Continuous-Phase Axial Dispersion in Liquid-Liquid Spray Towers

1970 ◽  
Vol 9 (3) ◽  
pp. 384-392 ◽  
Author(s):  
J. E. Henton ◽  
S. D. Cavers
Keyword(s):  
Continuous Phase ◽  
Axial Dispersion ◽  
Liquid Spray

Axial dispersion coefficients of the continuous phase in liquid-liquid spray towers

1982 ◽  
Vol 21 (3) ◽  
pp. 306-311 ◽  
Author(s):  
C. J. Geankoplis ◽  
J. B. Sapp ◽  
F. C. Arnold ◽  
G. Marroquin
Keyword(s):  
Continuous Phase ◽  
Axial Dispersion ◽  
Dispersion Coefficients ◽  
Liquid Spray

Effect of vertical alignment on continuous-phase axial mixing in a pilot liquid/liquid spray column

AIChE Journal ◽  
1982 ◽  
Vol 28 (5) ◽  
pp. 858-861 ◽  
Author(s):  
Milos Horvath ◽  
Constantine Pikios ◽  
S. D. Cavers
Keyword(s):  
Continuous Phase ◽  
Vertical Alignment ◽  
Spray Column ◽  
Liquid Spray

scholarly journals Hydrodynamics of pulsed sieve-plate extraction columns

2020 ◽  
Vol 74 (1) ◽  
pp. 1-14
Author(s):  
Milan Sovilj ◽  
Momcilo Spasojevic
Keyword(s):  
Continuous Phase ◽  
Liquid System ◽  
Axial Dispersion ◽  
Superficial Velocity ◽  
Dispersed Phase ◽  
Geometrical Parameters ◽  
Drop Diameter ◽  
Sieve Plate ◽  
Axial Dispersion Coefficient ◽  
Hydrodynamic Parameters

This paper presents a review of some hydrodynamic parameters in pulsed sieve-plate extraction columns. The hydrodynamic parameters in liquid-liquid systems in these columns were analyzed regarding the effects of operating and geometrical parameters. The values of Sauter mean drop diameter were function of the existing work flow regimes in the column device defined as mixer-settler, emulsion and dispersion regimes. It was concluded that the dispersed-phase holdup was a function of the mean drop diameter and dispersed-phase superficial velocity. An increase in the dispersed-phase holdup induced an increase in the interface area in the liquid-liquid system. Knowledge of the value of the dispersed-phase holdup can be used for calculation of the volumetric mass transfer coefficient, one of the important factor in the design of the column extractor. It was concluded that the increase in the dispersed-phase superficial velocity is causing a decrease in axial dispersion. On the other hand, an increase in the continuous-phase superficial velocity is causing the increase in the axial dispersion coefficient. Some of the empirical equations proposed in literature for calculations of the hydrodynamic parameters were presented. These correlations, derived for determination of the hydrodynamic parameters in pulsed sieve-plate extraction columns, can be used for the design of these liquid-liquid extraction columns.

Axial Dispersion in a Three-Phase Gas-Agitated Spray Extraction Column

1998 ◽  
Vol 63 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Milan Sovilj
Keyword(s):  
Gas Phase ◽  
Dispersion Coefficient ◽  
Continuous Phase ◽  
Axial Dispersion ◽  
Superficial Velocity ◽  
Extraction Column ◽  
Dispersed Phase ◽  
Dispersion Coefficients ◽  
Axial Dispersion Coefficient ◽  
Three Phase

The continuous-phase axial dispersion coefficients of the three-phase gas-liquid-liquid system in a gas-agitated spray extraction column 10 cm i.d. at 20 °C were examined. The system used was water as continuous phase, toluene as dispersed phase, and air as gaseous phase. The rise in the gas phase superficial velocity increased the continuous-phase axial dispersion coefficient. A non-linear dependence between the continuous-phase axial dispersion coefficient and the continuous phase superficial velocity was observed. No correlation was found between the continuous-phase axial dispersion coefficient and dispersed phase superficial velocity. The increase in the gas phase hold-up corresponded to a slight increase in the continuous-phase axial dispersion coefficient. The increase in the dispersed phase hold-up generated a growth of the continuous-phase axial dispersion coefficient. A comparison was made of the continuous-phase axial dispersion coefficients of the three-phase (air-water-toluene) and two-phase (water-toluene) systems.

scholarly journals Reactive Zinc Extraction in MRDC Column; Case Study by Mathematical Modelling and Applying the Droplet Size Distribution with Forward Mixing Approach

2021 ◽  
Author(s):  
Benyamin Shakib ◽  
Rezvan Torkaman ◽  
Meisam Torab-Mostaedi ◽  
Mojtaba Saremi ◽  
Mehdi Asadollahzadeh
Keyword(s):  
Mathematical Modeling ◽  
Mass Transfer ◽  
Solvent Extraction ◽  
Mass Transfer Rate ◽  
Continuous Phase ◽  
Axial Dispersion ◽  
Extraction Column ◽  
Dispersed Phase ◽  
Rotor Speed ◽  
Zinc Extraction

Abstract In this survey, the reactive mass transfer data are determined for zinc extraction from chloride solution using D2EHPA in the MRDC extraction column. The numerical analysis for evaluating the column performance is applied to describe mass balance equations. Four mathematical models (backflow, forward mixing, plug flow, and axial dispersion) are investigated to compute the mass transfer coefficients of the dispersed phase. The solvent extraction experiments showed that the optimum zinc transport efficiency in rotor speed of 410 rpm in this column is equal to 98.85% and 99.85 for extraction and stripping stages, respectively. The model's achievement is compared with the solvent extraction data and a significant validity is obtained by coupling the forward mixing approach. The mathematical modeling expresses that the coefficients of axial dispersion and backflow based on the continuous phase increase by an increase in the rotor speed and inlet continuous phase rate. While these coefficients reduce at a higher inlet dispersed phase rate. The FMM method is preferred to predict the reactive mass transfer rate in the MRDC column due to the lowest relative deviation. The experimental study and mathematical modeling in this report provide beneficial information about the metallurgical industry to design solvent extraction equipment.

Axial dispersion and heat transfer in liquid-liquid spray towers

AIChE Journal ◽  
1967 ◽  
Vol 13 (1) ◽  
pp. 21-28 ◽  
Author(s):  
F. O. Mixon ◽  
D. R. Whitaker ◽  
J. C. Orcutt
Keyword(s):  
Heat Transfer ◽  
Axial Dispersion ◽  
Liquid Spray

Liquid-Liquid Spray Towers: Continuous Phase Peclet Numbers

1973 ◽  
Vol 12 (3) ◽  
pp. 365-372
Author(s):  
Jeffrey E. Henton ◽  
Larry W. Fish ◽  
Stuart D. Cavers
Keyword(s):  
Continuous Phase ◽  
Liquid Spray
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