The Measurement of High Pressure Vapour‐Liquid‐Equilibria: Part I: Dynamic Methods

Raal, J. David; Mühlbauer, A. L.

doi:10.1002/apj.5500020201

Cited by 7 publications

(6 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, synthetic methods aim to observe phase behavior of a system of known feed composition so that the difficulties of analyzing phase compositions is substituted by the problem of preparing (synthesizing) the global system and observing its phase behavior directly or indirectly. In addition, Raal and Mühlbauer , proposed to distinguish between static and dynamic methods depending on whether liquid, vapor, or both phases flow through the equilibrium cells.…”

Section: Introductionmentioning

confidence: 99%

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO₂–Crude Oil Systems under High Pressure

et al. 2020

View full text Add to dashboard Cite

An efficient strategy for developing a petroleum reservoir as well as designing a robust production system depends on the knowledge of the phase behavior of the fluids to be produced. Enhanced oil recovery projects, such as CO 2 flooding, are even more critical as their efficiency is strictly related to the fluid's phase behavior in response to the added gas. Nevertheless, studies able to assess the complete phase behavior diagram for CO 2 −crude oil mixtures are scarce. Among the main reasons, one can point out the unavailability of an experimental method able to investigate such complex systems. To overcome such a challenge, the development of an experimental setup able to determine fluid phase transitions and heavy organic solids formation in opaque oils in reservoir conditions is presented. The use of a new visualization system in combination with a recently developed acoustic wave sensor offers full external scrutiny of fluid samples under high-pressure conditions. The use of a charge coupled device that works in the short wavelength infrared range allows a direct observation of the transformations occurring in the system while the external parameters are changed. It reduces the study of dark oil to the convenient investigation of transparent fluids. The study of three different CO 2 −crude oil systems demonstrates that by taking advantage of the complementarity of the QCR setup and opaque visibility setup, it is possible to investigate the full phase diagram of dark oil systems.

show abstract

Section: Introductionmentioning

confidence: 99%

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO₂–Crude Oil Systems under High Pressure

et al. 2020

View full text Add to dashboard Cite

show abstract

“…From many studies it is known that minor concentrations of dissolved air in the solvent could highly affect the bubble-point pressures, especially for low gas concentrations. 16 Although evidence is missing for our assumption, the observed trend is characteristic for air contamination. Since no experimental data of the system DEMP þ CH 4 system have been reported in literature, no comparison could be made.…”

Section: ' Results and Discussionmentioning

confidence: 83%

Experimental Determination of the Solubilities of CO₂ and CH₄ in Diethyl Methylphosphonate

2011

View full text Add to dashboard Cite

The phase behavior of the binary systems consisting of the organic solvent diethyl methylphosphonate (DEMP) and the gases carbon dioxide (CO 2 ) and methane (CH 4 ) is experimentally studied. A synthetic method is used to measure the solubilities. Bubble-point pressures of the system DEMP þ CO 2 are reported for CO 2 concentrations ranging from (15.40 to 86.44) mole % and within a temperature range of (283.4 to 338.1) K and compared to the limited experimental data in the literature. Also, bubble-point pressures of the system DEMP þ CH 4 are reported for CH 4 concentrations ranging from (5.17 to 15.30) mole % and within a temperature range of (283.2 to 358.5) K, which have never been measured before. The solubilities of CH 4 are much lower than the solubilities of CO 2 in DEMP. Moreover, the temperature has a much larger influence on the CO 2 solubility in DEMP compared to the effect of temperature on the CH 4 solubility. ' INTRODUCTIONSolvent selection is an important task to improve and optimize many industrial processes, particularly for chemical process industries where solvents are involved in many process steps, such as the separation of gases, liquids, and solids, reaction processes, washing, and so forth. To evaluate and select the optimal solvent for any specific application, it is possible to rely on chemical information of compounds, such as acidÀbase properties, 1 hydrogen bonding capabilities, polarity, 2 and so forth. Also, health and safety characteristics must be considered during the solvent selection, and in some cases even heuristic approaches 3 have been used for this purpose. However, this information is only useful to describe general trends, and it is not suitable for obtaining relevant thermodynamic data for solvent separation processes, such as solubilities, selectivities, distribution coefficients, and energy requirements.The use of predictive equations of state based on group contribution methods, 4 statistical thermodynamics, 5 or quantum mechanics 6 are good alternatives to evaluate and compare thermodynamic properties of different solvents. 7 Group contribution methods, including the unified functional activity coefficient model (UNIFAC) 8 for low pressure systems and the group contribution equation of state (GC-EoS) developed by SkjoldJørgensen 9 for a wider range of processing conditions, are suitable to predict thermodynamic properties of solvents when their molecular structures share functional groups. Furthermore, if enough group information is available, these methods can be used as designer tools to "build" new and optimal solvents.Phosphonate-based compounds, which are applied in industrial processes as chelating agents 10 and in pharmaceutical applications as pretreatment drugs for bone-related diseases 11 or as antiviral and as anticarcinogenic agents, 12 are not described by the groups available in the GC-EoS. In addition, the phase equilibria data in literature to obtain the equation of state parameters for the phosphonate group are scarce. As far as the authors know, the...

show abstract

“…To shorten the equilibration time, the contents of the equilibrium cell are often agitated. In the static method liquid and vapor phase samples are often drawn and analyzed using gas chromatography to determine phase compositions [8]. Another variation of the static method is the static total pressure method, where known amounts of components are added into the equilibrium cell and the total equilibrium pressure of the system is recorded for a given temperature.…”

Section: Static Methodsmentioning

confidence: 99%

“…These experimental techniques have been thoroughly reviewed in the literature [8][9][10], and therefore in this paper these techniques will be only briefly discussed to help the reader better understand and appreciate the data that will be reviewed in detail in the following sections.…”

Section: Experimental Techniques For Vle Measurementmentioning

confidence: 99%

Review of vapor-liquid equilibria of gas hydrate formers and phase equilibria of hydrates

Khan

Warrier

Peters³

et al. 2016

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

The Measurement of High Pressure Vapour‐Liquid‐Equilibria: Part I: Dynamic Methods

Cited by 7 publications

References 48 publications

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO₂–Crude Oil Systems under High Pressure

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO₂–Crude Oil Systems under High Pressure

Experimental Determination of the Solubilities of CO₂ and CH₄ in Diethyl Methylphosphonate

Review of vapor-liquid equilibria of gas hydrate formers and phase equilibria of hydrates

Contact Info

Product

Resources

About

The Measurement of High Pressure Vapour‐Liquid‐Equilibria: Part I: Dynamic Methods

Cited by 7 publications

References 48 publications

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO2–Crude Oil Systems under High Pressure

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO2–Crude Oil Systems under High Pressure

Experimental Determination of the Solubilities of CO2 and CH4 in Diethyl Methylphosphonate

Review of vapor-liquid equilibria of gas hydrate formers and phase equilibria of hydrates

Contact Info

Product

Resources

About

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO₂–Crude Oil Systems under High Pressure

Combined Investigations of Fluid Phase Equilibria and Fluid–Solid Phase Equilibria in Complex CO₂–Crude Oil Systems under High Pressure

Experimental Determination of the Solubilities of CO₂ and CH₄ in Diethyl Methylphosphonate