Large-phase-ratio extraction device for organic liquid film on bubble surface

Abstract

The invention relates to a large-phase-ratio extraction device for an organic liquid film on a bubble surface. The large-phase-ratio extraction device comprises a column body, an expansion section and an oil-phase bubble distributor, wherein the expansion section is connected with the top of the column body; the oil-phase bubble distributor is connected with the bottom of the column body and comprises at least one oil-phase distribution head; each oil-phase distribution head comprises an outer tube and an inner tube embedded inside the outer tube; the outer diameter of the inner tube is smaller than the inner diameter of the outer tube; an inner-outer tube annular space is formed between the inner tube and the outer tube; the inner tube extends downward below the lower end opening of the outer tube; the mounting position of the upper end opening of the inner tube is lower than the mounting position of the upper end opening of the outer tube; an oil-phase collector is arranged inside the expansion section connected with the top of the column body; a hole is formed in the top end face of the expansion section; a water-phase inlet pipeline enters from the hole; an oil-phase outlet is formed in the lateral wall of the top of the expansion section. With the adoption of the large-phase-ratio extraction device, a small-volume organic oil phase is dispersed in a large-volume continuous water phase when the oil phase volume is very small, and then target components with ultralow concentration in water-phase material liquid can be extracted and enriched through the organic liquid film on the bubble surface.

Description

technical field [0001] The invention belongs to the technical field of solvent extraction and separation, and in particular relates to an organic liquid film large phase extraction device on the surface of bubbles. Background technique [0002] Solvent extraction is an important chemical separation technology, which has the advantages of high separation efficiency, simple operation, and easy scale-up. It is widely used in petrochemical, pharmaceutical, hydrometallurgy, environmental protection and other fields. Traditional extraction equipment is divided into three categories: mixing-clarifying extraction tank, tower extractor, and centrifugal extractor. These devices can effectively control the mixing and phase separation of immiscible water and oil in the extraction process. However, in actual use, the volume ratio (comparison) or flow ratio (flow ratio) of the immiscible water and oil phases should not be too large. [0003] For the mixing-clarifying extraction tank, if...

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Problems solved by technology

However, this method and device cannot realize that the small-volume organic oil phase enters the tower body by forming a layer of oil film on the surface of the "air-in-oil" bubbles. When the water-oil two-phase is operated in countercurrent, it is easy to cause emulsification and it is difficult to clarify phase separation.

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