CN115671789A - Interstage non-back-mixing turntable dispersive extraction device and application thereof - Google Patents

Abstract

The invention discloses an interstage non-back-mixing turntable dispersing extraction device and application thereof in liquid-liquid extraction. The device comprises a tower body, wherein a rotating shaft and a plurality of guide pipes which are longitudinally arranged are arranged in the tower body, the outer side walls of the guide pipes are fixedly connected with the inner side wall of the tower body through annular interstage clapboards, and the interstage clapboards divide the interior of the tower body into a plurality of extraction stages which are longitudinally distributed; a mixed extraction area is arranged between the adjacent guide pipes, the rotating shaft penetrates through the guide pipes, and a dispersion disc is arranged on the rotating shaft at the position of the mixed extraction area; in an extraction stage, the annular space between the mixed extraction area, the guide pipe and the inner side wall of the tower body is a light-heavy phase separation area; the side surface of the flow guide pipe is positioned above and below the interstage partition plate connected with the flow guide pipe, and a heavy phase inlet and a light phase inlet are respectively arranged on the side surface of the flow guide pipe. The invention strengthens the advantages of the turntable extraction, strengthens the liquid drop crushing capability, improves the efficiency of the extraction tower, overcomes the defects of the extraction tower, avoids the interstage back mixing, increases the specific load of the tower and reduces the amplification effect.

Description

Interstage non-back-mixing turntable dispersive extraction device and application thereof

Technical Field

The invention relates to the technical field of liquid-liquid extraction separation, in particular to an interstage non-back-mixing turntable dispersive extraction device and application thereof.

Background

The liquid-liquid extraction unit has wide application in the fields of chemical industry, metallurgy, food, environmental protection, medicine, biology, nuclear industry and the like. The liquid-liquid extraction principle is to transfer the solute in the raw solution to the extraction phase, thereby separating the solute from the raw solution.

Liquid-liquid extraction equipment is of two types: one without external energy and the other with external energy. The liquid-liquid extraction equipment in industry has various types and great performance difference. For example, the specific load of the mixer-settler is 0.2-1 m ³ /(m ² H) the specific load of the extraction column is from 2 to 20m ³ /(m ² H) specific load of the centrifugal extractor is 40-80 m ³ /(m ² H) IS-RPB specific load 178m ³ /(m ² H) (reference: chemical process strengthening method and technology for Liu Zhi, etc. [ M ]]The method comprises the following steps: chemical industry publishers, 2018); the former two can be designed into multi-stage extraction flow, the latter two can only be used for single-stage extraction, so that the extraction tower has wider application places in industry for occasions requiring multi-stage extraction.

In order to break up the liquid drops and improve the extraction rate, extraction tower equipment with external energy is often adopted in industry, wherein a rotating disc extraction tower has a good effect on breaking up the liquid drops. However, the rotating disc extraction column has obvious disadvantages: (1) The back mixing is serious, and for a large tower, the tower height of up to 90 percent is offset by the back mixing; (2) the specific load of the column is small; (3) The amplification effect is severe and the design is difficult (reference: fiveX. Several new advances in the research and application of extraction column equipment [ J ]. Proc. Chemicals, 2013, 64 (1): 44-51).

Disclosure of Invention

Aiming at the technical problems and the defects in the field, the invention provides the interstage non-back-mixing turntable dispersing extraction device, which strengthens the advantages of turntable extraction, strengthens the liquid drop crushing capability, improves the efficiency of an extraction tower, overcomes the defects of the extraction tower, avoids interstage back mixing, increases the specific load of the tower and reduces the amplification effect.

An interstage non-back-mixing turntable dispersive extraction device comprises a tower body, wherein a rotating shaft and a plurality of guide pipes which are longitudinally arranged are arranged in the tower body, the outer side walls of the guide pipes are fixedly connected with the inner side walls of the tower body through annular interstage clapboards, and the interstage clapboards divide the interior of the tower body into a plurality of extraction stages which are longitudinally distributed;

a mixed extraction area is arranged between the adjacent guide pipes, the rotating shaft penetrates through the guide pipes, and a dispersion disc is arranged on the rotating shaft at the position of the mixed extraction area; in one extraction stage, the annular space between the mixed extraction area, the guide pipe and the inner side wall of the tower body is a light-heavy phase separation area; the mixed extraction area is communicated with the light-heavy phase separation area;

