Abstract
THE phase behaviour of the nitrogen–methane–ethane system in the vicinity of −255° F has been reported in an earlier communication1. The system has subsequently been studied at lower temperatures by lowering the freezing point of the isopentane bath liquid with propane gas. It was found that a liquid phase inversion took place between the temperatures −255° F and −263.3° F, the bottom liquid layer being the nitrogen-rich phase at −263.3° F and the ethane-rich phase at −255° F. Binodal curves for the saturated liquids at these two temperatures are shown in Fig. 1, in which BL denotes the bottom layer. The phase inversion temperatures together with the equilibrium liquid–liquid compositions obtained in this investigation are listed in Table 1. In all cases investigated, the nitrogen composition in the equilibrium vapour phase was greater than 97 per cent.
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References
Lu, B. C.-Y., Yu, P., and Poon, D. P. L., Nature, 222, 768 (1969).
Schindler, D. L., Swift, G. W., and Kurata, F., Hydrocarbon Proc. Pet. Ref., 45, 205 (1966).
Din, F., Thermodynamic Functions of Gases, 3, 139 and 172 (Butterworths, London, 1961).
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LU, BY., YU, P. & POON, D. Liquid Phase Inversion. Nature 225, 1128–1129 (1970). https://doi.org/10.1038/2251128a0
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DOI: https://doi.org/10.1038/2251128a0
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