Flooding in pulsed sieve plate extractors

Berger, Rosemarie; Walter, K.

doi:10.1016/0009-2509(85)85119-8

Cited by 28 publications

(15 citation statements)

References 4 publications

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“…15). The analytical technique of McAllister with the correction of Berger [3] has been examined. The calculations indicate that this approach is applicable only for predicting maximum throughput for small hole diameters or fractional free areas.…”

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confidence: 99%

Fluid dynamics of pulsed sieve plate extraction columns

1990

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The present contribution reports on comprehensive hydrodynamic investigations in two pulsed sieve-plate extraction columns (PSE) on a pilot scale. The experiments were conducted with three different sieve plate geometries employing test systems recommended by EFCE, under varying pulsation conditions and throughputs. The results of the investigation add to the existing knowledge of relationships between hydrodynamic parameters, drop size, hold-up, flooding throughput and mixing and operating parameters. They also provide useful information for scaleup, selection of sieve-plate geometry, most favourable operating range, and constructive design of equipment. On the basis of measurements, analytical methods are recommended for prediction of PSE hydrodynamics.

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confidence: 99%

Fluid dynamics of pulsed sieve plate extraction columns

1990

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“…A correlation for predicting the characteristic velocity (V o ) was developed using experimental data obtained on five liquidliquid systems. Kagan et al [2], Berger and Walker [19] and Lorenz et al [4] have studied the effect of operating parameters, that is, pulse velocity and phase ratio on throughput in PSPEC. It was observed that, in mixer-settler regime, as pulse velocity increases capacity of the column increases and flooding occurs at higher flow rates.…”

Section: Previous Workmentioning

confidence: 99%

“…As there was no significant effect of A and f separately, the product Af has been suggested to study the flooding behaviour. Kagan et al [2], and Berger and Walker [19] studied the effect of phase flow ratio (V d /V c ) on throughput. It was found that increase in dispersed phase flow rate increases the resistance to the flow of continuous phase through the column cross-section which causes flooding of column at greater phase ratio of V d /V c .…”

Section: Previous Workmentioning

confidence: 99%

Hydrodynamics of a Pulsed Sieve Plate Extraction Column

Somkuwar

Kolhe

Rathod

2014

Indian Chemical Engineer

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Hydrodynamic characteristics, such as drop size, dispersed phase hold-up and flooding have been studied experimentally in a pulsed sieve plate extraction column of 0.076 m diameter. Geometrical parameters like perforation diameter, plate spacing and fractional free area (FFA) of sieve plate and operating parameters, such as pulse velocity and superficial velocities of dispersed and continuous phase, were studied using kerosenewater system. The drop size was reduced with decrease in perforation diameter, plate spacing, FFA and pulse velocity. Dispersed phase hold-up was found to be a function of drop size and superficial velocity of dispersed phase. At pulse velocity of 0.025m/s the parabolic behaviour with maxima at the transition from mixer-settler to dispersion regime of flooding curve has been noticed for all the different geometrical conditions. The maximum mass transfer interface together with utmost throughput was obtained at perforation diameter of 0.003 m, plate spacing of 0.05m and FFA of 0.2. The optimal operating parameters were pulse velocity of 0.025 m/s and superficial velocity of 0.006 m/s using organic to aqueous ratio (O/A) of 1:1. The drop size attained at these conditions was 0.0015 m with dispersed phase hold-up of 18%. The correlations developed can be used for the prediction of hold-up and drop size.

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“…The measurement of the differential pressure proved to be the most rapid and the most exact method for measuring the flood point (Berger and Walter, 1985). In addition, it has the advantage that it can also be used for plant columns, where an observation of drop phase is impossible.…”

Section: Methodsmentioning

confidence: 99%

“…When this limit (flooding point) is exceeded, dispersed phase drops can no longer fall or rise against the flow of the continuous phase and stable column operation is unattainable. The maximum volumetric capacity of an extractor, or flooding throughput, is thus the first question that must be dealt with in design of an extraction column (Berger and Walter, 1985). Column diameter is then usually calculated from the knowledge of the column flooding behavior by assuming operating loads as a fraction of flooding throughput or else by considering the operating holdup value as a fraction of the dispersed phase volume fraction at flooding.…”

Section: Introductionmentioning

confidence: 99%

Flooding characteristics in pulsed packed extraction columns

Asadollahzadeh

Asl

Safdari

et al. 2011

Braz. J. Chem. Eng.

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-Flooding behavior of a 76.2 mm diameter pulsed packed column has been determined using four different liquid-liquid systems. The effects of pulsation intensity, flow ratio, interfacial tension, and packing geometry on flood point have been investigated. The results showed that the maximum throughput of the column decreases with an increase in pulsation intensity and flow ratio, while it increases with an increase in interfacial tension. The applicability of the characteristic velocity method to this type of column for the analysis of the flood point was examined and a marked deviation was observed between experimental results and values calculated by this method. Two new empirical correlations for flooding velocity and holdup at flooding are derived in terms of operating variables, packing characteristics, and physical properties of the liquid systems. Good agreement between prediction and experiments has been found for all operating conditions that were investigated.

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Flooding in pulsed sieve plate extractors

Cited by 28 publications

References 4 publications

Fluid dynamics of pulsed sieve plate extraction columns

Fluid dynamics of pulsed sieve plate extraction columns

Hydrodynamics of a Pulsed Sieve Plate Extraction Column

Flooding characteristics in pulsed packed extraction columns

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