Equilibrium Phase Densities, Interfacial Tensions for the Ethane +n-Pentane System at 294.15 K

Abstract

The equilibrium phase densities and interfacial tensions of the binary mixture (ethane + n-pentane) have been measured simultaneously using the pendant drop method at 294.15 K. The experimental pressure was in the range of (6 to 30) bar. The measured phase densities are compared with calculated equilibrium densities by applying the GERG2004 equation. The deviations of the measured interfacial tension at each experimental condition are calculated on the basis of ISO combined standard uncertainty calculation recommendations. No open interfacial tension data for the system have been reported at any isothermal conditions. The measurement results extend the range of previous interfacial tension data of the hydrocarbon mixtures in the open literature.

Molecular Dynamics Simulations of the Vapor–Liquid Equilibria in CO2/n-Pentane, Propane/n-Pentane, and Propane/n-Hexane Binary Mixtures

“…For example, in the context of CO 2 injection, dissolution of CO 2 in hydrocarbons results in IFT reduction, which in turn lowers the capillary pressure and leads to higher oil recovery rates. , Therefore, understanding the effect of CO 2 miscibility on IFT under reservoir conditions can help with the design of gas injection processes . In addition to oil and gas recovery, the liquid–vapor IFT is known to be important for increasing the efficiency of separation scrubbers because the IFT affects droplet size distribution and re-entrainment . Finally, the investigation of interfacial properties at various pressures and temperatures is essential for other engineering applications such as internal combustion engines, where the IFT can impact the mixing behavior of fuels at high pressures and thus the engine efficiency …”

“…To the best of our knowledge, IFT data for binary systems composed of CO 2 and alkanes have been published for butane, pentane, , hexane, , heptane, ,, octane, decane, , dodecane, , tridecane, tetradecane, , and nonadecane . Regarding alkane binary mixtures, experimental IFT data are available for methane/propane, − methane/butane, ,,, methane/pentane, ,,, methane/hexane, ,, methane/heptane, ,,,,,, methane/octane, methane/nonane, , methane/decane, ,,− ,, ethane/pentane, ethane/hexane, , propane/pentane, propane/hexane, butane/decane, , and hexane/decane . However, the published data often cover only a limited rage of temperatures and pressures, and for many other mixtures with importance for petroleum and other engineering applications there are no IFT data available. , …”

“…While a number of experimental methods have been developed to measure the IFT of liquid–gas systems, the determination of the IFT is usually costly and time-consuming. In particular, for complex mixtures with varying compositions and under different pressure and temperature conditions, the sheer number of measurements required would quickly make such a task impractical.…”

Effects of Temperature and Pressure on Interfacial Tensions of Fluid Mixtures. II. Propane/n-Pentane and Propane/n-Hexane Binaries

“…For example, IFT controls the efficiency of heat and mass transfer operations since it is one of the properties that affects the absorption of gas into liquid . Despite its importance, measured IFT values have been reported only for a limited number of n -alkane mixtures in the literature, including methane/propane, , methane/butane, methane/pentane, methane/hexane, , methane/heptane, ,, methane/octane, methane/decane, ,,, ethane/ n -pentane, ethane/hexane, butane/decane, methane/propane/ n -decane, and methane/ethane/ n -pentane …”

Surface tension and critical point measurements of methane + propane mixtures

“…The component uncertainties contributing to the standard uncertainty for each addition of methane and propane from the pressure, temperature and volume change measurements, as well as from the unmixed volume are summarised in Table 3. These were combined using Equation 9 to give a standard uncertainty in Δn (1) of 4.5 x 10 -5 mol and Δn (2) of 5.05 x 10 -3 mol. This latter quantity is dominated by the uncertainty associated with the number of moles of propane in the un-mixed volume outside the cell, which can vary with time due to diffusion and thermo-diffusion 55 when the interface is static, and potentially by advective mixing when the interface was moved up or down.…”