A mother liquor filtration and recovery device for polyacrylamide production

Abstract

This utility model relates to the field of filtration equipment technology and discloses a mother liquor filtration and recovery device for polyacrylamide production. The device includes a filter tank, a base fixedly connected to the lower end of the filter tank, a drain pipe fixedly connected to the lower end of the filter tank and inside the base, a top cover fixedly connected to the filter tank, an upper support plate fixedly connected between the filter tank and the top cover, multiple first positioning baffles fixedly connected circumferentially inside the filter tank, a lower support plate fixedly connected inside the filter tank, and a central positioning column fixedly connected to the center of the lower support plate. An initial filter frame, multiple intermediate filter frames, and a final filter frame are arranged in series, significantly increasing the contact area and contact time between the mother liquor and activated carbon. This allows the mother liquor to fully flow through the activated carbon in each filter frame, improving the filtration and adsorption effect. Simultaneously, the filter frames are limited by the positioning baffles, enabling quick disassembly and assembly, making activated carbon cleaning and replacement more efficient. Combined with a backwash channel, it can also achieve activated carbon backwashing and reagent regeneration, improving activated carbon utilization.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and in particular to a mother liquor filtration and recovery device for polyacrylamide production. Background Technology

[0002] In the preparation of polyacrylamide, the mother liquor contains not only mechanical impurities and gel particles, but also unreacted monomers, small molecule byproducts and colored impurities, which are difficult to remove by simple filtration. By introducing activated carbon adsorption in the filtration process, its porous structure can be used to physically adsorb soluble impurities, which can effectively reduce the residual monomer content, remove color and improve the purity of the feed liquor.

[0003] The existing high molecular weight polyacrylamide production filtration device, announced under announcement number CN212440358U, includes a support frame and a filter tank fixed on the support frame. The filter tank has an inlet at the top and an outlet at the bottom. Multiple layers of horizontally fixed filter screens are vertically arranged inside the filter tank. A gas chamber covering the outlet is fitted at the bottom of the filter tank. While this existing solution effectively combines deoxygenation and filtration, the activated carbon used for filtration is filled into multiple layers on the filter screens inside the filter tank. After long-term adsorption operation, the activated carbon gradually becomes saturated and needs to be replaced or regenerated periodically. In this structure, the activated carbon is directly laid on the multiple layers of fixed filter screens without independent disassembly and removal channels. This makes it difficult for operators to quickly and conveniently clean, replenish, and replace the activated carbon, resulting in low maintenance efficiency and potential disruption to production continuity. Furthermore, due to the vertically multi-layered activated carbon arrangement, the uppermost layer has a small horizontal filtration area and bears the initial load of impurities, easily becoming saturated quickly and causing the lower layers to be underutilized. Utility Model Content

[0004] The purpose of this invention is to provide a mother liquor filtration and recovery device for polyacrylamide production, in which initial, intermediate and final filter frames are arranged in series to increase the filtration and adsorption area, allowing the mother liquor to fully contact the activated carbon, and making the filter frames easy to assemble and disassemble, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A mother liquor filtration and recovery device for polyacrylamide production includes a filter tank. A base is fixedly connected to the lower end of the filter tank. A drain pipe is fixedly connected to the lower end of the filter tank, located inside the base. A top cover is fixedly connected to the filter tank. An upper support plate is fixedly connected between the filter tank and the top cover. Multiple first positioning baffles are fixedly connected circumferentially to the inner side of the filter tank. A lower support plate is fixedly connected inside the filter tank. A central positioning column is fixedly connected to the middle of the lower support plate. Multiple second positioning baffles are fixedly connected to the outer side of the central positioning column. An initial filter frame and an end filter frame are interlaced inside the filter tank. Multiple intermediate filter frames are also interlaced inside the filter tank between the initial and end filter frames. One side of each initial, end, and intermediate filter frame is limited by two corresponding first positioning baffles. One side of each end and intermediate filter frame is limited by two corresponding first positioning baffles, and the other side is limited by two corresponding second positioning baffles.

