Method and apparatus for adjusting the boundary surface...

B - Operations – Transporting – 01 – D

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B01D 11/04 (2006.01) B01D 17/02 (2006.01) C22B 3/02 (2006.01)

Patent

CA 2253290

The invention relates to a method for adjusting the boundary surface between the two mutually separable solutions in liquid-liquid extraction at the discharge end of the separation part and for preventing the aeration of the solutions when discharging them from the separation part, so that the overflow height of the settled, lighter organic solution is maintained constant. In order to adjust the boundary surface in between the mutually separable solutions, the overflow height of the heavier aqueous solution is adjusted by conducting the settled aqueous solution from down upwards through tubular elements, in which case the height of these overflow pipes can be adjusted. The aeration of the solutions when discharging them from the separation part is prevented by conducting the solutions into transfer pipes through covered, shaft-like weir boxes that are deeper than the discharge end. The invention also relates to an apparatus whereby the boundary surface between the solutions is adjusted and the areation prevented.

Procédé permettant d'ajuster la surface limite entre deux solutions séparables l'une de l'autre dans un dispositif d'extraction liquide-liquide à l'extrémité d'évacuation de la partie de séparation et d'empêcher l'aération desdites solutions lors de leur évacuation depuis la partie de séparation, afin de maintenir constante la hauteur de débordement de la solution organique décantée plus légère. Pour ajuster la surface limite entre les solutions séparables l'une de l'autre, on ajuste la hauteur de débordement de la solution aqueuse plus lourde en acheminant la solution aqueuse décantée du bas vers le haut par des éléments tubulaires, auquel cas la hauteur de ces conduites de débordement peut être réglée. On empêche l'aération des solutions lorsqu'elles sont évacuées de la partie de séparation en acheminant lesdites solutions dans des tuyaux de transfert par des boîtes siphon couvertes de type tige qui sont situées plus bas que l'extrémité d'évacuation. La présente invention concerne également un appareil permettant d'ajuster la surface limite entre les solutions et d'empêcher l'aération.

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