Vapor–Liquid Equilibrium for the Binary Systems 1,1,2,3,3,3-Hexafluoro-1-propene (R1216) + 2,3,3,3-Tetrafluoroprop-1-ene (R1234yf) and 1,1,2,3,3,3-Hexafluoro-1-propene (R1216) + trans-1,3,3,3-Tetrafluoropropene (R1234ze(E))

Abstract

The vapor−liquid equilibrium (VLE) for the binary systems 1,1,2,3,3,3-hexafluoro-1-propene (R1216) + 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) and 1,1,2,3,3,3-hexafluoro-1-propene (R1216) + trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) have been investigated from 283.43 to 323.32 K and 283.28 to 323.16 K, respectively. The experimental apparatus was a recirculation system with a liquid phase pump to accelerate the VLE process. The Peng−Robinson equation of state combined with Mathias−Copeman alpha function, modified Huron−Vidal mixing rule, and nonrandom two-liquid activity coefficient model was employed to correlate the VLE data. The correlated results showed good agreement with the experimental results for the two mixtures. The average absolute relative deviation of pressure (AARDp) and average absolute deviation of vapor composition (AADy) were 0.32% and 0.003 for R1216 + R1234yf, and 0.21% and 0.004 for R1216 + R1234ze(E), respectively. The experimental and correlated results showed that there was a positive azeotrope for the system R1216 + R1234yf over all tested temperatures.

Experimental Investigation of Vapor–Liquid Equilibrium for 2,3,3,3-Tetrafluoropropene (HFO-1234yf) + trans-1,3,3,3-Tetrafluoropropene (HFO-1234ze(E)) at Temperatures from 284 to 334 K

“…Parameter α­( T ) is associated with the Mathias–Copeman (MC) alpha function, which is defined as follows where m 1 , m 2 , and m 3 are three adjustable parameters fitted to the experimental data, as shown in Table . The MC parameters fitted in this work are derived from the work of Fang et al in the temperature range of 283.28–333.44 K.…”

“…Experimental Apparatus. The VLE measurement of the binary system (HFO-1234yf + HFO-1234ze(E)) was conducted in an experimental apparatus based on the recirculation method, which has been used in the work from Fang et al 24 The experimental apparatus for measuring VLE was mainly composed of an equilibrium cell, a thermostatic bath, temperature and pressure measurement systems, and a composition acquisition system. The schematic diagram of the apparatus is shown in Figure 1.…”

Vapor–Liquid Equilibria for the Binary Systems Difluoromethane (R32) + trans-1,1,1,4,4,4-Hexafluoro-2-butene (R1336mzz(E)) and Fluoroethane (R161) + trans-1,1,1,4,4,4-Hexafluoro-2-butene (R1336mzz(E))

“…Experimental Apparatus. The experimental apparatus, shown in Figure 1, was similar to the one used by Fang et al 27 The experimental apparatus for measuring VLE was mainly composed of the equilibrium cell, thermostatic bath, temperature and pressure measurement systems, and composition acquisition system. The schematic diagram of the apparatus is shown in Figure 1.…”