the upper and lower surfaces of the flow guide pipe are provided with annular flow guide plates, the centers of the upper and lower annular flow guide plates are respectively opened to form a light phase outlet and a heavy phase outlet, and the diameters of the light phase outlet and the heavy phase outlet are respectively smaller than the diameters of the adjacent dispersion discs;

the side surface of the draft tube is positioned above and below the interstage clapboard connected with the draft tube and is respectively provided with a heavy phase inlet and a light phase inlet; the bottom of the light-heavy phase separation zone of the extraction stage is communicated with the heavy phase inlet of the guide pipe below, and the top of the light phase separation zone of the extraction stage is communicated with the light phase inlet of the guide pipe above;

the arc-shaped guide plate is arranged in the guide pipe and is fixedly connected with the inner side wall of the guide pipe through a connecting plate;

in the guide pipe, the area enclosed by the arc guide plates is a light phase and heavy phase secondary separation area, a light phase guide channel communicated with a light phase inlet and a light phase outlet is arranged above the guide pipe, and a heavy phase guide channel communicated with a heavy phase inlet and a heavy phase outlet is arranged below the guide pipe.

In order to achieve the purpose of the invention, additional mechanical energy is applied to the dispersion disc, and the dispersion disc is rotated at high speed through the rotating shaft to strengthen the breaking capacity of liquid drops and improve the extraction efficiency of the extraction tower; the interstage backmixing is avoided by designing the light and heavy phase diversion channel, the specific load of the tower is increased by the pumping effect generated by rotation of the dispersion disc, the channeling is reduced by structural design, the effective mixing of the light and heavy phases is improved, the interstage backmixing is avoided, and the like, so that the amplification effect is reduced.

The calibers of the light phase outlet and the heavy phase outlet are respectively smaller than the diameters of the dispersion discs adjacent to the light phase outlet and the heavy phase outlet, so that the light phase and the heavy phase are close to the center of the dispersion discs when entering the mixed extraction area, and further can be fully mixed and extracted in the process of being thrown out under the rotating and centrifugal effects of the dispersion discs.

In the secondary separation area of the light phase and the heavy phase, a centrifugal field is generated under the rotation action of the rotating shaft, so that the light phase and the heavy phase are further separated, the light phase in the secondary separation area can rise to enter the light phase diversion channel, and the heavy phase can fall to enter the heavy phase diversion channel, so that back mixing is avoided.

In a preferred embodiment, the interstage non-back-mixing rotating disc dispersing and extracting device is provided with a plurality of baffles which are uniformly arranged along the circumferential direction and used for preventing the fluid from rotating in the light phase separation zone and the heavy phase separation zone, and the functions of the baffles include further improving the relative speed between two phases, thereby improving the mass transfer efficiency.

In a preferred embodiment, the interstage non-back-mixing rotating disc dispersing extraction device, the baffle plate can be provided with holes (such as a mesh plate and the like) or without holes.

The number of baffles can be designed according to the size of the tower diameter. In a preferred embodiment, the interstage non-back-mixing turntable dispersing extraction device has 2 to 10 baffles.

The number of the heavy phase inlets and the light phase inlets can be designed according to the size of the tower diameter. In a preferred embodiment, the interstage non-back-mixing turntable dispersing extraction device has 1-6 heavy phase inlets and 1-6 light phase inlets respectively and independently.

In a preferred embodiment, the interstage non-back-mixing turntable dispersing and extracting device is characterized in that the heavy phase inlet and the light phase inlet are respectively and independently and uniformly arranged along the circumferential direction.

The function of the dispersion plate comprises that the heavy phase liquid coming from the heavy phase outlet of the upper stage light-heavy phase separation area and the light phase liquid rising from the light phase outlet of the lower stage light-heavy phase separation area are conveyed to the periphery of the dispersion plate under the action of centrifugal force to carry out dispersion mixing extraction. The extraction tower can effectively avoid the problem of amplification because the dispersion mixing mass transfer mainly occurs near the peripheral area of the dispersion plate. Another function of the dispersion plate is to pump the heavy phase above and the light phase below, increasing the flow velocity of the light and heavy phases and thus the capacity of the column.

In a preferable example, the interstage no-back-mixing rotary disc dispersing extraction device comprises a disc, a turbine and the like with or without a dispersing fin on the periphery.

