2 edition of Dispersed phase holdup in a rotating disc liquid-liquid extraction column. found in the catalog.
Dispersed phase holdup in a rotating disc liquid-liquid extraction column.
Edward Yen-Chung Kung
by Carnegie Institute of Technology. College of Engineering and Science in Pittsburg
Written in English
Ph.D. Thesis, 1959.
Dispersed phase holdup increases with an increase in flow ratio and, consequently, the column becomes unstable at lower dispersed phase flow rate. Moreover, when the continuous phase is an aqueous solution of low viscosity, the rising velocity of the dispersed drops depends on the drop diameter, while the drop diameter in the column . used to predict the performance of Rotating Disc Liquid-Liquid Extraction Contactors. Experimental data previously obtained in two RDC columns of cm diameter, cm height and cm Cited by: 1.
Rotating disk contactor (RDC) extraction columns were invented by Royal Dutch Shell in the early ’s. The columns have a rotor in the center that is driven by an electric motor to. the maximum value of hold-up was at the bottom of the column. The studies relating to the axial profiles of hold-up in rotating disc contactors (RDC) showed that the hold-up is low near the dispersed phase .
Dispersed phase hold-up and flooding behavior were investigated in a pilot plant scale perforated rotating disc contactor (PRDC) using three different liquid–liquid systems. The influence of various operational parameters including rotor speed, continuous and dispersed . By means of suitable drain pipes, a considerable cross-flow is generated in the column which results in additional hold-up for the dispersed phase. Due to the high interface renewal and the smaller back .
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Observation of the dispersed‐phase holdup during column operation revealed a transitional behavior of the 3/8‐in. rings as compared with that of the 1/4‐ and 1/2‐in. or larger packing. Two, and sometimes three, regimes of flow occur in packed extraction columns.
the increase in holdup with increasing continuous‐phase Cited by: 3. Dispersed phase holdup was measured in a liquid-liquid extraction column for the butyl alcohol-water system. The column performance has been studied using two columns of the same diameter (m) but different lengths (m, three stages and m.
The dispersed-phase holdup and characteristic velocity, which are important hydrodynamic performance parameters for solvent extraction columns, were measured and compared to literature correlations under pulsing and nonpulsing conditions using a 75 mm diameter disk-and-doughnut column.
The results show that the dispersed-phase holdup increased with increasing dispersed-phase flow rate, while there was no noticeable change in holdup with the continuous-phase flow rate. Dispersed-Phase Holdup and Characteristic Velocity in a Pulsed and Nonpulsed Disk-and-Doughnut Solvent Extraction Column.
Industrial & Engineering Chemistry Research55 (3), Cited by: Dispersed phase holdup and flooding rates have been measured in a mm diameter asymmetric rotating disc contactor (ARDC) of pilot plant scale for three different liquid–liquid systems.
The effects of operating variables including mass transfer conditions, rotor speed and continuous and dispersed phase velocities Cited by: 5.
Design of several liquid‐liquid extraction columns — packed, pulsed‐packed, pulsed‐plate, Oldshue‐Rushton columns and the rotating disc contactor — was attempted utilizing available correlations for drop size, holdup of dispersed phase Cited by: 5.
The use of countercurrent operating columns for liquid liquid extraction (LLE) • agitated columns with reciprocating, rotating or pulsating equipments for theoretical, to predict the flooding capacity and dispersed phase File Size: KB.
Extraction Column Types: Agitated and Static Columns for Liquid-Liquid Extraction. As part of our liquid-liquid extraction equipment, Koch Modular has a wide range of extractors to choose from, both static and agitated columns. In addition to Koch Modular’s signature KARR Ⓡ Columns and SCHEIBEL Ⓡ Columns, we also provide rotating disc.
In liquid chromatography, the separation phase is a liquid and can either be done using column or plane chromatography. Column chromatography refers to the chromatographic bed shape and can be done with either a solid or liquid phase. 3 extract, consisting of the solute and the solvent, forms a separate liquid phase from the raffinate, consisting of the solute and the diluent is the liquid in the original solution other than the solute.
The equipment from extraction. The published data on dispersed phase hold-up with and without mass transfer in rotating disc extractors has been considered. Using experimental results for 29 liquid/liquid systems from 15 different data sources, allowing for the effect of column Cited by: Rotary agitated extraction columns such as the rotating disc contactor (RDC) are more efficient toluene (dispersed phase) by water (continuous phase) was chosen, as it has been widely used by A.H.
Elshazly et al: Mass transfer behaviour of a new liquid-liquid rotating screen disc. Flooding rates, dispersed phase hold-up, hold-up profile and drop-size distribution were investigated in rotating disk and Oldshue Rushton 0. 10 m diameter, 18 compartment columns with toluene Author: Swati Mohanty.
A number of experimental investigations using the rotating disc contactor (RDC) have reported the measurement of dispersed-phase hold-up, drop size, and size distribution.
However, Cited by: 59 40 J. Mishra and D. Dutt, Engineering study of hold-up in a perforated plate pulse column for the counter-current flow of two immiscible liquids, Chem.
Age India, 20 () 41 A. Kumar and S. Hartland, Correlations for dispersed phase hold-up in pulsed sieve-plate liquid-liquid extraction columns. On the basis of a large bank of published experimental results for eight different types of extraction columns, namely, rotating disk, asymmetric rotating disk, Kuhni, Wirz-II, pulsed perforated-plate, Karr reciprocating-plate, packed, and spray columns, a unified correlation for the prediction of dispersed-phase.
extraction systems. In regard with the dispersed phase holdup, spray extraction column, as one of the simplest extraction columns, can operate in three modes of packing of the dispersed phase drops: dispersed.
Dispersed phase holdup has been measured in a 76 mm diameter pulsed disc and doughnut extraction column for three different liquid-liquid systems. The effects of operational variables such as pulsation intensity and dispersed and continuous phase flow rates on holdup.
The principles used in analyzing the performance of rotating disk contactor liquid extraction columns are discussed. The behavior of a swarm of drops in the rotating field is found to be adequately represented in most respects by single‐drop dynamics, which leads to tested relations for countercurrent capacity, limiting drop holdup, axial diffusion of the continuous and dispersed.
Mean drop size and dispersed-phase holdup data are generalized for spray extraction columns with loose, close, and turbulized close drop packings.
A graphical method is suggested for Cited by: 5. The dispersed phase velocity, u y, is relative to the walls of the column . Model parameters Equation (1) is general for any type of extraction column.Date is but item is still marked as Submitted.
The deacidification of corn oil by continuous liquid-liquid extraction was investigated in a rotating disc column. The solvent was ethanol containing approximately 6% water. The influence of rotor speed, oil phase flow, and column geometry upon the dispersed phase holdup and the mass transfer efficiency was studied.
The dispersed phase Cited by: