Excess Gibbs energy of methanol + propionic acid and of methanol + butyric acid

Alexander Apelblat; Friedrich Kohler

doi:10.1016/0021-9614(76)90054-9

Excess Gibbs energy of methanol + propionic acid and of methanol + butyric acid

Alexander Apelblat, Friedrich Kohler

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30 Scopus citations

Abstract

Total vapour pressures have been measured by the isoteniscope method for methanol + propionic acid and methanol + butyric acid between 298 and 318 K. From these, activity coefficients were derived by numerical integration of the Gibbs-Duhem equation, taking into account the monomer-dimer equilibrium of the carboxylic acids in the vapour phase. The resulting excess Gibbs energies are negative (minimum value -84 J mol^-1 in the case of the propionic acid system, -50 J mol^-1 in the case of the butyric acid system at 300 K) on the methanol side, and positive (maximum value 92 J mol^-1 in the case of the propionic acid system, 146 J mol^-1 in the case of the butyric acid system at 300 K) on the carboxylic acid side.

Original language	English
Pages (from-to)	749-756
Number of pages	8
Journal	Journal of Chemical Thermodynamics
Volume	8
Issue number	8
DOIs	https://doi.org/10.1016/0021-9614(76)90054-9
State	Published - 1 Jan 1976
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Materials Science
Physical and Theoretical Chemistry

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10.1016/0021-9614(76)90054-9

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title = "Excess Gibbs energy of methanol + propionic acid and of methanol + butyric acid",

abstract = "Total vapour pressures have been measured by the isoteniscope method for methanol + propionic acid and methanol + butyric acid between 298 and 318 K. From these, activity coefficients were derived by numerical integration of the Gibbs-Duhem equation, taking into account the monomer-dimer equilibrium of the carboxylic acids in the vapour phase. The resulting excess Gibbs energies are negative (minimum value -84 J mol-1 in the case of the propionic acid system, -50 J mol-1 in the case of the butyric acid system at 300 K) on the methanol side, and positive (maximum value 92 J mol-1 in the case of the propionic acid system, 146 J mol-1 in the case of the butyric acid system at 300 K) on the carboxylic acid side.",

author = "Alexander Apelblat and Friedrich Kohler",

note = "Funding Information: Atomic Energy Commission, Nuclear Research Centre-Negev, P.O.B. 9001, Beer-Sheva, Israel",

year = "1976",

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doi = "10.1016/0021-9614(76)90054-9",

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T1 - Excess Gibbs energy of methanol + propionic acid and of methanol + butyric acid

AU - Apelblat, Alexander

AU - Kohler, Friedrich

N1 - Funding Information: Atomic Energy Commission, Nuclear Research Centre-Negev, P.O.B. 9001, Beer-Sheva, Israel

PY - 1976/1/1

Y1 - 1976/1/1

N2 - Total vapour pressures have been measured by the isoteniscope method for methanol + propionic acid and methanol + butyric acid between 298 and 318 K. From these, activity coefficients were derived by numerical integration of the Gibbs-Duhem equation, taking into account the monomer-dimer equilibrium of the carboxylic acids in the vapour phase. The resulting excess Gibbs energies are negative (minimum value -84 J mol-1 in the case of the propionic acid system, -50 J mol-1 in the case of the butyric acid system at 300 K) on the methanol side, and positive (maximum value 92 J mol-1 in the case of the propionic acid system, 146 J mol-1 in the case of the butyric acid system at 300 K) on the carboxylic acid side.

AB - Total vapour pressures have been measured by the isoteniscope method for methanol + propionic acid and methanol + butyric acid between 298 and 318 K. From these, activity coefficients were derived by numerical integration of the Gibbs-Duhem equation, taking into account the monomer-dimer equilibrium of the carboxylic acids in the vapour phase. The resulting excess Gibbs energies are negative (minimum value -84 J mol-1 in the case of the propionic acid system, -50 J mol-1 in the case of the butyric acid system at 300 K) on the methanol side, and positive (maximum value 92 J mol-1 in the case of the propionic acid system, 146 J mol-1 in the case of the butyric acid system at 300 K) on the carboxylic acid side.

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JO - Journal of Chemical Thermodynamics

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ER -

Excess Gibbs energy of methanol + propionic acid and of methanol + butyric acid

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