Regeneration of loaded supercritical fluids

Birtigh, Andreas; Brunner, Gerd

doi:10.1016/s0896-8446(96)90053-4

Cited by 19 publications

(4 citation statements)

References 7 publications

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“…In 1995, an inorganic membrane, which has a high compressible strength, thermal stability, and solvent resistance, was utilized to separate the low volatile compounds (LVC) extracted into sc-CO 2 , by Biritgh. 21 As a result of this study, 80-90% of LVC was recovered by a nanofiltration membrane without a significant drop in pressure. Also, regeneration with the inorganic membrane could be established as being ideal for matching with the inorganic membrane; that is, silica, which is one type of material used for membranes, has a low affinity for hydrophobic compounds.…”

Section: Introductionmentioning

confidence: 70%

“…The pressure of permeation and retention is minutely regulated by the actuator valves (16,17). The total flow of permeation and retention is measured by gas meters (21,22).…”

Section: Methodsmentioning

confidence: 99%

“…The ethanol rejection could be 70% higher than the best result obtained in sc-CO 2 . In 1995, an inorganic membrane, which has a high compressible strength, thermal stability, and solvent resistance, was utilized to separate the low volatile compounds (LVC) extracted into sc-CO 2 , by Biritgh . As a result of this study, 80−90% of LVC was recovered by a nanofiltration membrane without a significant drop in pressure.…”

Section: Introductionmentioning

confidence: 99%

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Continuous Supercritical CO₂ Process using Nanofiltration by Inorganic Membrane

Koh¹,

Fournel²,

Sarrade³

et al. 2009

Ind. Eng. Chem. Res.

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Nanofiltration using inorganic membranes was conducted to develop a continuous process in supercritical CO 2 . Inorganic membranes of various sizes (1, 5, 50, 300 kDa), materials (Al 2 O 3 /TiO 2 /ZrO 2 , Al 2 O 3 /ZrO 2 / TiO 2 ), and modules (one and three channels) were used for the experiments. The effects of fluid viscosity and density, membrane active layer thickness, number of channels, pore size, and the flux of a fluid were analyzed when supercritical CO 2 (sc-CO 2 ) passed through the membrane. In the case of PE6100 surfactant, it was confirmed that sc-CO 2 passed through the membrane at a flow rate and transmembrane pressure (∆P) greater than 10 mL/min and 0.04 MPa, respectively, although the size of the surfactant was larger than that of the membrane pore. The phenomena were proven to have been caused by the folding effect. In the case of microemulsions using NP-4 and H 2 O, it was confirmed that water adsorbed on the membrane surface passed through at ∆P greater than 0.7 MPa. Based on these findings, experiments were conducted to separate microemulsions and dispersions. The experimental results indicated that microemulsions achieved 47% separation efficiency and 90% surfactant recovery efficiency due to the displacement of metal ions through the water adsorbed on the membrane surface. Conversely, dispersions yielded high separation efficiency. Also, the correlation between the contaminant size and the membrane pore size was confirmed through SEM images.

show abstract

Section: Introductionmentioning

confidence: 70%

“…The pressure of permeation and retention is minutely regulated by the actuator valves (16,17). The total flow of permeation and retention is measured by gas meters (21,22).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Continuous Supercritical CO₂ Process using Nanofiltration by Inorganic Membrane

Koh¹,

Fournel²,

Sarrade³

et al. 2009

Ind. Eng. Chem. Res.

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show abstract

“…Birtigh and Brunner [6] studied different regeneration methods for loaded supercritical fluids. Several publications and patents are available on the regeneration of supercritical fluids with porous and microporous membranes such as for the separation of caffeine from supercritical carbon dioxide [7][8][9].…”

Section: Introductionmentioning

confidence: 99%