Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers
- Centro de Quimica Estrutural, Lisboa (Portugal)
This paper presents a study of the influence of branching in the binary diffusion coefficients of n-heptane + n-hexane isomers, in the liquid state. The measurements have been made with the Taylor dispersion technique, at several compositions, at 283 and 298 K, for the X + n-heptane mixtures, where X = n-hexane, 3-methylpentane, 2,3-dimethylbutane, and 2,2-dimethylbutane. The results show a very interesting behavior of the composition dependence of the binary diffusion coefficients, presenting a maximum for compositions about a molar fraction of n-heptane of 0.5, which increases with the increase in the degree of branching, suggesting the possibility of order-disorder effects caused by stereochemically favored packing in the liquid phase and energetically favored segment interaction in the liquid mixtures. An attempt to apply the van der Waals model to these data could not predict the experimental binary diffusion coefficients of these systems within the experimental accuracy.
- OSTI ID:
- 6256001
- Report Number(s):
- CONF-880606-; CODEN: IJTHD
- Journal Information:
- International Journal of Thermophysics; (USA), Vol. 10:5; Conference: 10. symposium on thermophysical properties, Gaithersburg, MD (USA), 20-23 Jun 1988; ISSN 0195-928X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BINARY MIXTURES
SELF-DIFFUSION
HEPTANE
HEXANE
ISOMERS
ACCURACY
ALKANES
CHEMICAL COMPOSITION
COUPLING CONSTANTS
DILUTION
DISPERSIONS
EXCITED STATES
HARD-SPHERE MODEL
LIQUIDS
MEASURING METHODS
MOLECULAR STRUCTURE
OCTANE
POLYATOMIC MOLECULES
PRESSURE DEPENDENCE
QUANTITY RATIO
TEMPERATURE DEPENDENCE
THERMODYNAMICS
VAN DER WAALS FORCES
DIFFUSION
ENERGY LEVELS
FLUIDS
HYDROCARBONS
MIXTURES
MOLECULES
ORGANIC COMPOUNDS
400201* - Chemical & Physicochemical Properties