An inter-stage non-backmixing rotary disk dispersion extraction device and its application

Abstract

The present invention discloses an inter-stage non-backmixing rotary disk dispersion extraction device and its application in liquid-liquid extraction. The device includes a tower body, in which a rotating shaft and a plurality of longitudinally arranged diversion tubes are provided. The outer side wall of the diversion tube is fixedly connected to the inner side wall of the tower body through an annular stage partition plate, and the stage partition plate divides the interior of the tower body into a plurality of longitudinally distributed extraction stages; the area between adjacent diversion tubes is a mixing and extraction area, the rotating shaft passes through the diversion tube and a dispersion disk is arranged at the position of the rotating shaft in the mixing and extraction area; in one extraction stage, the annulus between the mixing and extraction area, the diversion tube and the inner side wall of the tower body is a heavy-light phase separation area; a heavy phase inlet and a light phase inlet are respectively arranged above and below the side surface of the diversion tube and at the position connected to the stage partition plate. The present invention strengthens the advantages of rotary disk extraction, enhances the droplet breakup ability, improves the efficiency of the extraction tower, and at the same time overcomes the disadvantages of the extraction tower, avoids inter-stage backmixing, increases the specific load of the tower, and reduces the scale-up effect.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid-liquid extraction separation, and particularly relates to a disk dispersion extraction device without inter-stage backmixing and its application. Background Art

[0002] Liquid-liquid extraction units are widely used in fields such as chemical engineering, metallurgy, food, environmental protection, medicine, biology, and nuclear industry. The principle of liquid-liquid extraction is to transfer the solute in the original solution to the extraction phase, thereby separating the solute from the original solution.

[0003] There are two types of liquid-liquid extraction equipment: one is without external energy, and the other is with external energy. There are many types of liquid-liquid extraction equipment in industry, and their performances vary greatly. For example, the specific load of a mixer-settler is 0.2 - 1 m 3 / (m 2 ·h), the specific load of an extraction column is 2 - 20 m 3 / (m 2 ·h), the specific load of a centrifugal extractor is 40 - 80 m 3 / (m 2 ·h), and the specific load of an IS-RPB is 178 m 3 / (m 2 ·h) (Reference: Liu Youzhi, et al. Methods and Technologies for Chemical Process Intensification [M]. Beijing: Chemical Industry Press, 2018); the first two can be designed into a multi-stage extraction process, while the latter two can only perform single-stage extraction. Therefore, for occasions that require multi-stage extraction, extraction columns have a wider application in industry.

[0004] In order to break liquid droplets to improve the extraction rate, extraction column equipment with external energy is often used in industry, and among them, the disk extraction column has a good effect on breaking liquid droplets. However, the disk extraction column has obvious disadvantages: (1) Severe backmixing, and up to 90% of the tower height of a large tower is offset by backmixing; (2) The specific load of the tower is small; (3) Severe scale-up effect and difficult design (Reference: Fei Weiyang. Some new progress in the research and application of extraction column equipment [J]. Journal of Chemical Industry and Engineering (China), 2013, 64(1): 44 - 51). Summary of the Invention

[0005] Aiming at the above technical problems and the deficiencies in this field, the present invention provides a disk dispersion extraction device without inter-stage backmixing, which on the one hand strengthens the advantages of disk extraction, enhances the liquid droplet breaking ability, and improves the extraction column efficiency, and on the other hand overcomes the disadvantages of the extraction column, avoids inter-stage backmixing, increases the specific load of the tower, and reduces the scale-up effect.

[0006] A stage - without - back - mixing rotary disk dispersion extraction device, comprising a tower body. A rotating shaft and a plurality of longitudinally arranged diversion pipes are provided inside the tower body. The outer side wall of the diversion pipe is fixedly connected to the inner side wall of the tower body through an annular stage partition plate. The stage partition plate divides the interior of the tower body into a plurality of longitudinally distributed extraction stages;

[0007] The area between adjacent diversion pipes is a mixing and extraction area. The rotating shaft passes through the diversion pipe, and a dispersion disk is arranged at the position of the rotating shaft in the mixing and extraction area. In one extraction stage, the annular gap between the mixing and extraction area, the diversion pipe and the inner side wall of the tower body is a light - and - heavy - phase separation area; the mixing and extraction area is communicated with the light - and - heavy - phase separation area;