The diameter and the rotating speed of the dispersion disc are reasonably designed to fully disperse the dispersed phase into small droplets to improve the mass transfer speed, but the droplets cannot be too small to avoid the difficulty in separating the light phase from the heavy phase. In the interstage non-back-mixing rotary disc dispersing extraction device, the ratio of the tower diameter of the tower body to the diameter of the dispersion disc is preferably 1.5-5, more preferably 2-3.5, and the rotation speed of the dispersion disc is preferably 500-1400 rpm, more preferably 700-1000 rpm.

The light-heavy phase diversion channel is designed to reduce flow resistance and avoid interstage back mixing, and the speed of the fluid passing through the diversion channel is preferably 0.001-0.2 m/s, and more preferably 0.01-0.1 m/s.

The interstage non-back-mixing turntable dispersive extraction device can be applied to liquid-liquid extraction separation in the fields of chemical industry, metallurgy, food, environmental protection, medicine, biology, nuclear industry and the like.

The invention also provides the application of the interstage non-back-mixing turntable dispersing extraction device in liquid-liquid extraction, wherein the interstage non-back-mixing phenomenon is specifically as follows:

in the diversion pipe, the heavy phase enters the lower mixed extraction zone from the heavy phase outlet through the heavy phase diversion channel, and the entrained light phase enters the upper light phase diversion channel through the light and heavy phase secondary separation zone; the light phase enters the upper mixed extraction area from the light phase outlet through the light phase diversion channel, and the entrained heavy phase enters the lower heavy phase diversion channel through the light phase and heavy phase secondary separation area;

in the mixed extraction zone, the heavy phase from the upper draft tube and the light phase from the lower draft tube are mixed for mass transfer and extraction under the rotating dispersion action of the dispersion disc, and the formed mixed solution enters the light and heavy phase separation zone through the mixed extraction zone and is separated in the light and heavy phase separation zone due to the gravity action;

in the light and heavy phase separation zone, the light phase enters the light phase diversion channel of the previous extraction stage through the light phase inlet, and the heavy phase enters the heavy phase diversion channel of the next extraction stage through the heavy phase inlet.

As a general inventive concept, the invention also provides a method for liquid-liquid extraction by the interstage non-back-mixing turntable dispersing extraction device, heavy phases in the diversion pipe enter the mixed extraction area below from the heavy phase outlet through the heavy phase diversion channel, and entrained light phases enter the light phase diversion channel at the upper part through the light phase and heavy phase secondary separation area; the light phase enters the upper mixed extraction area from the light phase outlet through the light phase diversion channel, and the entrained heavy phase enters the lower heavy phase diversion channel through the light phase and heavy phase secondary separation area; the axial speed of the fluid passing through the heavy phase flow guide channel and the light phase flow guide channel is 0.001-0.2 m/s;

in the mixed extraction zone, the heavy phase from the upper draft tube and the light phase from the lower draft tube are mixed for mass transfer and extraction under the rotating dispersion action of the dispersion disc, and the formed mixed solution enters the light and heavy phase separation zone through the mixed extraction zone and is separated in the light and heavy phase separation zone due to the gravity action; the rotating speed of the dispersion disc is 500-1400 rpm;

in the light and heavy phase separation zone, the light phase enters the light phase diversion channel of the previous extraction stage through the light phase inlet, and the heavy phase enters the heavy phase diversion channel of the next extraction stage through the heavy phase inlet.

The interstage non-back-mixing turntable dispersing extraction device has the following characteristics:

1. the light phase and the heavy phase in the guide pipe are guided to the upper side and the lower side of the two adjacent dispersion discs through respective guide channels, and can be fully contacted when leaving the dispersion discs, so that the short circuit phenomenon of a common rotary disc extraction tower is avoided, and the mass transfer efficiency is improved.

2. After the light phase and the heavy phase are fully contacted and transferred, the light phase and the heavy phase are separated in the mixed extraction area, and the flow velocity in the mixed extraction area is low, so that the serious entrainment phenomenon can be avoided, and the serious back mixing phenomenon is also avoided.