[0007] As a further preferred embodiment of this utility model, a level gauge is fixedly connected to the outside of the filter tank for monitoring the liquid level inside the filter tank, and an inspection port is also fixedly connected to the outside of the filter tank.

[0008] As a further preferred embodiment of this utility model, a fixing ring is fixedly connected inside the top cover. The lower end face of the fixing ring abuts against the upper support plate to provide downward pressure on the upper support plate, thereby enabling the upper support plate to cooperate with the lower support plate to complete the limiting and fixing of the initial filter frame, the end filter frame, and the middle filter frame.

[0009] As a further preferred embodiment of this utility model, a first drainage channel is provided in the lower support plate.

[0010] As a further preferred embodiment of this utility model, the upper support plate is provided with a liquid inlet channel.

[0011] As a further preferred embodiment of this utility model, the central positioning column has a hollow cavity inside, the central positioning column has an L-shaped structure, and one end extends to the outside of the filter tank. The second positioning partition has multiple backwash channels, which are connected to the cavity inside the central positioning column. The backwash channels are used to backwash the activated carbon in the cavity between the initial filter frame, the intermediate filter frame and the final filter frame, and can also inject chemicals into the filter tank to regenerate the activated carbon.

[0012] As a further preferred embodiment of this utility model, a first sealing plate is fixedly connected to the side of the initial filter frame relative to the end filter frame, and a second sealing plate is fixedly connected to the side of the end filter frame relative to the initial filter frame. A second drainage channel is opened at the lower end of the end filter frame and a filter screen is fixedly connected thereto. The upper end of the initial filter frame is connected to the inlet channel cavity, and the second drainage channel is connected to the first drainage channel cavity. The upper end of the initial filter frame is connected to the inlet channel, and the second drainage channel is connected to the first drainage channel, so that the liquid entering the initial filter frame flows through multiple intermediate filter frames in sequence and then enters the end filter frame, and is discharged through the second drainage channel, the first drainage channel, and the drainage pipe. Filter screens are fixedly connected to both sides of the initial filter frame and one side of the end filter frame and intermediate filter frames, respectively. Activated carbon is filled in the initial filter frame and the intermediate filter frames of the end filter frame and the end filter frame.

[0013] As a further preferred embodiment of this utility model, a first drain valve is fixedly connected to the lower end of the drain pipe. One end of the first drain valve is fixedly connected to a second drain valve and a third drain valve via a three-way pipe. The other end of the second drain valve is connected to an external recycling device via a pipe, and the other end of the third drain valve is connected to an external sewage treatment device via a pipe. One end of the central positioning column is fixedly connected to an inlet valve and a fourth drain valve via a three-way pipe. The other end of the inlet valve is connected to an external delivery pump via a pipe, and the other end of the fourth drain valve is connected to an external suction pump via a pipe. An inlet valve is fixedly connected to the top cover, and the other end of the inlet valve is connected to an external delivery pump via a pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In this invention, the initial filter frame, multiple intermediate filter frames, and the final filter frame are arranged in series, which greatly increases the contact area and contact time between the mother liquor and the activated carbon, allowing the mother liquor to flow fully through the activated carbon in each filter frame, thereby improving the filtration and adsorption effect. At the same time, the filter frames are limited by positioning baffles, which can achieve quick disassembly and assembly, making the cleaning and replacement of activated carbon more efficient. With the backwash channel, the activated carbon can also be backwashed and the reagent can be regenerated, improving the utilization rate of activated carbon. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the filter tank of this utility model;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a schematic diagram showing the disassembled main structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the assembly structure of the central positioning column and the lower support plate of this utility model;

[0021] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0022] Figure 7 This is a schematic diagram of the first combined state of the initial filter frame, the final filter frame, and the intermediate filter frame of this utility model;

[0023] Figure 8 This is a schematic diagram of the second combined state of the initial filter frame, the final filter frame, and the intermediate filter frame of this utility model;

[0024] Figure 9 This is a schematic diagram showing the inlet, outlet, and backwash valves of this utility model.

