Density, Viscosity, Vapor−Liquid Equilibrium, and Excess Molar Enthalpy of [Chloroform + Methyl tert-Butyl Ether]

Abstract

Density and viscosity measurements in the T = (273.15 to 318.15) K range of pure chloroform and methyl tert-butyl ether (MTBE), as well as of the binary system [x 1 chloroform + (1 − x 1) MTBE] over the whole concentration range at T = 293.15 K, were made. The experimental results for the pure components were fitted to empirical equations, which permit the calculation of these properties in the studied temperature range. Calculated values are in agreement with the experimental ones. Data of the binary mixture were further used to calculate the excess molar volume and viscosity deviations. The excess molar enthalpy at T = (303 ± 1) K and vapor−liquid equilibrium measurements at T = (303.15 ± 0.05) K were also measured for the binary system. These last experimental results were used to calculate activity coefficients, the excess molar Gibbs energy, and excess molar entropy. This binary system shows strong negative deviations from ideality and exhibits a minimum pressure azeotrope, whose coordinates are: P = (26.30 ± 0.05) kPa and x 1 = (0.586 ± 0.002). Excess or deviation properties were fitted to the Redlich−Kister polynomial relation to obtain their coefficients and standard deviations. The vapor pressure of pure MTBE over the P = [(20.00 to 97.20) ± 0.05] kPa range was also measured.

Density, Viscosity, Vapor-Liquid Equilibrium, Excess Molar Enthalpy and IR Spectrocopy of [Chloroform+Di-isopropyl Ether (DIPE)]

“…Density and viscosity were simultaneously measured with an Anton Paar Stabinger viscometer (SVM 3000/G2) [6] calibrated by the manufacturer. This instrument is equipped with its own Peltier effect control system, which maintains temperature at ±0.01 K. The uncertainties in this work were ±0.3% of the measured viscosity value, ±0.1 kg⋅m -3 for density, and ±0.01 K for temperature.…”

“…Vapor pressure data were obtained with a commercial equipment (Labodest, model 602-S) available from Fischer Technology, Germany [6]. The observed uncertainties are: ±0.05 K for temperature and ±0.05 kPa for pressure.…”

Ultrasonic Speed and Related Thermo-acoustical Parameters of Solutions of 1,1′-Bis(3-methyl-4-ethoxyacetylphenoxy)cyclohexane at Four Different Temperatures

“…From the stock solutions a series of dilute solutions (0.1-0.01 molÁdm -3 ) were prepared in air-tight measuring flasks. The q, g and U data of pure solvents along with literature values [24][25][26][27][28][29][30][31][32][33][34] are reported in Table 1.…”

Thermo-Acoustical Study of Biologically Active 1,1’-Bis(3-Methyl-4-Carboxyethylphenoxy) Cyclohexane at Four Different Temperatures

“…Ltd. Mumbai and were purified according to literature methods [18]. The density (ρ), viscosity (η) and ultrasonic speed (U) of pure solvents were compared with the literature values [19][20][21][22][23][24][25][26][27][28][29] and are shown in Table 1.…”