Measurement of static dielectric constants of supercritical fluid solvents and cosolvents: Carbon dioxide and argon, carbon dioxide, and methanol at 323 K and pressures to 25 MPa

Drake, Bruce D.; Smith, Richard L.

doi:10.1016/0896-8446(90)90018-h

Cited by 28 publications

(10 citation statements)

References 23 publications

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“…Chafer et al (2007) report the increase of the solubility of gallic acid in scCO 2 when the pressure increases. The solubility of different types of compounds increases with pressure since the density of the supercritical fluid increases (Drake and Smith, 1990). Moreover, the natural presence of ethanol in red wine could improve the extractability of phenolic compounds in this case.…”

Section: Extraction Performancementioning

confidence: 99%

Red Wine Extract Obtained by Membrane-Based Supercritical Fluid Extraction: Preliminary Characterization of Chemical Properties.

Silva

Romero

Morales

et al. 2017

Braz. J. Chem. Eng.

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-This study aims to obtain an extract from red wine by using membrane-based supercritical fluid extraction. This technique involves the use of porous membranes as contactors during the dense gas extraction process from liquid matrices. In this work, a Cabernet Sauvignon wine extract was obtained from supercritical fluid extraction using pressurized carbon dioxide as solvent and a hollow fiber contactor as extraction setup. The process was continuously conducted at pressures between 12 and 18 MPa and temperatures ranged from 30 to 50ºC. Meanwhile, flow rates of feed wine and supercritical CO 2 varied from 0.1 to 0.5 mL min -1 and from 60 to 80 mL min -1 (NCPT), respectively. From extraction assays, the highest extraction percentage value obtained from the total amount of phenolic compounds was 14% in only one extraction step at 18MPa and 35ºC. A summarized chemical characterization of the obtained extract is reported in this work; one of the main compounds in this extract could be a low molecular weight organic acid with aromatic structure and methyl and carboxyl groups. Finally, this preliminary characterization of this extract shows a remarkable ORAC value equal to 101737 ± 5324 µmol Trolox equivalents (TE) per 100 g of extract.

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Section: Extraction Performancementioning

confidence: 99%

Red Wine Extract Obtained by Membrane-Based Supercritical Fluid Extraction: Preliminary Characterization of Chemical Properties.

Silva

Romero

Morales

et al. 2017

Braz. J. Chem. Eng.

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“…4 Deul and Franck investigated the water-benzene system at both high temperatures and high pressures. 5 Drake and Smith investigated the dielectric behavior of the CO2-argon system and the CO2-methanol system at low methanol mole fractions. Dombro et al 6 reported on the dielectric behavior of mixtures of carbon dioxide and methanol in the liquid and mixture-critical regions at 90 to 115°C and pressures to 240 bar.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and thermodynamic study of Carbon dioxide (CO$_2$) - methanol (CH$_3$OH) mixture

Fuentes-Azcatl¹,

Domínguez²

2022

Preprint

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In this paper is calculated and analyzed the dielectric behavior of carbon dioxidemethanol mixture and evaluate how the correct reproduction of the electrical properties of carbon dioxide and methanol influences the mixture of these two molecules. A comparison of two carbon dioxide models and three methanol models is made, where the CO 2 /ǫ model reproduces and improves the dielectric constant and for the methanol the TraPPE 2015 and MeOH-4P models improve the dielectric constant ǫ, the surface tension γ , and the liquid density ρ of the pure liquid at T=298.15 K and p=1 bar.

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“…The dielectric permittivity of supercritical fluids is small and diminishes with increasing temperatures, but at a given temperature increases with the pressure, i.e., the density. Near the critical point the static permittivity ε 0 = 8.6 for water [1], 4.8 for methanol [6], and 1.3 for carbon dioxide [7]. The cohesive energy densities and their square roots, i.e., the total (Hildebrand) solubility parameters, as well as the partial (Hansen) solubility parameters of the supercritical fluids are shown in Table 2 as near the reduced temperature T r = T/T c = 1.1 and pressure P r = P/P c = 1.1 as data are available.…”

Section: Introductionmentioning

confidence: 99%

Some Advances in Supercritical Fluid Extraction for Fuels, Bio-Materials and Purification

Marcus

2019

Processes

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Supercritical fluids are used for the extraction of desired ingredients from natural materials, but also for the removal of undesired and harmful ingredients. In this paper, the pertinent physical and chemical properties of supercritical water, methanol, ethanol, carbon dioxide, and their mixtures are provided. The methodologies used with supercritical fluid extraction are briefly dealt with. Advances in the application of supercritical extraction to fuels, the gaining of antioxidants and other useful items from biomass, the removal of undesired ingredients or contaminants, and the preparation of nanosized particles of drugs are described.

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Measurement of static dielectric constants of supercritical fluid solvents and cosolvents: Carbon dioxide and argon, carbon dioxide, and methanol at 323 K and pressures to 25 MPa

Cited by 28 publications

References 23 publications

Red Wine Extract Obtained by Membrane-Based Supercritical Fluid Extraction: Preliminary Characterization of Chemical Properties.

Red Wine Extract Obtained by Membrane-Based Supercritical Fluid Extraction: Preliminary Characterization of Chemical Properties.

Dielectric and thermodynamic study of Carbon dioxide (CO$_2$) - methanol (CH$_3$OH) mixture

Some Advances in Supercritical Fluid Extraction for Fuels, Bio-Materials and Purification

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