Comparison between the transfer enthalpies of esters from cyclohexane towards ethanol and water

Huyskens, P.; Vanderheyden, L.

doi:10.1016/0378-3812(89)80021-4

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…As seen from Table , only some of our results for esters can be compared to data reported in the literature; no comparison is however possible for the other two solutes as they have not been previously studied. Our values of partial molar volumes of propyl acetate at infinite dilution in water are in excellent agreement with those of Sakurai et al over the entire temperature range examined, as well as with a single value of Segatin and Klofutar at 298.15 K. The value of infinite dilution dissolution enthalpy of propyl acetate in water at 298.5 K reported by Huyskens and Vanderheyden is slightly less exothermic than the value of ours, but the difference is fully within a somewhat larger uncertainty of the literature value. A comparison of our values of H̅ 1 E,∞ for methyl butyrate to existing literature data in Table shows perfect agreement with those of Nilsson and Wadsö over the entire examined temperature range, but the value at 298.15 K reported by Della Gatta et al is about 4 % less exothermic than the present value, the difference exceeding the combined uncertainty limits.…”

Section: Resultssupporting

confidence: 91%

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Thermal and Volumetric Properties of Four Aqueous Aroma Compounds at Infinite Dilution

Dohnal

Řehák

2012

J. Chem. Eng. Data

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Mixing enthalpies and densities of highly dilute aqueous solutions of four aroma compounds (propyl acetate, methyl butyrate, 2,3butanedione, and cis-3-hexen-1-ol) were measured as a function of solution composition at several temperatures in the range from (288.15 to 318.15) K using a recently described tandem flow arrangement of isothermal mixing microcalorimeter and vibrating-tube densimeter. The dissolution of all of the aroma compounds in water is strongly exothermic and accompanied with volume contraction. Based on the measured data, reliable values of infinite dilution partial molar excess enthalpy H̅ 1 E,∞ , partial molar volume V̅ 1 ∞ , and partial molar excess volume V̅ 1 E,∞ of the studied solutes at infinite dilution in water were determined. A comparison to literature data is possible only for some of our results for esters and indicates excellent agreement. Thanks to the high precision of our measurements, the temperature derivative properties, that is, infinite dilution partial molar excess heat capacity and expansivity, could be evaluated also with a good accuracy. In addition, whenever necessary pure component data were available, enthalpies and heat capacities of hydration for the aroma compounds were calculated, too. The observed thermodynamic behavior for aqueous aroma solutes was briefly discussed in terms of molecular interactions.

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Section: Resultssupporting

confidence: 91%

“…The thermodynamic properties for aqueous 2,3-butanedione and cis -3-hexen-1-ol are not available and have been studied here for the first time. Some results obtained here for the esters can be compared to existing literature data. − …”

Section: Introductionmentioning

confidence: 66%

Thermal and Volumetric Properties of Four Aqueous Aroma Compounds at Infinite Dilution

Dohnal

Řehák

2012

J. Chem. Eng. Data

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“…In this work we present a quantitative treatment of this competitive effect, along the lines of the previous developments [4,5]. This treatment is more general than the simplified version we used elsewhere [9]. It leads to the prediction of the molar heat of transfer of proton acceptors from an inert solvent to an H bonded solvent, when effects other than those arising from H bonding can be neglected.…”

Section: The Competition Between H Bondsmentioning

confidence: 99%

Competition between Solute‐Solvent and Solvent‐Solvent Hydrogen Bonds: Pyridines in Alcohols and in Water

Siegel

Huyskens

Vanderheyden

1990

Ber Bunsenges Phys Chem

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Calorimetry / Mobile OrderPartial enthalpies of mixing of pyridines in methanol, ethanol, I-butanol, water and cyclohexane were determined calorimetrically at 25°C. From these data their molar enthalpies of transfer, at infinite dilution, from the inert solvent to the H bonded solvents were calculated. They were compared with the enthalpies of H bond formation between the pyridines and the alcohols in CC14 and the enthalpies of the selfassociation bonds in the pure liquids. Although in the pure alcohols more than 95% of the molecules are at a given time involved in H bonds with an energy of about 25 kJmol-' which is markedly larger than the energy of the pyridine-alcohol bonds in CCI,, the molar enthalpy of transfer of the pyridines from an inert solvent to an H bonded one remains exothermic. A quptitative treatment of the competition between the two types of H-bonds is presented. It is based on the thermodynamics of mobile order that was recently developed. It leads to an equation that reasonably predicts the transfer enthalpies. According to this treatment the competition reduces the complexation constant by a factor KjB/(KiBKiA), K i B and K i A being the stability constants of the H bonds in the absence of competition. In water the exothermic effect is enhanced because the second 0 -H group of the molecule forms much weaker selfassociation H-bonds than the first one.Solutions / Thermodynamics

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“…The system n-heptane + 2,2,4-trimethylpentane, as in general the mixtures of normal alkanes with comparatively rigid branched alkane molecules, is expected to show some interesting properties, as revealed for instance by abnormally high excess properties [IS] and by a typical composition dependence of the binary diffusivity [9]. It is also remarkable that the thermal conductivities of pure liquid n-alkanes and their branched isomers show surprisingly large differences when compared to the corresponding differences of other properties like the viscosity, the heat capacity, or the vapour pressure [4,10,11].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Thermal Conductivity of Liquid Alkane Mixtures

Fareleira¹,

Castro²,

Pádua³

1990

Ber Bunsenges Phys Chem

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Alkane Mixtures f Liquids f Mixing Rules f Prediction / Thermal ConductivityThe paper is devoted to the study of the applicability to binary mixtures of an extension of the van der Waals model for the description of the thermal conductivity of pure liquid alkanes. This study is based upon recently obtained accurate data for the binary mixtures methane + ethane and n-heptane + 2,2,4-trimethylpentane. -A reduced thermal conductivity for the mixtures is defined such that its density dependence is identical to that of the pure components. -Furthermore, a scheme is developed that enables the prediction of the thermal conductivity of the mixtures at any temperature 7 ' I 0.7 T,, and any pressure, solely from data for the pure components, i.e. without resort to any experimentally adjusted parameters for the mixtures. Such scheme is able to reproduce the available thermal conductivity data for the above mentioned systems with an error of the order of *2% at a 2a level (a being the standard deviation), which is commensurate with the combined uncertainty of the experimental results for the pure components and for the mixtures.

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Comparison between the transfer enthalpies of esters from cyclohexane towards ethanol and water

Cited by 9 publications

References 3 publications

Thermal and Volumetric Properties of Four Aqueous Aroma Compounds at Infinite Dilution

Thermal and Volumetric Properties of Four Aqueous Aroma Compounds at Infinite Dilution

Competition between Solute‐Solvent and Solvent‐Solvent Hydrogen Bonds: Pyridines in Alcohols and in Water

Prediction of the Thermal Conductivity of Liquid Alkane Mixtures

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