Liquid purification or separation – With means to add treating material – Directly applied to separator
Patent
1994-06-02
1996-06-18
Lithgow, Thomas M.
Liquid purification or separation
With means to add treating material
Directly applied to separator
2102422, 2102423, 210538, 210540, 210923, 210776, E02B 1504, B01D 17032, B01D 17028
Patent
active
055274617
ABSTRACT:
A mechanical device is used for separating oil films from the surface of water or for separating any two immiscible phases where the lighter phase forms a thin film on the top of the heavier phase. Both phases flow into the airlift scavenger outer vessel through a strainer which provides easier access to the lighter or oil phase due to larger orifices being located at the top of the strainer. After flowing into the vessel, both phases flow downwards to an expansion zone where the fluid velocities drop. This allows the large oil slugs to rise to the top of the outer vessel. The water phase, containing medium and small sized oil slugs, flows downwards to a baffle that turns the flow upwards. This causes the medium sized oil slugs to reverse their downward motion and rise to the top of the outer vessel to agglomerate at the top. This oil phase is continuously pumped to a storage vessel for recovery. The water phase containing small oil slugs continues downwards to the bottom of the outer vessel where it enters an inner vessel. Small air bubbles are blown into the bottom of the inner vessel through a sparger. These bubbles rise and cause the water/oil mixture also to flow upwards. This rising motion provides the energy necessary to pull the fluids through the strainer and down through the outer vessel. While rising, the small oil slugs are attracted to the air bubbles and attach to them. These oil slugs coalesce at the top and are transported (along with the water) through a smooth channel into a third separator vessel. The third vessel is the final separating vessel which permits the coalesced oil to rise to the top and so be continuously pumped to a storage vessel for recovery. The bottom water phase is now cleaned of oil and is allowed to flow back into the receiving waters.
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Battison Adrian D.
Lithgow Thomas M.
Thrift Murray E.
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