Document Type


Date of Award


Degree Name

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


Chemical Engineering and Chemistry

First Advisor

Dimitrios P. Tassios

Second Advisor

Deran Hanesian

Third Advisor

Joseph Joffe


The PVT prediction capability of the Redlich-Kwong equation is substantially improved through the use of a generalized correlation based on the acentric factor. No experimental data is required to obtain the improved constants. Only the acentric factor and the critical properties of the pure gas are needed. The correlation of improved constants is limited to non-polar and slightly polar pure gases and mixtures in the supercritical temperature range.

The correlation applies to a reduced temperature range 1.00 le; TR le; 1.60 and a reduced pressure range of 0.030 le; PR le; 3.00. The correlation reduces deviations by as much as ten fold over the PVT predictions by the original Redlich-Kwong equation.

Specifically, for pure gases used in this study the average maximum absolute error is 4.7% using the modification against 24.8% for the original Redlich-Kwong equation. The average absolute error is 1.44% against 7.6%. For the gas mixtures evaluated, the average maximum absolute error is 4.9% against 13.0% for the original equation; the average absolute error is 1.7% against 5.3%. Along with the analytical form of the correlation a set of curves is provided for rapid evaluation of the improved Redlich-Kwong constants.



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