Mass transfer characteristics of gases in methanol and ethanol under elevated pressures and temperatures

Koneripalli, Nagraj; Tekie, Zeru; Morsi, Badie I.; Chang, Min-Yan

doi:10.1016/0923-0467(93)02816-f

Cited by 12 publications

(12 citation statements)

References 45 publications

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“…The viscosity of the liquids reduced with increasing temperature; thus, an increase in the mass transfer coefficient was expected. This increase in the mass transfer coefficient with an increase in the temperature was also observed for the absorption of gas into a liquid, likely as a result of decreasing viscosity. , …”

Section: Resultssupporting

confidence: 54%

“…This increase in the mass transfer coefficient with an increase in the temperature was also observed for the absorption of gas into a liquid, likely as a result of decreasing viscosity. 30,35 The values of t 1/2 with variation in the temperature are shown in Figure 8. The increase in the temperature reduces t 1/2 for all of the liquids.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Kinetics of Gas Evolution from Supersaturated Oils at Elevated Pressures and Temperatures

et al. 2020

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The design of gas–liquid separators is commonly based on the American Petroleum Institute (API) 12J guidelines. Although these guidelines have been useful, they may fail to provide sufficient time required for complete gas–liquid separation and may lead to problems, such as gas carry-under (GCU), in some cases. Therefore, an accurate understanding of gas evolution rates (volumetric mass transfer coefficient) from supersaturated solutions is critical. The objective of this work was to elucidate the influence of pressure and temperature on the rate of gas evolution from a supersaturated model oil (Exxsol D-110) and three crude oils (crude A, crude B, and crude C) of varying viscosities. The initial pressure was varied up to 10.45 MPa, keeping the temperature constant at 298.15 K. The increase in the initial saturation pressure showed that the volumetric mass transfer coefficient (gas evolution) of Exxsol D-110 and crude B (having the same viscosity) exhibited different trends. In contrast, crude A and crude C with different viscosities exhibited similar volumetric mass transfer coefficients. The effect of temperature was determined by varying the liquid temperature from 288.15 to 348.15 K at a constant initial saturation pressure of 3.45 MPa. The volumetric mass transfer coefficient increased with an increase in temperature. At similar viscosities, crude oils exhibited different volumetric mass transfer coefficients. On the basis of our experimental data, it was observed that the viscosity of the oils was not the only factor that affected gas evolution. For all cases considered in this work, the time required to evolve 50% of the gas was higher than the time estimated by the API 12J guidelines.

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Section: Resultssupporting

confidence: 54%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Kinetics of Gas Evolution from Supersaturated Oils at Elevated Pressures and Temperatures

et al. 2020

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“…(20). Instead, an increase in the CO 2 diffusion coefficients in the liquid phase, at each temperature and at each amine concentration, was observed when the methanol ratio was increased from 40% to 70% or in pure methanol, an effect explained due to the amine viscosity which also decreased.…”

Section: Diffusion Coefficientsmentioning

confidence: 83%

“…Methanol is widely used as an organic solvent in absorption processes (Rectisol and Amisol) [19], due to the high selectivity to H 2 S and the high CO 2 solubility [20], providing a high separation performance with lower energetic requirements in the regeneration step. On the other hand, cooling systems are required due to evaporation, involving higher operational and capital costs.…”

Section: Introductionmentioning

confidence: 99%

CO2 absorption into N-methyldiethanolamine aqueous-organic solvents

Tamajón

Álvarez

Cerdeira

et al. 2016

Chemical Engineering Journal

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“…20 They were compared with the data from open literature, 21,22 and the increase in the solubility in the presence of CO 2 was incorporated. Pressure Drop.…”

Section: Experimental Datamentioning

confidence: 99%

Modeling of Direct Synthesis of Hydrogen Peroxide in a Packed-Bed Reactor

Kilpiö

Biasi

Bittante

et al. 2012

Ind. Eng. Chem. Res.

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Direct synthesis of hydrogen peroxide from oxygen and hydrogen continues to be a research topic of high interest. It would be most desirable if this synthesis could be carried out in a continuous fixed-bed reactor in a safe way, with a catalyst providing both high selectivity and high productivity. This could significantly simplify the hydrogen peroxide production process and reduce both operating and investment costs. In the conventional anthraquinone-based production process, the hydrogenation and oxidation steps are carried out in separate reactors, and extraction is finally used for hydrogen peroxide recovery. Recirculation of large quantities of the multicomponent organic working solution takes place, and expensive filtration of the hydrogenation catalyst from this vast stream is required when a slurry reactor is used. The main benefit of the conventional process is that it is a well-proven and reliably operating technology. The most straightforward approach for the direct synthesis is to carry out the reaction between H 2 and O 2 on a heterogeneous catalyst, preferably Pd or Pd/Au catalyst, in a suitable solvent. Methanol is one of the most popular choices for the solvent because the solubilities of H 2 and O 2 in methanol are much larger than those in water. This article presents a modeling study for the direct synthesis of hydrogen peroxide with methanol as the solvent in a continuous three-phase reactor. The modeling study used data from an experimental study performed with a Pd/CeS catalyst in our laboratory reactor. The aim of the modeling was to provide insight into the physical and chemical phenomena occurring during the process. The reaction system was a challenging one, because both side reaction and decomposition reactions took place simultaneously with the highly desirable synthesis. The model was found to describe the experimental data from the fixed-bed reactor rather well. Particle diffusion was found to be most severe for the synthesis and oxidation reactions.

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Mass transfer characteristics of gases in methanol and ethanol under elevated pressures and temperatures

Cited by 12 publications

References 45 publications

Kinetics of Gas Evolution from Supersaturated Oils at Elevated Pressures and Temperatures

Kinetics of Gas Evolution from Supersaturated Oils at Elevated Pressures and Temperatures

CO2 absorption into N-methyldiethanolamine aqueous-organic solvents

Modeling of Direct Synthesis of Hydrogen Peroxide in a Packed-Bed Reactor

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