Supercritical Fluid Separation Processes

The two SCFs most often studied—CO2 and water—are the two least expensive of all solvents. CO2 is nontoxic and nonflammable and has a near-ambient critical temperature of 31. UC. CO2 is an environmentally friendly substitute for organic solvents including chlorocarbons and chlorofluorocarbons. Supercritical water (Tc = 374°C) is of interest as a substitute for organic solvents to minimize waste in extraction and reaction processes. Additionally, it is used for hydrothermal oxidation of hazardous organic wastes (also called supercritical water oxidation) and hydrothermal synthesis. (See also Sec. 15 for additional discussion of supercritical fluid separation processes.)... 

Supercritical fluid separation processes operate at pressures ranging from 1000 to 4000 lb/in.2, pressures that might be considered high, especially in the foods and essential oils industries. However, because of the factors just listed, supercritical fluid extraction has become eco-... 

Keith P. Johnston, Ph.D., P.E., Professor of Chemical Engineering, University of Texas (Austin) Member, American Institute of Chemical Engineers, American Chemical Society, Univ. of Texas Separations Besearch Program. (Supercritical Fluid Separation Processes)... 

How does one evaluate the process viability of an SCF application We have touched on economics several times in the preceding chapters, but only superficially. As there are no hard and fast answers to questions of viability with traditional processes, so are there none with supercritical fluid extraction. Nevertheless, both of us are asked quite frequently How much will it cost To indicate why there is no single answer, we list below just a few of the parameters that influence the cost of a supercritical fluid separation process ... 

Gupta, R. B., and K. P. Johnston, Supercritical Fluid Separation Processes, in D. W. Green and R. H. Perry (Eds.), Perry s Chemical Engineers Handbook, 8 ed., McGraw-Hill, New York, 2008,... 

KP Johnston. Supercritical fluid separation processes. In RH Perry, DW Green, JO Maloney, eds. Perry s Chemical Engineers Handbook. 7th ed. New York McGraw-Hill, 1997, pp 22.14-22.19. 

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