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Evaluation of Packed Columns in Supercritical Extraction Processes
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The purpose of the present work is to add to the base of knowledge in the use of packed columns when used in supercritical extraction service. Experimental studies were performed on a one-inch diameter supercritical fluid extraction column operated in both spray and packed column arrangements. The packing used was 1/4 inch Raschig rings with a surface area of 220 ft^2/ft^3 . The supercritical systems studied were carbon dioxide/ethanol/water and carbon dioxide/isopropanol/water at 102 atmospheres and 35°C and 102 atmospheres and 40°C, respectively. In order to compare supercritical with conventional extraction, similar data were obtained in the same column with the toluene/acetone/ water system at one atmosphere and 24°C. The results show that high rates of mass transfer were obtained in the supercritical systems when compared with the conventional system. Height equivalent to a theoretical stage (HETS) values in the range of 10 to 50% of the values for the conventional system were obtained in both the spray and packed column arrangements.
Supercritical Extraction Service
Rathkamp, P. J.; Fair, J. R.; Humphrey, J. L. (1986). Evaluation of Packed Columns in Supercritical Extraction Processes. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from