A device for separating and recovering polyvinyl alcohol in dimethylformamide wastewater

Abstract

The utility model discloses a kind of polyvinyl alcohol separation and recovery devices in dimethylformamide wastewater, belong to polyvinyl alcohol recovery device technical field, the bottom of reaction box is fixedly connected with liquid storage tank, the side surface of liquid storage tank is fixedly communicated with conveying pump, the liquid outlet end of conveying pump is fixedly communicated with reflux pipe, the surface of reaction box is fixedly communicated with liquid inlet nozzle and liquid outlet nozzle, the outside of reaction box is fixedly installed with polyvinyl alcohol separator, the polyvinyl alcohol separation and recovery device in this dimethylformamide wastewater, by being set filter cover, carousel, top plate, scraper and blow-off nozzle, impurity in sewage can be filtered in sewage adding process, not only polyvinyl alcohol separator feeding end can be avoided blockage, simultaneously, filtered impurity can be automatically discharged, and by being set stirring drum, connecting pipe, dosing pipe and outlet pipe, salt-out agent can be evenly added in sewage inside in stirring process, improve the mixing efficiency of chemical solution.

Description

Technical Field

[0001] This utility model relates to the technical field of polyvinyl alcohol recovery devices, and more specifically, to a polyvinyl alcohol separation and recovery device for dimethylformamide wastewater. Background Technology

[0002] Dimethylformamide (DMF) wastewater is characterized by high pollution, toxicity, complexity, and stability, making it difficult to treat. It requires a combination of multiple processes to achieve compliant discharge and resource recovery.

[0003] Currently, polyvinyl alcohol (PVA) recovery from wastewater requires the use of PVA separation and recovery devices. However, commonly used PVA separation and recovery devices are prone to clogging by impurities in the wastewater during use, and the reagent mixing efficiency is low, reducing work efficiency. For example, CN210012677U discloses a wastewater PVA recycling and recovery device, which includes a reaction tank, a PVA separator, a separation liquid buffer tank, and a separation liquid circulation system. The reaction tank has a conical structure, with a wastewater inlet and a salting-out agent dosing port at the top. The bottom of the reaction tank is connected to the PVA separator through a liquid delivery pipeline, and a solenoid valve is installed on the liquid delivery pipeline.

[0004] As can be seen from the above-disclosed scheme, when the polyvinyl alcohol recycling device separates and recycles polyvinyl alcohol, the impurities contained in the wastewater inside the reaction tank will cause blockage at the feed end of the polyvinyl alcohol separator, thus affecting the operation. At the same time, when adding salting-out agent through the salting-out agent dosing port, the agent can only be added to the surface of the wastewater, and it takes a long time to mix it evenly, which reduces the mixing efficiency. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a polyvinyl alcohol separation and recovery device for dimethylformamide wastewater. This device, through the installation of a filter cover, turntable, top plate, scraper, and drain nozzle, can filter impurities in the wastewater during the wastewater addition process. This not only avoids clogging at the feed end of the polyvinyl alcohol separator, but also allows the filtered impurities to be automatically discharged. Furthermore, through the installation of a stirring drum, connecting pipe, dosing pipe, and discharging pipe, the salting-out agent can be evenly added into the wastewater during the stirring process, improving the mixing efficiency of the solution.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A polyvinyl alcohol separation and recovery device for dimethylformamide wastewater includes a reaction tank. A storage tank is fixedly connected to the bottom of the reaction tank. A transfer pump is fixedly connected to the side of the storage tank, and a return pipe is fixedly connected to the outlet of the transfer pump. A filling nozzle and a discharging nozzle are fixedly connected to the surface of the reaction tank. A polyvinyl alcohol separator is fixedly installed on the outside of the reaction tank. A discharge nozzle and a drain pipe are provided on the surface of the polyvinyl alcohol separator. One end of the drain pipe is connected to the interior of the storage tank. A filtration mechanism is rotatably connected to the inner wall of the reaction tank. The surface of the structure is fixedly connected to a mixing mechanism, and the surface of the filtration mechanism is slidably connected to a sewage discharge component. This polyvinyl alcohol separation and recovery device in dimethylformamide wastewater, through the set filter cover, turntable, top plate, scraper and sewage discharge nozzle, can filter impurities in the wastewater during the wastewater addition process. It can not only avoid clogging at the feed end of the polyvinyl alcohol separator, but also automatically discharge the filtered impurities. Furthermore, through the set stirring drum, connecting pipe, dosing pipe and discharge pipe, the salting-out agent can be evenly added into the wastewater during the stirring process, improving the mixing efficiency of the solution.

