supercritical fluid


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supercritical fluid

[¦sü·pər¦krid·ə·kəl ′flü·əd]
(thermodynamics)
A fluid at a temperature and pressure above its critical point; also, a fluid above its critical temperature regardless of pressure.
References in periodicals archive ?
The supercritical fluid is then transported at constant throughput into the melt (B).
At the same time, affinity of the impregnating substance may be higher towards the supercritical fluid than to the polymer which may lead to the decrease in impregnation yield [6].
where S is the solubility expressed as mass fraction (w/w), T is the temperature in K, the association numbers [k.sub.0] and [k.sub.1] are the average number of solvent molecules in the solvated complex, [a.sub.0] and [a.sub.1] depend on the heat of solvation and vaporization of solute, and b is a function of k and depends also on molecular weight of the solute and the supercritical fluid, and k also depends on the supercritical fluid density (d):
Wu, "Supercritical fluid extraction of aurentiamide acetate from Patrinia villosa Juss and subsequent isolation by silica gel and high-speed counter-current chromatography," Journal of Chromatography A, vol.
It was found that supercritical fluid extracted essential oil possessed more acid number with a value of 1.55 as compared to other two methods i.e.
This indicates that the supercritical fluid extraction at low temperature is suitable for the extraction of vitamin E.
Supercritical Fluid Extraction of Emulsions (SFEE): The application of SCFs in particle technology with emulsions appears to be a natural decision to avoid problems from each method separately.
On one hand, the increase of temperature can improve the saturated vapor pressure of the solute; on the other hand, the high temperature also reduces the density of the supercritical fluid, namely, reduce the solubility of the solute.
Supercritical fluids act as natural solvents in industry-water becomes supercritical in power plant steam turbines and supercritical carbon dioxide is used to remove caffeine from coffee beans, for example.
Reliable, dual sapphire syringe pump technology accurately pressurizes the SFT-100XW s stainless steel vessel which is capable of containing supercritical fluids at pressures up to 10,000 psi (69 MPa).
In the RESS technique, the solid is first solubilized in a supercritical fluid and the resulting solution highly compressed in the vicinity of the mixture's critical point.
Waters Corporation announces it has acquired all of the remaining outstanding capital stock of privately held Pittsburgh-based Thar Instruments Inc., the world's largest supercritical fluid chromatography (SFC) manufacturer, for an undisclosed amount.