A multi-stage extraction process

B - Operations – Transporting – 01 – D

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B01D 11/04 (2006.01)

Patent

CA 2234943

This process for multi-phase extraction is carried out in an extraction apparatus comprising a multiplicity of stages connected in series, wherein each stage comprises an extraction and a reextraction chamber. In the extraction chamber, a raffinate phase is brought into contact with an extractant, which is reextracted, in contact with an extract phase, in a reextraction chamber. In the course of the process, the extractant is conveyed in cross-flow to the extract and raffinate phases within the same stage in each case, whilst the raffinate and extract phases are conveyed through some or all of the stages in counter- current flow.

Ce procédé d'extraction à phases multiples est réalisé dans un appareil d'extraction comprenant une pluralité d'étages montés en série, chaque étage comportant une chambre d'extraction et une chambre de réextraction. Dans la chambre d'extraction, une phase donneuse est mise en contact avec un agent d'extraction qui est réextrait dans une chambre de réextraction en contact avec une phase acceptrice. L'agent d'extraction est acheminé en flux croisé avec la phase acceptrice et la phase donneuse dans le même étage, tandis que la phase donneuse et la phase acceptrice sont acheminées à contre-courant à travers une pluralité d'étages ou la totalité des étages.

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