[0008] Annular diversion plates are arranged on both the upper and lower surfaces of the diversion pipe. The centers of the upper and lower annular diversion plates are respectively opened to form a light - phase outlet and a heavy - phase outlet. The diameters of the light - phase outlet and the heavy - phase outlet are respectively smaller than the diameters of the adjacent dispersion disks;

[0009] A heavy - phase inlet and a light - phase inlet are respectively arranged on the side of the diversion pipe above and below the stage partition plate connected thereto. The bottom of the light - and - heavy - phase separation area of the extraction stage is communicated with the heavy - phase inlet of the lower diversion pipe, and the top is communicated with the light - phase inlet of the upper diversion pipe;

[0010] An arc - shaped diversion plate is arranged inside the diversion pipe. The arc - shaped diversion plate is fixedly connected to the inner side wall of the diversion pipe through a connecting plate;

[0011] Inside the diversion pipe, the area enclosed by the arc - shaped diversion plate is a light - and - heavy - phase secondary separation area. Above it is a light - phase diversion channel communicated with the light - phase inlet and the light - phase outlet, and below it is a heavy - phase diversion channel communicated with the heavy - phase inlet and the heavy - phase outlet.

[0012] To achieve the purpose of the present invention, external mechanical energy is applied to the dispersion disk, and the dispersion disk is rotated at a high speed through the rotating shaft to enhance the droplet - breaking ability and improve the extraction efficiency of the extraction tower; by designing the light - and - heavy - phase diversion channels, inter - stage back - mixing is avoided. The pumping effect generated by the rotation of the dispersion disk increases the specific load of the tower. Through the structural design, channeling is reduced, the effective mixing of the light and heavy phases is improved, and inter - stage back - mixing is avoided, etc., so as to reduce the scale - up effect.

[0013] The diameters of the light - phase outlet and the heavy - phase outlet are respectively smaller than the diameters of the adjacent dispersion disks, which can make the light phase and the heavy phase close to the center of the dispersion disk when entering the mixing and extraction area. Furthermore, they can be fully mixed and extracted during the process of being thrown outwards under the rotation and centrifugal action of the dispersion disk.

[0014] In the light - and - heavy - phase secondary separation area, due to the centrifugal field generated by the rotation of the rotating shaft, the light and heavy phases are further separated. The light phase in this area will rise and enter the light - phase diversion channel, and the heavy phase will descend and enter the heavy - phase diversion channel, avoiding back - mixing.

[0015] In a preferred embodiment, in the inter-stage non-backmixing rotary disk dispersion extraction device, there are a number of baffles arranged circumferentially and evenly in the heavy-light phase separation zone for preventing fluid rotation, and its functions include further increasing the relative velocity between the two phases, thereby improving the mass transfer efficiency.

[0016] In a preferred embodiment, in the inter-stage non-backmixing rotary disk dispersion extraction device, the baffles can be perforated (such as a mesh plate, etc.) or non-perforated.

[0017] The number of baffles can be designed according to the column diameter. In a preferred embodiment, in the inter-stage non-backmixing rotary disk dispersion extraction device, the number of baffles is 2 - 10.

[0018] The number of heavy phase inlets and light phase inlets can be designed according to the column diameter. In a preferred embodiment, in the inter-stage non-backmixing rotary disk dispersion extraction device, the heavy phase inlets and light phase inlets are each independently 1 - 6.

[0019] In a preferred embodiment, in the inter-stage non-backmixing rotary disk dispersion extraction device, the heavy phase inlets and light phase inlets are each independently arranged circumferentially and evenly.

[0020] The functions of the dispersion disk include transporting the heavy phase liquid coming down from the heavy phase outlet of the upper-stage heavy-light phase separation zone and the light phase liquid rising from the light phase outlet of the lower-stage heavy-light phase separation zone to the outer periphery of the dispersion disk under the action of centrifugal force for dispersion mixing extraction. Since the dispersion mixing mass transfer mainly occurs in the vicinity of the outer peripheral area of the dispersion disk, this extraction column can effectively avoid the problem of scale-up. Another function of the dispersion disk is to suck the heavy phase above and the light phase below, increasing the flow velocity of the light and heavy phases, and thus improving the processing capacity of the column.

