Supercritical fluid extraction : technology, applications and limitations

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Isolation of dissolved solute by precipitation Eg. CO2 in vapour form is compressed into a liquid before becoming supercritical and then extraction takes place. Fluid reservoir gas cylinder in case of CO2 2. Pump — Reciprocating pump — Syringe pump pulse-free flow at large range of flow rates 3. Restrictor — Maintaining pressure change inside the extraction vessel Two types- — fixed linear restrictor, tapered desire, integral restrictor, ceramic frit restrictor, metal restrictor — Variable variable nozzle, back pressure regulator 5. Collector trapping system 6. Detectors flame ionization detector of gas chromatography Reduction of pressure - SCF unable to dissolve the solute, separation of sold under gravity and the gas at low pressure is compressed back to the supercritical conditions.

Reduction of temperature - solute drops and recovery of solvent without recompression 3. Pumping SCF to expansion tank - where it becomes gas resulting in very less solubility i. Spent gases are then recompressed and recycled.

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Heat exchangers are used to maintain temperature and prevent excessive cooling at throttling valve called as Joule-Kelvin effect. Yonei, Y, et al J.

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P and Rizvi, S. Food Engineering. Vol III. Chapter Extraction. Third Edition. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Log In Sign Up. Bamgbose Timothy. The temperature and pressure are higher than critical temperature Tc and Critical Pressure Pc. Diffusivities are much faster in supercritical fluids than in liquids, and therefore extraction can occur faster. Though co- solvents can be added for the extraction of polar compounds, they will complicate further downstream processing. Disadvantages of Supercritical Fluid Extraction Thus, the number of commercial processes utilizing supercritical fluid extraction is relatively small, due mainly to the existence of more economical processes.

However, its use is likely to increase in some sectors, for example the recovery of high value biological, when conventional extractions are inappropriate, and in the treatment of toxic wastes. A, Hamel, J. Wiley, Chichester. Oxford: Oxford Science Publications. Abraham and A. King, Jerry W. Lipid Biotechnology. Supercritical production and fractionation of fatty acid esters and acylglycerols G. Soto, P. Hegel, S. Pereda Volume 93, September , Pages This article is of high relevance to biodiesel production and reports on the transesterification of sunflower oil with supercritical methanol.

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Supercritical fluid extraction of vegetable matrices: Applications, trends and future perspectives of a convincing green technology M. Silvestre, C. Silva Volume 92, August , Pages Prediction of binary diffusion coefficients in supercritical CO2 with improved behavior near the critical point Raquel V. Vaz, Ana L. Silva Volume 91, July , Pages In this article the authors present a new predictive model for an important transport property, the tracer diffusivities in supercritical carbon dioxide.

The model is validated with a large data base. Ability to predict tracer diffusion coefficients is important in modeling, design or scale-up of rate controlled processes, and as such has significance in applications that range from extraction and impregnations to reactions such as hydrogenation, to other applications such as coatings or particle formation. Champeau, J. Thomassin, C. Tassaign Volume 90, June , Pages In this article, the authors describe coupling of an FTIR microscope with a high pressure cell for in-situ analysis and assessment of CO 2 sorption and the associated swelling of polymer fibers.

They discuss the results in terms of the polymer — CO 2 interactions, polymer chain mobility and the degree of crystallinity. Critical end line topologies for ternary systems Volume 89, May , Pages G. Pisoni, M. Cismondi, L. Cardozo-Filho, M. Zabaloy The article is a comprehensive work on characterizing ternary critical line behavior which is the line between the ternary critical end-points, providing information on the boundaries for ternary phase equilibrium.

The authors provide modern calculation methods and put the results into the context of ternary supercritical systems studied previously and those yet to be discovered. Study of transpiring fluid dynamics in supercritical water oxidation using transparent reactor Z. Chen, G. Wang, Z. Mirza, S. Yang, Y. Xu Volume 88, April , Pages This article provides new insights to the transpiring wall reactors TWR for supercritical water oxidation which have been developed to overcome salt precipitation and corrosion problems.

The article describes a glass transparent reactor that has been designed to permit visual observations of the dynamics of the transpiring fluid using ethanol or acetone as substitute fluids for subcritical water.

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    The results obtained are then used to model the melting point depression and volumetric expansion for comparison with the experimental observations. Regenerable solid CO 2 sorbents prepared by supercritical grafting of aminoalkoxysilane into low-cost mesoporous silica P. Fraile, L.

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    Vega, C. Domingo, Volume 85, January , Pages 68—80 This article addresses an important area of carbon dioxide capture by preparation of solid sorbents via functionalizing and grafting of silica supports with aminosilanes in supercritical carbon dioxide. Search in:. Submit Your Paper.

    The Journal of Supercritical Fluids

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      Dynamic phase behavior during sol-gel reaction in supercritical carbon dioxide for morphological design of nanostructured titania Volume , October , Pages Motohira Kinoshita, Yusuke Shimoyama Nanostructured titania is of interest in various applications ranging from semiconductors to catalys support.

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      Reduction in interfacial tension of water—oil interface by supercritical CO2 in enhanced oil recovery processes studied with molecular dynamics simulation Volume , May , Pages — Bing Liu, Junqin Shi, Muhan Wang, Jun Zhang, Baojiang Sun, Yue Shen, Xiaoli Sun This manuscript describes the results of molecular dynamic simulations on the effect of supercritical carbon dioxide on the water-decane interface. Effect of solvent species inside wet gel on fabrication of titania nanoparticle by supercritical carbon dioxide drying Volume , April , Pages 90—96 Motohiro Kinoshita, Taiki Sugamura, Yusuke Shimoyama This manuscript describes drying of wet gels of TiO2 with supercritical carbon dioxide.