Two-stage rectifying device for NMP waste liquid

Abstract

The utility model relates to waste liquid rectification device technical field, and disclose a kind of NMP waste liquid two-stage rectification device, including first rectification tower, the inside installation of first rectification tower has mixed component, the side of first rectification tower is provided with drainage component.This NMP waste liquid two-stage rectification device can drive transmission rod to rotate by motor drive, and transmission rod can make first pulley rotate when rotating, and the connection of belt makes second pulley synchronous rotation, and the transmission power effect is played in the component, when second pulley rotates, it can drive stirring frame and inlet to rotate, artificial extraction agent is placed by inlet, so that it flows into waste liquid by the hole of stirring frame, and the rotation of stirring frame can make it fully mixed, the setting of the component increases the mixing effect of extraction agent and waste liquid, improves rectification efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of waste liquid distillation devices, specifically a two-stage distillation device for NMP waste liquid. Background Technology

[0002] NMP is a highly polar organic solvent with good solubility and chemical stability, and is widely used in industries such as petrochemicals, electronics, and lithium batteries. For example, in lithium battery production, NMP is often used to dissolve the binder in the cathode material so that the cathode material can be uniformly coated on the current collector. In these production processes, waste liquid containing NMP is generated due to the volatilization, leakage, and product cleaning of NMP.

[0003] A two-stage distillation unit for NMP waste liquid utilizes the differences in boiling points or saturated vapor pressures of the components in a mixture of NMP, water, and other impurities. This causes the lighter components to vaporize, and through multiple partial liquid-phase vaporizations and partial gas-phase condensations, the concentrations of the lighter components in the gas phase and the heavier components in the liquid phase gradually increase, thus achieving separation. It is generally used to recycle NMP-containing waste liquid generated during lithium battery production, enabling the recycling of NMP, reducing production costs, and minimizing environmental pollution.

[0004] The prior art patent document CN220002998U provides an NMP waste liquid distillation and purification system. This NMP waste liquid distillation and purification system performs secondary separation of gaseous light components in the first distillation column by adding a membrane separation component. Small molecule gases, including water vapor and methylamine, are directly discharged without condensation and reflux, which improves the separation accuracy. At the same time, the light components can be discharged in a single distillation, eliminating the need for an intermediate distillation column.

[0005] While the aforementioned prior art NMP waste liquid distillation and purification system can perform secondary separation of gaseous light components in the first distillation column through the membrane separation component, thus eliminating the need for an intermediate distillation column and improving separation accuracy, the NMP waste liquid distillation and purification system in this patented technology requires mixing the extractant with the waste liquid to precipitate impurities before distillation and purification. However, the mixing effect of this device is not ideal, which affects the distillation and purification effect and reduces work efficiency. Therefore, we need a two-stage distillation device for NMP waste liquid. Utility Model Content

[0006] The purpose of this invention is to provide a two-stage distillation device for NMP waste liquid, which solves the problem in the NMP waste liquid distillation purification system proposed in the background art. In this system, the waste liquid needs to be mixed with an extractant to precipitate impurities before distillation purification can be carried out. However, the mixing effect of this device is not ideal, which affects the distillation purification effect and reduces work efficiency.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A two-stage distillation apparatus for NMP waste liquid includes a first distillation column, a base fixedly connected to the bottom of the first distillation column, a mixing component installed inside the first distillation column, and a drain component provided on one side of the first distillation column. The mixing component includes a motor, the output end of which is detachably connected to a transmission rod via a coupling, and the outer wall of the transmission rod is provided with a first pulley, the outer wall of the first pulley is rotatably connected to a belt, and the inner wall of the belt is provided with a second pulley, the inner wall of the second pulley is rotatably connected to a stirring frame, and the top of the stirring frame is provided with a liquid inlet, and the top of the liquid inlet is equipped with a cover plate. The drainage assembly includes a fixing ring, with a screw threaded to the inner wall of the fixing ring. A tube is fixedly connected to the inner wall of the fixing ring, and a rotating disk is provided at the top of the tube. A connecting rod is fixedly connected to the bottom of the rotating disk, and a ball valve is provided at the bottom of the connecting rod.

[0008] Preferably, the first distillation column is equipped with a conveying mechanism, and a second distillation column is installed on one side of the conveying mechanism.

[0009] Preferably, the motor forms a rotating structure with the first pulley via a transmission rod, and one end of the transmission rod passes through the first pulley. The first pulley forms a rotating structure with the second pulley via a belt.

[0010] Preferably, the belt is connected to the stirring frame via a second pulley to form a rotating structure, and one end of the stirring frame passes through the second pulley.

[0011] Preferably, the second pulley forms a rotating structure with the liquid inlet via the stirring frame, and the cover plate is located on top of the liquid inlet.

[0012] Preferably, the first distillation column is fixed by screws and fixing rings, and there are multiple screws. The first distillation column is fixed by fixing rings and tubes.

[0013] Preferably, the rotating disk is fixed to the ball valve via a connecting rod, and the connecting rod is installed between the rotating disk and the ball valve.

