Isothermal Vapor−Liquid Equilibrium Data of 1,1,1,2-Tetrafluoroethane (R134a) + Dimethylformamide (DMF) Working Fluids for an Absorption Heat Transformer

Abstract

Vapor-liquid equilibrium data of 1,1,1,2-tetrafluoroethane (R134a) + dimethylformamide (DMF) were measured in the temperature range from (303.30 to 353.24) K by the static analytic method. The results are of interest to test the possibility of using R134a as a refrigerant in combination with an organic absorbent, that is, DMF, in an absorption heat transformer. The experimental data are correlated using the Peng-Robinson equation of state in combination with the Mathias-Copeman R function, MHV1 mixing rules, and the non-random two liquid (NRTL) activity coefficient model. We have compared our experimental results to predictions obtained using the predictive Soave-Redlich-Kwong (PSRK) group contribution equation of state.

p–T–x Measurements for 1,1,1,2-Tetrafluoroethane (R134a) + N,N-Dimethylacetamide (DMA) and N-Methyl-2-pyrrolidone (NMP)

“…Previous works carried out by the same present authors are reported in the literature and one can cite Zehioua et al 2,3 . who considered the modeling and experimental measurements of isothermal vapor-liquid equilibrium data for different binary systems namely 1, 1, 1, 2-Tetrafluoroethane (R134a) + Dimethylformamide (DMF) working fluids used for an Absorption Heat Transformer (AHT) 2 and R134a + 1-Methoxy-2-(2methoxyethoxy) ethane (DMEDEG) and 1,2-bis(2-ethoxyethoxy) ethane (DMETrEG) 3 . Also…”

“…This latter has already been described in details by Laugier and Richon 7 . Also a detailed description of the used apparatus and the adopted experimental procedure were given by Zehioua et al 2 . The equilibrium temperature was measured using two (Pt-100) platinum probes where a priori a 25 Ω reference platinum probe (Tinsley, France) was used to calibrate both temperature sensors.…”

Phase Equilibrium Measurements and Modeling of 1-Propanethiol +1-Butanethiol + CH4 in Methane Ternary System at 303, 336, and 368 K and Pressure Up to 9 MPa

“…The detail of the experimental setup has been discussed in our previous manuscript 7 . The equipment is the same used by Zehioua et al 8 and the procedure is identical to…”

Phase Equilibria of Three Binary Mixtures: Methanethiol + Methane, Methanethiol + Nitrogen, and Methanethiol + Carbon Dioxide

“…The experimental work has been carried out at CEP-TEP (Centre Eńergetique et Procedeś), MINES ParisTech, France, where a "static−analytic" technique based apparatus consisting of an equilibrium cell equipped with one moveable rapid online sampler injector (ROLSI) was used. The equipment is identical to the one used by Zehioua et al, 6 and the procedure is identical to Coquelet et al 7 The ROLSI sampler is capable of making vapor−liquid samples without disturbing the equilibrium concentration and pressure, since the size of the samples (less than 1 μL) is negligible compared to the volume of the cell, that is, 20 cm 3 . The liquid and vapor samples are analyzed using a gas chromatograph (Varian model CP-3800), equipped with a thermal conductivity detector (TCD), and a flame ionization detector (FID).…”