(Vapour  +  liquid) equilibria and excess molar enthalpies for mixtures with strong complex formation. Trichloromethane or 1-bromo-1-chloro-2,2,2-trifluoroethane (halothane) with tetrahydropyran or piperidine
✍ Scribed by Dana Fenclová; Pavel Vrbka; Vladimı́r Dohnal; Karel Řehák; Gonzalo Garcı́a-Miaja
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 275 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0021-9614
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✦ Synopsis
Isothermal (vapour + liquid) equilibria were measured for (trichloromethane + tetrahydropyran or piperidine) at T = 333.15 K and {1-bromo-1-chloro-2,2,2-trifluoroethane (halothane) + tetrahydropyran or piperidine} at T = 323.15 K with a circulation still. The results were verified by effective statistical procedures and used to calculate activity coefficients and excess molar Gibbs free energies G E m . Excess molar enthalpies H E m for these mixtures were determined at T = 298.15 K by means of an isothermal CSC microcalorimeter equipped with recently reconstructed flow mixing cells. Reliable performance of the calorimetric setup was proved by the good agreement of H E m for (hexane + cyclohexane), (2-propanone + water), and (methanol + water), with the best literature results. The trichloromethane-or halothane-containing mixtures exhibit strong negative deviations from Raoult's law and are highly exothermic, thus indicating that complex formation via hydrogen bonding is a governing nonideality effect. A close similarity in the behaviour of corresponding mixtures with trichloromethane and halothane is observed, but for halothane-containing mixtures, G E m and H E m are consistently more negative, confirming that halothane is a more powerful proton donor than chloroform.