Solubility measurement and modeling for the system propane-water from 277.62 to 368.16 K (original) (raw)
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Solubility of Methane, Ethane, and Propane in Pure Water Using New Binary Interaction Parameters
Iranian Journal of Oil and Gas Science and Technology, 2015
Solubility of hydrocarbons in water is important du e to ecological concerns and new restrictions on the existence of organic pollutants in water stream s. Also, the creation of a thermodynamic model has required an advanced study of the phase equilibrium between water (as a basis for the widest spread muds and amines) and gas hydrocarbon phases in wide temperature and pressure ranges. Therefore, it is of great interest to develop semi-empirical corr elations, charts, or thermodynamic models for estimating the solubility of hydrocarbons in liquid water. In this work, a thermodynamic model based on Mathias modification of Sova-Redlich-Kwong (SRK) equation of state is suggested using classical mixing rules with new binary interaction parameters which were used for two-component systems of hydrocarbons and water. Finally, the model results and their deviations in comparison with the experimental data are presented; these deviations w ere equal to 5.27, 6.06, and 4.1% for methane, ethan...
The Saturated Water Content of Liquid Propane in Equilibrium with the sII Hydrate
Energies
In order to prevent solids from forming during the transportation and handling of liquid propane, C3H8(l), the fluid is dehydrated to a level below the water dew point concentration for the coldest operating temperature. Thus, accurate calculation of the saturation water content for C3H8 is important to determine the designed allowable concentration in liquid C3H8. In this work, we measured the water content of liquid C3H8 in the presence of the structure II hydrate from p = 1.081 to 40.064 MPa and T = 241.95 to 276.11 K using a tunable diode absorption spectroscopy technique. The water content results were modelled using the reference quality reduced Helmholtz equations and the Sloan et al. model for the non-hydrate and hydrate phases, respectively. Calculations show a good agreement (an average difference of less than 12 ppm) when compared to our measurements. Furthermore, the model was also used for calculating the dissociation temperatures for three phase loci, where a relative ...
Industrial & Engineering Chemistry Research, 2004
In this paper, new experimental data on the solubility of gaseous ethane in water are reported in the 274.26-343.08 K temperature range for pressures up to 4.952 MPa. A static-analytic apparatus, taking advantage of a pneumatic capillary sampler, is used for fluid sampling. The Valderrama modification of the Patel-Teja equation of state, combined with non-densitydependent mixing rules, is used for modeling the vapor-liquid equilibrium. The new solubility data generated in this work are used for tuning of the binary interaction parameters between ethane and water. Then, these data are compared with some literature data and the results of the thermodynamic model. To further evaluate the performance of the model, a comparison is made between the predicted water content data and some experimental data in the literature. These comparisons show the reliability of the techniques and model presented in this work.
Journal of Chemical & Engineering Data, 2010
P, x) vapor-liquid equilibrium (VLE) data for the (O 2 + C 3 H 8 ) binary system were measured using a "static-analytic" method coupled to a gas chromatograph analysis at temperatures of (110.22, 120.13, 130.58, and 139.95) K. Parameters of a proposed thermodynamic profile were adjusted on the basis of experimental VLE data determined in this work, allowing a complete isothermal phase diagram for this hazardous system to be obtained. The vapor-liquid-liquid equilibrium (VLLE) thermodynamic behavior was predicted by modeling and then confirmed by visual observations. On the basis of this work, solubility values of propane in liquid oxygen can be deduced for both the propane-lean and propane-rich liquid phases at temperatures above the melting temperature of pure propane. The device allowing these data to be measured for such a hazardous mixture is also presented, as are the accuracies of the measurements. † Part of the "Sir John S. Rowlinson Festschrift".
Fluid Phase Equilibria, 2002
Isothermal vapor-liquid equilibrium (VLE) data for the propane + 1,1,1,2,3,3,3-heptafluoropropane (R227ea) binary system were measured at 293. 16, 303.14, 313.14, 333.15, 343.16 and 353.18 K and pressures up to 3.5 MPa. The experimental method, used in this work, is of the static-analytic type. It takes advantage of two pneumatic capillary samplers (Rolsi TM , Armines' patent) developed in the Cenerg/TEP laboratory. The peculiarity of R227ea-propane binary system is to present azeotropic behavior at each studied temperature.
