This and a previous investigation (10) were undertaken to obtain data to be used in the study of distillation of ternary mixtures. The densities, surface tensions, viscosities, refractive indices, and specific heats for the ternary system ethyl alcohol-glycerin-water are reported in this paper. A later paper will contain latent heats, boiling points, vapor pressures, and liquid-vapor composition data for the two ternary systems.Densities (4), specific heats (13), refractive indices (11), and viscosities (19) of the binary system glycerin-water have been determined previously by various experimenters. The binary system ethyl alcohol-water has been investigated by Bose (6), who determined specific heats, and by Winkler (22) for density. This investigation includes the determination of densities, surface tensions, viscosities, refractive indices, and specific heats of the ternary system ethyl alcohol-glycerin-water. EXPERIMENTAL Materials. Glycerin of the c.p. grade was purified by repeated distillation under reduced pressure, c.p. ethyl alcohol was treated successively with metallic calcium, sodium hydroxide, and finally with metallic sodium, and distilled after each addition. The water was treated with potassium permanganate and distilled; then treated with barium hydroxide and distilled repeatedly. The physical constants of the purified materials are given in table 1. Preparation of samples. The samples were prepared on a weight per cent basis in increments of 10 per cent. The composition of these samples is shown in table 2.Apparatus. Densities were determined by using a Geissler pycnometer. An Ostwald-Poiseuille viscosimeter (23) was employed for the determination of viscosities. The surface tension was measured by means of the 1 Presented before the Division of Physical and Inorganic Chemistry at the Mid-West Regional Meeting of the American Chemical Society, October 31 to November 2, 1935.
THE study of the reactions of the alkaline earth sulfates being made in these laboratories originated from a suggestion by Farr (2) of the Mallinckrodt Chemical Works, who patented a process for a method of preparing blanc fixe from barite. Shreve and Pritchard (9) showed that the reaction BaS04 + CaCh -BaCh + CaS04 approached completion from left to right in strong aqueous solutions. Upon dilution with water the reverse occurred.The study of these reactions requires the use of organic solvents to separate the chlorides from the sulfates. Shreve et al. (10) patented such processes for making the chlorides and nitrates of barium and strontium.
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