[0014] Compared with the prior art, the beneficial effects of this utility model are: this two-stage distillation device for NMP waste liquid, First, this utility model includes a motor, a transmission rod, a first pulley, a belt, a second pulley, a stirring frame, a liquid inlet, and a cover plate. The motor drives the transmission rod to rotate, which in turn causes the first pulley to rotate. The belt then connects to the second pulley, which rotates synchronously. The first pulley, belt, and second pulley form a pulley assembly, which transmits power. The rotation of the second pulley drives the stirring frame and the liquid inlet to rotate. The extractant is manually added through the liquid inlet and flows out through the holes in the stirring frame into the waste liquid. The rotation of the stirring frame ensures thorough mixing. This assembly enhances the mixing effect between the extractant and the waste liquid, improving distillation efficiency.

[0015] Secondly, this utility model includes a fixing ring, screws, a tube body, a rotating disc, a connecting rod, and a ball valve. By using the screw to pass through the fixing ring and tighten it with the second distillation column, the tube body can be fixedly installed, facilitating the discharge of the distilled waste liquid. By manually rotating the rotating disc, the connecting rod can be rotated, which in turn rotates the ball valve, thus controlling the opening and closing of the tube body. Moreover, the discharge volume can be adjusted according to the rotation amplitude. This component facilitates the discharge of waste liquid and is convenient for personnel to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the front sectional view of the present invention; Figure 3 This is a schematic diagram of the motor and stirring frame structure of this utility model; Figure 4 This is a schematic diagram of the pipe body and ball valve structure of this utility model.

[0017] In the diagram: 1. First distillation column; 2. Base; 3. Mixing assembly; 301. Motor; 302. Drive rod; 303. First pulley; 304. Belt; 305. Second pulley; 306. Stirring rack; 307. Liquid inlet; 308. Cover plate; 4. Conveying mechanism; 5. Second distillation column; 6. Drainage assembly; 601. Fixing ring; 602. Screw; 603. Pipe body; 604. Rotating disc; 605. Connecting rod; 606. Ball valve. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A two-stage distillation apparatus for NMP waste liquid includes a first distillation column 1, a base 2 fixedly connected to the bottom of the first distillation column 1, a mixing component 3 installed inside the first distillation column 1, and a drain component 6 provided on one side of the first distillation column 1. The mixing component 3 includes a motor 301. The output end of the motor 301 is detachably connected to a transmission rod 302 via a coupling. A first pulley 303 is provided on the outer wall of the transmission rod 302. A belt 304 is rotatably connected to the outer wall of the first pulley 303. A second pulley 305 is provided on the inner wall of the belt 304. A stirring frame 306 is rotatably connected to the inner wall of the second pulley 305. A liquid inlet 307 is provided on the top of the stirring frame 306. A cover plate 308 is installed on the top of the liquid inlet 307. The drainage assembly 6 includes a fixing ring 601, with a screw 602 threadedly connected to the inner wall of the fixing ring 601. A pipe body 603 is fixedly connected to the inner wall of the fixing ring 601, and a rotating disk 604 is provided at the top of the pipe body 603. A connecting rod 605 is fixedly connected to the bottom of the rotating disk 604, and a ball valve 606 is provided at the bottom of the connecting rod 605.

[0020] Through the above technical solution, the motor 301 drives the transmission rod 302 to rotate, and the rotation of the transmission rod 302 causes the first pulley 303 to rotate. The second pulley 305 rotates synchronously through the connection of the belt 304. The first pulley 303, the belt 304, and the second pulley 305 are combined to form a pulley group, which plays the role of transmitting power in this component. When the second pulley 305 rotates, it can drive the stirring rack 306 and the liquid inlet 307 to rotate. The extractant is manually put into the liquid inlet 307 and flows out into the waste liquid through the holes opened on the stirring rack 306. The rotation of the stirring rack 306 can make it fully mixed. The setting of this component increases the mixing effect of the extractant and the waste liquid and improves the distillation efficiency.

[0021] Specifically, the first distillation column 1 is equipped with a conveying mechanism 4, and a second distillation column 5 is installed on one side of the conveying mechanism 4.

[0022] Through the above technical solution, the conveying mechanism 4 consists of a water pump and a connecting pipe. The pumping energy of the water pump draws the waste liquid in the first distillation column 1 into the second distillation column 5, and the second distillation column 5 is equipped with a condenser, thereby performing secondary distillation on the waste liquid.

[0023] Specifically, the motor 301 forms a rotating structure with the first pulley 303 via the transmission rod 302, and one end of the transmission rod 302 passes through the first pulley 303. The first pulley 303 forms a rotating structure with the second pulley 305 via the belt 304.

[0024] Through the above technical solution, the transmission rod 302 can be driven to rotate by the motor 301. When the transmission rod 302 rotates, the first pulley 303 can rotate. Then, through the connection of the belt 304, the second pulley 305 can rotate synchronously. The first pulley 303, the belt 304 and the second pulley 305 are combined to form a pulley group, which plays the role of transmitting power in the component.

[0025] Specifically, the belt 304 forms a rotating structure with the stirring frame 306 via the second pulley 305, and one end of the stirring frame 306 is installed through the second pulley 305.

