Calculation of the drop size in pulsed sieve-plate extraction columns

Pietzsch, Wolfgang; Pilhofer, Theo

doi:10.1016/0009-2509(84)87003-7

Cited by 28 publications

(10 citation statements)

References 6 publications

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“…These approaches are physically justified and yield a relatively good prediction of the relationship between the drop size and the operating parameters. On using the formulation of Pietzsch and Pilhofer [22], plotted in Fig. 13, the average drop diameter is well reproduced, especially for large hole diameters.…”

Section: Prediction Of Fluid Dynamics In Pulsed Sieve-plate Columnsmentioning

confidence: 63%

“…The third category includes formulations developed in recent years for modelling the passage of droplets through the sieve plate and determining the average drop diameter from a balance of forces [22] or energy [23]. These approaches are physically justified and yield a relatively good prediction of the relationship between the drop size and the operating parameters.…”

Section: Prediction Of Fluid Dynamics In Pulsed Sieve-plate Columnsmentioning

confidence: 99%

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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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Section: Prediction Of Fluid Dynamics In Pulsed Sieve-plate Columnsmentioning

confidence: 63%

Section: Prediction Of Fluid Dynamics In Pulsed Sieve-plate Columnsmentioning

confidence: 99%

Fluid dynamics of pulsed sieve plate extraction columns

1990

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“…Drop size affects almost all the parameters that influence hydrodynamics and mass transfer in a pulsed sieve-plate extraction column (Pietzsch and Pilhofer, 1984). Knowledge of drop size and distribution are necessary parameters for measuring mass transfer coefficients (Yaparpalvi et al, 1986) and aids in determining the efficiency of the extraction column (Pietzsch and Pilhofer, 1984). It influences the dispersed phase holdup and residence time (Kumar and Hartland, 1996) and the maximum capacity of the column (Pietzsch andPilhofer, 1984 andHartland, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Knowledge of drop size and distribution are necessary parameters for measuring mass transfer coefficients (Yaparpalvi et al, 1986) and aids in determining the efficiency of the extraction column (Pietzsch and Pilhofer, 1984). It influences the dispersed phase holdup and residence time (Kumar and Hartland, 1996) and the maximum capacity of the column (Pietzsch andPilhofer, 1984 andHartland, 1996). Realizing the overwhelming importance of drop size, many investigators studied the effect of column operating variables on drop size and developed correlations for estimating the mean drop size.…”

Section: Introductionmentioning

confidence: 99%

“…Realizing the overwhelming importance of drop size, many investigators studied the effect of column operating variables on drop size and developed correlations for estimating the mean drop size. Among these investigators, Misek (1964), Kagan et al (1965), Miyauchi and Oya (1965), Assenov and Penchev (1971), Kubica and Zdunkiewicz (1977), Boyadzhiev and Spassov (1982), Schmidt (1983), Vassallo et al (1983), Pietzsch and Pilhofer (1984), Hartland (1986, 1996), Ikeda and Suzuki (1992), and Sreenivasulu et al (1997) have developed their own drop size correlations. The analytical correlation of Kumar and Hartland (1986) is considered to be the most respectable among all the available correlations (Grinbaum, 2006) and selected for a comparison to the experimental data in this work.…”

Section: Introductionmentioning

confidence: 99%

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Drop size in a liquid pulsed sieve-plate extraction column

Usman

Sattar

Hussain

et al. 2009

Braz. J. Chem. Eng.

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-The (Benzoic acid + kerosene + water) system was studied in a 5.0 cm diameter liquid pulsed liquid-liquid extraction column with a total number of 80 sieve plates. The effect of pulsation intensity, dispersed phase superficial velocity, and continuous phase superficial velocity on volume-surface mean diameter was studied. Generally, the mean drop diameter decreased more rapidly with the increase of pulsation intensities and superficial velocities at low pulsation intensities and superficial velocities. However, the effect was not found to be significant at higher pulsation intensities and higher superficial velocities. In the interpretation of the experimental results, the drop size was observed to be a function of the operating regimes (mixer-settler, dispersion, and emulsion) of the pulsed sieve-plate extraction column. The experimental mean drop diameters were compared to the most acceptable analytical drop size correlation developed by Kumar and Hartland (1986). The correlation proved to be in good agreement for the column operating in the dispersion regime.

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Axial dispersion in pulsed‐, perforated‐plate extraction columns

1989

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Continuous-phase backmixing coefficients have been determined by continuous tracer injection for pulsed-plate extraction columns of 72-, 152-and 300-mm-diameter. Both single-phase water and two-phase kerosene-water were studied in all three columns, together with four other solvent-water systems in the smallest column; in all cases, water was the continuous phase. Evidence of maldistribution of the phases was obtained in the largest column. The backmixing coefficient was found to increase with column diameter in single-phase operation, but was diameter-independent in the two-phase case. Alternative correlations of the data were based on dimensional analysis and on a physical model, respectively. The influence of different systems was accounted for in the latter in terms of droplet size and terminal velocity, dispersed phase holdup, and density difference. Qualitative color tracer tests on the dispersed phase gave no evidence of backmixing of this phase, although strong forward dispersion was observed in the emulsion regime.

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Calculation of the drop size in pulsed sieve-plate extraction columns

Cited by 28 publications

References 6 publications

Fluid dynamics of pulsed sieve plate extraction columns

Fluid dynamics of pulsed sieve plate extraction columns

Drop size in a liquid pulsed sieve-plate extraction column

Axial dispersion in pulsed‐, perforated‐plate extraction columns

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