Impact of Supersaturation Ratio on the Kinetics of Gas Evolution at Elevated Pressures

Miranda, Michael Angelo; Subramani, Hariprasad J.; Aichele, Clint P.

doi:10.1021/acs.energyfuels.0c02400

Cited by 3 publications

(9 citation statements)

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“…The impact of chemical additives on the rate of gas evolution was investigated at an initial pressure of 6.98 MPa (318.15 K) and at two gas evolution mixing speeds (25 and 500 rpm), while solubilization was done at 500 rpm. The methodology to determine the moles of gas solubilized and evolved uses our previously established method. ,, The moles solubilized and evolved are based on a mole balance over the system. The moles of methane solubilized into and evolved from Exxsol D-110 are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…The experiment consisted of four stages, i.e., (1) initial pressurization, (2) absorption (solubilization), (3) depressurization, and (4) gas evolution. A detailed description of the experimental protocol, determination of the experimental uncertainty, and the volumetric mass transfer coefficient ( k L a ) have been published previously. ,, In this current work, the experimental temperature was maintained at 318.15 ± 0.5 K and the samples were initially pressurized to 6.98 ± 0.00689 MPa. Absorption was determined at 500 rpm, and gas evolution was determined at 25 and 500 rpm.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…experimental uncertainty, and the volumetric mass transfer coefficient (k L a) have been published previously. 22,24,26 In this current work, the experimental temperature was maintained at 318.15 ± 0.5 K and the samples were initially pressurized to 6.98 ± 0.00689 MPa. Absorption was determined at 500 rpm, and gas evolution was determined at 25 and 500 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of Exxsol D-110, the initial pressure did not significantly impact the rate of gas evolution. The impact of the supersaturation ratio on the rate of gas evolution from Exxsol D-110 showed that only above a supersaturation ratio of 2 was the gas evolution rate higher than the rate of absorption into Exxsol D-110 . The rate of gas evolution (desorption) was investigated using diesel and internal olefin solutions at various saturation pressures .…”

Section: Introductionmentioning

confidence: 99%

“…The impact of the supersaturation ratio on the rate of gas evolution from Exxsol D-110 showed that only above a supersaturation ratio of 2 was the gas evolution rate higher than the rate of absorption into Exxsol D-110. 24 The rate of gas evolution (desorption) was investigated using diesel and internal olefin solutions at various saturation pressures. 25 The impact of emulsion droplet size on the rate of gas evolution from waterin-oil emulsions has also been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Chemical Additives on Gas Evolution Behavior in Supersaturated Solutions at Elevated Pressures

et al. 2021

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There is a need to better understand the mechanisms that govern gas evolution (i.e., desorption) from supersaturated solutions at elevated pressures for improved design and troubleshooting of gas−liquid separators used in the oil and gas industry. The rate of gas evolution is generally represented in terms of the mass transfer coefficient, which can be affected by the presence of chemical additives. In the oil and gas industry, a wide variety of chemical additives are used, such as demulsifiers, antifoamers, and corrosion inhibitors. Two different classes of chemical additives were evaluated in this work, Xiameter PMX-200 (silicone-based) and Synperonic PE/L61 (alcohol-based). The rate of gas evolution (volumetric mass transfer coefficient) was determined at two different mixing speeds (25 and 500 rpm). The impact of the chemical additive concentration (Xiameter PMX-200) on the volumetric mass transfer coefficient was investigated using Exxsol D-110 (model oil) at different concentrations, while Synperonic PE/L61 (alcohol-based) was investigated only at a concentration of 80 ppm in Exxsol D-110. The effect of chemical additives in crude oils was also investigated using two crude oils (Crude A and B). For the measurements with crude oil, the concentration of Xiameter PMX-200 (silicone-based) was 10 ppm and that of Synperonic PE/L61 (alcohol-based) was 80 ppm. Results showed that the addition of chemical additives did not affect the number of moles of methane solubilized into the crude and model oils. However, the addition of chemical additives reduced the volumetric mass transfer coefficient during absorption and desorption into/ from the crude and model oils. Based on these data, we hypothesize that chemical additives can form a resistive layer (near the bulk liquid−gas interface), thereby causing a reduction in the volumetric mass transfer coefficient.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Chemical Additives on Gas Evolution Behavior in Supersaturated Solutions at Elevated Pressures