[0008] Furthermore, the mixing mechanism includes a motor, which is fixedly installed at the bottom of the storage tank. A rotating shaft is fixedly connected to the output end of the motor. A first sealed bearing is fixedly installed on the surface of the rotating shaft. A stirring cylinder is fixedly connected to one end of the rotating shaft. A stirring blade is fixedly connected to the side of the stirring cylinder. The rotating shaft is rotatably connected to the storage tank through the first sealed bearing, which can seal the connection. Moreover, the stirring cylinder can prevent the medicine from entering the storage tank.

[0009] Furthermore, the filtration mechanism includes a filter cover, a top plate is fixedly connected to the top of the filter cover, a turntable is fixedly sleeved on the bottom of the filter cover, the surface of the turntable has perforations, and the filter cover is funnel-shaped, which can filter impurities in the added wastewater.

[0010] Furthermore, the sewage discharge assembly includes a sewage discharge nozzle, one end of which is provided with an extension and a scraper. The side of the extension is fixedly connected to the surface of the reaction chamber, and the bottom of the scraper is slidably connected to the surface of the turntable. The scraper can guide impurities intercepted on the surface of the turntable into the sewage discharge nozzle for discharge.

[0011] Furthermore, one end of the stirring drum has an installation groove, the bottom of the installation groove is fixedly connected to a connecting pipe, one end of the connecting pipe has a connecting hole, and the side of the connecting hole is fixedly connected to a dispensing pipe. The dispensing pipes are distributed in a ring at equal intervals, which can evenly add the salting-out agent into the wastewater.

[0012] Furthermore, a second sealing bearing is fixedly connected to the surface of the connecting pipe, and a rotating sleeve is rotatably connected to one end of the connecting pipe. A dosing pipe is fixedly sleeved on the surface of the rotating sleeve. The rotating sleeve is a sealing bearing, which can seal the connection and prevent the dosing pipe from rotating.

[0013] Furthermore, a one-way valve is installed on the surface of the connecting pipe, which can prevent sewage from entering the dosing pipe upward through the outlet pipe.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] This solution, through the installation of a filter cover, turntable, top plate, scraper, and drain nozzle, can filter impurities in wastewater during the wastewater addition process. This not only prevents clogging at the feed end of the polyvinyl alcohol separator, but also allows the filtered impurities to be automatically discharged.

[0016] This solution, through the installation of a mixing drum, connecting pipe, dosing pipe, and discharging pipe, allows the salting-out agent to be evenly added into the wastewater during the mixing process, thus improving the mixing efficiency of the solution. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the mixing mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the filter mechanism structure of this utility model;

[0020] Figure 4 for Figure 2 A cross-sectional view of the installation structure of the mixing tank and connecting pipes;

[0021] Figure 5 This is a schematic diagram of the drain nozzle structure of this utility model.

[0022] Explanation of the labels in the diagram:

