Method and apparatus for separation of oil and water

B - Operations – Transporting – 01 – D

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B01D 17/032 (2006.01) B01D 17/00 (2006.01)

Patent

CA 2248044

There is described a method for the separation of liquids of different densities that are not soluble in one another, such as water and oil, where a liquid mixture is placed in a tank in which heat is optionally supplied to the liquid mixture, and separation occurs as the liquid having the highest density sinks toward the bottom of the tank and forms a layer (a) where it may be tapped off, and the liquid having the lowest density rises and forms a layer (c) at the top of the tank (1), and that between the separated liquids is a mixed layer (b) comprising a mixture of the liquids, where the liquid mixture to be separated is fed into the tank in a manner generating the least possible vertical liquid flow, and where the liquid mixture is fed into the tank through one or more outlets that are disposed in a closed-off section of the tank. Also described is an apparatus for carrying out the method.

La présente invention concerne un procédé de séparation de liquides de différentes densités insolubles l'un dans l'autre tel que l'eau et l'huile. Le procédé consiste à placer le mélange liquide dans un réservoir équipé pour réchauffer en cas de besoin le mélange. La séparation résulte du dépôt du liquide le plus dense sur le fond du réservoir. Il se forme ainsi une strate (a) dans laquelle il est possible de prélever le liquide le plus dense, le liquide le moins dense remontant et formant une strate (c) dans le haut du réservoir. Entre les liquides séparés se trouve une couche mixte (b) constituée d'un mélange de liquides que l'on réinjecte dans le réservoir de façon à provoquer le moins possible de circulation verticale des liquides. Cette réinjection du mélange de liquide dans le réservoir se fait via un ou plusieurs orifices situés dans une zone isolée du réservoir. L'invention concerne également un appareil de mise en oeuvre du procédé.

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