vapor-liquid equilibrium (VLE) data for the (O 2 + C 3 H 8 ) binary system were measured using a "static-analytic" method coupled to a gas chromatograph analysis at temperatures of (110.22, 120.13, 130.58, and 139.95) K. Parameters of a proposed thermodynamic profile were adjusted on the basis of experimental VLE data determined in this work, allowing a complete isothermal phase diagram for this hazardous system to be obtained. The vapor-liquid-liquid equilibrium (VLLE) thermodynamic behavior was predicted by modeling and then confirmed by visual observations. On the basis of this work, solubility values of propane in liquid oxygen can be deduced for both the propane-lean and propane-rich liquid phases at temperatures above the melting temperature of pure propane. The device allowing these data to be measured for such a hazardous mixture is also presented, as are the accuracies of the measurements.
Experimental SectionChemicals. Oxygen (CAS no. 7782-44-7) was obtained from Air Liquide with guaranteed mole fraction purity > 0.999995. Propane was provided by Messer with certified mole fraction purity > 0.9995.Apparatus. The method used in the present work was of the "static-analytic" type with a rapid online sampler-injector (ROLSI; Guilbot et al. 7 ) pneumatic microsampling device and online gas chromatographic analyses. 7,8 A 12 cm 3 Hastelloy C276 equilibrium cell was specifically designed and built in order to withstand pressures up to 300 MPa in case of accidental internal ignition of the oxygen-propane mixture. 6 Inside the cell, temperature and pressure were measured with uncertainties † Part of the "Sir John S. Rowlinson Festschrift".
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