[0023] 1. Reaction chamber; 11. Injector nozzle; 12. Transfer pump; 13. Return pipe; 14. Outlet nozzle; 15. Polyvinyl alcohol separator; 16. Discharge nozzle; 17. Drain pipe; 18. Storage tank; 2. Drain nozzle; 21. Extension section; 22. Scraper; 3. Mixing mechanism; 31. Motor; 32. Rotating shaft; 33. First sealed bearing; 34. Stirring drum; 35. Mounting groove; 36. Stirring blade; 4. Connecting pipe; 41. Connecting hole; 42. Check valve; 43. Discharge pipe; 44. Second sealed bearing; 45. Rotating sleeve; 46. Injection pipe; 5. Filtration mechanism; 51. Filter cover; 52. Turntable; 53. Leakage hole; 54. Top plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0025] Please see Figure 1-5 A polyvinyl alcohol separation and recovery device for dimethylformamide wastewater includes a reaction tank 1. A storage tank 18 is fixedly connected to the bottom of the reaction tank 1. A transfer pump 12 is fixedly connected to the side of the storage tank 18. The transfer pump 12 is equipped with a suction pipe, which can draw out the separated liquid from the storage tank 18 and then transport it into the reaction tank 1. This is prior art. A return pipe 13 is fixedly connected to the outlet end of the transfer pump 12. A filling nozzle 11 and a discharging nozzle 14 are fixedly connected to the surface of the reaction tank 1. Both the filling nozzle 11 and the discharging nozzle 14 are equipped with sealing caps. The nozzle 11 is used to add wastewater, and the outlet nozzle 14 is used to discharge the separated liquid in the storage tank 18. A polyvinyl alcohol separator 15 is fixedly installed on the outside of the reaction tank 1. The polyvinyl alcohol separator 15 is a solid-liquid separator of model FZ-12, used to separate polyvinyl alcohol from wastewater. The inlet end of the polyvinyl alcohol separator 15 is connected to the inside of the reaction tank 1. The surface of the polyvinyl alcohol separator 15 is provided with an outlet nozzle 16 and a drain pipe 17. The outlet nozzle 16 is used to discharge the separated polyvinyl alcohol, and one end of the drain pipe 17 is connected to the inside of the storage tank 18. The parts are connected, and the drain pipe 17 is used to discharge the separated liquid into the storage tank 18. The inner wall of the reaction tank 1 is rotatably connected to the filter mechanism 5, which includes a filter cover 51. The top of the filter cover 51 is fixedly connected to a top plate 54, and the bottom of the filter cover 51 is fixedly fitted with a turntable 52. The surface of the turntable 52 has a leakage hole 53 to prevent the interception of sewage. The filter cover 51 is funnel-shaped to filter impurities in the added sewage. The surface of the filter mechanism 5 is fixedly connected to a mixing mechanism 3, which includes a motor. 31. The motor 31 is fixedly installed at the bottom of the liquid storage tank 18. The output end of the motor 31 is fixedly connected to the rotating shaft 32. The surface of the rotating shaft 32 is fixedly installed with the first sealing bearing 33. One end of the rotating shaft 32 is fixedly connected to the stirring cylinder 34. The side of the stirring cylinder 34 is fixedly connected with the stirring blade 36. The rotating shaft 32 is rotatably connected to the liquid storage tank 18 through the first sealing bearing 33, which can seal the connection. Moreover, the stirring cylinder 34 can prevent the medicine from entering the liquid storage tank 18. The surface of the filter mechanism 5 is slidably connected with the sewage discharge component.

[0026] The sewage discharge assembly includes a sewage discharge nozzle 2. One end of the sewage discharge nozzle 2 is provided with an extension 21 and a scraper 22. The side of the extension 21 is fixedly connected to the surface of the reaction chamber 1. The bottom of the scraper 22 is slidably connected to the surface of the turntable 52. The scraper 22 can guide the impurities intercepted on the surface of the turntable 52 into the sewage discharge nozzle 2 for discharge. One end of the stirring drum 34 has an installation groove 35. The bottom of the installation groove 35 is fixedly connected to a connecting pipe 4. One end of the connecting pipe 4 has a connecting hole 41. The side of the connecting hole 41 is fixedly connected to a drug outlet pipe 43. The drug outlet pipes 43 are distributed in a ring at equal intervals, which can evenly add the salting-out agent into the sewage.

[0027] A second sealing bearing 44 is fixedly connected to the surface of the connecting pipe 4. A rotating sleeve 45 is rotatably connected to one end of the connecting pipe 4. A dosing pipe 46 is fixedly sleeved on the surface of the rotating sleeve 45. One end of the dosing pipe 46 is connected to a liquid salting agent storage container and is equipped with a booster pump to ensure smooth dosing of the liquid salting agent. The rotating sleeve 45 is a sealing bearing, which can seal the connection and prevent the dosing pipe 46 from rotating. A one-way valve 42 is installed on the surface of the connecting pipe 4. The one-way valve 42 can prevent sewage from entering the dosing pipe 46 upward through the outlet pipe 43.

