Prediction of vapor pressure and heats of vaporization of edible oil/fat compounds by group contribution

2013 ◽  
Vol 337 ◽  
pp. 53-59 ◽  
Author(s):  
Roberta Ceriani ◽  
Rafiqul Gani ◽  
Y.A. Liu
Keyword(s):  
Vapor Pressure ◽  
Edible Oil ◽  
Group Contribution ◽  
Heats Of Vaporization

scholarly journals Critical Comments on “Assessment of the Thermodynamic Properties of DL-p-Mentha-1,8-diene, 4-Isopropyl-1-Methylcyclohexene (DL-Limonene) by Inverse Gas Chromatography (IGC)”

2020 ◽  
Vol 58 (5) ◽  
pp. 401-402
Author(s):  
William E Acree
Keyword(s):  
Gas Chromatography ◽  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Inverse Gas Chromatography ◽  
Thermodynamic Quantities ◽  
Pressure Measurements ◽  
Probe Molecules ◽  
Vapor Pressure Measurements ◽  
Published Paper ◽  
Heats Of Vaporization

Abstract A polemic is given regarding the calculated thermodynamic quantities reported in the published paper by Farschi and coworkers. The graph used to calculate the molar heat of sorption of organic probe molecules onto the liquid DL-limonene stationary phase erroneously plots the reciprocal of the centigrade temperatures, rather than the reciprocal of the Kelvin temperatures. Molar heats of vaporization of the organic probe molecules reported in the paper are abnormally small and are not in accord with published values determined from calorimetric and vapor pressure measurements.

Estimation of heats of vaporization for non associating organic liquids from the boiling points at various pressures

1986 ◽  
Vol 64 (4) ◽  
pp. 635-640 ◽  
Author(s):  
J. Peter Guthrie
Keyword(s):  
Heat Capacity ◽  
Vapor Pressure ◽  
Boiling Point ◽  
Room Temperature ◽  
Quadratic Function ◽  
Organic Liquids ◽  
Heat Of Vaporization ◽  
Boiling Points ◽  
Temperature And Pressure ◽  
Heats Of Vaporization

At any pressure the heat of vaporization can be expressed as a quadratic function of the boiling point at that pressure. A seven parameter equation expressing the simultaneous dependence on boiling point and pressure can be fitted to the data; six pressures from 1 to 760 Torr (1 Torr = 133.3 Pa) were used. ΔHvap = b11 + b12 In (p) + b13p + (b21 + b22 In (p))tbp + (b31 + b32 In (p))tbp2. This relationship served as a guide for developing a relationship between vapour pressure at 25 °C and the calorimetric heat of vaporization, and also a relationship between vapor pressure at 25 °C and the boiling point at some other pressure. Parameters for both these relationships could be derived from the parameters obtained for ΔHvap as a function of temperature and pressure. A third method was developed starting from an equation for vapor pressure and fitting to the heat of vaporization, the heat capacity of vaporization, and at least one t,p point. These methods allow the estimation of the vapor pressure at room temperature from very meager data. The problems of errors in estimated values are discussed.

Determination of Vapor Pressure of Chemical Compounds: A Group Contribution Model for an Extremely Large Database

2012 ◽  
Vol 51 (20) ◽  
pp. 7119-7125 ◽  
Author(s):  
Farhad Gharagheizi ◽  
Ali Eslamimanesh ◽  
Poorandokht Ilani-Kashkouli ◽  
Amir H. Mohammadi ◽  
Dominique Richon
Keyword(s):  
Vapor Pressure ◽  
Chemical Compounds ◽  
Group Contribution ◽  
Large Database ◽  
Group Contribution Model
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