Experimental measurements and theoretical modeling of high-pressure mass densities and interfacial tensions of carbon dioxide + n-heptane + toluene and its carbon dioxide binary systems

Phasepy: A Python based framework for fluid phase equilibria and interfacial properties computation

“…As an example, the ternary mixture of carbon dioxide (1), toluene (2), and n ‐heptane (3) is modeled with Phasepy. This selection is due to that the interfacial behavior of the mixture was already characterized by experimentation and by a theoretical approach using SGT, 70 this study showed good agreement between theory and experimentation when β ij = 0 is used for all pairs. In this example, the mixture will be modeled with PRSV EoS and QMR mixing rule, were k ij were fitted to experimental phase equilibria data 71–73 .…”

“…The density profiles of the mixture at the given conditions are shown in Figure 8a where a strong surface activity of CO 2 is observed while both toluene and n ‐heptane behave monotonically across the interface. For the given temperature and global composition this procedure can be repeated at different pressures, the results are compared against experimental data 70 where good agreement is found between them.…”

“…Interfacial tension of the mixture CO 2 (1) + toluene (2) + n ‐heptane (3) at 344.15 K. (a) CO 2 (—), toluene (‐ ‐ ‐), n ‐heptane (…) density profiles for mixture z 1 = 0.5, z 2 = 0.25 at 40 bar. (b) Interfacial tension, (▪) Experimental data, 70 (—) PRSV + QMR and β ij = 0 …”

Mini Review of Miscible Condition Evaluation and Experimental Methods of Gas Miscible Injection in Conventional and Fractured Reservoirs

“…According to the theory, when the IFT of two phases tends to zero, then the two phases completely form one phase. In other words, the condition that creates zero IFT is the miscibility of two fluids. ,,− Increasing the pressure reduces the IFT. ,, However, instruments and methods for measuring surface tension are not currently able to measure zero IFT. Therefore, extrapolation of IFT relations in terms of different fluid pressures helps to measure the MMP.…”

A Novel Experimental Procedure to Measure the Bulk Mass Densities and Interfacial Tensions for Mixtures at Vapor–Liquid–Liquid Equilibria

“…Specifically, this work is focused on the description of an experimental methodology and the theoretical modeling to describe both bulk densities and interfacial tensions for the case of VLLE. Considering previous works − and our experience in tensiometric determinations using different types of tensiometers at different conditions (see for example refs − and references therein), one of the most appropriate devices for the IFT at three-phase equilibrium (VLLE) is the pendant drop tensiometer coupled to a vibrating tube densimeter. The main advantages of this combined devices are (i) the possibility to control (or measure) both temperature and pressure; (ii) the measure of vapor, liquid 1 and liquid 2 bulk densities at the same conditions of IFT; (iii) the tensiometer chamber allows for creating the vapor–liquid–liquid (VL 1 L 2 ) condition; (iv) the three IFTs (VL 1 , VL 2 , and L 1 L 2 ) can be independently measured in the pendant drop device; (v) the IFT measurements range in a pendant drop device covers the range 0.1 to 80 mN m –1 allowing us to measure all IFTs for the VLLE condition.…”