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Diffusion coefficients in hydrocarbon systems: Methane in the liquid phase of the methane–n-heptane system

✍ Scribed by H. H. Reamer; B. H. Sage

Publisher
American Institute of Chemical Engineers
Year
1957
Tongue
English
Weight
545 KB
Volume
3
Category
Article
ISSN
0001-1541

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✦ Synopsis

Abstract

The production and refining of petroleum involve many processes in which conditions deviate markedly from equilibrium. For prediction of the behavior of such nonequilibrium systems, information concerning the molecular‐transport characteristics of the paraffin hydrocarbons is of practical interest.

Fick diffusion coefficients for methane were measured in the liquid phase of the methane–n‐heptane system at temperatures between 40° and 340°F. at pressures up to 3,500 lb./sq. in., but the pressure range was limited at the higher temperatures by approach to the critical state of this binary system.

The measurements obtained confirmed the fact that the Fick diffusion coefficients for methane decrease with an increase in the concentration of this component and increase rapidly with an increase in temperature for a constant composition. These data together with similar information for other binary paraffin hydrocarbon systems indicate that the Fick diffusion coefficients for methane decrease with an increase in the molecular weight of the less volatile component.

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