Comparative study of associated species in vapors of alcohols and water by measurement of thermal conductivity. [Association as dimers or tetramers; 2,2,2-trifluoroethanol]
Conference
·
OSTI ID:7285895
Measurements of the thermal conductivities of methanol, trifluoroethanol, ethanol, and water vapors have been made as a function of pressure and temperature with a thick hot wire cell using a relative method in which the cell was calibrated with N/sub 2/, Ar, and Kr. Comparisons of the results for the different vapors can readily be made since all the measurements were performed with the same apparatus. At any given temperature (330 to 400/sup 0/K), the thermal conductivities increased with pressure (7 to 160 kPa), indicating the presence of associated species in all the vapors. From the data, association constants were deduced as well as standard enthalpies and standard entropies for the formation of the associated vapor species. Dimeric molecules were detected in trifluoroethanol, ethanol, and water vapor; and a tetramer species was detected in methanol and ethanol. In quantum mechanical calculations, the cyclic hydrogen bonded tetrameric species is especially stable, supporting the conclusions that the pressure dependence of the thermal conductivities of methanol and ethanol is related to the presence of tetramer. Consistent with the quantum mechanical calculations, the measurements indicate that the trifluoroethanol dimer bond is strongest. Transport parameters deduced from the data are also reported.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7285895
- Report Number(s):
- CONF-770537-1
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Tue Jan 03 23:00:00 EST 1978
· J. Am. Chem. Soc.; (United States)
·
OSTI ID:5308075
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Journal Article
·
Wed Dec 31 23:00:00 EST 1980
· Int. J. Thermophys.; (United States)
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·
Wed Mar 31 23:00:00 EST 1982
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·
OSTI ID:6497968
Related Subjects
090210 -- Alcohol Fuels-- Properties-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALCOHOLS
CHEMICAL BONDS
DIMERS
ENTHALPY
ENTROPY
ETHANOL
FLUIDS
GASES
HYDROXY COMPOUNDS
MECHANICS
METHANOL
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
QUANTUM MECHANICS
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
VAPORS
WATER VAPOR
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALCOHOLS
CHEMICAL BONDS
DIMERS
ENTHALPY
ENTROPY
ETHANOL
FLUIDS
GASES
HYDROXY COMPOUNDS
MECHANICS
METHANOL
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
QUANTUM MECHANICS
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
VAPORS
WATER VAPOR