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Continuous-phase cocurrent extraction column and extraction method

A technology of extraction towers and trays, applied in the direction of liquid solution solvent extraction, etc., can solve problems such as difficult extraction effects, achieve the effects of reducing uneven distribution of flow velocity, improving overall mass transfer driving force, and simple structure

Active Publication Date: 2015-07-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, simple packed towers are generally more suitable for extraction systems with low interfacial tension. For systems with high interfacial tension, traditional extraction equipment with stirring or plate towers are more inclined.
[0005] In addition, there are many extraction systems in the industry. The concentration of solute in the two phases varies greatly, and the interfacial tension of liquid and liquid in the entire extraction tower also varies greatly. It is often difficult to obtain the best extraction effect by relying on a single filler. , the plate tower with special structure may have more advantages

Method used

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  • Continuous-phase cocurrent extraction column and extraction method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] as attached Figure 5 As shown, 30 sieve trays are installed in the extraction tower with an inner diameter of φ500mm, and the plate spacing is 200mm. Two kinds of apertures are adopted, the aperture diameter of the upper 15 trays is 3.5mm, and the aperture diameter of the lower 15 trays is 4.5mm.

[0037] The liquid inlet and liquid outlet of the Z-shaped closed channel adopt a symmetrical two-group multi-row strip hole structure. The whole tower plate is assembled, and there are 6 tower sections in total, each section is 1000mm long, and 5 trays are installed inside a single section. distance.

[0038] The aqueous solution containing N,N-dimethylacetamide 20% (wt% hereinafter the same) of flow 1000L / h is added into the riser bottom in the tower from feed port 12 at the bottom of the tower as a continuous phase, and the two of flow 1500L / h Chloromethane is fed into the tower from the feed port 13 at the top of the tower as a dispersed phase, and is evenly distribute...

Embodiment 2

[0042] Using the same extraction device as in Example 1, the flow ratio of the two phases was changed. The aqueous solution containing N,N-dimethylacetamide 20% (wt% hereinafter the same) of flow rate 750L / h is added into the riser in the tower from the inlet 10 at the bottom of the tower as a continuous phase, and the dichloride solution of flow rate 1500L / h Methane is fed into the column from the feed port 11 at the top of the column as a dispersed phase, and is evenly distributed to the top of the column plate by the liquid distributor. In order to maintain stable operation, the liquid-liquid interface at the bottom of the tower should be well controlled.

[0043] During operation, the materials flowing out from the top and bottom of the tower are taken every 20 minutes for analysis, and the operation is stopped after the composition of the discharged materials is basically stable. The average compositions of the water phase at the top of the tower and the oil phase at the...

Embodiment 3

[0046] Using the same extraction device as in Example 1, the composition of the raw materials was changed. The aqueous solution containing N,N-dimethylacetamide 8% (wt% below the same) of flow rate 1000L / h is added into the riser in the tower from feed inlet 10 at the bottom of the tower as the continuous phase, and the dichloromethane of flow rate 1500L / h Methane is fed into the column from the feed port 11 at the top of the column as a dispersed phase, and is evenly distributed to the top of the column plate by the liquid distributor. In order to maintain stable operation, the liquid-liquid interface at the bottom of the tower should be well controlled.

[0047] During operation, the materials flowing out from the top and bottom of the tower are taken every 20 minutes for analysis, and the operation is stopped after the composition of the discharged materials is basically stable. The average compositions of the water phase at the top of the tower and the oil phase at the bo...

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Abstract

The invention discloses a continuous-phase cocurrent extraction column and an extraction method. The extraction column comprises a circular tower column, a plurality of tower plates and a riser tube, wherein a mass transfer unit is defined between two adjacent tower plates; a plurality of Z-shaped baffles are arranged in the riser tube, and divide the riser tube into a series of Z-shaped closed passages; a liquid inlet communicated with the mass transfer unit below each tower plate is formed in the lower part of the semi-circular side wall of each Z-shaped closed passage, while a liquid outlet communicated with the mass transfer unit below an upper tower plate is formed in the upper part of the semi-circular side wall of each Z-shaped closed passage. Therefore, a continuous phase material can flow in two adjacent units in parallel, and contact dispersed phase liquid drops in a crossed manner, that is, the average mass transfer driving force of a single unit can be improved, the whole plate efficiency can reach 25 to 30 percent being higher than that of the traditional continuous phase baffle-type sieve plate extraction column.

Description

technical field [0001] The invention relates to a continuous-phase co-current extraction tower and an extraction method, in particular to provide an extraction tower and a continuous extraction method for the multi-stage countercurrent extraction process in chemical production. Background technique [0002] Multistage countercurrent extraction is a commonly used separation method in chemical production. It relies on the full contact of two-phase materials in the equipment to achieve the purpose of separation. The main equipment currently used are packed towers and plate towers. Packed towers use the cutting action of fillers to cut the dispersed phase into fine droplets to achieve a higher liquid-liquid mass transfer surface. Plate towers mainly use the sieve holes of the trays to The dispersed phase material forms fine droplets. Due to the plate barrier effect of the plate tower, compared with the packed tower, it can greatly reduce the axial back-mixing and improve the ma...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 王成习
Owner ZHEJIANG UNIV
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