Dispersed‐Phase Holdup and Characteristic Velocity in an Agitated‐Pulsed Solvent Extraction Column

Dispersed phase hold-up has been measured in a 76.2 mm diameter pulsed packed column for four different liquid-liquid systems. The effects of pulsation intensity, phase ratio, and packing characteristic on the hold-up have been investigated under a variety of operating conditions. The dispersed phase axial hold-up shows a strong non-uniformity, depending on the operating conditions. The results indicated that the characteristic velocity approach is applicable to this type of extraction column for analysis of hold-up. An empirical correlation is derived for prediction of the hold-up in terms of operating variables, physical properties of the systems, and packing geometry. Good agreement between prediction and experiments was observed for all investigated operating conditions.

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Study on Dispersed-Phase Axial Dispersion in an Agitated–Pulsed Solvent Extraction Column with a Step Tracer Injection Technique

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.1c00506 ◽

2021 ◽

Author(s):

Boren Tan ◽

Yanlin Zhang ◽

Yong Wang ◽

Tao Qi

Keyword(s):

Solvent Extraction ◽

Axial Dispersion ◽

Extraction Column ◽

Injection Technique ◽

Dispersed Phase ◽

Tracer Injection

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

10.21203/rs.3.rs-668189/v1 ◽

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.

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Holdup and characteristic velocity in a pulsed packed extraction column

Research Society and Development ◽

10.33448/rsd-v9i8.2543 ◽

2020 ◽

Vol 9 (8) ◽

pp. e674982543

Author(s):

Jarlon Conceição da Costa ◽

Luiz Mário Nelson de Góis ◽

Silvana Mattedi e Silva

Keyword(s):

Flow Rate ◽

Water System ◽

Continuous Phase ◽

Liquid System ◽

Operating Conditions ◽

Extraction Column ◽

Dispersed Phase ◽

Internal Diameter ◽

Phase Flow ◽

Characteristic Velocity

The present work aims to evaluate the hydrodynamics of a pulsed packed extractor, with an internal diameter of 0.026m and a length of 1.0m, using the liquid butanol-water system. Thus, the basic parameters obtained for the hydrodynamic study of the extraction column in question as dispersed phase, slip velocity, characteristic velocity and flooding point. The methodology used in the work consisted of determining the holdup fraction of the dispersed phase, obtained through tests of simultaneous interruptions in the column feedings. The effects of frequency pulsation, dispersed phase flow rate and continuous phase flow rate investigated in the analysis of these parameters. New empirical correlations derived from the predictions of the parameters studied obtained in terms of operating variables and physical properties of the liquid system involved. The average absolute value of the relative error (AARE) was always below 5.6%. Good agreement between calculated and experimental results observed for all investigated operating conditions.

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