3. After the light phase enters the diversion channel, a small amount of heavy phase carried in the light phase is further separated out to enter the heavy phase diversion channel under the action of a rotating flow field of the light and heavy phase secondary separation area; similarly, after the heavy phase enters the diversion channel, a small amount of light phase carried in the heavy phase is further separated out and enters the light phase diversion channel under the action of the rotating flow field of the light and heavy phase secondary separation zone. Therefore, the device can basically avoid the interstage back mixing phenomenon.

4. The light phase enters the previous extraction stage through the light phase flow guide channel, the heavy phase enters the next extraction stage through the heavy phase flow guide channel, and the light phase and the heavy phase do not influence each other in flow, so that the extraction production capacity is greatly improved.

5. The extraction tower can effectively avoid the problem of amplification because the dispersion mixing mass transfer mainly occurs near the peripheral area of the dispersion plate.

6. In conclusion, the extraction device has the advantages of no interstage back mixing, high extraction efficiency, high production capacity, no serious amplification problem and the like.

Compared with the prior art, the invention has the main advantages that: the specific load of the extraction device of the invention is greatly improved in extraction tower equipment, the specific load is equivalent to that of a centrifuge, namely the specific load reaches 40m ³ /(m ² H) above. The back mixing is small, the extraction efficiency is high, and the extraction rate can reach 85 to 95.8 percent by taking 6 extraction stages of extraction towers for extracting the benzoic acid in the white oil by water as an example. Compared with the common rotary disc extraction with the same size and the same operation condition, the extraction device has 30 extraction stages, but the extraction efficiency is only about 50 percent, and the extraction device has very obvious technical advantages.

Drawings

FIG. 1 is a schematic diagram of a longitudinal cross-sectional structure of an interstage non-back-mixing turntable dispersive extraction device of an embodiment;

in the figure: the dashed arrow represents the flow direction of the heavy phase, the dotted arrow represents the flow direction of the light phase, 1-tower body, 2-rotating shaft, 3-dispersion plate, 4-mixed extraction area, 5-baffle, 6-heavy phase diversion channel, 7-heavy phase inlet, 8-light phase diversion channel, 9-light phase inlet, 10-light and heavy phase secondary separation area, 11-light phase outlet, 12-heavy phase outlet, 13-connecting plate, 14-interstage baffle, 15-light and heavy phase separation area, 16-annular guide plate, 17-extraction stage, 18-guide pipe and 19-arc guide plate.

Detailed Description

The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.

As shown in fig. 1, the interstage non-back-mixing turntable dispersive extraction device of the embodiment includes a tower body 1, a rotating shaft 2 and a plurality of longitudinally arranged draft tubes 18 are arranged in the tower body 1, outer side walls of the draft tubes 18 are fixedly connected with inner side walls of the tower body 1 through annular interstage partition plates 14, and the interstage partition plates 14 divide the inside of the tower body 1 into a plurality of extraction stages 17 which are longitudinally distributed.

A mixed extraction area 4 is arranged between the adjacent draft tubes 18, the rotating shaft 2 penetrates through the draft tubes 18, and a dispersion disc 3 is arranged on the rotating shaft 2 and positioned in the mixed extraction area 4; in an extraction stage 17, the annular space between the mixed extraction area 4, the draft tube 18 and the inner side wall of the tower body 1 is a light-heavy phase separation area 15; the mixed extraction zone 4 is communicated with a light-heavy phase separation zone 15.

The upper and lower surfaces of the draft tube 18 are both provided with an annular guide plate 16, the centers of the upper and lower annular guide plates 16 are respectively opened to form a light phase outlet 11 and a heavy phase outlet 12, and the calibers of the light phase outlet 11 and the heavy phase outlet 12 are respectively smaller than the diameters of the dispersion discs 3 adjacent to the light phase outlet and the heavy phase outlet.

The side surface of the draft tube 18 is positioned above and below the interstage clapboard 14 connected with the draft tube and is respectively provided with a heavy phase inlet 7 and a light phase inlet 9; the bottom of the light-heavy phase separation zone 15 of the extraction stage 17 is communicated with the heavy phase inlet 7 of the draft tube 18 below, and the top is communicated with the light phase inlet 9 of the draft tube 18 above.

The inside arc guide plate 19 that is equipped with of honeycomb duct 18, arc guide plate 19 pass through connecting plate 13 and honeycomb duct 18 inside wall fixed connection.

