Measurement and Modeling of the Solubility of Water in Supercritical Methane and Ethane from 310 to 477 K and Pressures from 3.4 to 110 MPa

Abstract

We describe a new flow cell apparatus for measuring the water content of gases up to 120 MPa at 490 K that uses a combination of gravimetric and electrical resistance techniques to determine the solubility of water in the gaseous phase. The new experimental data for the solubility of water in supercritical methane and ethane were obtained with our apparatus spanning pressures from 3.4 to 110 MPa covering a temperature range from 310 to 477 K. We model the experimental results by combining two equations of state; vapor-phase fugacities and fugacity coefficients are calculated with a modified Peng−Robinson equation of state, and aqueous-phase fugacities are calculated using an equation by Wagner and Pruss (J. Phys. Chem. Ref. Data 2002, 31, 387−535) or by a modification of a correlation developed by Saul and Wagner (J. Phys. Chem. Ref. Data 1987, 16, 893−901). We compare the model results with new and existing experimental data and with commercially available simulators. Our model reproduces the experimental data within 2−6% using one adjustable parameter, indicating that the predictions of the model are equal to or superior to the commercially available simulators.

Calculation of vapor–liquid equilibrium and PVTx properties of geological fluid system with SAFT-LJ EOS including multi-polar contribution. Part III. Extension to water–light hydrocarbons systems

“…Fig. 1 compares the calculation of this model for water content in CH 4 -rich vapor phase (y H 2 O ) with the experimental data covering a wide P-T range, including the data reported by Olds et al (1942), Sultanov et al (1972), Yarrison et al (2006), and Tabasinejad et al (2011a). It can be seen that this model can represent these experimental data sets with high accuracy.…”

“…Among the experimental data for the vapor-liquid equilibria of the H 2 O-C 2 H 6 system, the ethane solubility data measured by and the water content data measured by Reamer et al (1943) and Yarrison et al (2006) cover larger P-T range. Fig.…”

Mutual solubilities of hydrocarbons and water with the CPA EoS

“…For light n-alkanes, from methane to butane, an extensive experimental database for the mutual solubilities of these systems is available in a large range of temperature (298.15-573.15 K) and pressure (0.1-200 MPa) [41][42][43][44][45][46][47][48][49][50][51][52][53][54]. To provide a good description of these experimental data, for each system a single, temperature independent, binary interaction parameter was required.…”

Modelling of phase equilibria in CH4–C2H6–C3H8–nC4H10–NaCl–H2O systems

“…Most of the data are reproduced by the model except for some in the low temperature and pressure region in which the absolute solubility is very low and cannot be easily determined (Table 6). Figure 2 (c) shows the comparison of H 2 O solubilities in the C 2 H 6 -rich phase (H 2 O-C 2 H 6 system) at different temperatures and pressures by this model and the experimental data (Yarrison et al, 2006). Most of the H 2 O solubility experimental data can be predicted by the model (the experimental data were not used for parameterization).…”

“…(b) C 2 H 6 solubilities in NaCl solutions varying with NaCl molality at 1 atm and different temperatures: lines are calculated by this model and symbols are experimental data from Mishnina et al (1961). (c) H 2 O solubilities in C 2 H 6 -rich phase varying with pressure at different temperatures: lines are calculated by this model and symbols are experimental data from Yarrison et al (2006).…”