[0021] In a preferred embodiment, in the inter-stage non-backmixing rotary disk dispersion extraction device, the dispersion disk includes a disk with or without dispersion fins at the periphery, a turbine, etc.

[0022] It is necessary to reasonably design the diameter and rotation speed of the dispersion disk to fully disperse the dispersed phase into small droplets to increase the mass transfer rate, but the droplets should not be too small to avoid difficulty in separating the heavy and light phases. In the inter-stage non-backmixing rotary disk dispersion extraction device, the ratio of the column diameter to the dispersion disk diameter is preferably 1.5 - 5:1, more preferably 2 - 3.5:1, and the rotation speed of the dispersion disk is preferably 500 - 1400 rpm, more preferably 700 - 1000 rpm.

[0023] The design of the heavy-light phase diversion channels is based on the principle of reducing the flow resistance and avoiding inter-stage backmixing. The velocity of the fluid passing through the diversion channels is preferably 0.001 - 0.2 m / s, more preferably 0.01 - 0.1 m / s.

[0024] The inter-stage non-backmixing rotary disk dispersion extraction device of the present invention can be applied to liquid-liquid extraction and separation in the fields of chemical engineering, metallurgy, food, environmental protection, medicine, biology, nuclear industry, etc.

[0025] The present invention also provides the application of the inter-stage non-backmixing rotary disk dispersion extraction device in liquid-liquid extraction, with no backmixing phenomenon between stages. Specifically:

[0026] In the draft tube, the heavy phase enters the lower mixing and extraction zone from the heavy-phase outlet through the heavy-phase draft channel, and the entrained light phase enters the upper light-phase draft channel through the heavy-light phase secondary separation zone; the light phase enters the upper mixing and extraction zone from the light-phase outlet through the light-phase draft channel, and the entrained heavy phase enters the lower heavy-phase draft channel through the heavy-light phase secondary separation zone.

[0027] In the mixing and extraction zone, the heavy phase from the upper draft tube and the light phase from the lower draft tube are mixed and mass-transferred and extracted under the rotating and dispersing action of the dispersion disk, and the formed mixed liquid enters the heavy-light phase separation zone through the mixing and extraction zone, and the heavy and light phases are separated due to gravity in the heavy-light phase separation zone.

[0028] In the heavy-light phase separation zone, the light phase enters the light-phase draft channel of the upper extraction stage through the light-phase inlet, and the heavy phase enters the heavy-phase draft channel of the lower extraction stage through the heavy-phase inlet.

[0029] As a general inventive concept, the present invention also provides a method for liquid-liquid extraction using the inter-stage non-backmixing rotary disk dispersion extraction device. In the draft tube, the heavy phase enters the lower mixing and extraction zone from the heavy-phase outlet through the heavy-phase draft channel, and the entrained light phase enters the upper light-phase draft channel through the heavy-light phase secondary separation zone; the light phase enters the upper mixing and extraction zone from the light-phase outlet through the light-phase draft channel, and the entrained heavy phase enters the lower heavy-phase draft channel through the heavy-light phase secondary separation zone; the axial velocity of the fluid passing through the heavy-phase draft channel and the light-phase draft channel is 0.001 - 0.2 m / s.

[0030] In the mixing and extraction zone, the heavy phase from the upper draft tube and the light phase from the lower draft tube are mixed and mass-transferred and extracted under the rotating and dispersing action of the dispersion disk, and the formed mixed liquid enters the heavy-light phase separation zone through the mixing and extraction zone, and the heavy and light phases are separated due to gravity in the heavy-light phase separation zone; the rotation speed of the dispersion disk is 500 - 1400 rpm.

[0031] In the heavy-light phase separation zone, the light phase enters the light-phase draft channel of the upper extraction stage through the light-phase inlet, and the heavy phase enters the heavy-phase draft channel of the lower extraction stage through the heavy-phase inlet.

[0032] The inter-stage non-backmixing rotary disk dispersion extraction device of the present invention has the following characteristics:

[0033] 1. Direct the light and heavy phases in the diversion pipe to the upper and lower sides of two adjacent dispersion plates through their respective diversion channels. When leaving the dispersion plates, the light and heavy phases can come into full contact, avoiding the short-circuit phenomenon in a general rotating disk extraction column and improving the mass transfer efficiency.

