| 초록 |
The thermodynamic phase equilibrium is a core concern in chemical process design. The design and operation are based on a knowlege of phase equilibria coexisting phases and phase equilibrium information is also essential in the development of new chemical processes. Hydrofluorocarbons(HFCs) such as HFC-23 are promising alternative refrigerants to replace chlorofluorocarbon (CFCs). HFCs are stable but very expensive, on the other hand, hydrocarbons are flammable but very cheap. Mixtures of the two compounds may have good potential as alternative refrigerants. Vapor-liquid equilibrium data are required as one of the most important types of information in evaluating the performance of refrigeration cycles and determining their optimal compositions. In this work, vapor-liquid equilibrium(VLE) of the mixture composed of trifluoromethane(R-23) and propane(R-290) was studied in the temperature range between 273.15 and 293.15K, using a recirculation apparatus in which the vapor is forced through the liquid. The phase compositions at equilibrium were measured by gas chromatography and the experiment data were regressed with the Peng-Robinson equation of state using the Wong and Sandler mixing rule(PRWS) within the uncertainty of ±1.0%. |
