Mass transfer enhancement in supercritical fluid extraction by acoustic waves

Hasan, Nusair; Farouk, Bakhtier

doi:10.1016/j.supflu.2013.04.002

Cited by 21 publications

(11 citation statements)

References 45 publications

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“…This gap could be reduced by acting on different process parameters such as temperature and addition of a stirring device to enhance plant material-liquefied gas contacting. Kinetic limitation due to a slow mass transfer has been reported for compressed fluid processes such as supercritical CO 2 even if the continuous circulation of CO 2 throughout the matrix generates a stirring (Hasan & Farouk, 2013).…”

Section: Qualitative and Quantitative Comparison Of Extracts From Drimentioning

confidence: 99%

An original approach for lipophilic natural products extraction: Use of liquefied n-butane as alternative solvent to n-hexane

Rapinel

Rombaut

Rakotomanomana

et al. 2017

LWT - Food Science and Technology

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Section: Qualitative and Quantitative Comparison Of Extracts From Drimentioning

confidence: 99%

An original approach for lipophilic natural products extraction: Use of liquefied n-butane as alternative solvent to n-hexane

Rapinel

Rombaut

Rakotomanomana

et al. 2017

LWT - Food Science and Technology

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“…It is also important to mention that the reported studies, in general, still use a co‐solvent (even if in small quantities). The phenomena that occurs during ultrasound‐assisted supercritical extraction is not yet well understood, and therefore some numerical studies have been carried out to simulate and predict the behavior during the supercritical extraction process, when coupled to ultrasound , .…”

Section: Introductionmentioning

confidence: 99%

Application of Ultrasound‐Assisted Supercritical Extraction to Soil Remediation

et al. 2017

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The coupling of ultrasound to supercritical extraction with carbon dioxide has been evaluated as a green remediation technique for soils contaminated with pesticides. The study used samples of soil spiked with atrazine, an organophosphate and contaminant of widespread use. The influence of the operating temperature and pressure on the extraction of atrazine was studied. The extraction of atrazine was enhanced with the use of ultrasound relative to the results obtained from conventional supercritical extraction. This study, operated in semi-continuous mode, demonstrates the possibility of increasing the yield of supercritical extraction by coupling with ultrasound instead of adding co-solvents, which is a greener alternative for removing contaminants such as pesticides from soil matrices.

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“…1,2 The successful electrodeposition of Cu, Ag, Ge and other metals and semiconductors 3-7 on flat substrates and the production of 3 nm Cu wires in silica templates 8 either from supercritical CO 2 /CH 3 CN mixtures or from supercritical hydrofluorocarbons (HFCs) has recently been demonstrated. Electrodeposition from SCFs requires appropriately designed precursors and a carefully chosen supporting electrolyte that is sufficiently soluble and dissociated in the SCF.…”

Section: Introductionmentioning

confidence: 99%

Phase behaviour and conductivity of supporting electrolytes in supercritical difluoromethane and 1,1-difluoroethane

Han

Suleiman

et al. 2016

Phys. Chem. Chem. Phys.

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We present investigations into a variety of supporting electrolytes and supercritical fluids probing the phase and conductivity behaviour of these systems and show that they not only provide sufficient electrical conductivity for an electrodeposition bath, but match the requirements imposed by the different precursors and process parameters, e.g. increased temperature, for potential deposition experiments. The two supercritical fluids that have been explored in this study are difluoromethane (CH2F2) and 1,1-difluoroethane (CHF2CH3). For CH2F2, the phase behaviour and electrical conductivity of eight ionic compounds have been studied. Each compound consists of a cation and an anion from the selected candidates i.e. tetramethylammonium ([N(CH3)4](+)), tetrabutylammonium ([N((n)C4H9)4](+)), 1-ethyl-3-methylimidazolium ([EMIM](+)) and 1-butyl-3-methylimidazolium ([BMIM](+)) for cations, and tetrakis(perfluoro-tert-butoxy)aluminate ([Al(OC(CF3)3)4](-)), chloride (Cl(-)), trifluoromethyl sulfonimide ([NTf2](-)) and tris(pentafluoroethyl)trifluorophosphate ([FAP](-)) for anions. For CHF2CH3, [N((n)C4H9)4][BF4] and [N((n)C4H9)4][B{3,5-C6H3(CF3)2}4] have been investigated for comparison with the previously measured solubility and conductivity in CH2F2. We have found that [N((n)C4H9)4][Al(OC(CF3)3)4], [N((n)C4H9)4][FAP] and [N(CH3)4][FAP] have much higher molar conductivity in scCH2F2 at similar conditions than [N((n)C4H9)4][BF4], a widely used commercial electrolyte. Additionally, scCHF2CH3 shows potential for use as the solvent for supercritical fluid electrodeposition, especially at high temperatures since high density of this fluid can be achieved at lower operating pressures than similar fluids that can be used to produce electrochemical baths with comparable conductivity.

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Mass transfer enhancement in supercritical fluid extraction by acoustic waves

Cited by 21 publications

References 45 publications

An original approach for lipophilic natural products extraction: Use of liquefied n-butane as alternative solvent to n-hexane

An original approach for lipophilic natural products extraction: Use of liquefied n-butane as alternative solvent to n-hexane

Application of Ultrasound‐Assisted Supercritical Extraction to Soil Remediation

Phase behaviour and conductivity of supporting electrolytes in supercritical difluoromethane and 1,1-difluoroethane

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