[0025] In the diagram: 1. Filter tank; 2. Base; 3. Drain pipe; 4. Top cover; 5. Lower support plate; 6. Upper support plate; 7. First positioning partition; 8. Central positioning column; 9. Second positioning partition; 10. Initial filter frame; 11. End filter frame; 12. Intermediate filter frame; 13. Inspection port; 14. Level gauge; 15. Fixing ring; 16. First drain channel; 17. Backflushing channel; 18. First sealing plate; 19. Second sealing plate; 20. Second drain channel; 21. Inlet channel; 22. First drain valve; 23. Second drain valve; 24. Third drain valve; 25. Water inlet valve; 26. Inlet valve; 27. Fourth drain valve. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] like Figures 1-9As shown, this utility model provides a mother liquor filtration and recovery device for polyacrylamide production, including a filter tank 1, a base 2 fixedly connected to the lower end of the filter tank 1, a drain pipe 3 fixedly connected to the lower end of the filter tank 1 and located inside the base 2, a top cover 4 fixedly connected to the filter tank 1, an upper support plate 6 fixedly connected between the filter tank 1 and the top cover 4, a plurality of first positioning partitions 7 fixedly connected circumferentially inside the filter tank 1, a lower support plate 5 fixedly connected inside the filter tank 1, and a central positioning column 8 fixedly connected to the middle of the lower support plate 5. Multiple second positioning partitions 9 are fixedly connected to the outside of the core positioning column 8. An initial filter frame 10 and an end filter frame 11 are interspersed inside the filter tank 1. Multiple intermediate filter frames 12 are also interspersed inside the filter tank 1 located between the initial filter frame 10 and the end filter frame 11. One side of the initial filter frame 10, the end filter frame 11, and the intermediate filter frames 12 is limited by two corresponding first positioning partitions 7. One side of the end filter frame 11 and the intermediate filter frames 12 is limited by two corresponding first positioning partitions 7, and the other side is limited by two corresponding second positioning partitions 9.

[0028] like Figures 1-3 As shown, a level gauge 14 is fixedly connected to the outside of the filter tank 1 to monitor the liquid level inside the filter tank 1. An inspection port 13 is also fixedly connected to the outside of the filter tank 1. A fixing ring 15 is fixedly connected inside the top cover 4. The lower end face of the fixing ring 15 abuts against the upper support plate 6 to provide downward pressure to the upper support plate 6, so that the upper support plate 6 cooperates with the lower support plate 5 to complete the limiting and fixing of the initial filter frame 10, the end filter frame 11, and the intermediate filter frame 12.

[0029] like Figures 4-5 As shown, the lower support plate 5 has a first drainage channel 16, and the upper support plate 6 has a liquid inlet channel 21.