[0028] When using the polyvinyl alcohol separation and recovery device for dimethylformamide wastewater, the motor 31 is first started, causing the rotating shaft 32 to drive the stirring drum 34 and connecting pipe 4 to rotate. The rotation of the stirring drum 34 and connecting pipe 4 drives the stirring blades 36 and filter cover 51 to rotate. Wastewater falls downwards through the liquid inlet 11 onto the surface of the filter cover 51. At the same time, impurities in the wastewater are intercepted by the filter cover 51. The rotation of the filter cover 51 drives the turntable 52 to rotate, and the impurities intercepted by the filter cover 51 fall onto the surface of the turntable 52. When the turntable 52 rotates to the scraper 22, the scraper 22 intercepts the impurities on the surface of the turntable 52 and guides them into the drain nozzle 2 for discharge. At this time, the filtered wastewater falls into the reaction tank 1. Then, liquid salting-out agent is added through the dosing pipe 46. The liquid salting-out agent enters the outlet pipe 43 through the connecting hole 41. Under the rotation of the stirring drum 34, the outlet pipe 43 rotates to discharge the agent, so that the liquid salting-out agent is evenly added into the wastewater, improving the mixing efficiency of the solution.

[0029] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A polyvinyl alcohol separation and recovery device for dimethylformamide wastewater, comprising a reaction tank (1), wherein a storage tank (18) is fixedly connected to the bottom of the reaction tank (1), a transfer pump (12) is fixedly connected to the side of the storage tank (18), a return pipe (13) is fixedly connected to the outlet end of the transfer pump (12), and a filling nozzle (11) and a discharging nozzle (14) are fixedly connected to the surface of the reaction tank (1), characterized in that: A polyvinyl alcohol separator (15) is fixedly installed on the outside of the reaction tank (1). The surface of the polyvinyl alcohol separator (15) is provided with a discharge nozzle (16) and a drain pipe (17). One end of the drain pipe (17) is connected to the inside of the storage tank (18). A filter mechanism (5) is rotatably connected to the inner wall of the reaction tank (1). A mixing mechanism (3) is fixedly connected to the surface of the filter mechanism (5). A sewage discharge component is slidably connected to the surface of the filter mechanism (5).

2. The polyvinyl alcohol separation and recovery device for dimethylformamide wastewater according to claim 1, characterized in that: The mixing mechanism (3) includes a motor (31), which is fixedly installed at the bottom of the liquid storage tank (18). The output end of the motor (31) is fixedly connected to a rotating shaft (32). A first sealed bearing (33) is fixedly installed on the surface of the rotating shaft (32). A stirring cylinder (34) is fixedly connected to one end of the rotating shaft (32). A stirring blade (36) is fixedly connected to the side of the stirring cylinder (34).

3. The polyvinyl alcohol separation and recovery device for dimethylformamide wastewater according to claim 1, characterized in that: The filtration mechanism (5) includes a filter cover (51), a top plate (54) is fixedly connected to the top of the filter cover (51), and a turntable (52) is fixedly sleeved on the bottom of the filter cover (51). The surface of the turntable (52) has a leakage hole (53).

4. The polyvinyl alcohol separation and recovery device for dimethylformamide wastewater according to claim 3, characterized in that: The sewage discharge assembly includes a sewage discharge nozzle (2), one end of which is provided with an extension (21) and a scraper (22). The side of the extension (21) is fixedly connected to the surface of the reaction chamber (1), and the bottom of the scraper (22) is slidably connected to the surface of the turntable (52).

5. The polyvinyl alcohol separation and recovery device for dimethylformamide wastewater according to claim 2, characterized in that: The stirring drum (34) has an installation groove (35) at one end, and a connecting pipe (4) is fixedly connected to the bottom of the installation groove (35). A connecting hole (41) is opened at one end of the connecting pipe (4), and a medicine outlet pipe (43) is fixedly connected to the side of the connecting hole (41).

6. The polyvinyl alcohol separation and recovery device for dimethylformamide wastewater according to claim 5, characterized in that: A second sealing bearing (44) is fixedly connected to the surface of the connecting pipe (4), and a rotating sleeve (45) is rotatably connected to one end of the connecting pipe (4). A dosing pipe (46) is fixedly sleeved on the surface of the rotating sleeve (45).

7. The polyvinyl alcohol separation and recovery device for dimethylformamide wastewater according to claim 5, characterized in that: A one-way valve (42) is installed on the surface of the connecting pipe (4).

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