ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
A radioisotope technique has been utilized to study the point holdup of the dispersed phase and some operational flow characteristics in a packed countercurrent liquid-liquid extraction tower. The system used was toluene-water and the packing was Raschig rings. The toluene dispersed phase was tagged with gamma-radiating iodine-131.The study revealed that holdup experiences a hysteresis cycle with variations of the continuous-phase flow rate. Correlating equations are presented for “total” and permanent holdup, below loading, to account for this hysteresis. Entrance effects and flow maldistribution effects are readily determined by the method utilized. Displacement studies demonstrated that no simple “operational” dispersed-phase flow holdup exists, but rather a complex dispersed-phase movement, which involves all the “nonhysteresis” permanent holdup.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690030217
Permalink