[0030] like Figures 4-8As shown, the central positioning column 8 has a hollow cavity inside. The central positioning column 8 has an L-shaped structure, with one end extending to the outside of the filter tank 1. The second positioning partition 9 has multiple backwash channels 17, which are connected to the cavity inside the central positioning column 8. The backwash channels 17 are used to backwash the activated carbon in the cavity between the initial filter frame 10, the intermediate filter frame 12, and the final filter frame 11. At the same time, chemicals can be injected into the filter tank 1 to regenerate the activated carbon. The initial filter frame 10 is fixed on one side relative to the final filter frame 11. A first sealing plate 18 is connected, and a second sealing plate 19 is fixedly connected to the end filter frame 11 on the side opposite to the initial filter frame 10. A second drainage channel 20 is opened at the lower end of the end filter frame 11 and a filter screen is fixedly connected thereto. The upper end of the initial filter frame 10 is connected to the cavity of the inlet channel 21, and the second drainage channel 20 is connected to the cavity of the first drainage channel 16. The upper end of the initial filter frame 10 is connected to the inlet channel 21, and the second drainage channel 20 is connected to the first drainage channel 16, so that the liquid entering the initial filter frame 10 is... After passing through multiple intermediate filter frames 12, the liquid enters the final filter frame 11, and then exits through the second drain channel 20, the first drain channel 16, and the drain pipe 3. Filter screens are fixedly connected to both sides of the initial filter frame 10 and one side of the final filter frame 11 and intermediate filter frames 12, respectively. Activated carbon is filled in the initial filter frame 10, the final filter frame 11, and the intermediate filter frame 12. The lower end of the drain pipe 3 is fixedly connected to the first drain valve 22. One end of the first drain valve 22 is fixedly connected to the second drain valve 23 and the third drain valve through a three-way pipe. 24. The other end of the second drain valve 23 is connected to the external recycling equipment through a pipe. The other end of the third drain valve 24 is connected to the external sewage treatment equipment through a pipe. One end of the central positioning column 8 is fixedly connected to the inlet valve 25 and the fourth drain valve 27 through a three-way pipe. The other end of the inlet valve 25 is connected to the external delivery pump through a pipe. The other end of the fourth drain valve 27 is connected to the external suction pump through a pipe. The top cover 4 is fixedly connected to the inlet valve 26. The other end of the inlet valve 26 is connected to the external delivery pump through a pipe.

[0031] It should be noted that this utility model is a mother liquor filtration and recovery device for polyacrylamide production. When filtering the mother liquor, the inlet valve 26 is opened and the external delivery pump continuously delivers the polyacrylamide production mother liquor. The mother liquor enters the initial filter frame 10 through the inlet channel 21 in the upper support plate 6. It first completes the preliminary filtration through the filter screens on both sides of the initial filter frame 10. Then the mother liquor flows through each intermediate filter frame 12 in sequence and finally enters the end filter frame 11. During the entire flow process, the mother liquor is in full contact with the activated carbon in each filter frame. The activated carbon adsorbs unreacted monomers, small molecule by-products and colored impurities in the mother liquor through its porous structure. After the mother liquor is filtered and adsorbed, it enters the external recovery equipment from the drain pipe 3 through the first drain valve 22 and the second drain valve 23.

[0032] When the activated carbon adsorption capacity decreases and the filtration effect deteriorates, the inlet valve 26, the second drain valve 23, and the third drain valve 24 are closed, and the inlet valve 25 is opened. The regeneration agent is transported through the hollow cavity of the central positioning column 8 and impacts the activated carbon filling areas of each initial filter frame 10, intermediate filter frame 12, and final filter frame 11 through the backflow channel 17 of the second positioning baffle 9. This ensures that the agent and activated carbon are in full contact, and the agent reacts with the unreacted monomers, small molecule byproducts, and other impurities adsorbed by the activated carbon, disrupting the adsorption force between the impurities and the activated carbon, allowing the impurities to escape from the activated carbon. Desorption occurs in the porous structure of activated carbon, restoring its porous adsorption performance. Then, the inlet valve 25 is closed, and the fourth drain valve 27 is opened. An external suction pump extracts the reagent containing impurities from the initial filter frame 10, the end filter frame 11, the intermediate filter frame 12, and the space between the initial filter frame 10, the end filter frame 11, and the intermediate filter frame 12 through the central positioning column 8 and the backwash channel 17. Finally, the fourth drain valve 27 is closed, and the first drain valve 22 and the third drain valve 24 are opened to discharge the remaining reagent deposited in the filter tank 1.