The Open Thermodynamics Journal, 2010
In this study, the liquid-liquid equilibria of the mixtures consisted of ethanol, water, and the main components of gasoline fuel: pentane, hexane, and cyclohexane were experimentally determined. This study is related to the phase behavior when water in atmosphere is absorbed into ethanol + gasoline fuel (gasohol) and then possibly separates into two liquid phases in an automobile fuel tank or an underground storage tank. The liquid-liquid equilibria in this study include three ternary systems: ethanol + water + pentane, ethanol + water + hexane, and ethanol + water + cyclohexane; three quaternary systems: ethanol + water + pentane + hexane, ethanol + water + pentane + cyclohexane, and ethanol + water + hexane + cyclohexane; one quinary system: ethanol + water + pentane + hexane + cyclohexane. The present experiments were conducted at 293.15, 303.15, and 308.15 K, and the experimental data were collected and some were compared to that available in literature, and finally all data were correlated with the UNIQUAC activity coefficient model.
Fluid Phase Equilibria, 2003
This project involves new solubility measurements of the water distribution in vapor of the methane/water binary system near the hydrate formation conditions. Isothermal vapor-liquid and vapor-hydrate equilibrium data of the vapor phase for the methane/water binary system were measured at 283. 08, 288.11, 293.11, 298.11, 303.12, 308.11, 313.12 and 318.12 K and pressures up to 35 MPa. In this work a static-analytic apparatus taking advantage of a pneumatic capillary sampler (Rolsi TM , Armines' patent) developed in the Cenerg/TEP laboratory is combined with an exponential dilutor. The results are compared with literature data. The eight sets of isothermal P, y data are represented with the Peng-Robinson equation of state (PR EoS) using the Trebble-Bishnoi alpha function, the classical mixing rules for the vapor phase and a Henry's law approach to treat the aqueous phase. The water phase distribution at hydrate forming conditions was calculated by using the Van der Waals and Platteeuw Model.
The Open Thermodynamics Journal, 2010
In this study, the liquid-liquid equilibria of the mixtures consisted of ethanol, water, and the main components of gasoline fuel: pentane, hexane, and cyclohexane were experimentally determined. This study is related to the phase behavior when water in atmosphere is absorbed into ethanol + gasoline fuel (gasohol) and then possibly separates into two liquid phases in an automobile fuel tank or an underground storage tank. The liquid-liquid equilibria in this study include three ternary systems: ethanol + water + pentane, ethanol + water + hexane, and ethanol + water + cyclohexane; three quaternary systems: ethanol + water + pentane + hexane, ethanol + water + pentane + cyclohexane, and ethanol + water + hexane + cyclohexane; one quinary system: ethanol + water + pentane + hexane + cyclohexane. The present experiments were conducted at 293.15, 303.15, and 308.15 K, and the experimental data were collected and some were compared to that available in literature, and finally all data were correlated with the UNIQUAC activity coefficient model.
Thermodynamic Property Model of Wide-Fluid Phase Propane
ITB J. Eng. Sci. Vol. 39 B, No. 1 43-65, 2007
A new thermodynamic property model for propane is expressed in form of the Helmholtz free energy function. It consists of eight terms of the ideal-gas part and eighteen terms of the residual part. Accurate experimental data of fluid properties and theoretical approach from the intermolecular potential were simultaneously considered in the development to insure accuracy and to improve reliability of the equation of state over wide range of pressures and temperatures. Based on the state range of experimental data used in the model development, the validity range is judged from the triple-point of 85.48 K to temperature of 450 K and pressure up to 60 MPa. The uncertainties with respect to different properties are estimated to be 0.03% in ideal-gas isobaric specific heat, 0.2% in liquid phase density, 0.3% in gaseous phase density 1% in specific heats, 0.1% in vapor-pressure except at very low temperatures, 0.05% in saturated-liquid density, 0.02% in speed of sound of the gaseous phase and 1% in speed of sound of the liquid phase.