[0034] 2. After the light and heavy phases come into full contact and mass transfer occurs, they are separated in the mixing extraction zone. The flow rate in the mixing extraction zone is relatively low, which can avoid serious entrainment phenomenon and thus also avoid serious backmixing phenomenon.

[0035] 3. After the light phase enters the diversion channel, under the action of the rotating flow field in the light and heavy phase secondary separation zone, a small amount of heavy phase entrained in the light phase is further separated and enters the heavy phase diversion channel; similarly, after the heavy phase enters the diversion channel, under the action of the rotating flow field in the light and heavy phase secondary separation zone, a small amount of light phase entrained in the heavy phase is further separated and enters the light phase diversion channel. Therefore, the device of the present invention can basically avoid the inter-stage backmixing phenomenon.

[0036] 4. The light phase enters the previous extraction stage through the light phase diversion channel, while the heavy phase enters the next extraction stage through the heavy phase diversion channel. The flows of the light and heavy phases have no influence on each other, and this feature greatly improves the production capacity of extraction.

[0037] 5. Since the dispersion and mixing mass transfer mainly occurs near the outer peripheral area of the dispersion plate, this extraction column can effectively avoid the problem of scale-up.

[0038] 6. In summary, the extraction device of the present invention has the advantages of no inter-stage backmixing, high extraction efficiency, large production capacity, and no serious scale-up problem.

[0039] Compared with the prior art, the main advantages of the present invention include: the specific load of the extraction device of the present invention is greatly improved among extraction column equipment, and the specific load is comparable to that of a centrifuge, that is, the specific load reaches more than 40 m 3 / (m 2 ·h). The backmixing is small and the extraction efficiency is high. Taking the extraction of benzoic acid from white oil by a 6-stage extraction column as an example, the extraction rate can reach 85% - 95.8%. Compared with a common rotating disk extraction under the same size and operating conditions, the number of extraction stages is 30, but the extraction efficiency is only about 50%. The extraction device of the present invention has very obvious technical advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a longitudinal sectional structure schematic diagram of the inter-stage backmixing-free rotating disk dispersion extraction device for the embodiment;

[0041] In the figure: The dash arrow represents the flow direction of the heavy phase, and the dotted arrow represents the flow direction of the light phase. 1 - tower body, 2 - rotating shaft, 3 - dispersion disk, 4 - mixing extraction zone, 5 - baffle, 6 - heavy phase diversion channel, 7 - heavy phase inlet, 8 - light phase diversion channel, 9 - light phase inlet, 10 - primary separation zone for heavy and light phases, 11 - light phase outlet, 12 - heavy phase outlet, 13 - connecting plate, 14 - stage spacer, 15 - separation zone for heavy and light phases, 16 - annular diversion plate, 17 - extraction stage, 18 - diversion pipe, 19 - arc-shaped diversion plate. Detailed implementation manner

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The operation methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by the manufacturer.

[0043] As Figure 1 shown, the inter-stage non-backmixing rotary disk dispersion extraction device of this embodiment includes a tower body 1. A rotating shaft 2 and a plurality of longitudinally arranged diversion pipes 18 are provided inside the tower body 1. The outer side wall of the diversion pipe 18 is fixedly connected to the inner side wall of the tower body 1 through an annular stage spacer 14. The stage spacer 14 divides the interior of the tower body 1 into a plurality of longitudinally distributed extraction stages 17.

[0044] The area between adjacent diversion pipes 18 is a mixing extraction zone 4. The rotating shaft 2 passes through the diversion pipe 18 and a dispersion disk 3 is provided at the position of the rotating shaft 2 in the mixing extraction zone 4; in one extraction stage 17, the annular gap between the mixing extraction zone 4, the diversion pipe 18 and the inner side wall of the tower body 1 is a separation zone 15 for heavy and light phases; the mixing extraction zone 4 is communicated with the separation zone 15 for heavy and light phases.

[0045] Annular diversion plates 16 are provided on both the upper and lower surfaces of the diversion pipe 18. The centers of the upper and lower annular diversion plates 16 are respectively opened to form a light phase outlet 11 and a heavy phase outlet 12. The diameters of the light phase outlet 11 and the heavy phase outlet 12 are respectively smaller than the diameters of the adjacent dispersion disks 3.

