during weighing intervals. There is the additional possibility of decomposition of the glycerol during the ten successive distillations used for preparation. These probably were simple distillations at atmospheric pressure (b.p. 290°C.) and, since polymerization and decomposition are reported to begin at little over 200°C. (7), the purity of the Table I. Isothermal Compressibility Factors of 2,2-Dimethyl propane (Neopentane)

We have used recent ethylene/low‐density polyethylene gas sorption data to calculate phase equilibria for ethylene/polyethylene mixtures from 0 to 30.3 MN/m2 (0 to 300 atm), the pressure range normally used in the flash separation step in low‐density polyethylene manufacture. The computations show significant differences from results obtained by extrapolation of the results of a previous study to the relatively low pressure range considered here.

for their counsel. A. Pelczarski assisted with the experimental measurements, and B. N. Pike with the calorimeter construction. LITERATURE CITED(1) Air Conditioning and Refrigeration Institute, Washington, D. C., "Properties of Commonly Used Refrigerants," 1957. (2) American Society of Refrigerating Engineers, New York, "ASRE Refrigerating Data Book," Table 34, p. 194, 1951.

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