Wastewater treatment device for anhydrous acetonitrile production

Abstract

The utility model discloses a wastewater treatment device for anhydrous acetonitrile production, which comprises a mixing tank and a sedimentation tank which are communicated through a suction pump. A feeding hole is formed in one side of the top of the mixing tank, a flow guide plate is fixed on one side of the inner wall of the feeding hole, a wastewater input pipe and a medicament input pipe are arranged on the flow guide plate, and flow dividing bulges are also arranged on the inner wall of the flow guide plate; a bearing plate is arranged on the inner bottom wall of the sedimentation tank, positioning plates are fixed to the two sides of the bearing plate, and an electric heating rod is further arranged in an inner cavity of the bottom of the sedimentation tank. And the two treatment modes of mixing and precipitation are carried out separately and do not interfere with each other, so that the effect is better.

Description

Technical Field

[0001] This utility model relates to the field of anhydrous acetonitrile production technology, specifically to a wastewater treatment device for anhydrous acetonitrile production. Background Technology

[0002] Anhydrous acetonitrile production generates wastewater, which cannot be discharged directly and therefore requires some degree of treatment.

[0003] As mentioned in the Chinese patent application CN202322683128.X regarding an industrial wastewater treatment device for acetonitrile production: "The conventional chemical treatment method involves adding chemical agents, such as ferric chloride and aluminum chloride, to react with pollutants in the wastewater, causing them to precipitate or coagulate into solid particles, thereby purifying the wastewater." Through improvements, the following has been achieved: "The chemical agent solution added to the dosing hopper can be intermittently added at different depths in the wastewater. Simultaneously, the two rotating outer tubes can drive multiple stirring rods to rotate in reciprocating motion, thus widening the stirring range and significantly reducing the reaction time between the wastewater and the chemical agent solution, effectively improving the treatment efficiency of industrial wastewater for acetonitrile production."

[0004] Through a search of the aforementioned patents and our simulated use, we found that this technology still has certain shortcomings in practical application:

[0005] After adding chemical agents to the treatment tank, the agents react with pollutants in the wastewater, causing them to precipitate or agglomerate into solid particles. Some of these solid particles settle on the inner bottom wall of the treatment tank. After the wastewater treatment is completed, the wastewater and sediment in the tank need to be discharged through a drain pipe. If the wastewater is discharged directly, a solid-liquid separation device needs to be added to separate the liquid and solid in the wastewater, which increases the cost. However, if the wastewater is discharged directly without a solid-liquid separation device, the impact force generated by the flow of wastewater may cause the previously formed flocs to break apart, thus mixing with the wastewater again and causing secondary pollution, ultimately resulting in incomplete treatment.

[0006] Therefore, in response to the technical problems mentioned above, we have designed a wastewater treatment device for anhydrous acetonitrile production. Utility Model Content

[0007] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a wastewater treatment device for anhydrous acetonitrile production, comprising a mixing tank and a sedimentation tank, wherein the mixing tank and the sedimentation tank are connected by a suction pump; an inlet is provided on one side of the top of the mixing tank, and a guide plate is fixed on one side of the inner wall of the inlet; a wastewater input pipe and a reagent input pipe are provided on the guide plate, and a diversion protrusion is also provided on the inner wall of the guide plate; a support plate is provided on the inner bottom wall of the sedimentation tank, and positioning plates are fixed on both sides of the support plate; positioning grooves are provided on both sides of the inner wall of the sedimentation tank to facilitate the placement of the positioning plates; and an electric heating rod is also provided in the bottom cavity of the sedimentation tank.

[0009] As a further embodiment of this utility model: multiple diversion protrusions are fixed on the guide plate, and the multiple diversion protrusions are staggered. The bottom of the guide plate is placed in the feed inlet, and a filter screen is also placed in the inner cavity of the feed inlet.

[0010] As a further embodiment of this utility model: the wastewater input pipe and the reagent input pipe are respectively fixedly inserted into the guide plate, and the wastewater input pipe is located above the reagent input pipe. The bottom of the wastewater input pipe and the reagent input pipe are provided with liquid outlets at equal intervals, and the liquid outlets are directed towards the diversion protrusion.