[0046] A heavy phase inlet 7 and a light phase inlet 9 are respectively provided on the side of the diversion pipe 18 above and below the stage spacer 14 connected thereto; the bottom of the separation zone 15 for heavy and light phases of the extraction stage 17 is communicated with the heavy phase inlet 7 of the diversion pipe 18 below, and the top is communicated with the light phase inlet 9 of the diversion pipe 18 above.

[0047] An arc-shaped diversion plate 19 is provided inside the diversion pipe 18. The arc-shaped diversion plate 19 is fixedly connected to the inner side wall of the diversion pipe 18 through a connecting plate 13.

[0048] Inside the diversion pipe 18, the area enclosed by the arc-shaped diversion plate 19 is the secondary separation area 10 for the light and heavy phases. Above it is the light-phase diversion channel 8 connected to the light-phase inlet 9 and the light-phase outlet 11, and below it is the heavy-phase diversion channel 6 connected to the heavy-phase inlet 7 and the heavy-phase outlet 12.

[0049] Inside the light and heavy phase separation area 15, several baffles 5 are arranged evenly along the circumferential direction to prevent fluid rotation. The baffles 5 can have holes (such as a mesh plate, etc.) or no holes. The number of baffles can be designed according to the tower diameter, such as 2 - 10.

[0050] In one diversion pipe 18, the number of the heavy-phase inlet 7 and the light-phase inlet 8 can be designed according to the tower diameter, such as 1 - 6 respectively and independently, and the heavy-phase inlet 7 and the light-phase inlet 9 can be arranged evenly along the circumferential direction respectively and independently.

[0051] The dispersion disk 3 includes a disk with or without dispersion fins around the perimeter, a turbine, etc.

[0052] The ratio of the tower diameter of the tower body 1 to the diameter of the dispersion disk 3 is 1.5 - 5:1.

[0053] When the inter-stage non-backmixing rotary disk dispersion extraction device of this embodiment is applied to liquid-liquid extraction, there is no inter-stage backmixing phenomenon. Specifically:

[0054] Inside the diversion pipe 18, the heavy phase enters the lower mixing extraction area 4 through the heavy-phase diversion channel 6 from the heavy-phase outlet 12, and the entrained light phase enters the upper light-phase diversion channel 8 through the secondary separation area 10 for the light and heavy phases; the light phase enters the upper mixing extraction area 4 through the light-phase diversion channel 8 from the light-phase outlet 11, and the entrained heavy phase enters the lower heavy-phase diversion channel 6 through the secondary separation area 10 for the light and heavy phases; the axial velocity of the fluid passing through the heavy-phase diversion channel 6 and the light-phase diversion channel 8 is 0.001 - 0.2 m / s;

[0055] Inside the mixing extraction area 4, the heavy phase from the upper diversion pipe 18 and the light phase from the lower diversion pipe 18 are mixed and mass-transferred and extracted under the rotational dispersion action of the dispersion disk 3, and the formed mixed liquid enters the light and heavy phase separation area 15 through the mixing extraction area 4, and the light and heavy phases are separated due to gravity in the light and heavy phase separation area 15; the rotational speed of the dispersion disk 3 is 500 - 1400 rpm;

[0056] Inside the light and heavy phase separation area 15, the light phase enters the light-phase diversion channel 8 of the upper extraction stage 17 through the light-phase inlet 9, and the heavy phase enters the heavy-phase diversion channel 6 of the lower extraction stage 17 through the heavy-phase inlet 7.

[0057] Using the above inter-stage non-backmixing rotary disk dispersion extraction device for the following applications specifically, unless otherwise specified, the velocity of the fluid passing through the diversion channel refers to the axial velocity. The light phase is a white oil solution containing 0.0833% by mass of benzoic acid, and the heavy phase is water.

[0058] Application Example 1

[0059] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 2.5:1. The rotational speed of the dispersion disk is 500 rpm. The velocity of the light phase passing through the diversion channel is 0.0024 m / s, and the velocity of the heavy phase passing through the diversion channel is 0.0059 m / s. The specific load is 37.7 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 66.3%.

[0060] Application Example 2

[0061] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 2.5:1. The rotational speed of the dispersion disk is 700 rpm. The velocity of the light phase passing through the diversion channel is 0.0024 m / s, and the velocity of the heavy phase passing through the diversion channel is 0.0059 m / s. The specific load is 37.7 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 84%.

