Excess enthalpy surfaces for n-heptane + carboxylic acid, amylamine and n-octanol mixtures by the nrtl model

Y. Demirel, H. Ö Paksoy

Research output: Contribution to journalArticle

Abstract

The temperature and composition dependences of the excess enthalpy, hE, have been calculated using the nrtl model for mixtures of n-heptane with the hydrogen-bonded liquids of acetic acid, propionic acid, amylamine and n-octanol. Reduced and partial molar excess enthalpies were also calculated. The temperature-dependent parameters of the nrtl model, estimated directly from hE data for more than one isotherm, were used in the calculations. The overall deviations of all the experimental data points fall in the range 0.5-6.5% which shows highly satisfactory correlation of hE data with the model. The temperature range for the mixtures is 285.15-330.15 K. The surfaces of excess enthalpy functions facilitate better understanding of the thermodynamic properties of the hydrogen-bonded mixtures. The nrtl model is a reliable thermodynamic model for studying the hydrogen-bonded mixtures in a qualitative and quantitative manner.

Original languageEnglish (US)
Pages (from-to)33-45
Number of pages13
JournalThermochimica Acta
Volume261
Issue numberC
DOIs
StatePublished - Sep 1 1995

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1-Octanol
Heptane
heptanes
Carboxylic Acids
Carboxylic acids
carboxylic acids
Enthalpy
enthalpy
Hydrogen
hydrogen
propionic acid
Propionic acid
acetic acid
Acetic acid
Acetic Acid
Temperature
Isotherms
isotherms
Thermodynamic properties
thermodynamic properties

Keywords

  • Binary liquid mixtures
  • Excess enthalpy surfaces
  • nrtl model

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Excess enthalpy surfaces for n-heptane + carboxylic acid, amylamine and n-octanol mixtures by the nrtl model. / Demirel, Y.; Paksoy, H. Ö.

In: Thermochimica Acta, Vol. 261, No. C, 01.09.1995, p. 33-45.

Research output: Contribution to journalArticle

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N2 - The temperature and composition dependences of the excess enthalpy, hE, have been calculated using the nrtl model for mixtures of n-heptane with the hydrogen-bonded liquids of acetic acid, propionic acid, amylamine and n-octanol. Reduced and partial molar excess enthalpies were also calculated. The temperature-dependent parameters of the nrtl model, estimated directly from hE data for more than one isotherm, were used in the calculations. The overall deviations of all the experimental data points fall in the range 0.5-6.5% which shows highly satisfactory correlation of hE data with the model. The temperature range for the mixtures is 285.15-330.15 K. The surfaces of excess enthalpy functions facilitate better understanding of the thermodynamic properties of the hydrogen-bonded mixtures. The nrtl model is a reliable thermodynamic model for studying the hydrogen-bonded mixtures in a qualitative and quantitative manner.

AB - The temperature and composition dependences of the excess enthalpy, hE, have been calculated using the nrtl model for mixtures of n-heptane with the hydrogen-bonded liquids of acetic acid, propionic acid, amylamine and n-octanol. Reduced and partial molar excess enthalpies were also calculated. The temperature-dependent parameters of the nrtl model, estimated directly from hE data for more than one isotherm, were used in the calculations. The overall deviations of all the experimental data points fall in the range 0.5-6.5% which shows highly satisfactory correlation of hE data with the model. The temperature range for the mixtures is 285.15-330.15 K. The surfaces of excess enthalpy functions facilitate better understanding of the thermodynamic properties of the hydrogen-bonded mixtures. The nrtl model is a reliable thermodynamic model for studying the hydrogen-bonded mixtures in a qualitative and quantitative manner.

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