Books
in black and white
Main menu
Home About us Share a book
Books
Biology Business Chemistry Computers Culture Economics Fiction Games Guide History Management Mathematical Medicine Mental Fitnes Physics Psychology Scince Sport Technics
Ads

Supercritical fluid cleaning - McHardy J.

McHardy J., Sawan P.S. Supercritical fluid cleaning - Noyes publications, 1998. - 304 p.
Download (direct link): spercrificalfluidcleaning1998.pdf
Previous << 1 .. 5 6 7 8 9 10 < 11 > 12 13 14 15 16 17 .. 101 >> Next

Fluoroform, (CHF3) 70.01 1.246 239 1.6 299.3/26.3 48.6 49.2 704.9 132.7 0.259
Sulfur Hexafluoride, (SF6) 146.05 1.83 223 0.0 318.7/45.7 37.6 38.1 545.3 8198.8 0.282
Monofluoromethane, (CH3F) 34.03 0.843 213 1.8 315.0/42.0 56.0 56.7 812.2 113.2 0.240
Dichloromethane, (CH2C12) 84.93 --- --- 1.57 510.0/237.0 63.0 63.8 913.7 --- ---
Chloroform, (CHCI3) 119.38 1.489 293 1.1 536.4/263.4 53.7 54.4 778.9 238.9 0.293
Chlorotrifluoromethane, (CC1F3) 104.46 1.298 243 0.5 302.0/29.0 38.7 39.2 561.3 180.4 0.278
Chlorodifluoromethane, (CHC1F2) 86.47 1.23 289 1.4 369.3/96.3 49.7 50.3 720.8 165.6 0.268
Difluoromethane, (CH2F2) 52.02 --- --- 2.0 351.6/78.6 58.3 59.0 845.6 120.8 0.241
Benzene, (—ń^) 78.11 0.885 289 0.0 562.2/289.2 48.9 49.5 709.2 260.0 0.271
Cyclohexane, (CeHI0) 82.15 0.816 289 0.6 560.5/287.5 43.4 43.9 629.5 --- ---
Isobutane, (C4H10) 58.12 0.557 293 0.1 408.2/135.2 36.5 36.0 529.0 263.0 0.283
Hydrogen Sulfide, (H2S) 34.08 0.993 214 0.9 373.2/100.2 89.4 88.2 1297.0 98.6 0.284
Neo-pentane, (2,2-dimethyl propane) 72.15 0.591 293 0.0 433.8/160.8 32.0 31.6 464.0 303.0 0.269
18 Supercritical Fluid Cleaning
11.0 CONCLUSIONS
After many years of academic interest, supercritical fluids have emerged as revolutionary industrial solvents. In addition to its unique solubility characteristics, a SCF possesses certain other physiochemical properties that add to its attractiveness. For example, even though it possesses a liquid-like density over much of the range of interest, it exhibits gas-like transport properties of diffusivity and viscosity. Additionally, the very low surface tension of SCFs allows facile penetration into microporous materials. For cleaning issues, this property plays a significant role since SCF can penetrate into and in between the yarns and clothes. The properties of gas-like diffusivity and viscosity, zero surface tension, and liquid-like density combined with the pressure dependent solvent power of a supercritical fluid have provided the impetus for applying SCF technology to a gamut of separations problems experienced in many segments of the industry.
The practical as well as fundamental principles governing SCF processing are considered in detail in later chapters with particular reference to the various aspects of cleaning. From the earlier reported literature, one can conclude that a SCF treatment system can be tailored to realize most desired applications by adjusting pressure and/or temperature and other influencing parameters. With the more detailed understanding of various issues, it can be realized that they are ideal environmental friendly candidates to replace ozone depleting chlorofluorocarbons. The following chapters will reinforce this theme based on the principles and practices of exploiting the unique and unusual physical properties of supercritical fluids explained in this chapter.
REFERENCES
1. Mendelejeff, D., Pogg. Annalen Physik Chemie, 141:618 (1870)
2. Hannay, J. B. and Hogarth, J., On the solubility of Solids in Gases, Proc. Roy. Soc. London, 29:324 (1879); 30:178 (1880)
3. King, J. W., Johnson, J. H., and Friedrich, J. P., Extraction of fat tissue from meat products with supercritical carbon dioxide, J. Agric. Food Chem., 37:951 (1989)
4. Wehling, R. L., Froning, G. W., Cuppet, S. L., and Niemann, L., Extraction of cholesterol and other lipids from dehydrated beef using supercritical carbon dioxide, J. Agric. Food Chem., 40:1204 (1992)
5. Bruno, T. J. and Ely, J. F., Supercritical Fluid Technology; Review in Modern Theory and Applications, CRC Press (1991)
6. Williams, D. F., Extraction with supercritical gases, Chemical Eng. Sci., 36:1769 (1981)
7. McHugh, M. A. and Krukonis, V. J., Supercritical Fluid Extraction: Principles and Practice, 2nd Edition, Butterworth-Heinemann (1994)
8. McHugh, M. A., Krukonis V. J., and Pratt, J. A., Supercritical fractionation of polymers and copolymers, Trends. Polym. Sci., 2:301 (1994)
9. Pirrotta, R. and Pava, “., Supercritical carbon dioxideóperformance with potential, Precision Cleaning, 11:37 (1994)
10. Agopovich, J. W., Fluorocarbons and supercritical carbon dioxide service niche needs, Precision Cleaning, III: 15 (1995)
11. Spall, W. D., Supercritical carbon dioxide precision cleaning for solvent and waste reduction, Int. J. Environmentally Conscious Design and Manufacture, 2:81 (1993)
Previous << 1 .. 5 6 7 8 9 10 < 11 > 12 13 14 15 16 17 .. 101 >> Next