In the draft tube 18, the area enclosed by the arc-shaped guide plates 19 is a light phase and heavy phase secondary separation area 10, the upper part of the area is provided with a light phase guide channel 8 communicated with a light phase inlet 9 and a light phase outlet 11, and the lower part of the area is provided with a heavy phase guide channel 6 communicated with a heavy phase inlet 7 and a heavy phase outlet 12.

The light-heavy phase separation area 15 is internally provided with a plurality of baffles 5 which are uniformly arranged along the circumferential direction and used for preventing the fluid from rotating. The baffle 5 may be perforated (e.g., mesh plate, etc.) or non-perforated. The number of the baffles can be designed according to the size of the tower diameter, such as 2-10.

In one draft tube 18, the number of the heavy phase inlets 7 and the number of the light phase inlets 8 can be designed according to the size of the tower diameter, for example, the number of the heavy phase inlets 7 and the number of the light phase inlets 8 are respectively 1-6, and the heavy phase inlets 7 and the light phase inlets 9 can be respectively and independently uniformly arranged along the circumferential direction.

The dispersion disc 3 includes a disc, a turbine, etc., with or without dispersion fins on the periphery.

The ratio of the tower diameter of the tower body 1 to the diameter of the dispersion disc 3 is 1.5-5.

When the interstage non-backmixing turntable dispersion extraction device of the embodiment is applied to liquid-liquid extraction, the interstage non-backmixing phenomenon is specific:

in the draft tube 18, the heavy phase enters the lower mixed extraction zone 4 from the heavy phase outlet 12 through the heavy phase diversion channel 6, wherein the entrained light phase enters the upper light phase diversion channel 8 through the light and heavy phase secondary separation zone 10; the light phase enters the upper mixed extraction zone 4 from a light phase outlet 11 through a light phase diversion channel 8, and the entrained heavy phase enters the lower heavy phase diversion channel 6 through a light phase and heavy phase secondary separation zone 10; the axial speed of the fluid passing through the heavy phase flow guide channel 6 and the light phase flow guide channel 8 is 0.001-0.2 m/s;

in the mixed extraction area 4, the heavy phase from the upper draft tube 18 and the light phase from the lower draft tube 18 are mixed for mass transfer and extraction under the rotating dispersion action of the dispersion disc 3, and the formed mixed liquid enters the light phase and heavy phase separation area 15 through the mixed extraction area 4 and is separated into the light phase and the heavy phase in the light phase and heavy phase separation area 15 under the action of gravity; the rotating speed of the dispersion disc 3 is 500-1400 rpm;

in the light and heavy phase separation zone 15, the light phase enters the light phase diversion channel 8 of the upper stage of extraction stage 17 through the light phase inlet 9, and the heavy phase enters the heavy phase diversion channel 6 of the lower stage of extraction stage 17 through the heavy phase inlet 7.

The interstage non-back-mixing turntable dispersion extraction device is used for the following specific application, if no special description is given, the speed of fluid passing through the flow guide channel refers to the axial speed, the light phase is composed of white oil solution containing benzoic acid with the mass percentage of 0.0833%, and the heavy phase is water.

Application example 1

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 2.5. The dispersion disc speed was 500rpm. The speed of the light phase passing through the diversion channel is 0.0024m/s, and the speed of the heavy phase passing through the diversion channel is 0.0059m/s. Specific load of 37.7m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 66.3%.

Application example 2

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 2.5. The dispersion disc speed was 700rpm. The speed of the light phase passing through the diversion channel is 0.0024m/s, and the speed of the heavy phase passing through the diversion channel is 0.0059m/s. Specific load of 37.7m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 84%.

Application example 3

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 2.5. The dispersion disc speed was 900rpm. The speed of the light phase passing through the diversion channel is 0.0024m/s, and the speed of the heavy phase passing through the diversion channel is 0.0059m/s. Specific load of 37.7m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 95.8%.

Application example 4

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 2.5. The dispersion disc speed was 900rpm. The speed of the light phase passing through the diversion channel is 0.003m/s, and the speed of the heavy phase passing through the diversion channel is 0.0059m/s. Specific load of 40.4m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 94.03%.

Application example 5

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 2.5. The dispersion disc speed was 900rpm. The speed of the light phase passing through the diversion channel is 0.0063m/s, and the speed of the heavy phase passing through the diversion channel is 0.0059m/s. Specific load of 55.2m ³ /(m ² H). A total of 6 extraction stages. As a result, the extraction rate was 85.3%.

