Thermogravitational Thermal Diffusion in Liquids. II. Experimental Thermal Diffusion Factors for Carbon Tetrachloride—Cyclohexane at 25°C

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Abstract
An experimental investigation of thermogravitational thermal diffusion in carbon tetrachloride—cyclohexane at 25° is described, and thermal diffusion factors for this system are calculated on the basis of the formal theory derived in the preceding paper. The procedure for determining the required compositions involves a special weighing technique and Rayleigh interference refractometry. A new method for using the latter is presented. The design, construction, and use of a cyclindrical thermogravitational apparatus are discussed. Small numerical corrections are made for the production and thermal diffusion of impurities, one of which is apparently cyclohexylhydroperoxide. Calculated thermal diffusion factors agree well for most compositions with results of pure thermal diffusion measurements.