Liquid-liquid extraction separation device and use method thereof

Abstract

The invention provides a liquid-liquid extraction separation device and a use method thereof. The liquid-liquid extraction separation device comprises an inner shell, the upper part of the inner shell is externally connected with a liquid inlet pipe, the liquid inlet pipe rotates around a connecting point of the liquid inlet pipe and the inner shell, and at least one static mixing piece is arranged in the liquid inlet pipe. The use method comprises the following steps: introducing an extracting agent and a to-be-extracted liquid into the liquid inlet pipe, fully conducting mixing to cause interphase mass transfer when the mixture passes through the static mixing piece, then injecting the mixture into the inner shell along a preset direction, and forming a rotational flow in the inner shell to complete extraction so as to obtain an extraction liquid and a raffinate. The device is simple in structure and small in occupied area, has extraction and separation functions, and can realize phase transfer and phase separation in the same equipment.

Description

technical field [0001] The invention belongs to the technical field of extraction and separation, and relates to a liquid-liquid extraction and separation device and a use method thereof, in particular to a multi-stage mass transfer enhanced liquid-liquid extraction and separation device and a use method thereof. Background technique [0002] A large amount of sewage is produced incidentally in many industrial production processes, and the types and components of sewage are often complex and diverse. Whether it is to meet environmental protection requirements or to recycle resources, it is often necessary to separate and extract toxic and harmful substances or useful resources contained in sewage. [0003] Solids in sewage are often easier to separate by simple physical methods. For the separation of dissolved substances or emulsions in sewage, it is usually necessary to transfer the dissolved substances or emulsions to the extractant by phase transfer through extraction, a...

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Problems solved by technology

[0004] Existing extraction methods usually include mixed clarifiers, extraction towers, centrifugal extractors, etc. However, these devices have certain disadvantages: such as mixed clarifiers occupy a large area and have low efficiency; extraction towers have poor applicability; centrifugal extractors have complex structures Wait

[0006] However, due to the short residence time of the feed liquid and the early overflow of the light phase from the overflow pipe, although the extraction capacity of the device has been improved to a certain extent, it still cannot obtain a good extraction and separation effect.

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