Measurements of Critical Properties of the Binary Mixture of 1,1,1-Trifluoroethane (HFC-143a) + trans-1,3,3,3-Tetrafluoropropene (HFO-1234ze(E))

The critical temperatures and pressures of the binary mixture of 1,1,1-trifluoroethane (HFC-143a) + trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) were measured by a set of apparatus containing an optical cell that has a variable inner volume. The experimental measurements were carried out based on a static method, and the critical properties were determined by means of the observation of disappearance and reappearance of the meniscus. The experimental uncertainties in pressure, temperature, and mole fraction were estimated to be less than 6.2 kPa, 0.02 K, and 0.003, respectively. The experimental critical properties measured in this work were correlated by the Redlich-Kister method, and the correlated results showed a good agreement with experimental data.