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

John E. McCormick


The approximate physical model for solute-solvent inter?actions presented by J, M, Prausnitz and R, Anderson1 is briefly discussed, Applicability of Weimer, Prausnitz3 and Helpinstill, Van Winkle7 models is investigated using experimental values of activity coefficients for C5 hydrocarbons in 13 solvents including one nonpolar and 12 polar solvents. Independent correlations, based on our experimental values at 45°C for normal and isopentane have been developed. Although the required thermodynamic properties are obtained through a comparative analysis of all the available and estimated methods, dependable values of activity coefficients for Isopentane and 1-Pentene could not be obtained through the experi?ments. Developing separate correlations for normal and isoparaffins, therefore, could not be made possible.

It is concluded that, in spite of the close molar volumes, the main contributions to the selectivity functions result from physical effects, especially from dispersion forces. Selectivities have been better correlated using our model (after adjusting the values of solutes solubility parameters) than predicted by other models3,7 Effects of chemical forces could not be precisely stated.



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