et al. 2021

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A Predictive Methodology to Determine the Rate of Gas Evolution in Hydrocarbon Systems at Elevated Pressures

et al. 2023

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The rate of gas evolution (volumetric mass transfer coefficient) is a critical parameter in understanding and predicting gas–liquid separation, especially in the energy industry. This work led to the development of an empirical correlation to determine the mass transfer coefficient based on the dead oil properties and energy dissipation. The approach was evaluated using published n-dodecane data. The empirical correlation was tested for model and crude oils using experimental data for the rate of gas evolution and absorption under varying levels of energy dissipation and from liquids of varying viscosities. The energy dissipated in the liquid was varied by changing the mixing speed from 25 to 500 rpm. The rate of gas evolution/absorption was measured using one model oil (Exxsol D-110) and three crude oils (crudes A, B, and C) of varying viscosities at elevated pressure (3.45 MPa) and at two different temperatures (298.15 and 348.15 K), while pure methane was used as the gas phase. The mass transfer coefficient determined for each liquid was correlated with an empirical equation based on the kinematic viscosity and energy dissipation, similar to the Lamont and Scott model. This work also evaluated the impact of inlet conditioning (multiple shear environments) on gas evolution. In gas–liquid separators, varying levels of energy dissipation are encountered. For example, high levels of energy are encountered in inlet conditioning devices, followed by lower levels of energy within the separator. Thus, the impact on the rate of gas evolution when an initial shear pulse (high energy dissipation) was applied prior to the gas evolution stage was investigated. The initial shear pulse increased the rate of gas evolution in all cases. This work provides an approach for estimating the rate of mass transfer in hydrocarbons, and it provides insight into cases where different levels of energy dissipation are experienced.

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Elucidating the Influence of Bubble Surface Area on Mass Transfer Kinetics in Gas/Liquid Systems

Ghosh,

Miranda,

Aichele

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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The separation of gas from liquid and the hydrodynamic phenomena that govern this behaviour has numerous engineering applications, particularly in the field of hydrocarbon separations where such information is critical for designing separation equipment. In these systems, liquid is typically super-saturated with a gas under pressure, and the rate at which this gas exits the liquid is needed in order to properly predict the residence time required for separation. Several physical parameters govern the separation behaviour including the presence of bubbles, surfactants, and emulsions. This presentation specifically addresses the role that bubble surface area plays in determining the mass transfer rate of gas exiting liquids. The influence of viscosity and surface tension are also explored in the context of bubble generation. An optical technique was developed and validated to determine bubble surface area using a highdefinition camera. By utilizing a unique experimental setup that facilitates the measurement of mass transfer rates at elevated pressures in conjunction with quantitative visual observations, data is obtained that reveals the connection between bubble surface area and mass transfer. Data will also be presented for systems that include surfactants, particles of varying wettability, and emulsions. The outcomes of this work will improve understanding of the processes that govern gas evolution in super-saturated conditions, thereby leading to improved designs that facilitate more efficient separation.

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Impact of Supersaturation Ratio on the Kinetics of Gas Evolution at Elevated Pressures

Cited by 3 publications

References 32 publications

Impact of Chemical Additives on Gas Evolution Behavior in Supersaturated Solutions at Elevated Pressures

Impact of Chemical Additives on Gas Evolution Behavior in Supersaturated Solutions at Elevated Pressures

A Predictive Methodology to Determine the Rate of Gas Evolution in Hydrocarbon Systems at Elevated Pressures

Elucidating the Influence of Bubble Surface Area on Mass Transfer Kinetics in Gas/Liquid Systems

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