Prediction of binary critical loci by cubic equations of state
Palenchar, Robert M.
Leland, Thomas W.
Master of Science
The equations of state by Redlich Kwong, Soave, Peng and Robinson, Adachi, and Teja generated the critical loci of four class 1 and four class 2 binary mixtures. Two unlike pair parameters were used to fit the equations to a single experimental critical point in the mixture. The Teja equation was the most accurate for class 1 mixtures with a .9% deviation in predicting critical temperatures and a 2.6% deviation in predicting critical pressures. The Peng and Robinson equation was least accurate with errors of 1.9% and 4.5% respectively. For class 2 systems, none of the equations were quantitatively correct in generating the critical curves. The Soave equation was the only one to at least qualitatively predict the critical lines for all the mixtures. All of the equations were incapable of accurately predicting the critical volumes of the mixtures.