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Diffusion Coefficients in Hydrocarbon Systems. Homogeneous Phases at Elevated Pressures

Gavalas, G. R. and Reamer, H. H. and Sage, B. H. (1968) Diffusion Coefficients in Hydrocarbon Systems. Homogeneous Phases at Elevated Pressures. Industrial & Engineering Chemistry Fundamentals, 7 (2). pp. 306-312. ISSN 0196-4313. doi:10.1021/i160026a020.

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The phenomenon of change in pressure accompanying gaseous diffusion in a closed isochoric, isothermal system has been studied experimentally and theoretically. Special equipment has been developed for measuring pressure differences with an accuracy better than 0.01 p.s.i. at total pressure levels of hundreds of pounds per square inch. The theoretical analysis shows that as the system approaches equilibrium, the pressure as a function of time assumes the simple exponential form p - p_(eq) = -ae^(-bD_(12)t, where p_(eq) is the equilibrium pressure, D_(12) is the binary diffusion coefficient, a is a thermodynamic quantity, and b is a constant depending on the size and shape of the diffusion cell. This expression can be used for the determination of D_(12) from pressure-time measurements. Measurements upon the system CH_4-C_3H_8 at T = 160° F. and p_(eq) = 570 p.s.i. have shown the applicability of this method, but more experimental work is required for ascertaining its accuracy.

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Gavalas, G. R.0000-0003-1468-6835
Additional Information:© 1968 American Chemical Society. Received for review October 12, 1967. Accepted March 14, 1968. Work supported in part by American Petroleum Institute Project 37 at the California Institute of Technology.
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American Petroleum InstituteProject 37
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Official Citation:Homogeneous Phases at Elevated Pressures G. R. Gavalas, H. H. Reamer, and B. H. Sage Industrial & Engineering Chemistry Fundamentals 1968 7 (2), 306-312 DOI: 10.1021/i160026a020
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60908
Deposited By: George Porter
Deposited On:12 Oct 2015 22:18
Last Modified:10 Nov 2021 22:41

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