[0011] As a further embodiment of this utility model: a servo motor is also installed at the top center of the mixing tank. The power output shaft of the servo motor extends movably through the mixing tank and is connected to a rotating rod. The bottom of the rotating rod is rotatably connected to the inner bottom wall of the mixing tank, and a stirring blade is fixed on the rod body of the rotating rod.

[0012] As a further embodiment of this utility model: the top of the sedimentation tank is fitted with a cover, the top of the cover is connected to an exhaust pipe on which a solenoid valve is installed, and the inner cavity of the sedimentation tank is connected to an outlet pipe on which a valve is installed.

[0013] As a further embodiment of this utility model: multiple electric heating rods are provided in the bottom inner cavity of the sedimentation tank and are connected to the mains power through wires.

[0014] As a further embodiment of this utility model: the suction pump is installed between the mixing tank and the sedimentation tank by a support frame, the inlet of the suction pump is connected to a liquid suction pipe, the end of the liquid suction pipe away from the suction pump is fixedly inserted into the interior of the mixing tank and connected to a delivery pipe, the bottom of the delivery pipe is close to the inner bottom wall of the mixing tank, and the inner bottom wall of the mixing tank is designed as a sloping structure with the sloping direction facing the delivery pipe.

[0015] As a further embodiment of this utility model: the output port of the suction pump is connected to a drain pipe, and the end of the drain pipe away from the suction pump is fixedly connected to the interior of the sedimentation tank, and the outlet of the drain pipe is at the same horizontal line as the inner wall of the sedimentation tank.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] I. In this application, the designed mixing tank and sedimentation tank allow for the initial mixing of wastewater and reagents in the mixing tank, followed by reaction in the sedimentation tank. This causes pollutants in the wastewater to precipitate or agglomerate into solid particles. The mixing and sedimentation processes are carried out separately, without interference, resulting in better performance. This avoids continuous agitation that could damage the formed flocs. Furthermore, the sedimentation tank incorporates a support plate and electric heating rods. The sediment settles on the support plate, and after the water is discharged from the sedimentation tank, the electric heating rods can be used to dry the sediment. This allows for solid-liquid separation and sediment drying within the sedimentation tank, facilitating subsequent unified treatment, reducing production costs, and improving operational efficiency.

[0018] II. In this application, through the designed structure of guide plates, diversion protrusions, servo motors, and stirring blades, wastewater and chemicals can be introduced into the mixing tank through the guide plates. Under the action of the guide plates and diversion protrusions, the wastewater and chemicals can be continuously diverted and mixed, thus achieving initial mixing of wastewater and chemicals. After the wastewater and chemicals enter the mixing tank, the stirring blades can further agitate the chemicals and wastewater, improving the mixing effect. Once the wastewater and chemicals are fully mixed, a suction pump can be used to guide the liquid in the mixing tank into the sedimentation tank, allowing the wastewater and chemicals to react fully in the sedimentation tank without being affected by agitation, thus enabling pollutants to settle or coagulate into solid particles more effectively. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the mixing tank of this utility model;

[0021] Figure 3 This is a cross-sectional view of the wastewater inlet pipe of this utility model.

[0022] Figure 4 This is a side sectional view of the mixing tank of this utility model;

[0023] Figure 5 This is a cross-sectional view of the sedimentation tank of this utility model.

[0024] Figure 6 This is a schematic diagram showing the half-section position of the support plate of this utility model on the sedimentation tank;

[0025] Figure 7 This is a three-dimensional structural diagram of the support plate of this utility model.

