Vapor-liquid equilibria of non-azeotropic halogenated hydrocarbon mixtures under high pressure.

概要

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The vapor–liquid equilibrium phase composition of three binary non-azeotropoic halogenated hydrocarbon systems were measured in the following temperature and pressure ranges; chlorodifluoromethane (R22) + 1,2-dichloro-1,1,2,2-tetrafluoroethane (R114): 253, 283, 313, 338 K, 0.08–2.59 MPa, dichlorodifluoromethane (R12) + R114: 253, 283, 313 K, 0.06–0.90 MPa, bromotrifluoromethane (R13B1) + R12: 253, 283, 313 K, 0.21–2.09 MPa. Determination of the equilibrium data was carried out in an apparatus which can circulate vapor and liquid phase alternately. The uncertainties in measurement were less than 50 mK in temperature and 8 kPa in pressure. The uncertainties in the equilibrium composition near 0.5 mole fraction were less than 0.009 mole fraction, and near 0.9 or 0.1 are less than 0.003. Simple consistency tests were applied to check the experimental data. Their results show the reliability of the present experimental data. Two equations of state, the P–R equation and the S–R–K equation, were used to correlate the vapor–liquid equilibrium relationships of these systems. It was found that both equations of state reproduce the experimental data satisfactorily by introducing the binary interaction parameter into the conventional mixing rule.
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