Critical parameters and saturated densities in the critical region for trans -1,3,3,3-Tetrafluoropropene (HFO-1234ze(E))

Measurements of the saturated vapor and liquid densities near the critical point for trans-1,3,3,3-tetrafluoropropene (CFH=CHCF₃; HFO-1234ze(E)) were carried out in the reduced temperature range of 0.962 < T/T_c < 1 and in the reduced density range of 0.40 < ρ/ρ_c < 1.70. Taking into consideration the meniscus disappearing level as well as the intensity of the critical opalescence, the critical temperature T _c and critical density ρ_c were determined experimentally. The critical pressure P_c was calculated by extrapolating the vapor-pressure equation to the critical temperature. The critical parameters reported in this paper are T_c = (382.51 ± 0.01) K, ρ_c = (486 ± 3) kgm^-3, V_c = (235 ± 2) cm³mol^-1, and P_c = (3632 ± 3) kPa. The saturated liquid density correlation is formulated using the present data. In addition, the critical exponent β along the coexistence curve was also discussed.