[0033] When replacing activated carbon, simply open the top cover 4 and remove the upper support plate 6. Then, the initial filter frame 10, the end filter frame 11, and the middle filter frame 12 can be lifted out in sequence to replace the activated carbon.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A mother liquor filtration and recovery device for polyacrylamide production, characterized in that: The system includes a filter tank (1), a base (2) fixedly connected to the lower end of the filter tank (1), a drain pipe (3) fixedly connected to the lower end of the filter tank (1) and located inside the base (2), a top cover (4) fixedly connected to the top of the filter tank (1), an upper support plate (6) fixedly connected between the filter tank (1) and the top cover (4), a plurality of first positioning partitions (7) fixedly connected circumferentially inside the filter tank (1), a lower support plate (5) fixedly connected inside the filter tank (1), a central positioning column (8) fixedly connected to the middle of the lower support plate (5), and a central positioning column (8) fixedly connected to the outer side of the central positioning column (8). Multiple second positioning partitions (9) are fixedly connected. An initial filter frame (10) and an end filter frame (11) are interspersed in the filter tank (1). Multiple intermediate filter frames (12) are also interspersed in the filter tank (1) between the initial filter frame (10) and the end filter frame (11). One side of the initial filter frame (10), the end filter frame (11), and the intermediate filter frame (12) is limited by two corresponding first positioning partitions (7). One side of the end filter frame (11) and the intermediate filter frame (12) is limited by two corresponding first positioning partitions (7), and the other side is limited by two corresponding second positioning partitions (9).

2. The mother liquor filtration and recovery device for polyacrylamide production according to claim 1, characterized in that: A level gauge (14) is fixedly connected to the outside of the filter tank (1).

3. The mother liquor filtration and recovery device for polyacrylamide production according to claim 1, characterized in that: A fixing ring (15) is fixedly connected inside the top cover (4), and the lower end face of the fixing ring (15) abuts against the upper support plate (6).

4. The mother liquor filtration and recovery device for polyacrylamide production according to claim 1, characterized in that: The lower support plate (5) has a first drainage channel (16).

5. The mother liquor filtration and recovery device for polyacrylamide production according to claim 4, characterized in that: The upper support plate (6) has a liquid inlet channel (21).

6. The mother liquor filtration and recovery device for polyacrylamide production according to claim 1, characterized in that: The central positioning column (8) has a hollow cavity inside. The central positioning column (8) has an L-shaped structure and one end extends to the outside of the filter tank (1). The second positioning partition (9) has multiple backflow channels (17) inside. The backflow channels (17) are connected to the cavity inside the central positioning column (8).

7. The mother liquor filtration and recovery device for polyacrylamide production according to claim 5, characterized in that: The initial filter frame (10) is fixedly connected to a first sealing plate (18) on one side relative to the end filter frame (11), and the end filter frame (11) is fixedly connected to a second sealing plate (19) on one side relative to the initial filter frame (10). The end filter frame (11) has a second drain channel (20) at its lower end and is fixedly connected to a filter screen. The upper end of the initial filter frame (10) is connected to the cavity of the inlet channel (21), and the second drain channel (20) is connected to the cavity of the first drain channel (16). Filter screens are fixedly connected to both sides of the initial filter frame (10) and one side of the end filter frame (11) and the middle filter frame (12). Activated carbon is filled in the initial filter frame (10), the end filter frame (11), and the middle filter frame (12).

8. The mother liquor filtration and recovery device for polyacrylamide production according to claim 1, characterized in that: The lower end of the drain pipe (3) is fixedly connected to a first drain valve (22). One end of the first drain valve (22) is fixedly connected to a second drain valve (23) and a third drain valve (24) through a three-way pipe. The other end of the second drain valve (23) is connected to an external recycling device through a pipe. The other end of the third drain valve (24) is connected to an external sewage treatment device through a pipe. One end of the central positioning column (8) is fixedly connected to an inlet valve (25) and a fourth drain valve (27) through a three-way pipe. The other end of the inlet valve (25) is connected to an external delivery pump through a pipe. The other end of the fourth drain valve (27) is connected to an external suction pump through a pipe. The top cover (4) is fixedly connected to an inlet valve (26). The other end of the inlet valve (26) is connected to an external delivery pump through a pipe.

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