Determination of heats of vaporization and some other thermodynamic quantities for three fluorinated halogen ethanes

1981 ◽  
Vol 46 (4) ◽  
pp. 817-822 ◽  
Author(s):  
Vladimír Majer ◽  
Václav Svoboda ◽  
Antonín Pošta ◽  
Jiří Pick
Keyword(s):  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Refractive Indices ◽  
Thermodynamic Quantities ◽  
Saturated Vapour ◽  
Two Temperatures ◽  
Heats Of Vaporization

Some thermodynamic properties were investigated for three fluorinated halogen ethanes: 1-bromo-2-chloro-1,1,2-trifluoroethane, 1,2-dibromotetrafluroethane and 1,2-dibromo-1-chlorotrifluoroethane. The temperature dependence of heats of vaporization, saturated vapour pressures, densities and refractive indices was measured at two temperatures. On the basis of the experimental quantities obtained, the standard heats of vaporization and the cohesive and internal energies of vaporization in their dependence on temperature were determined.

Determination of heats of vaporization and some other thermodynamic quantities for several fluorinated halogen derivatives of ethane and propane

1980 ◽  
Vol 45 (11) ◽  
pp. 3063-3068 ◽  
Author(s):  
Vladimír Majer ◽  
Václav Svoboda ◽  
Antonín Pošta ◽  
Jiří Pick
Keyword(s):  
Chemical Properties ◽  
Thermodynamic Quantities ◽  
Saturated Vapour ◽  
Physico Chemical ◽  
Temperature Dependences ◽  
Two Temperatures ◽  
Cohesive Energies ◽  
Derivatives Of ◽  
Heats Of Vaporization

Some physico-chemical properties were determined for 1,1,1-trichlorotrifluoroethane, 1,1,2-trichlorotrifluoroethane, 1-bromo-1-chloro-2,2,2-trifluoroethane and 1,2-dichlorohexafluoropropane. For all the substances, their heats of vaporization in dependence on temperature were measured and their densities and refractive indices at two temperatures were determined. For 1,1,1-trichlorotrifluoroethane and 1,2-dichlorohexafluoropropane the saturated vapour pressures were measured, too. The temperature dependences of standard heats of vaporization, vaporization internal energies and cohesive energies were determined on the basis of the experimental data.

Determination of heats of vaporization and some other thermodynamic properties for four substituted hydrocarbons

1982 ◽  
Vol 47 (2) ◽  
pp. 543-549 ◽  
Author(s):  
Václav Svoboda ◽  
Vladimíra Charvátová ◽  
Vladimír Majer ◽  
Vladimír Hynek
Keyword(s):  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Constant Pressure ◽  
Pressure Curve ◽  
Saturated Vapour Pressure ◽  
Vapour Pressure Curve ◽  
The Difference ◽  
Cohesive Energies ◽  
Heats Of Vaporization

The temperature dependence of heats of vaporization and some other derived thermodynamic properties were determined for four substituted hydrocarbons, viz. 2,2,4-trimethylpentane,1-octene, ethylbenzene and n-butylbenzene. The temperature dependence of heats of vaporization was measured and, on the basis of these data, the values of standard heats of vaporization, internal and cohesive energies, entropies of vaporization and the difference of heat capacities of liquid and vapour at constant pressure and along the saturated vapour pressure curve were computed.

Determination of heats of vaporization and some other thermodynamic quantities for four alkylcycloparaffins

1981 ◽  
Vol 46 (12) ◽  
pp. 2983-2988 ◽  
Author(s):  
Václav Svoboda ◽  
Vladimíra Charvátová ◽  
Vladimír Majer ◽  
Jiří Pick
Keyword(s):  
Temperature Dependence ◽  
Constant Pressure ◽  
Heat Capacities ◽  
Saturation Line ◽  
Thermodynamic Quantities ◽  
Cohesive Energies ◽  
Heats Of Vaporization

Heats of vaporization and some other related thermodynamic quantities were determined for the four alkylcycloparaffins: ethylcyclopentane, n-butylcyclopentane, ethylcyclohexane and tert-butylcyclohexane. The temperature dependence of heats of vaporization was measured and employed for calculating standard heats of vaporization, internal and cohesive energies of vaporization, entropies of vaporization, and differences between heat capacities of liquids and vapours at constant pressure and along the saturation line of vapours.

