Design of a high-pressure ebulliometer,with vapor-liquid equilibrium results for the systems CHF2 Cl + CF3 CH3 and CF3 CH2 F + CH2F2 |
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| Authors: | L. A. Weber A. M. Silva |
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| Affiliation: | (1) Thermophysics Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, 20399 Gaithersburg, Maryland, USA;(2) Present address: White Martins Gases Industriais SA, Rua Mayrink Veiga 9/9° andar, 20090-050 Rio de Janeiro, RJ-Brazil |
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| Abstract: | We describe the design and operation of a new high-pressure metal ebulliometer which can operate at pressures to at least 3 MPa in the range 220–400 K. Infinite-dilution activity coefficients are presented for the system CHF2Cl + CF3-CH, at 275 K and for the system CF3-CH2F + CH2F2, at 260, 230, and 300 K. The Wilson activity coellicient model and a virial coefficient model are applied to these systems, and the phase equilibrium conditions are calculated. The results are shown to agree well with predicted and with published measured values. The excess enthalpy is calculated and compared with results from a Peng Robinson equation of state. Vapor densities on the dew curves are given. |
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| Keywords: | activity coefficients chlorodilluoromethane (R22) difluoromethane (R32) ebulliometry phase equilibriun refrigerant mixtures 1,1,1-trifluoroethane (R143a) 1,1,1,2-tetrafluoroethane (R134a) |
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