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Centrifugal Extractor

1940
  • Walter J. Podbielniak
Extracteur centrifuge utilisé en génie chimique pour l'extraction liquide-liquide.

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A centrifugal extractor is a high-speed device that uses force centrifuge, often thousands of times greater than gravity, to achieve rapid and efficient liquid-liquid extraction. It provides very short residence times and high throughput in a compact volume. This makes it ideal for separating liquids with small density differences, systems prone to emulsification, or for processing unstable compounds.

Centrifugal extractors, such as the Podbielniak or Luwesta contactors, represent a significant advancement over gravity-based equipment like mixer-settlers or columns. The core principle involves introducing the heavy and light liquid phases into a rapidly spinning rotor. Inside the rotor, the liquids flow counter-currently through a complex path, often involving concentric perforated cylinders or a spiral channel. The immense centrifugal force creates a highly efficient mixing and dispersion of the phases, leading to rapid mass transfer. Crucially, this same force then drives the rapid separation of the phases, forcing the denser liquid to the periphery of the rotor and the lighter liquid towards the center, from where they are discharged through separate outlets.

Les principaux avantages sont un temps de séjour très court (en secondes plutôt que en minutes ou en heures), essentiel pour extraire des produits chimiquement instables comme les antibiotiques. viscosité, which would be impossible in gravity settlers. It also readily breaks emulsions that would otherwise halt a process. The equipment is compact, providing many theoretical stages in a single machine, which drastically reduces the plant footprint and solvent inventory compared to a mélangeur-décanteur cascade of equivalent capacity. However, they are mechanically complex, have high capital and maintenance costs, and are less suitable for processes involving solids.

UNESCO Nomenclature: 3305
- Génie chimique

Taper

Dispositif physique

Perturbation

Substantiel

Usage

Créneau/spécialité

Précurseurs

  • invention of the cream separator centrifuge by gustaf de laval
  • development of high-speed rotating machinery and bearings
  • compréhension de mécanique des fluides La force g élevée permet la séparation efficace des systèmes présentant de très petites différences de densité ou des
  • industrial need for purifying unstable compounds like penicillin during wwii

Applications

  • penicillin production and other antibiotic purification
  • extraction of active pharmaceutical ingredients (APIs)
  • food industry for vegetable oil refining and citrus oil extraction
  • fine chemical and specialty polymer production
  • hydrometallurgical extraction of precious metals
  • environmental remediation for removing contaminants from water

Brevets:

  • US2044854A
  • US2578348A

Idées d'innovations potentielles

  • 3d-printed rotors for customized, application-specific internal geometries
  • hermetically sealed, magnetically coupled centrifugal extractors for sterile bioprocessing
  • integration of real-time spectroscopic sensors within the extractor for process analytical technology (PAT)
  • development of multi-functional units combining reaction and extraction in a single rotor
  • use of advanced materials like silicon carbide for rotors to handle highly corrosive media
  • miniaturized, lab-on-a-chip centrifugal extractors for high-throughput screening
  • computational fluid dynamics (cfd) simulations to optimize flow paths and minimize energy consumption
  • autonettoyant designs for processing liquids with suspended solids
  • extractors with variable speed control to dynamically optimize separation efficiency
  • use in liquid-phase nanotechnology for nanoparticle synthesis and purification
Related to: centrifugal extractor, podbielniak, luwesta, liquid-liquid extraction, high-g force, short residence time, emulsion breaking, counter-current, chemical engineering, pharmaceutical production.

Contexte historique

Centrifugal Extractor

1940
1940
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1945-01-01
1949
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1940
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1948
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1950

(si la date est inconnue ou non pertinente, par exemple « mécanique des fluides », une estimation arrondie de son émergence notable est fournie)

10e année anniversaire

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