[0026] The reference numerals and names in the figure are as follows:

[0027] 1. Mixing tank; 2. Sedimentation tank; 201. Cover; 202. Outlet pipe; 3. Suction pump; 301. Liquid extraction pipe; 3011. Conveying pipe; 302. Drain pipe; 4. Feed inlet; 401. Filter screen; 5. Guide plate; 6. Servo motor; 601. Rotating rod; 602. Stirring blade; 7. Exhaust pipe; 8. Diversion protrusion; 9. Wastewater input pipe; 10. Chemical input pipe; 11. Liquid outlet; 12. Support plate; 1201. Positioning plate; 13. Electric heating rod; 14. Positioning groove. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-7 A wastewater treatment device for anhydrous acetonitrile production includes a mixing tank 1 and a sedimentation tank 2, which are connected by a suction pump 3. An inlet 4 is provided on one side of the top of the mixing tank 1, and a guide plate 5 is fixed to one side of the inner wall of the inlet 4. A wastewater inlet pipe 9 and a reagent inlet pipe 10 are provided on the guide plate 5, and a diversion protrusion 8 is also provided on the inner wall of the guide plate 5. A support plate 12 is provided on the inner bottom wall of the sedimentation tank 2, and positioning plates 1201 are fixed on both sides of the support plate 12. Positioning slots 14 are provided on both sides of the inner wall of the sedimentation tank 2 to facilitate the insertion of the positioning plate 1201. The positioning plate 1201 can be inserted into the positioning slot 14 to ensure the accurate position of the bearing plate 12 and facilitate the removal of the bearing plate 12 from the sedimentation tank 2 through the positioning plate 1201. An electric heating rod 13 is also provided in the bottom inner cavity of the sedimentation tank 2. Multiple electric heating rods 13 are provided in the bottom inner cavity of the sedimentation tank 2 and are connected to the mains power through wires. The thickness of the bearing plate 12 is controlled at 2-3 mm.

[0030] Please see Figure 1 and Figure 2In this embodiment, multiple diversion protrusions 8 are fixed on the guide plate 5, and the multiple diversion protrusions 8 are staggered. The bottom of the guide plate 5 is placed in the feed inlet 4, and a filter screen 401 is also placed in the inner cavity of the feed inlet 4.

[0031] Specifically, the diversion protrusion 8 can continuously disperse the wastewater and the agent, so that the wastewater and the agent can be better mixed initially. A removable filter screen 401 is provided in the feed inlet 4. The filter screen 401 can be used to filter large particles in the wastewater, and the filter screen 401 can be removed and cleaned later.

[0032] Please see Figure 2 and Figure 3 In this embodiment, the wastewater input pipe 9 and the medicine input pipe 10 are respectively fixedly inserted into the guide plate 5, and the wastewater input pipe 9 is located above the medicine input pipe 10. The bottom of the wastewater input pipe 9 and the medicine input pipe 10 are provided with liquid outlets 11 at equal intervals, and the liquid outlets 11 are directed towards the diversion protrusion 8.

[0033] Specifically, wastewater flows through the guide plate 5 via the wastewater inlet pipe 9, while the reagent flows through the reagent inlet pipe 10 and merges with the wastewater on the guide plate 5. After merging, the two are continuously separated by the blocking effect of the diversion protrusion 8, achieving a preliminary mixing effect. Both the wastewater inlet pipe 9 and the reagent inlet pipe 10 have outlets 11 at equal intervals at their bottoms, which can ensure that the wastewater and reagent fall evenly onto the guide plate 5. At the same time, the wastewater inlet pipe 9 is connected to the wastewater conveying equipment (not shown) through a pipe, and a flow valve can be installed on the connecting pipe to control the input speed of the wastewater. The reagent inlet pipe 10 is connected to the reagent conveying equipment (not shown) through a pipe, and a flow valve can be installed on the connecting pipe to control the input speed of the reagent.

[0034] Please see Figure 1 and Figure 2 In this embodiment, a servo motor 6 is also installed at the top center of the mixing tank 1. The power output shaft of the servo motor 6 extends through the mixing tank 1 and is connected to a rotating rod 601. The bottom of the rotating rod 601 is rotatably connected to the inner bottom wall of the mixing tank 1, and a stirring blade 602 is fixed on the rod of the rotating rod 601.

[0035] Specifically, the power output shaft of the servo motor 6 drives the rotating rod 601 to rotate, and the rotation of the rotating rod 601 drives the stirring blade 602 to rotate and fully agitate the liquid in the mixing tank 1, so that the wastewater and the reagent are fully mixed, which is conducive to subsequent sedimentation.

