Document Type


Date of Award


Degree Name

Master of Science in Chemical Engineering - (M.S.)


Chemical Engineering

First Advisor

Joseph Joffe

Second Advisor

Carl W. Carlson

Third Advisor

C. L. Mantell


The theory and usefulness of vapor phase activity coefficients have been developed. The equations, charts and calculation procedures to be used for the three methods are included with a set of sample calculations in their most convenient form.

Activity coefficients for 236 experimental points have been calculated by the three methods for both components of tour binary gaseous systems. These systems are Argon - Ethylene (36 points), Hydrogen - Nitrogen (32 points), Methane - Ethane (112 points) and Methane - n Butane (56 points). Wide ranges of pressure, temperature and mol fraction are included.

The % deviations of calculated from experimental activity coefficients have been determined. Fran these deviations and a time study, the general and specific utilities of the three methods have been estimated.

Results indicate that the method of Redlich et al is of greatest all-round utility. It is applicable to all substances and conditions tested herein, and its overall accuracy is superior to the other two methods. The method of Edmister and Ruby takes only 1/3 the time but appears to be limited to the light hydrocarbons for which it was derived. Its accuracy is generally the equal of that obtainable by Redlich's method. The method of Joffe takes 20% longer than that of Redlich et al, and while also of all round utility, seldom approaches it or the method of Edmister and Ruby in accuracy.



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