Correlation of measured excess enthalpies of binary systems composed of n-alkane+1-alkanol

Kwon, Cheong Hoon; Kang, Jeong Won

doi:10.1007/s11814-009-0040-y

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…Other comparisons could not be made as the calculation of H̅ i E∞ from eq requires four measured points per system per dilute region for a suitable extrapolation. Furthermore, a thorough literature search was also conducted for directly measured excess enthalpy data of sufficient dilution for the systems and conditions considered in this work. − This data was unfortunately unavailable at sufficient dilution in the literature for comparison.…”

Section: Results and Discussionmentioning

confidence: 99%

Infinite Dilution Activity Coefficients for Systems of C2–C4 n-Alcohols in the Range of T = (303.15 to 343.15) K

Moodley

Raal

2020

J. Chem. Eng. Data

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In this work vapor pressures and activity coefficients at infinite dilution (γ i ∞) were measured using a newly commissioned ebulliometer (a noninvasive phase equilibrium measurement device), that has been modified with the view to improve the precision and measurement time of the apparatus, as well as the effects of superheating. The systems considered were C2–C4 n-alcohols with three different classes of solvents (ester, n-alkane, ketone), namely, (ethanol/propan-1-ol/butan-1-ol) + (ethyl acetate, n-octane, butan-2-one). The temperature range considered was T = (303.15 to 343.15) K, which corresponded to subatmospheric conditions. The γ i ∞ data were correlated empirically for temperature using standard procedures. A portion of the γ i ∞ data measured are available in the literature and compared well with an acceptable correlation for this type of data, for the majority of the systems considered. The data were also compared to extrapolations of γ i ∞ from reliable vapor–liquid equilibrium data. Vapor–liquid equilibrium predictions were also made from the limiting activity coefficients and established that the presence of azeotropes and their temperature dependence were correlated from the measured γ i ∞.

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Section: Results and Discussionmentioning

confidence: 99%

Infinite Dilution Activity Coefficients for Systems of C2–C4 n-Alcohols in the Range of T = (303.15 to 343.15) K

Moodley

Raal

2020

J. Chem. Eng. Data

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“…Excess enthalpy data for the ethanol (1) + n -decane (2) system at various temperatures. Predicted from VLE model parameters at: ( - ) 313.15 K, (- - -) 328.17, (······) 338.17 K, and () 348.16 K. (○) Experimental data at 313.15 K …”

Section: Resultsmentioning

confidence: 99%

Vapor–Liquid Equilibrium Measurements of Ethanol and n-Nonane or n-Decane Binary Mixtures with Large Relative Volatility

2018

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A specialized still was used for the measurement of vapor–liquid equilibrium (VLE) data by the dynamic-analytic approach at low pressures. The specialized apparatus improves the measurement of VLE in high relative volatility systems. Isothermal measurements were conducted for the ethanol (1) + n-nonane (2) systems at 323.21, 333.21, and 343.21 K and the ethanol (1) + n-decane (2) systems at 328.17, 338.17, and 348.16 K. The experimental data was modeled by the combined approach using the NRTL activity coefficient model for the liquid phase and with the virial equation of state for the vapor phase with the Hayden and O’Connell correlation. The experimental data was fitted by minimizing the pressure residual. UNIFAC predictions were also conducted, and there was significant discrepancy between experimental and predicted data, highlighting the importance of precise experimental data in these types of systems. Thermodynamic consistency tests showed all data to be consistent.

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“…Christensen et al 13 conducted measurements of H m E of {x ethanol + (1 À x) nonane} at 298.15 K and 170 kPa. Savini et al 14 report experimental data for this mixture at 303.15 K and 318.15 K, and Kwon et al 15 published experimental data at 313.15 K.…”

Section: ' Introductionmentioning

confidence: 93%

Excess Molar Enthalpies of Ternary and Binary Mixtures Containing 2-Methoxy-2-Methylpropane, Ethanol, and Nonane

et al. 2011

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This paper contributes to the series of ternary mixtures reported in earlier works, 1À12 where excess molar enthalpies of binary and ternary mixtures containing as components 2-methoxy-2-methylpropane (MTBE), alkanols, and alkanes, used as oxygenating agents in gasoline technology, were studied. All of them are part of the scientific project entitled "Study on Physical Properties of Mixtures Hydrocarbon + Alcohol + Ether Like Alternative Fuels", whose main objective has been the characterization of nonelectrolyte liquids and their mixtures, through experimental determination of thermophysical properties on mixing.In this framework, the excess molar enthalpy determination is considered of primary interest from a thermodynamic point of view, as this property is essential in characterizing the mixing process. The sign, magnitude, and symmetry of this quantity is a direct result of bond breaking and rearranging during the mixing process, and any effect arising from energetic interactions between both like and unlike molecules will be directly reflected in the enthalpy data and their representations, which is essential when studying new theoretical approaches to the liquid state of matter and its mixtures. From a theoretical point of view, mixtures of alkanols and ethers are of interest due to their complexity, consequently on the self-association of the alcohols, which is partially destroyed by the active ether molecules, and on the new intermolecular OHÀO bonds created. The complexity is increased when the mixture also contains one or more alkanes.Following the above considerations, it is desirable to know the thermodynamic properties of binary and ternary mixtures formed by MTBE, hydrocarbons, and alkanols. Our group has reported thermodynamic properties of various similar mixtures; 1À12 the study is now continued considering ethanol as second component and nonane as the third component in the present work. This should help to study the effect of alkane chain length in the binary mixtures involved and subsequent effects on the ternary mixture.So, the aim of this investigation was to measure, using a Calvet microcalorimeter, experimental excess molar enthalpies, over the whole composition range, for the ternary system {x 1 MTBE + x 2 ethanol + (1 À x 1 À x 2 ) nonane} and the involved binary mixture {x ethanol + (1 À x) nonane} at the temperature of 298.15 K and atmospheric pressure. The binary experimental data for the mixtures {x MTBE + (1 À x) ethanol} and {x MTBE + (1 À x) nonane} were reported in previous works. 12,10 The results were fitted by means of polynomials of different variable degrees.The literature referring to the binary systems {x 1-alkanol + (1 À x) alkane} is very large. Christensen et al. 13 conducted measurements of H m E of {x ethanol + (1 À x) nonane} at 298.15 K and 170 kPa. Savini et al. 14 report experimental data for this mixture at 303.15 K and 318.15 K, and Kwon et al. 15 published experimental data at 313.15 K.The only experimental data of excess molar enthalpy, related to ternary mix...

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Correlation of measured excess enthalpies of binary systems composed of n-alkane+1-alkanol

Cited by 7 publications

References 13 publications

Infinite Dilution Activity Coefficients for Systems of C2–C4 n-Alcohols in the Range of T = (303.15 to 343.15) K

Infinite Dilution Activity Coefficients for Systems of C2–C4 n-Alcohols in the Range of T = (303.15 to 343.15) K

Vapor–Liquid Equilibrium Measurements of Ethanol and n-Nonane or n-Decane Binary Mixtures with Large Relative Volatility

Excess Molar Enthalpies of Ternary and Binary Mixtures Containing 2-Methoxy-2-Methylpropane, Ethanol, and Nonane

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