[0036] Please see Figure 1 and Figure 5In this embodiment, the top of the sedimentation tank 2 is fitted with a cover 201, and the top of the cover 201 is connected to an exhaust pipe 7 on which a solenoid valve is installed. On one side of the inner cavity of the sedimentation tank 2 and at the top of the support plate 12, there is an outlet pipe 202 on which a valve is installed.

[0037] Specifically, the cover 201 can seal the sedimentation tank 2 to a certain extent, preventing the odor generated when the liquid in the sedimentation tank 2 reacts from affecting the surrounding staff. The exhaust pipe 7 installed on the cover 201 is conducive to the discharge of waste gas. The exhaust pipe 7 can be connected to the waste gas treatment equipment (not shown). The position of the outlet pipe 202 is higher than the support plate 12. The area below the outlet pipe 202 can form a sedimentation area. When the outlet pipe 202 discharges the purified water, it will not affect the sediment on the support plate 12.

[0038] Please see Figure 1 , Figure 4 and Figure 6 In this embodiment, the suction pump 3 is installed between the mixing tank 1 and the sedimentation tank 2 via a support frame. The inlet of the suction pump 3 is connected to the suction pipe 301. The end of the suction pipe 301 away from the suction pump 3 is fixedly inserted into the interior of the mixing tank 1 and connected to the delivery pipe 3011. The bottom of the delivery pipe 3011 is close to the inner bottom wall of the mixing tank 1. The inner bottom wall of the mixing tank 1 is designed as a sloping structure, and the sloping direction is towards the delivery pipe 3011. The outlet of the suction pump 3 is connected to the drain pipe 302. The end of the drain pipe 302 away from the suction pump 3 is fixedly connected to the interior of the sedimentation tank 2, and the outlet of the drain pipe 302 is at the same horizontal line as the inner wall of the sedimentation tank 2.

[0039] Specifically, the suction pump 3 is used to transfer the wastewater-chemical mixture in the mixing tank 1 to the sedimentation tank 2. The bottom of the conveying pipe 3011 is close to the inner bottom wall of the mixing tank 1. The inner bottom wall of the mixing tank 1 is designed with a sloping structure, which makes it easy for the conveying pipe 3011 to extract the mixed water from the mixing tank 1. Moreover, the outlet of the drain pipe 302 is at the same level as the inner wall of the sedimentation tank 2, which can avoid obstructing the removal and placement of the support plate 12.

[0040] During use, wastewater is introduced through wastewater inlet pipe 9 and chemicals are introduced through chemical inlet pipe 10. The wastewater and chemicals fall onto the guide plate 5 respectively. Under the action of the diversion protrusion 8, the wastewater and chemicals continuously change their paths and undergo preliminary mixing. After passing through the guide plate 5 and being guided by the filter screen 401 to filter out large particles, they enter the mixing tank 1 until the mixing tank 1 is full. Then, the wastewater inlet pipe 9 and the chemical inlet pipe 10 are disconnected from the wastewater and chemical input.

[0041] The servo motor 6 is started to drive the stirring blade 602 to stir the wastewater and reagent in the mixing tank 1, so that they are further fully mixed. After stirring for a certain period of time, the suction pump 3 is started. The suction pump 3 uses the delivery pipe 3011 and the liquid extraction pipe 301 to transport the wastewater and reagent mixture to the discharge pipe 302, and then to the sedimentation tank 2 through the discharge pipe 302. After the liquid in the mixing tank 1 is completely extracted, the suction pump 3 is turned off. The sedimentation tank 2 is filled with wastewater and reagent mixture. At this time, since the sedimentation tank 2 is in a static state, the wastewater and reagent mixture can fully react in the sedimentation tank 2, forming precipitates or agglomerating into solid particles that settle on the support plate 12. After the liquid reaction in the sedimentation tank 2 is completed, the purified water can be discharged through the outlet pipe 202, while other substances settle on the support plate 12.

