1vLAl-, 1940
INDUSTRIAL AND ENGINEERING CHEMISTRY
701.
measurement of the pressure, temperature, and density of SATURATED VAPOR DENSITY OF FLUOROCHLOROthe vapor sample. The data obtained, together with the corHYDROCARBONS responding pressures as calculated from the equations of Compound Temp. Satd. Yapor Density state, are shown in Tables I1 t o V. c. Gram/cc. A few saturated vapor density measurements were made a t CHClzF 132.2 0.105 high pressures and densities by determining the dew points 159 0.196 167 0.299 of samples contained in sealed glass tubes. Weighed quanti136.2 0.08'3 CClsF ties of material were sealed in clean glass tubes of known vol0.193 173.1 0.200 176.0 ume, and the temperature a t which the liquid was completely 0.241 182.4 vaporized was determined with an estimated accuracy of 0.159 180.1 CCIzF-CCIF2 * 0.3" C. Measurements were made on CHCl,F, CC13F,and 0.244 198.2 0.292 204.4 CClZF-CClF2 a t densities between 0.1 and 0.3 gram per cc. The results are given in Table VI. The only published data on the P-V-T relations of any of these compounds are those of Riedel (6) on CC12F-CCIFt. A in correlating the equation of state with the experimental comparison of representative values from his data and values data. At present no explanation has been found for the calculated from our equation of state is given in Table V. anomalous molecular weight of CHClF2. TABLEVI.
Other Vapor Density Measurements A number of additional vapor density measurements were made on all of the compounds by the Dumas method. They were carried out a t pressures ranging from 0.25 to 2.5 atmospheres and a t temperatures between 20' and 130" C., in a calibrated glass container of approximately 525 cc. capacity. The usual precautions were taken to ensure the accurate
Literature Cited (1) Beattie, J. A,, and Bridgeman, 0. C.. J . Am. Chem. SOC. SO, 3133-8 (1928). (2) Benning, A. F., and McHarness, R. C.. IND. Eso. CHEM.,31, 912-16 (1939). (3) Ibid., 32, 497 (1940). (4) Buffington, R. M., and Gilkey, W. K., Ibid., 23, 254-6 (1931)'. (5) Riedel, L.,2. ges. K b l t e - I d . , 45, 221-5 (1938). CONTRIBUTION 4 from Kinetic Chemicals, Ino.
THE ALCHEMIST By HARRYCIMINO
T h r o u g h the courtesy of Mr. Walter Yust, cditorof the Encyclopedia Britannica, we are enabled to reproduce a very recent pen-and-ink drawing which the latter used last year in an information circular. The original of this, No. 113 in the Berolzheimer series of Alchemical and Historical Reproductions, is 6 by 8 inches. The artist, Harry Cimino of Falls Villagc. Connecticut, has with a minimum of apparatus, nicely shown the alchemist ac his studies, while at the same timc avoiding the usual clutter present in most alchemical paintings.
D. D. BBROLZHEIMER 50 East 41% Street
New York, N. Y.
A list of the first % rc roductions a pcarcd in our January. 1939, issue, page 124. T h e fist of rcpmfuctionr 97 to 108 ipppeirr i n January, 1940, page 134. An additional reproduction rppcars each month.
