Vapor-liquid equilibrium data have been measured in a vapor circulating (modified Colburn) still at 760 mm. of Hg for the 2,3-dimethylbutane-methanol system, which shows a minimum-boiling azeotrope at 0.39 mole fraction of methanol and 44.5°C ., and for the 2,3-dimethylbutane-methanol-chloroform system, for which no ternary azeotrope was found at atmospheric pressure. The ternary data were analyzed and compared with equilibrium data predictions, utilizing a modified form of the Wilson equation.The VAPOR-LIQUID equilibrium data were determined as part of an over-all research program whose purpose is to develop experimentally nonideal multicomponent system data, to supply information concerning extremely nonideal systems, and to serve as a basis for testing predictive methods. The ternary system described here is composed of three binary systems, each forming a minimum-boiling azeotrope. However, no ternary azeotrope was found, probably because of the differences in the three binary azeotropic temperatures.

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