Heat Capacity, Density, Vapor Pressure, and Enthalpy of Vaporization of Isoamyl dl-Lactate

2019 ◽  
Vol 64 (9) ◽  
pp. 3793-3798 ◽  
Author(s):  
Jumei Xu ◽  
Shating Li ◽  
Zuoxiang Zeng ◽  
Weilan Xue
Keyword(s):  
Heat Capacity ◽  
Vapor Pressure ◽  
Enthalpy Of Vaporization

scholarly journals Thermophysical Properties of the Lennard-Jones Fluid: Database and Data Assessment

2021 ◽  
Author(s):  
Simon Stephan ◽  
Monika Thol ◽  
Jadran Vrabec ◽  
Hans Hasse
Keyword(s):  
Heat Capacity ◽  
Vapor Pressure ◽  
Enthalpy Of Vaporization ◽  
Data Sets ◽  
Saturated Liquid ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Lennard Jones ◽  
Equilibrium Data ◽  
Vapor Liquid

Literature data on the thermophysical properties of the Lennard-Jones fluid, which were sampled with molecular dynamics and Monte Carlo simulations, were reviewed and assessed. The literature data were complemented by simulation data from the present work that were taken in regions in which previously only sparse data were available. Data on homogeneous state points (for given temperature T and density ρ: pressure p, thermal expansion coefficient α, isothermal compressibility β, thermal pressure coefficient γ, internal energy u, isochoric heat capacity cv, isobaric heat capacity cp, Grüneisen parameter Γ, Joule–Thomson coefficient μJT, speed of sound w, Helmholtz energy a, and chemical potential) were considered, as well as data on the vapor–liquid equilibrium (for given T: vapor pressure ps, saturated liquid and vapor densities ρ′ and ρ″, respectively, enthalpy of vaporization Δhv, and as well as surface tension γ). The entire set of available data, which contains about 35 000 data points, was digitalized and included in a database, which is made available in the Supporting Information of this paper. Different consistency tests were applied to assess the accuracy and precision of the data. The data on homogeneous states were evaluated pointwise using data from their respective vicinity and equations of state. Approximately 10% of all homogeneous bulk data were discarded as outliers. The vapor–liquid equilibrium data were assessed by tests based on the compressibility factor, the Clausius–Clapeyron equation, and by an outlier test. Seven particularly reliable vapor–liquid equilibrium data sets were identified. The mutual agreement of these data sets is approximately ±1% for the vapor pressure, ±0.2% for the saturated liquid density, ±1% for the saturated vapor density, and ±0.75% for the enthalpy of vaporization—excluding the region close to the critical point.

scholarly journals Enthalpy Relaxation Phenomenon in a Heavy Ice Crystal

1978 ◽  
Vol 21 (85) ◽  
pp. 707
Author(s):  
Osamu Haida ◽  
Hiroshi Suga ◽  
Syūzō Seki
Keyword(s):  
Heat Capacity ◽  
Activation Enthalpy ◽  
Thermal Anomaly ◽  
Adiabatic Calorimeter ◽  
Enthalpy Of Vaporization ◽  
Ice Crystal ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
Relaxational Process ◽  
Capacity Data

Abstract The heat capacities of quenched and annealed heavy ice Ih were measured in the temperature range 14 to 300 K by an adiabatic calorimeter. A relaxational thermal anomaly was found at around 115 K and this phenomenon was ascribed to the onset of deuteron ordering in the crystal. The average activation enthalpy of the relaxational process was determined to be (26±5) kJ mol-1. Residual entropies of the crystal were recalculated on the basis of the present heat-capacity data combined with the revised values for enthalpy of vaporization, saturated vapour pressure, and spectroscopic entropy. They are (3.47±0.41 J K-1 mol-1 for the quenched crystal and (3.44±0.41) J K-1 mol-1 for a crystal annealed at 102-106 K for 264 h. The characteristics and the origin of the anomaly are discussed in comparison with that of ordinary ice. This paper has been accepted for publication in full in a forthcoming issue of the Journal of Glaciology.

Vapor Pressure and Enthalpy of Vaporization of 2-Amino-3-methylpyridine

2007 ◽  
Vol 52 (6) ◽  
pp. 2431-2435 ◽  
Author(s):  
Xiong-Jun Yuan ◽  
Wei-Lan Xue ◽  
Zuo-Xiang Zeng ◽  
Tong Pu
Keyword(s):  
Vapor Pressure ◽  
Enthalpy Of Vaporization
Sign in / Sign up

Export Citation Format

Share Document