Axiale Vermischung und Maßstabsvergrößerung bei statischen Kolonnen für die Extraktion von Flüssigkeiten

Becker, Oliver

doi:10.1002/1522-2640(200202)74:1/2<59::aid-cite59>3.0.co;2-z

Cited by 6 publications

(8 citation statements)

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“…. It should be noted that this is only a rough estimate since the accuracy of this correlation decreases for Bodenstein numbers below 50 .

true N_{normaltank} \approx \frac{Bo}{2}

…”

Section: Resultsmentioning

confidence: 90%

“…The required transfer function g T ( t ) for open‐open boundary conditions is given by Eq. , where L denotes the distance between inlet and outlet, i.e., the length of the active extraction part in the column . Open boundary conditions can be assumed for this study since the inlet and outlet signals are measured directly in the active extraction part of the column, meaning the flow profile does not change at the boundaries of the measuring section.…”

Section: Theorymentioning

confidence: 99%

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Axial Backmixing and Residence Time Distribution in a Miniaturized, Stirred‐Pulsed Extraction Column

2017

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Axial backmixing is an important issue in extraction columns since it heavily affects the mass transfer performance. A miniaturized, stirred-pulsed column was investigated regarding its backmixing characteristics in the continuous phase, using the system water/n-butyl acetate. Residence time distributions were determined through pulse experiments with potassium chloride, which was detected via electrical conductivity. To perform the conductivity measurement without distortion of the two-phase flow, electrodes with an annular design that precisely line up with the inner column wall were manufactured. This design is a promising alternative for use in small-scale tubular devices where commercial electrodes do not fit and in applications where interference with the flow must be avoided.

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“…. It should be noted that this is only a rough estimate since the accuracy of this correlation decreases for Bodenstein numbers below 50 .

true N_{normaltank} \approx \frac{Bo}{2}

…”

Section: Resultsmentioning

confidence: 90%

Section: Theorymentioning

confidence: 99%

Axial Backmixing and Residence Time Distribution in a Miniaturized, Stirred‐Pulsed Extraction Column

2017

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“…The flow profile in an extraction column cannot be regarded as an ideal plug flow, which indicates a constant velocity across the cross‐sectional area and, moreover, the absence of any axial backmixing. Instead, axial backmixing occurs due to entrainment of the continuous phase in the wake vortex of drops, entrainment of small droplets with the continuous phase as well as flow channeling and dead zones , , . Axial backmixing diminishes the concentration gradient between the phases along the column height, leading to reduced mass transfer rates.…”

Section: Theorymentioning

confidence: 99%

Hydrodynamics and Mass Transfer in a Lab‐Scale Stirred‐Pulsed Extraction Column

Soboll

Kockmann

2018

Chem Eng & Technol

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An extraction column with energy input through simultaneous stirring and pulsation allows for efficient countercurrent extraction on lab-scale. While stirring generates small droplets with a narrow droplet size distribution, pulsation supports the axial transport of the dispersed phase, enabling countercurrent flow on this small scale. By studying the influence of several operating parameters, fundamental mechanics and characteristics of the column are revealed. Increasing the stirrer speed leads to smaller droplets and higher extraction performance as well as lower maximum throughput. The maximum throughput is increased by raising the pulsation intensity.

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“…Static or pulsed packed countercurrent liquid‐liquid extraction columns are state‐of‐the‐art for different separation processes. The advantages of packed columns are high flexibility and low investment costs . High‐pressure extraction columns are preferably operated in countercurrent mode and filled with static structured packings.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, either the substance used in production or dedicated tracer experiments can be used. A comprehensive overview of all methods for measuring and calculating the axial dispersion in packed extraction columns is given by Becker . These methods are mainly applied in liquid‐liquid extraction.…”

Section: Introductionmentioning

confidence: 99%

Inline Measurement of the Residence Time Distribution in High‐Pressure Extraction Columns

2020

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Axial backmixing lowers the efficiency of packed countercurrent high-pressure extraction columns. To quantify backmixing, a method of measuring the residence time distribution and calculating the axial dispersion coefficient in high-pressure extraction columns is introduced. Using a design of experiments, the effect of supercritical and liquid mass flow rates as well as the pressure at a constant temperature on the mean residence time and the axial dispersion coefficient are evaluated for the system water/supercritical CO 2. The experimental data is correlated to the Reynolds and Schmidt number.

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Axiale Vermischung und Maßstabsvergrößerung bei statischen Kolonnen für die Extraktion von Flüssigkeiten

Cited by 6 publications

References 0 publications

Axial Backmixing and Residence Time Distribution in a Miniaturized, Stirred‐Pulsed Extraction Column

Axial Backmixing and Residence Time Distribution in a Miniaturized, Stirred‐Pulsed Extraction Column

Hydrodynamics and Mass Transfer in a Lab‐Scale Stirred‐Pulsed Extraction Column

Inline Measurement of the Residence Time Distribution in High‐Pressure Extraction Columns

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