ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
This paper describes further research on a 4-in. I.D. by 8-ft. spray tower of Elgin design. Previous work concerned limiting flow and holdup in this tower. Owing to its high capacity and low cost, the spray tower would have much greater commercial application in liquid-liquid extraction if its conditions of transient operation could be predicted and if it could be operated to yield low Ht values. This research attempts to show that transient conditions can be predicted and that low Ht values for both mass and heat transfer can be realized near the limiting flow conditions.Theroretical equations for rate of approach to steady state derived and tested for the systems ethylene dichloride-water-propionic acid and ethylene dichloride-water-acetic acid show that the approach depends on the ratio of the phase flow rates. This study is important for the prediction of start-up time for industrial towers.With the same systems the extraction capacity of the spray tower was investigated up to the condition of rejection. The results were correlated as KEa and Ht, OE vs. a function of the ratio of the phase flow rates. The dispersed-phase flow rate was found to have primary significance.The heat transfer rates between water as continuous phase and solvents of various denisties were correlated as Ht′ values plotted against a function of the ratio of the phase flow rates. The advantages of operation near rejection were demonstrated, and the effect of direction of heat transfer was found to be significant.
Additional Material:
19 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690030117
