Studies on Associated Solutions. II. Heat of Mixing of Methanol with Aliphatic Amines

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概要

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• The heat of mixing has been measured at 25.00°C and 45.00°C for binary mixtures of methanol with <I>n</I>-butylamine, diethylamine and triethylamine. A twin-type conduction calorimeter was used. All the systems exhibit large negative enthalpies of mixing, which become slightly less negative as the temperature increases. From the present results and vapor-liquid equilibrium data, the excess free energy and entropy of mixing at 25.00°C have been calculated for each system. The sign and magnitude of the excess functions were as follows: <I>H<SUP>M</SUP></I><<I>TS<SUP>E</SUP></I><<I>G<SUP>E</SUP></I><0 for methanol with <I>n</I>-butylamine and diethylamine, <I>G<SUP>E</SUP></I>>0, <I>TS<SUP>E</SUP></I><<I>H<SUP>M</SUP></I><0 for methanol with triethylamine. These facts were interpreted in terms of steric effects and specific solvation in the hydrogen bonding between hydroxyl group and amino bases.

• 公益社団法人 日本化学会の論文

著者

• Touhara Hidekazu

  Department Of Chemistry Shinshu University

• Nakanishi Koichiro

  Department of Industrial Chemistry Faculty of Engineering Kyoto University

• Watanabe Nobuatsu

  Department of Industrial Chemistry, Faculty of Engineering, Kyoto University

• Watanabe Nobuatsu

  Department of Industrial Chemistry, Kyoto University

• Nakanishi Koichiro

  Department of Industrial Chemistry, Kyoto University

• Touhara Hidekazu

  Department of Industrial Chemistry, Kyoto University

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