[0062] Application Example 3

[0063] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 2.5:1. The rotational speed of the dispersion disk is 900 rpm. The velocity of the light phase passing through the diversion channel is 0.0024 m / s, and the velocity of the heavy phase passing through the diversion channel is 0.0059 m / s. The specific load is 37.7 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 95.8%.

[0064] Application Example 4

[0065] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 2.5:1. The rotational speed of the dispersion disk is 900 rpm. The velocity of the light phase passing through the diversion channel is 0.003 m / s, and the velocity of the heavy phase passing through the diversion channel is 0.0059 m / s. The specific load is 40.4 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 94.03%.

[0066] Application Example 5

[0067] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 2.5:1. The rotational speed of the dispersion disk is 900 rpm. The velocity of the light phase passing through the diversion channel is 0.0063 m / s, and the velocity of the heavy phase passing through the diversion channel is 0.0059 m / s. The specific load is 55.2 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 85.3%.

[0068] Application Example 6

[0069] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 3.5:1. The rotational speed of the dispersion disk is 500 rpm. The velocity of the light phase through the diversion channel is 0.0028 m / s, and the velocity of the heavy phase through the diversion channel is 0.0057 m / s. The specific load is 39.7 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 64.6%.

[0070] Application Example 7

[0071] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 3.5:1. The rotational speed of the dispersion disk is 700 rpm. The velocity of the light phase through the diversion channel is 0.0028 m / s, and the velocity of the heavy phase through the diversion channel is 0.0057 m / s. The specific load is 39.7 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 81.5%.

[0072] Application Example 8

[0073] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 3.5:1. The rotational speed of the dispersion disk is 900 rpm. The velocity of the light phase through the diversion channel is 0.0028 m / s, and the velocity of the heavy phase through the diversion channel is 0.0057 m / s. The specific load is 39.7 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 94.1%.

[0074] Application Example 9

[0075] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 3.5:1. The rotational speed of the dispersion disk is 900 rpm. The velocity of the light phase through the diversion channel is 0.0031 m / s, and the velocity of the heavy phase through the diversion channel is 0.0061 m / s. The specific load is 43.8 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 93.53%.

[0076] Application Example 10

[0077] The ratio of the extraction tower diameter to the diameter of the dispersion disk is 3.5:1. The rotational speed of the dispersion disk is 900 rpm. The velocity of the light phase through the diversion channel is 0.0065 m / s, and the velocity of the heavy phase through the diversion channel is 0.0061 m / s. The specific load is 56.9 m 3 / (m 2 ·h). There are a total of 6 extraction stages. The extraction rate is 84.7%.

[0078] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art can make various changes or modifications to the present invention, or apply it to other liquid-liquid extraction systems, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A stage - free back - mixing rotary disk dispersion extraction device, characterized in that, It includes a tower body (1), in which a rotating shaft (2) and a plurality of longitudinally arranged diversion pipes (18) are provided. The outer side wall of the diversion pipe (18) is fixedly connected to the inner side wall of the tower body (1) through an annular stage partition plate (14). The stage partition plate (14) divides the interior of the tower body (1) into a plurality of longitudinally distributed extraction stages (17). The area between adjacent diversion pipes (18) is a mixing and extraction area (4). The rotating shaft (2) passes through the diversion pipe (18), and a dispersion disc (3) is arranged at the position of the rotating shaft (2) in the mixing and extraction area (4). In an extraction stage (17), the annular gap between the mixing and extraction area (4), the diversion pipe (18) and the inner side wall of the tower body (1) is a light and heavy phase separation area (15). The mixing and extraction area (4) is communicated with the light and heavy phase separation area (15). Annular diversion plates (16) are arranged on both the upper and lower surfaces of the diversion pipe (18). The centers of the upper and lower annular diversion plates (16) are respectively opened to form a light phase outlet (11) and a heavy phase outlet (12). The diameters of the light phase outlet (11) and the heavy phase outlet (12) are respectively smaller than the diameters of the adjacent dispersion discs (3). Heavy phase inlets (7) and light phase inlets (9) are respectively arranged on the side surface of the diversion pipe (18) above and below the stage partition plate (14) connected thereto. The bottom of the light and heavy phase separation area (15) of the extraction stage (17) is communicated with the heavy phase inlet (7) of the lower diversion pipe (18), and the top is communicated with the light phase inlet (9) of the upper diversion pipe (18). An arc-shaped diversion plate (19) is arranged inside the diversion pipe (18). The arc-shaped diversion plate (19) is fixedly connected to the inner side wall of the diversion pipe (18) through a connecting plate (13). Inside the diversion pipe (18), the area surrounded by the arc-shaped diversion plate (19) is a light and heavy phase secondary separation area (10). Above it is a light phase diversion channel (8) communicated with the light phase inlet (9) and the light phase outlet (11), and below it is a heavy phase diversion channel (6) communicated with the heavy phase inlet (7) and the heavy phase outlet (12).

