Abstract
In this paper, an experimental apparatus based on a Calvet calorimeter (SETARAM BT2.15) was setup to measure the solid – liquid equilibrium for trifluoromethane (R23) plus difluoromethane (R32) binary system. The melting points of some pure alkanes and hydrofluorocarbons were measured to verify the accuracy of the apparatus, revealing a good consistency with the literature. Totally 20 different compositions of the R23 + R32 system in the temperature range from 107.00 K to 137.00 K were experimentally measured, which showed a eutectic behavior. The eutectic temperature is 107.50 ± 0.5 K with the latent heat of fusion of 67.13 J/g, and the mole fraction of R23 at the eutectic point is calculated to be 0.641 by Tamman's plot method. Moreover, the results for the solid – liquid equilibrium of the R23 + R32 system showed a good agreement with the prediction provided by the Schröder equation, with the deviation of eutectic temperature less than 1 K.
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