Application example 6

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 3.5. The dispersion disc speed was 500rpm. The speed of the light phase passing through the diversion channel is 0.0028m/s, and the speed of the heavy phase passing through the diversion channel is 0.0057m/s. Specific load of 39.7m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 64.6%.

Application example 7

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 3.5. The dispersion disc speed was 700rpm. The speed of the light phase passing through the diversion channel is 0.0028m/s, and the speed of the heavy phase passing through the diversion channel is 0.0057m/s. Specific load of 39.7m ³ /(m ² H). There were 6 extraction stages in total.As a result, the extraction rate was 81.5%.

Application example 8

The ratio of the diameter of the extraction tower to the diameter of the dispersion disc is 3.5. The dispersion disc speed was 900rpm. The speed of the light phase passing through the diversion channel is 0.0028m/s, and the speed of the heavy phase passing through the diversion channel is 0.0057m/s. Specific load of 39.7m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 94.1%.

Application example 9

The ratio of the diameter of the extraction tower to the diameter of the dispersion plate is 3.5. The dispersion disc speed was 900rpm. The speed of the light phase passing through the diversion channel is 0.0031m/s, and the speed of the heavy phase passing through the diversion channel is 0.0061m/s. Specific load of 43.8m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 93.53%.

Application example 10

The ratio of the diameter of the extraction tower to the diameter of the dispersion plate is 3.5. The dispersion disc speed was 900rpm. The speed of the light phase passing through the diversion channel is 0.0065m/s, and the speed of the heavy phase passing through the diversion channel is 0.0061m/s. Specific load of 56.9m ³ /(m ² H). There were 6 extraction stages in total. As a result, the extraction rate was 84.7%.

Furthermore, it will be appreciated that after reading the above description of the invention, those skilled in the art may make various changes or modifications to the invention or use it in other liquid-liquid extraction systems, and that such equivalents also fall within the scope of the claims appended hereto.

Claims (10)

1. An interstage non-backmixing turntable dispersing extraction device is characterized by comprising a tower body (1), wherein a rotating shaft (2) and a plurality of guide pipes (18) which are longitudinally arranged are arranged in the tower body (1), the outer side walls of the guide pipes (18) are fixedly connected with the inner side walls of the tower body (1) through annular interstage partition plates (14), and the interstage partition plates (14) divide the interior of the tower body (1) into a plurality of extraction stages (17) which are longitudinally distributed;

a mixed extraction area (4) is arranged between the adjacent guide pipes (18), the rotating shaft (2) penetrates through the guide pipes (18), and a dispersion disc (3) is arranged on the rotating shaft (2) at the position of the mixed extraction area (4); in an extraction stage (17), the annular space between the mixed extraction area (4), the draft tube (18) and the inner side wall of the tower body (1) is a light-heavy phase separation area (15); the mixed extraction zone (4) is communicated with the light-heavy phase separation zone (15);

annular guide plates (16) are arranged on the upper surface and the lower surface of the guide pipe (18), the centers of the upper annular guide plate and the lower annular guide plate (16) are respectively opened to form a light phase outlet (11) and a heavy phase outlet (12), and the calibers of the light phase outlet (11) and the heavy phase outlet (12) are respectively smaller than the diameters of the adjacent dispersion discs (3);

the side surface of the draft tube (18) is positioned above and below the interstage clapboard (14) connected with the draft tube and is respectively provided with a heavy phase inlet (7) and a light phase inlet (9); the bottom of a light-heavy phase separation zone (15) of the extraction stage (17) is communicated with a heavy phase inlet (7) of a guide pipe (18) below, and the top of the light phase separation zone is communicated with a light phase inlet (9) of the guide pipe (18) above;

an arc-shaped guide plate (19) is arranged in the guide pipe (18), and the arc-shaped guide plate (19) is fixedly connected with the inner side wall of the guide pipe (18) through a connecting plate (13);

in the draft tube (18), the area enclosed by the arc-shaped guide plates (19) is a light-phase and heavy-phase secondary separation area (10), the upper part of the draft tube is provided with a light-phase guide channel (8) communicated with the light-phase inlet (9) and the light-phase outlet (11), and the lower part of the draft tube is provided with a heavy-phase guide channel (6) communicated with the heavy-phase inlet (7) and the heavy-phase outlet (12).