2. The inter-stage non-backmixing rotary disk dispersion extraction device according to claim 1, wherein A number of baffles (5) for preventing fluid rotation are arranged in the light and heavy phase separation area (15) and are evenly arranged along the circumferential direction.

3. The inter-stage non-backmixing rotary disk dispersion extraction device according to claim 2, wherein, The baffle (5) may have holes or no holes.

4. The inter-stage non-backmixing rotary disk dispersion extraction device according to claim 2 or 3, characterized in that The number of baffles (5) is 2 to 10.

5. The inter-stage non-backmixing rotary disk dispersion extraction device according to claim 1, wherein, The heavy phase inlets (7) and the light phase inlets (9) are respectively independently 1 to 6.

6. The inter-stage non-backmixing rotary disk dispersion extraction device according to claim 1 or 5, characterized in that, The heavy phase inlets (7) and the light phase inlets (9) are respectively independently arranged evenly along the circumferential direction.

7. The inter-stage non-backmixing rotary disk dispersion extraction device according to claim 1, wherein The dispersion disc (3) includes a disc and a turbine with or without dispersion fins on the periphery.

8. The inter-stage non-backmixing rotary disk dispersion 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 to 5:

1.

9. Use of the inter-stage non-backmixing rotary disk dispersion extraction device according to any one of claims 1 to 8 in liquid-liquid extraction, characterized in that, There is no backmixing phenomenon between stages. Specifically: Inside the diversion pipe (18), the heavy phase enters the lower mixing and extraction area (4) from the heavy phase outlet (12) through the heavy phase diversion channel (6), and the entrained light phase enters the upper light phase diversion channel (8) through the light and heavy phase secondary separation area (10). The light phase enters the upper mixing and extraction area (4) from the light phase outlet (11) through the light phase diversion channel (8), and the entrained heavy phase enters the lower heavy phase diversion channel (6) through the light and heavy phase secondary separation area (10). In the mixing extraction zone (4), the heavy phase from the upper draft tube (18) and the light phase from the lower draft tube (18) are mixed and mass - transferred and extracted under the rotational dispersion of the dispersion disk (3). The formed mixed liquid enters the heavy - light phase separation zone (15) through the mixing extraction zone (4), and the heavy and light phases are separated due to gravity in the heavy - light phase separation zone (15). In the heavy - light 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 using the inter-stage non-backmixing rotary disk dispersion extraction device according to any one of claims 1 to 8, characterized in that, In the draft tube (18), the heavy phase enters the lower mixing extraction zone (4) from the heavy - phase outlet (12) through the heavy - phase diversion channel (6), and the entrained light phase enters the upper light - phase diversion channel (8) through the heavy - light phase secondary separation zone (10); the light phase enters the upper mixing extraction zone (4) from the light - phase outlet (11) through the light - phase diversion channel (8), and the entrained heavy phase enters the lower heavy - phase diversion channel (6) through the heavy - light phase secondary separation zone (10); the axial velocity of the fluid passing through the heavy - phase diversion channel (6) and the light - phase diversion channel (8) is 0.001 - 0.2 m / s. In the mixing extraction zone (4), the heavy phase from the upper draft tube (18) and the light phase from the lower draft tube (18) are mixed and mass - transferred and extracted under the rotational dispersion of the dispersion disk (3). The formed mixed liquid enters the heavy - light phase separation zone (15) through the mixing extraction zone (4), and the heavy and light phases are separated due to gravity in the heavy - light phase separation zone (15); the rotational speed of the dispersion disk (3) is 500 - 1400 rpm. In the heavy - light 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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