[0042] After the purified water in sedimentation tank 2 is discharged, only the sediment on the support plate 12 remains in sedimentation tank 2. Then, the electric heating rod 13 can be activated to dry the sediment on the support plate 12. The exhaust gas generated during the drying process is discharged through the exhaust pipe 7. After the sediment on the support plate 12 is dried, the cover 201 can be opened, and the support plate 12 can be pulled upward using the two positioning plates 1201. The support plate 12 carries out the sediment and dries the sediment on it. Then, the dried sediment can be scraped off the support plate 12 and processed uniformly. After cleaning the support plate 12, it can be put back into sedimentation tank 2 for convenient subsequent use.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A wastewater treatment device for anhydrous acetonitrile production, characterized in that, It includes a mixing tank (1) and a sedimentation tank (2), which are connected by a suction pump (3); The mixing tank (1) has an inlet (4) on one side of the top. A guide plate (5) is fixed on one side of the inner wall of the inlet (4). A wastewater input pipe (9) and a reagent input pipe (10) are provided on the guide plate (5). A diversion protrusion (8) is also provided on the inner wall of the guide plate (5). The sedimentation tank (2) has a support plate (12) on its inner bottom wall. Positioning plates (1201) are fixed on both sides of the support plate (12). Positioning grooves (14) are opened on both sides of the inner wall of the sedimentation tank (2) to facilitate the placement of the positioning plates (1201). An electric heating rod (13) is also provided in the bottom cavity of the sedimentation tank (2).

2. The wastewater treatment device for anhydrous acetonitrile production according to claim 1, characterized in that, Multiple diversion protrusions (8) are fixed on the guide plate (5), and the multiple diversion protrusions (8) are staggered. The bottom of the guide plate (5) is placed in the feed inlet (4), and a filter screen (401) is also placed in the inner cavity of the feed inlet (4).

3. The wastewater treatment device for anhydrous acetonitrile production according to claim 1, characterized in that, The wastewater inlet pipe (9) and the medicine inlet pipe (10) are respectively fixedly inserted into the guide plate (5), and the wastewater inlet pipe (9) is located above the medicine inlet pipe (10). The bottom of the wastewater inlet pipe (9) and the medicine inlet pipe (10) are provided with liquid outlets (11) at equal intervals, and the liquid outlets (11) are directed toward the diversion protrusion (8).

4. The wastewater treatment device for anhydrous acetonitrile production according to claim 1, characterized in that, A servo motor (6) is installed at the top center of the mixing tank (1). The power output shaft of the servo motor (6) extends through the mixing tank (1) and is connected to a rotating rod (601). The bottom of the rotating rod (601) is rotatably connected to the inner bottom wall of the mixing tank (1). A stirring blade (602) is fixed on the rod of the rotating rod (601).

5. The wastewater treatment device for anhydrous acetonitrile production according to claim 1, characterized in that, The top of the sedimentation tank (2) is fitted with a cover (201), and the top of the cover (201) is connected to an exhaust pipe (7) on which a solenoid valve is installed. The sedimentation tank (2) is connected to an outlet pipe (202) on which a valve is installed on the pipe at one side of the inner cavity and at the top of the support plate (12).

6. The wastewater treatment device for anhydrous acetonitrile production according to claim 1, characterized in that, Multiple electric heating rods (13) are installed in the bottom cavity of the sedimentation tank (2) and are connected to the mains power through wires.

7. The wastewater treatment device for anhydrous acetonitrile production according to claim 1, characterized in that, The suction pump (3) is installed between the mixing tank (1) and the sedimentation tank (2) via a support frame. The inlet of the suction pump (3) is connected to a liquid extraction pipe (301). The end of the liquid extraction pipe (301) away from the suction pump (3) is fixedly inserted into the interior of the mixing tank (1) and connected to a delivery pipe (3011). The bottom of the delivery pipe (3011) is close to the inner bottom wall of the mixing tank (1). The inner bottom wall of the mixing tank (1) is designed as a sloping structure, and the sloping direction is towards the delivery pipe (3011).

8. The wastewater treatment device for anhydrous acetonitrile production according to claim 7, characterized in that, The output port of the suction pump (3) is connected to a drain pipe (302). The end of the drain pipe (302) away from the suction pump (3) is fixedly connected to the interior of the sedimentation tank (2), and the outlet of the drain pipe (302) is at the same horizontal line as the inner wall of the sedimentation tank (2).

Images