Vapor-Liquid Equilibria in the System 2-Propanol-2,2,4-Trimethylpentane.

Abstract

rl;: 1.37505 1.3749 (3) 1.38908 1.38898 (3) d: 0.7761 0.77690 (13) 0.68341 0.68366 (3) Normal b. p., C 82.2 82.18 (3) 99.2 99.23 (3) Refractive indices were determined with a Bausch & Lomb precision refractometer (sugar) using a sodium vapor lamp illuminator. The temperature of the prisms was maintained constant within *0.05 C. by a Precision Scientific constanttemperature circulator. Twelve mixtures of the purified liquids were prepared gravimetrically. To avoid evaporation, a short rubber tube, one end closed by a plug of glass, was connected to the mouth of a 60-ml. bottle. A hypodermic needle was introduced into the rubber tube, and the bottle was evacuated by means of a vacuum pump. The empty bottle was weighed. The first component of the mixture was injected by means of a hypodermic syringe. After the bottle had been reweighed, the second component was introduced in the same manner, and the final weight determined. Three samples of each mixture were taken and placed directly between the prisms of the precision refractometer, which were kept at 30 C. A large graph of n io against mole fraction of 2-propanol was prepared and used to determine the compositions of the equilibrium mixtures. Exptl. Lit. Exptl. Lit.