Thermodynamic properties of aqueous mixtures of hydrophilic compounds 2. Aminoethanol and its methyl derivatives

H. Touhara, S. Okazaki, F. Okino, Hideki Tanaka, K. Ikari, K. Nakanishi

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Abstract

The vapour pressures of water + 2-aminoethanol, + N-methyl-2-aminoethanol, and + N,N-dimethyl-2-aminoethanol at 298.15 and 308.15 K were measured over the whole composition range by a static method. The excess enthalpies and densities of the same mixtures at 298.15 K were also measured with an isothermal displacement calorimeter and a pyknometer. The thermodynamic excess functions: GE, HE, TSE, and VE were calculated. Except for aminoethanol-rich region in (water + N,N-dimethyl-2-aminoethanol), where GE is slightly positive, the signs and relative magnitudes of molar excess functions were 0 > GE>TSE>HE, VE <0. These are in accordance with general characteristics of (water + a highly hydrophilic compound). However, hydrophobicity is clearly seen for dilute aqueous solutions where the partial molar volume of aminoethanol exhibits a minimum and the partial molar enthalpy decreases rapidly to a limiting value at infinite dilution. This tendency increases with the introduction of methyl groups into 2-aminoethanol.

Original languageEnglish
Pages (from-to)145-156
Number of pages12
JournalThe Journal of Chemical Thermodynamics
Volume14
Issue number2
DOIs
Publication statusPublished - 1982
Externally publishedYes

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Ethanolamines
Ethanolamine
Thermodynamic properties
thermodynamic properties
Derivatives
Enthalpy
enthalpy
water
Water
Hydrophobicity
hydrophobicity
Calorimeters
Vapor pressure
Density (specific gravity)
vapor pressure
Dilution
calorimeters
dilution
tendencies
Thermodynamics

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Thermodynamic properties of aqueous mixtures of hydrophilic compounds 2. Aminoethanol and its methyl derivatives. / Touhara, H.; Okazaki, S.; Okino, F.; Tanaka, Hideki; Ikari, K.; Nakanishi, K.

In: The Journal of Chemical Thermodynamics, Vol. 14, No. 2, 1982, p. 145-156.

Research output: Contribution to journalArticle

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AU - Okazaki, S.

AU - Okino, F.

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AU - Ikari, K.

AU - Nakanishi, K.

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N2 - The vapour pressures of water + 2-aminoethanol, + N-methyl-2-aminoethanol, and + N,N-dimethyl-2-aminoethanol at 298.15 and 308.15 K were measured over the whole composition range by a static method. The excess enthalpies and densities of the same mixtures at 298.15 K were also measured with an isothermal displacement calorimeter and a pyknometer. The thermodynamic excess functions: GE, HE, TSE, and VE were calculated. Except for aminoethanol-rich region in (water + N,N-dimethyl-2-aminoethanol), where GE is slightly positive, the signs and relative magnitudes of molar excess functions were 0 > GE>TSE>HE, VE <0. These are in accordance with general characteristics of (water + a highly hydrophilic compound). However, hydrophobicity is clearly seen for dilute aqueous solutions where the partial molar volume of aminoethanol exhibits a minimum and the partial molar enthalpy decreases rapidly to a limiting value at infinite dilution. This tendency increases with the introduction of methyl groups into 2-aminoethanol.

AB - The vapour pressures of water + 2-aminoethanol, + N-methyl-2-aminoethanol, and + N,N-dimethyl-2-aminoethanol at 298.15 and 308.15 K were measured over the whole composition range by a static method. The excess enthalpies and densities of the same mixtures at 298.15 K were also measured with an isothermal displacement calorimeter and a pyknometer. The thermodynamic excess functions: GE, HE, TSE, and VE were calculated. Except for aminoethanol-rich region in (water + N,N-dimethyl-2-aminoethanol), where GE is slightly positive, the signs and relative magnitudes of molar excess functions were 0 > GE>TSE>HE, VE <0. These are in accordance with general characteristics of (water + a highly hydrophilic compound). However, hydrophobicity is clearly seen for dilute aqueous solutions where the partial molar volume of aminoethanol exhibits a minimum and the partial molar enthalpy decreases rapidly to a limiting value at infinite dilution. This tendency increases with the introduction of methyl groups into 2-aminoethanol.

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