Temperature dependence of heats of vaporization, saturated vapour pressures and cohesive energies for a group of amines

1979 ◽  
Vol 44 (12) ◽  
pp. 3521-3528 ◽  
Author(s):  
Vladimír Majer ◽  
Václav Svoboda ◽  
Josef Koubek ◽  
Jiří Pick
Keyword(s):  
Temperature Dependence ◽  
Saturated Vapour ◽  
Temperature Dependences ◽  
Experimental Values ◽  
Cohesive Energies ◽  
Heats Of Vaporization

The temperature dependences of heats of vaporization of propylamine, isopropylamine, butylamine, isobutylamine, sec-butylamine, cyclohexylamine, diethylamine and triethylamine and saturated vapour pressures of butylamine, isobutylamine, sec-butylamine and triethylamine were measured. The cohesive energies of amines studied in dependence on temperature were calculated from the experimental values.

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.

Temperature dependence of heats of vaporization of saturated hydrocarbons C5-C8; Experimental data and an estimation method

1979 ◽  
Vol 44 (3) ◽  
pp. 637-651 ◽  
Author(s):  
Vladimír Majer ◽  
Václav Svoboda ◽  
Slavoj Hála ◽  
Jiří Pick
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Estimation Method ◽  
Saturated Hydrocarbons ◽  
Heat Of Vaporization ◽  
Temperature Range ◽  
Entropy Of Vaporization ◽  
Heats Of Vaporization

Heats of vaporization of a group of 10 alkanes C6-C8 and 2 cycloalkanes were measured in a temperature range of 25-80 °C. By combining the obtained results with selected literature data, a set of very accurate values of heats of vaporization as functions of temperature was made up for 22 saturated C5-C8 hydrocarbons. This set was employed for the verification of the proposed estimation method for the determination of heat of vaporization which is based on the principle of combination of a contribution method with constant entropy-of-vaporization rules. In this way it is then possible to estimate heats of vaporization of C4-C9 alkanes with an error lower than 0.5%.

Temperature dependence of heats of vaporization, saturated vapour pressures and cohesive energies of secondary amines

1979 ◽  
Vol 44 (12) ◽  
pp. 3533-3540 ◽  
Author(s):  
Libor Pětroš ◽  
Vladimír Majer ◽  
Josef Koubek ◽  
Václav Svoboda ◽  
Jiří Pick
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Temperature Dependence ◽  
Secondary Amines ◽  
Saturated Vapour ◽  
Cohesive Energies ◽  
Heats Of Vaporization

The temperature dependence of heats of vaporization of methylisopropylamine, ethylisopropylamine, propylisopropylamine, diisopropylamine, butylisopropylamine, ethylbutylamine and dibutylamine has been measured. Further, the dependence of saturated vapour pressures on temperature has been measured for methylisopropylamine, ethylisopropylamine, propylisopropylamine, butylisopropylamine, diisopropylamine and ethylbutylamine. The densities of the liquid phase at 25°C have been determined for methylisopropylamine, ethylisopropylamine, propylisopropylamine, butylisopropylamine and ethylbutylamine. The cohesive energies at several temperatures have been computed from the experimental data for all the substances of the set.

Temperature dependence of linear electrooptic coefficients r 113 and r 333 in lithium niobate

2008 ◽  
Vol 16 (1) ◽  
Author(s):  
P. Górski ◽  
R. Ledzion ◽  
K. Bondarczuk ◽  
W. Kucharczyk
Keyword(s):  
Lithium Niobate ◽  
Temperature Dependence ◽  
New Method ◽  
Refractive Indices ◽  
Temperature Range ◽  
Method Of Determination ◽  
Induced Polarisation ◽  
Temperature Dependences

AbstractA new method of determination of individual linear electrooptic coefficients is proposed. The technique is based on the dynamic polarimetric measurements and takes into consideration the temperature dependences of ordinary and extraordinary refractive indices. Results obtained for the electrooptic coefficients r113 and r333 in LiNbO3 are presented. The coefficients are found to increase significantly within the considered temperature range 25-200°C. The temperature dependences of the intrinsic coefficients m113 and m333, defined in terms of the induced polarisation, are considered as well.

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