DSC enthalpy of vaporization measurements of high temperature two-phase working fluids

Back, Dwight D.; Grzyll, Lawrence R.; Corrigan, Mary Beth

doi:10.1016/0040-6031(95)02615-0

Cited by 20 publications

(11 citation statements)

References 2 publications

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“…The enthalpy of vaporization is a characteristic parameter of a substance that reflects the amount of heat energy required to vaporize one mole of the substance. The Clausius-Clapeyron equation given below has been extensively used 10 to study the dependency of vapor pressure of liquids over temperature.…”

Section: Antoine and Langmuir Equationsmentioning

confidence: 99%

A thermogravimetric analysis of non-polymeric pharmaceutical plasticizers: Kinetic analysis, method validation, and thermal stability evaluation

Tatavarti

Dollimore

Alexander

2002

AAPS J

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Four non-polymeric plasticizers, propylene glycol, diethyl phthalate, triacetin, and glycerin have been subjected to rising temperature thermogravimetry for kinetic analysis and vaporization-based thermal stability evaluation. Since volatile loss of a substance is a function of its vapor pressure, the thermal stability of these plasticizers has been analyzed by generating vapor pressure curves using the Antoine and Langmuir equations. Unknown Antoine constants for the sample compounds, triacetin and glycerin have been derived by subjecting the vapor pressure curves to nonlinear regression. For the first time, the entire process of obtaining the unknown Antoine constants through thermogravimetry has been validated by developing an approach called the 'double reference method.' Based on this method, it has been possible to show that this technique is accurate even for structurally diverse compounds. Kinetic analysis on the volatilization of compounds revealed a predominant zero order process. The activation energy values for vaporization of propylene glycol, diethyl phthalate, triacetin, and glycerin, as deduced from the Arrhenius plots, have been determined to be 55.80, 66.45, 65.12, and 67.54 kJ/mol, respectively. The enthalpies of vaporization of the compounds have been determined from the Clausius-Clapeyron plots. Rising temperature thermogravimetry coupled with nonlinear regression analysis has been shown to be an effective and rapid technique for accurately predicting the vapor pressure behavior and thermal stability evaluation of volatile compounds.

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Section: Antoine and Langmuir Equationsmentioning

confidence: 99%

A thermogravimetric analysis of non-polymeric pharmaceutical plasticizers: Kinetic analysis, method validation, and thermal stability evaluation

Tatavarti

Dollimore

Alexander

2002

AAPS J

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“…These compounds are attractive for these applications because of their high resistance to pyrolysis and their low volatility. In order to design two-phase thermal control components that use these fluids, the density, viscosity, surface tension, and other thermodynamic properties (Back et al, 1996) of these compounds had to be determined in the temperature range of interest. We report here new experimental measurements of the liquid density, liquid viscosity, and surface tension at saturation conditions using techniques that allow for measurement above and below the normal boiling point of the fluid.…”

Section: Introductionmentioning

confidence: 99%

Density, Viscosity, and Surface Tension of Liquid Quinoline, Naphthalene, Biphenyl, Decafluorobiphenyl, and 1,2-Diphenylbenzene from 300 to 400 °C

1996

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“…The table also lists the data for the melting endothermic onset and heat of fusion. This thermal information for bioantioxidants was used to calculate the solute and solvent equilibrium characteristics [19,20].…”

Section: Thermal Properties Analysismentioning

confidence: 99%

Solubility prediction of bioantioxidants for functional solvent by group contribution method

Park

Lee

Hong

2010

Journal of Industrial and Engineering Chemistry

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DSC enthalpy of vaporization measurements of high temperature two-phase working fluids

Cited by 20 publications

References 2 publications

A thermogravimetric analysis of non-polymeric pharmaceutical plasticizers: Kinetic analysis, method validation, and thermal stability evaluation

A thermogravimetric analysis of non-polymeric pharmaceutical plasticizers: Kinetic analysis, method validation, and thermal stability evaluation

Density, Viscosity, and Surface Tension of Liquid Quinoline, Naphthalene, Biphenyl, Decafluorobiphenyl, and 1,2-Diphenylbenzene from 300 to 400 °C

Solubility prediction of bioantioxidants for functional solvent by group contribution method

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