2. The interstage non-back-mixing turntable dispersing extraction device according to the claim 1, characterized in that a plurality of baffles (5) which are uniformly arranged along the circumference direction and used for preventing the fluid from rotating are arranged in the light and heavy phase separation zone (15).

3. The interstage non-backmixing rotating disc dispersive extraction device according to claim 2, characterized in that the baffle (5) is perforated or not.

4. The interstage non-back-mixing turntable dispersive extraction device according to claim 2 or 3, characterized in that the number of baffles (5) is 2 to 10.

5. The interstage non-back-mixing turntable dispersive extraction device according to claim 1, characterized in that the number of the heavy phase inlets (7) and the number of the light phase inlets (9) are 1 to 6 respectively.

6. The interstage non-back-mixing turntable dispersive extraction device according to claim 1 or 5, characterized in that the heavy phase inlet (7) and the light phase inlet (9) are respectively and independently arranged uniformly along the circumferential direction.

7. The interstage non-backmixing rotary disc dispersive extraction device according to claim 1, characterized in that the dispersive disc (3) comprises a disc, turbine with or without a peripheral dispersive fin.

8. The interstage non-back-mixing rotating disc dispersive extraction device according to claim 1 or 7, characterized in that the ratio of the tower diameter of the tower body (1) to the diameter of the dispersion disc (3) is 1.5-5.

9. Use of the interstage non-back-mixing rotating disc dispersed extraction device according to any one of claims 1 to 8 in liquid-liquid extraction, characterized in that interstage non back-mixing phenomenon, in particular:

in the draft tube (18), the heavy phase enters the lower mixed extraction zone (4) from the heavy phase outlet (12) through the heavy phase draft channel (6), wherein the entrained light phase enters the upper light phase draft channel (8) through the light phase and heavy phase secondary separation zone (10); the light phase enters the upper mixed extraction zone (4) from a light phase outlet (11) through a light phase flow guide channel (8), and the entrained heavy phase enters a lower heavy phase flow guide channel (6) through a light phase and heavy phase secondary separation zone (10);

in the mixed extraction area (4), the heavy phase from an upper draft tube (18) and the light phase from a lower draft tube (18) are mixed for mass transfer and extraction under the rotating dispersion action of a dispersion disc (3), and the formed mixed solution enters a light and heavy phase separation area (15) through the mixed extraction area (4) and is separated in the light and heavy phase separation area (15) under the action of gravity;

in the light and heavy phase separation zone (15), the light phase enters the light phase diversion channel (8) of the upper stage extraction stage (17) through the light phase inlet (9), and the heavy phase enters the heavy phase diversion channel (6) of the lower stage extraction stage (17) through the heavy phase inlet (7).

10. A method for liquid-liquid extraction by using the interstage non-back-mixing turntable dispersion extraction device of any one of claims 1 to 8, characterized in that, in the diversion pipe (18), the heavy phase enters the lower mixing extraction zone (4) from the heavy phase outlet (12) through the heavy phase diversion channel (6), wherein the entrained light phase enters the upper light phase diversion channel (8) through the light-heavy phase secondary separation zone (10); the light phase enters the upper mixed extraction zone (4) from a light phase outlet (11) through a light phase flow guide channel (8), and the entrained heavy phase enters a lower heavy phase flow guide channel (6) through a light phase and heavy phase secondary separation zone (10); the axial speed of the fluid passing through the heavy phase flow guide channel (6) and the light phase flow guide channel (8) is 0.001-0.2 m/s;

in the mixed extraction area (4), the heavy phase from an upper draft tube (18) and the light phase from a lower draft tube (18) are mixed for mass transfer and extraction under the rotating dispersion action of a dispersion disc (3), and the formed mixed solution enters a light and heavy phase separation area (15) through the mixed extraction area (4) and is separated in the light and heavy phase separation area (15) under the action of gravity; the rotating speed of the dispersion disc (3) is 500-1400 rpm;

in the light and heavy phase separation zone (15), the light phase enters the light phase diversion channel (8) of the upper stage extraction stage (17) through the light phase inlet (9), and the heavy phase enters the heavy phase diversion channel (6) of the lower stage extraction stage (17) through the heavy phase inlet (7).

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