Diffusion Coefficients in Hydrocarbon Systems. Methane in the Liquid Phase of the Methane-Cyclohexane System.

Reamer, H. H.; Sage, B. H.

doi:10.1021/je60004a003

Cited by 15 publications

(17 citation statements)

References 11 publications

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“…To validate the proposed method in this paper, the experimental data obtained by Reamer and Sage , are used to estimate diffusion coefficient ( D ) and interface mass transfer coefficient ( k int ). The experimental data by Reamer and Sage are provided in the supplemental file.…”

Section: Results and Discussionmentioning

confidence: 99%

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Determination of Mass Transfer Coefficient of Methane in Heavy Oil-Saturated Unconsolidated Porous Media Using Constant-Pressure Technique

Yang

Dong

Gong

et al. 2017

Ind. Eng. Chem. Res.

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Measuring the solubility and diffusivity of methane in porous media saturated with oil is critical for analyzing the process of solvent-based recovery of heavy oil reservoir. In this study, a modified pressure-pulse decay (PPD) method is presented to measure the mass transfer coefficients of methane in porous media saturated with heavy oil as well as the solubility and diffusivity of methane in bulk oil under the same experimental conditions as those used in a comparison. The experiments are conducted under constant boundary pressure in a PVT cell, and the pressure is controlled using an auto pump, which continuously compresses the volume of an intermediate container. The accumulated volume change instead of the pressure change is recorded with time. The nonequilibrium boundary condition (BC) model is used to analyze the experimental process. The general solution of the mathematical model is derived using the Laplace transform and the approximate analytical solution of the accumulated dissolved gas is further presented for post processing of the experimental data. The mass transfer coefficients are estimated through using a multilevel single-linkage (MLSL) method to match the approximate solution with the recorded experimental data. The estimation of the parameters shows that the mass transfer coefficients are pressure dependent and that a high boundary pressure contributes to the mass transfer of methane in heavy oil due to a reduction in viscosity or density. The interface mass transfer coefficient (k int ) and interface saturated concentration (c int ) in porous media saturated with oil and bulk oil are almost the same under the same experimental conditions. The sensitivity analysis shows that the increase of the effective diffusion coefficient (D eff ) and k int contributes to enhancing the rate of mass transfer in the oil phase and that Henry's law constant (H) has no effect on the equilibrium time but only affects the initial saturated concentration at the interface or the total dissolved gas. The modified PPD method is robust, efficient, and easy to use in the laboratory.

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Section: Results and Discussionmentioning

confidence: 99%

“…The experimental data by Reamer and Sage are provided in the supplemental file. In their experiments, they studied the diffusion processes of methane in propane and in cyclohexane . They determined the diffusion coefficients through direct method .…”

Section: Results and Discussionmentioning

confidence: 99%

Determination of Mass Transfer Coefficient of Methane in Heavy Oil-Saturated Unconsolidated Porous Media Using Constant-Pressure Technique

Yang

Dong

Gong

et al. 2017

Ind. Eng. Chem. Res.

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“…This pressure difference can sometimes be sufficient to change the nature of an entire experiment from constant pressure to pressure‐decay. It is worth noting that despite all these challenges, this method has proved to be the most practical among others, as it has the most significant contribution in producing diffusional data sets available in the literature for systems of gaseous n ‐alkanes and liquid hydrocarbons through methodologies in which the pressure in the gas cap was manually regulated by the operator. In this study, therefore, a novel and fully automated experimental setup was designed, fabricated, and validated for measuring the concentration‐dependent diffusion coefficient of gaseous solvents in liquid solutes, using both tracking of the gas/liquid interface and rate of mass transfer required for maintaining the pressure inside the gas cap.…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

“…In the constant pressure method, the pressure in the diffusion cell is maintained through continuous supply and replenishment of the gas diffusing through the gas/liquid interface. The method has proven to be both reliable and practical as it is implemented for measurements of the majority of the diffusional data sets for various systems of gases and hydrocarbon liquid systems . Experiments of constant pressure nature are straightforward and involve simpler and more realistic boundary conditions compared to the more common pressure‐decay experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In the early work of Pomeroy et al, for systems of isobutane in high‐boiling gasoline fractions, the pressure was maintained manually, as practicable, while incorporating the liquid swelling that was independently quantified using a change‐of‐volume apparatus. Later, Reamer and Sage adopted this technique by developing an experimental setup conceptually similar to Pomeroy et al's and incorporating a correction term for the interface velocity based on concentrations and partial specific volumes of the component. Renner later extended the scope to diffusivity measurements within consolidated Berea sandstone for which they considered the liquid swelling as a correction factor calculated using the volumetric and phase‐behavior data.…”

Section: Introductionmentioning

confidence: 99%

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Concentration‐dependent molecular diffusion coefficient of gaseous ethane in liquid toluene

et al. 2020

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We report new experimental data on concentration-dependent molecular diffusion coefficient of ethane in toluene at temperatures ranging from 21 to 125 C and pressures up to 4.14 MPa. An analytical model has also been developed for estimation of the diffusion coefficient utilizing the experimental data of the interface velocity as a result of swelling and the rate of gas dissolution in the liquid phase. It is shown that the diffusion coefficient of ethane in toluene is dependent on the initial mass fraction of the gaseous component in the liquid. In addition, the effect of concentration dependency of the molecular diffusion coefficient on diffusive mass flux is quantified.The results reveal that the assumption of a constant diffusion coefficient introduces 10-60% error in calculation of diffusional mass transfer flux. The developed methodology finds application in estimation of the concentration-dependent molecular diffusion coefficient of gases in liquids.

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Diffusion

Andrussow¹,

Schramm²,

Schäfer³

2013

Eigenschaften Der Materie in Ihren Aggregatzuständen

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Diffusion Coefficients in Hydrocarbon Systems. Methane in the Liquid Phase of the Methane-Cyclohexane System.

Cited by 15 publications

References 11 publications

Determination of Mass Transfer Coefficient of Methane in Heavy Oil-Saturated Unconsolidated Porous Media Using Constant-Pressure Technique

Determination of Mass Transfer Coefficient of Methane in Heavy Oil-Saturated Unconsolidated Porous Media Using Constant-Pressure Technique

Concentration‐dependent molecular diffusion coefficient of gaseous ethane in liquid toluene

Diffusion

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