Secondary counter-current extraction device and method

Abstract

The invention relates to a secondary counter-current extraction device and method, belongs to the technical field of secondary counter-current extraction of a reducing solution and provides a secondary counter-current extraction device and method which are capable of reducing extraction water consumption and reducing steam consumption. The device comprises a reducing solution storage tank, a soft water storage tank, a primary mixer, a secondary mixer, a primary extraction tank, a secondary extraction tank, an inorganic phase storage tank, an organic phase storage tank and the like, wherein the reducing solution and soft water after cooling are subjected to primary mixing with a secondary extraction water phase through the primary mixer, a primary mixed liquid enters the primary extraction tank for split-phase extraction, a primary extraction water phase extracted from the tank top enters the inorganic phase storage tank, a primary extraction oil phase extracted from the tank bottom is subjected to secondary mixing with the cooled soft water through the secondary mixer, a secondary mixed liquid enters the secondary extraction tank for split-phase extraction, a secondary extraction water phase extracted from the tank top enters the primary mixer, and a secondary extraction oil phase extracted from the tank bottom enters the organic phase storage tank. The secondary counter-current extraction device and method are mainly applied to the liquid extraction.

Description

technical field [0001] The invention relates to a two-stage countercurrent extraction device and method, and belongs to the technical field of two-stage countercurrent extraction of reducing liquid. Background technique [0002] The current device for extracting the reducing solution is a reducing solution single-stage extraction tower, which uses soft water as the extraction agent to extract the inorganic phase and the organic phase in the reducing solution. However, the water phase extracted from the single-stage extraction tower cannot be recycled. The process requires a large amount of extraction water, and the volume ratio of reducing solution to soft water is 1:0.9, which wastes water resources and also leads to large steam consumption in the subsequent inorganic phase evaporation process, which increases the cost of the enterprise. Therefore, it is necessary to improve the prior art. Contents of the invention [0003] In order to overcome the deficiencies in the pr...

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Problems solved by technology

[0002] The current device for extracting the reducing solution is a reducing solution single-stage extraction tower, which uses soft water as the extraction agent to extract the inorganic phase and the organic phase in the reducing solution. However, the water phase extracted from the single-stage extraction tower cannot be recycled. The process requires a large amount of extraction water, and the volume ratio of reducing solution to soft water is 1:0.9, which wastes water resources and also leads to large steam consumption in the subsequent inorganic phase evaporation process, which increases the cost of the enterprise

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