systems alkanes with alcohols [1], [2], [3], in this paper, we show experimental dynamic viscosity, density, and speed of sound data of {x1 cyclohexane + (1 − x1) ethanol}, {x1 cyclohexane + (1 − x1) 1-propanol}, {x1 cyclohexane + (1 − x1) 1-butanol}, {x1 cyclopentane + (1 − x1) ethanol}, {x1 cyclopentane + (1 − x1) 1-propanol}, and {x1 cyclopentane + (1 − x1) 1-butanol} at T = (293.15, 298.15, and 303.15) K. Experimental data were used to calculate excess molar volumes, molar isentropic compression, excess molar isentropic compression, and excess free energy of activation over the entire mole fraction range. Viscosity data were correlated using the UNIQUAC [4] equation.
The UNIFAC-VISCO [5], [6] and ASOG-VISCO [7] methods have been applied to predict the viscosity of these systems and the results were compared with the experimental data. Both methods are based on the Eyring theory [8] and on group contributions methods. To improve the results of the prediction of the UNIFAC-VISCO method, the interaction parameter CHcy/-OH have been determined.
Section snippets
Chemicals
The pure components were supplied by Fluka (cyclohexane and cyclopentane) and Merck (1-propanol, 1-butanol, and 1-pentanol). The components were degassed ultrasonically, and dried over molecular sieves Type 4 Å, 4 · 10−8 cm, that were supplied by Aldrich, and kept in inert argon with a maximum content in water of 2 · 10−6 by mass fraction. The maximum water contents of the liquids were determined using a Metrohm 737 KF coulometer. Their mass fraction purities were >0.998 for cyclohexane, ethanol, and
Results and discussion
Dynamic viscosity, density, speed of sound, excess molar volume and molar isentropic compression, excess molar isentropic compression, and excess free energy of activation for the binary systems {x1 cyclohexane + (1 − x1) ethanol}, {x1 cyclohexane + (1 − x1) 1-propanol}, {x1 cyclohexane + (1 − x1) 1-butanol}, {x1 cyclopentane + (1 − x1) ethanol}, {x1 cyclopentane + (1 − x1) 1-propanol}, and {x1 cyclopentane + (1 − x1) 1-butanol} at T = (293.15, 298.15 and 303.15) K and atmospheric pressure are reported in TABLE 2, TABLE 3
Correlation and prediction
The UNIQUAC equation is used for calculating of the excess molar free energy of activation for flow, ΔG∗E, which is related to the viscosity by:where ν is the kinematic viscosity and M and Mi are the molar mass of the mixture and the pure component, respectively.
The correlation has been performed with experimental data using the UNIQUAC equation for calculating of the excess molar free energy, minimizing the following objective function:
Conclusions
In this work, the dynamic viscosities, densities, and speed of sound of cyclohexane (1) and cyclopentane (1) with ethanol (2), 1-propanol (2), and 1-butanol (2) at several temperatures T = (273.15, 298.15, and 303.15) K over the whole composition range have been determined.
Excess molar volume, excess molar isentropic compression, and excess free energy of activation were calculated and fitted to the Redlich–Kister equation to test the quality of the experimental values. The correlation of the
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Thermo-physical and spectral investigations of binary liquid mixture of 2-(2-butoxyethoxy) ethanol with alcohols at temperature range of 293.15 K to 313.15 K
2020, Journal of Chemical ThermodynamicsFundamental multiparameter and association equation of state for ethanol
2017, Fluid Phase EquilibriaAcoustic, volumetric, transport and spectral studies of binary mixtures of 1-tert-butoxy-2-propanol with alcohols at different temperatures
2015, Journal of Molecular LiquidsCitation Excerpt :The mass percentage water content by Karl-Fischer analysis of the chemicals was found to be 0.02%. The purities of solvents were further ascertained by comparing their densities, viscosities and speeds of sound at 298.15 K temperature with values reported in the literature [9,11–18] as shown in Table 2. Each of the binary mixtures was prepared by weighing appropriate amounts of 1-tert-butoxy-2-propanol and each alcohol mentioned above on an A&D Company limited electronic balance (Japan, Model GR-202) electronic balance, with a precision of ± 0.01 mg, by syringing each component into airtight narrow mouthed stoppered bottles to minimize evaporation losses.
Molecular interactions in binary mixtures of 1-butoxy-2-propanol with alcohols at different temperatures: A thermophysical and spectroscopic approach
2014, Journal of Chemical ThermodynamicsCitation Excerpt :The mass percentage water content by Karl-Fisher analysis of the chemicals was found to be 0.02%. The purities of solvents were further ascertained by comparing their densities and speeds of sound at T = 298.15 K temperature with values reported in the literature [12–20] as shown in table 2. Each binary mixture was prepared by weighing appropriate amounts of 1-butoxy-2-propanol and each alcohol mentioned above on an A&D Company limited electronic balance (Japan, Model GR-202) electronic balance, with a precision of ±0.01 mg, by syringing each component into airtight narrow mouthed stoppered bottles to minimise evaporation losses.
Densities, viscosities, and isobaric heat capacities of the system (1-butanol + cyclohexane) at high pressures
2014, Journal of Chemical ThermodynamicsCitation Excerpt :The average absolute relative deviations can be considered in good agreement between our density data and those previously reported in the literature [8–21]; namely, with results compared to those previously reported by Aminabhavi et al. [8], Awwad et al. [9], Beg et al. [10], Jonas et al. [11], Padua et al. [12], Pardo et al. [13], Silva et al. [14], Sommer et al. [15], Sun et al. [16], Takagi et al. [17], Tanaka et al. [18], Yang et al. [19], Vega-Maza et al. [20] and values calculated from the equation of state of Penoncello et al. [21], the average absolute relative deviations in percentages are (0.01, 0.02, 0.02, 0.04, 0.04, 0.02, 0.04, 0.02, 0.04, 0.07, 0.04, 0.02, 0.04, 0.11)%, respectively. The comparison for the binary system was only possible at atmospheric pressure and the average absolute relative deviations in percentages were 0.01% [22], 0.03% [23], and 0.05% [24]. The fitting coefficients, standard deviation and the maximum deviation of the experimental density are listed in table 4.