USE OF PHYSICAL-PROPERTIES FOR COMPOSITIONAL ANALYSIS OF TERNARY MIXTURES - APPLICATION TO MIXTURES OF 2-METHOXY-2-METHYLBUTANE, METHANOL, AND 2,2,4-TRIMETHYLPENTANE OR METHYLCYCLOHEXANE

Two ternary systems comprising gasoline components were characterized by determining their refractive indexes, densities, sound transmission speeds, and isentropic compressibilities at 25 degrees C and I atm pr essure. These data were then correlated with composition using a polyn omial. Single measurements of the refractive index and density of full y miscible mixtures of the system 2-methoxy-2-methylbutane (TAME) + me thanol + 2,2,4-trimethylpentane allowed estimation of its composition with precision better than +/- 0.002 mole fraction. However, it was sh own that this approach to compositional analysis of homogeneous mixtur es of TAME + methanol + methylcyclohexane would not give reliable resu lts.