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Comparison of liquid-liquid extraction in batch systems and micro-channels
Avinash Sahu, Sundari Ramji,
Published in Elsevier B.V.
2016
Volume: 104
   
Pages: 190 - 200
Abstract
Liquid-liquid extraction is an important mass transfer operation in the chemical, food processing and pharmaceutical industries. Our work focuses on experimentally quantifying mass transfer performance in a well stirred batch vessel and in stratified flow and slug flow in micro-channels. Extraction of propionic acid from toluene to water is chosen as a test system. The distribution of propionic acid in toluene and water at equilibrium was found to be non-linear. The batch experiments were carried out both with a flat interface and as a well-mixed dispersed system. The continuous experiments were carried out in micro-channels with a square cross-section. A lumped parameter model was used to quantify the mass transfer coefficient in batch mode. A lumped (distributed) model was used to describe the extraction in a slug (stratified) flow in a micro-channel. The overall extraction performance is characterized as a function of residence time of the phases and the hydrodynamics. It was found that the micro-channel gives a superior extraction performance in the slug flow regime as compared to the well mixed batch system although both have comparable sizes of the dispersed phase. This is attributed to the strong internal circulations induced by shear in the slug flow regime. © 2016 Elsevier B.V..
About the journal
JournalData powered by TypesetChemical Engineering and Processing: Process Intensification
PublisherData powered by TypesetElsevier B.V.
ISSN02552701
Open AccessNo
Concepts (21)
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    Aerodynamics
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    Food processing
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    Hydrodynamics
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    Liquids
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    MASS TRANSFER
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    Propionic acid
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    Residence time distribution
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    Saturated fatty acids
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    Shear flow
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    Solvent extraction
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    Thermal stratification
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    Toluene
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    INTERNAL CIRCULATIONS
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    Liquid-liquid extraction
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    Lumped parameter modeling
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    MASS TRANSFER PERFORMANCE
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    Non linear
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    Pharmaceutical industry
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    Slug flow
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    Stratified flows
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    Extraction