[0026] Through the above technical solution, the rotation of the second pulley 305 can drive the stirring frame 306 to rotate, which can play the role of stirring the waste liquid and the extractant, so that they can be mixed more thoroughly.

[0027] Specifically, the second pulley 305 forms a rotating structure with the inlet 307 via the stirring frame 306, and the cover plate 308 is located on top of the inlet 307.

[0028] With the above technical solution, the extractant is manually added from the inlet 307. After flowing into the stirring rack 306, it flows out through the holes opened on the stirring rack 306, thereby mixing with the waste liquid. Then, the stirring rack 306 makes the mixing more thorough.

[0029] Specifically, the first distillation column 1 is fixed by screws 602 and fixing rings 601, and there are multiple screws 602. The first distillation column 1 is fixed by fixing rings 601 and tube body 603.

[0030] By using the above technical solution, the screw 602 is rotated and tightened with the fixing ring 601, which can play a role in fixing the installation and thus firmly connecting the pipe body 603 to the drain port, facilitating the discharge of waste liquid.

[0031] Specifically, the rotating disk 604 forms a fixed structure with the ball valve 606 via the connecting rod 605, and the connecting rod 605 is installed between the rotating disk 604 and the ball valve 606.

[0032] Through the above technical solution, the connecting rod 605 can be rotated by manually rotating the rotating disk 604. Through the connection of the connecting rod 605, the ball valve 606 can be rotated, which can open and close the pipe body 603, thereby controlling the discharge of waste liquid.

[0033] Working Principle: When using this two-stage distillation device for NMP waste liquid, firstly, the motor 301 is manually started, which drives the transmission rod 302 to rotate. The rotation of the transmission rod 302 causes the first pulley 303 to rotate synchronously, and the second pulley 305 rotates synchronously via the belt 304. This, in turn, drives the stirring rack 306 to rotate. Then, the extractant is added through the inlet 307, flowing into the stirring rack 306 and out through the holes in the rack, mixing with the waste liquid. The rotation of the stirring rack 306 further agitates the mixture, ensuring thorough mixing. After the waste liquid is distilled, the rotating disc 604 is manually rotated, causing the connecting rod 605 to rotate. The connecting rod 605 then causes the ball valve 606 to rotate synchronously, thus discharging the waste liquid. This completes the entire process. Any content not described in detail in this specification is prior art known to those skilled in the art.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit defined by the appended claims and their equivalents.

Claims

1. A two-stage distillation apparatus for NMP waste liquid, comprising a first distillation column (1), characterized in that: The bottom of the first distillation column (1) is fixedly connected to a base (2), a mixing component (3) is installed inside the first distillation column (1), and a draining component (6) is provided on one side of the first distillation column (1). The mixing component (3) includes a motor (301), the output end of which is detachably connected to a transmission rod (302) via a coupling, and the outer wall of the transmission rod (302) is provided with a first pulley (303), the outer wall of the first pulley (303) is rotatably connected to a belt (304), and the inner wall of the belt (304) is provided with a second pulley (305), the inner wall of the second pulley (305) is rotatably connected to a stirring frame (306), and the top of the stirring frame (306) is provided with a liquid inlet (307), and the top of the liquid inlet (307) is equipped with a cover plate (308). The drainage assembly (6) includes a fixing ring (601), the inner wall of the fixing ring (601) is threaded with a screw (602), the inner wall of the fixing ring (601) is fixedly connected with a pipe body (603), and a rotating disk (604) is provided at the top of the pipe body (603). A connecting rod (605) is fixedly connected at the bottom of the rotating disk (604), and a ball valve (606) is provided at the bottom of the connecting rod (605).

2. The two-stage distillation apparatus for NMP waste liquid according to claim 1, characterized in that: The first distillation column (1) is equipped with a conveying mechanism (4), and a second distillation column (5) is installed on one side of the conveying mechanism (4).

3. The two-stage distillation apparatus for NMP waste liquid according to claim 1, characterized in that: The motor (301) forms a rotating structure with the first pulley (303) through the transmission rod (302), and one end of the transmission rod (302) passes through the first pulley (303). The first pulley (303) forms a rotating structure with the second pulley (305) through the belt (304).

4. The two-stage distillation apparatus for NMP waste liquid according to claim 1, characterized in that: The belt (304) forms a rotating structure with the stirring frame (306) via the second pulley (305), and one end of the stirring frame (306) is set through the second pulley (305).

5. The two-stage distillation apparatus for NMP waste liquid according to claim 1, characterized in that: The second pulley (305) forms a rotating structure with the inlet (307) via the stirring frame (306), and the cover plate (308) is located on top of the inlet (307).

6. The two-stage distillation apparatus for NMP waste liquid according to claim 1, characterized in that: The first distillation column (1) is fixed by screws (602) and fixing rings (601), and there are multiple screws (602). The first distillation column (1) is fixed by fixing rings (601) and tube body (603).

7. The two-stage distillation apparatus for NMP waste liquid according to claim 1, characterized in that: The rotating disk (604) forms a fixed structure with the ball valve (606) through the connecting rod (605), and the connecting rod (605) is installed between the rotating disk (604) and the ball valve (606).

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