1987
DOI: 10.1021/ie00070a026
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Mass-transfer efficiencies of column contactors in supercritical extraction service

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Cited by 41 publications
(17 citation statements)
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“…However, the HETS values for given systems and packings were almost constant over a given range of nominal velocity of AMF. This was likely due to compensating effects of the increase of interfacial area, turbulence favorable to mass transfer, and increases in backmixing that tend to lower efficiency (Rathkamp et al, 1987;Lahiere and Fair, 1987;Seibert and Moosberg, 1988). Rathkamp et al (1987) also reported a fairly constant HETS value of 6.7 cm for the isopropanol-water-CO, system in a packed column with 6.4 mm raschig rings at a nominal velocity of AMF of 2.5 to 8.9 cmfmin with constant nominal velocity of CO, of 2.2 cm/min at 4O"C/102 bar.…”
Section: Results and Discussion Performance Of Extraction Columnmentioning
confidence: 99%
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“…However, the HETS values for given systems and packings were almost constant over a given range of nominal velocity of AMF. This was likely due to compensating effects of the increase of interfacial area, turbulence favorable to mass transfer, and increases in backmixing that tend to lower efficiency (Rathkamp et al, 1987;Lahiere and Fair, 1987;Seibert and Moosberg, 1988). Rathkamp et al (1987) also reported a fairly constant HETS value of 6.7 cm for the isopropanol-water-CO, system in a packed column with 6.4 mm raschig rings at a nominal velocity of AMF of 2.5 to 8.9 cmfmin with constant nominal velocity of CO, of 2.2 cm/min at 4O"C/102 bar.…”
Section: Results and Discussion Performance Of Extraction Columnmentioning
confidence: 99%
“…Results indicated that the packing increased mass transfer efficiency more than 5-fold compared to the spray column. Lahiere and Fair (1987) also reported that mass transfer efficiency of the packed column, in which a liquid was a continuous phase, was five times greater than that of a spray column. The packing surface increased the tortuosity, thus increasing the residence time of AMF as well as providing a high interfacial area for mass transfer.…”
Section: Discussionmentioning
confidence: 99%
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“…Data A n d y s i a Equilibrium data for conditions (i) and (ii) were obtained from Lahiere (15) and Kander (17). These data were verified in this work and additional phase equilibria f o r 150 atm and 46'C were also obtained.…”
Section: __________________------------------------mentioning
confidence: 99%
“…Up to now almost all countercurrent supercritical fluid extraction studies have been carried out in spray, sieve tray, or packed columns (Peter and Brunner, 1978;Rathkamp et al, 1987;Lahiere and Fair, 1987;Seibert et al, 1988;Czech and Peter, 1990;de Haan and de Graauw, 1991;Brunner et al, 1991;Bernad et al, 1993;Meyer and Brunner, 1994;Lim et al, 1995;Simo ˜es et al, 1995;Sato et al, 1997;Nagase et al, 1997). In these studies countercurrent supercritical extraction columns, particularly packed columns, have been shown to be very efficient compared to conventional liquid-liquid extraction columns.…”
Section: Introductionmentioning
confidence: 99%