Thermal conductivity measurements and molecular association in ethanol vapor
Thermal conductivity measurements on ethanol vapor are reported as a function of temperature (329-419K) and pressure (100-1800 torr). The thermal conductivity versus pressure plots at constant temperature exhibit strong upward curvature at the lower temperatures and nearly linear increases at the higher temperatures. This enhancement in the thermal conductivity is indicative of the presence of a dimeric species and one or more larger clusters in the vapor. Analysis of the data gave best fits for monomer-dimer-tetramer and monomer-dimer-hexamer models. The resulting thermodynamic parameters for the association reactions in the monomer-dimer-tetramer model are: -..delta..H/sub 2/ = 3.70 kcal mol/sup -1/, -..delta..S/sub 2/ = 16.36 cal mol/sup -1/ K/sup -1/; -..delta..H/sub 4/ = 22.15 kcal mol/sup -1/, -..delta..S/sub 4/ = 74.65 cal mol/sup -1/ K/sup -1/. Quantum mechanical evidence indicates that the tetramer is the most probable associated species larger than the dimer.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5508027
- Report Number(s):
- CONF-791134-8
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal conductivity measurements and molecular association in a series of alcohol vapors: methanol, ethanol, isopropanol, and t-butanol. [Temperature and pressure dependence]
Studies of molecular association in H/sub 2/O and D/sub 2/O vapors by measurement of thermal conductivity
Related Subjects
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALCOHOLS
DIMERS
ETHANOL
FLUIDS
GASES
HYDROXY COMPOUNDS
ISOTHERM
MEDIUM TEMPERATURE
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
VAPOR PRESSURE
VAPORS