A solvent rectification device for chemical waste liquid treatment

Abstract

The present invention relates to the technical field of rectification separation of chemical waste liquid, and particularly relates to a solvent rectification device for treating chemical waste liquid, including a frame, an installation box, a tower body, etc. Two installation boxes are connected to the frame, and the tower body is jointly installed on the two installation boxes, and the installation box and the tower body are communicated. In the present invention, chemical waste liquid can be injected into the tower body through a waste liquid pipe, and a high-boiling solvent can be injected into the tower body through a solvent pipe, breaking the original azeotropic condition and changing the relative volatility between components, so as to achieve rectification separation. The packing can be conveyed upward through a screw conveyor and conveyed into the tower body for loading. The slide plate can be driven to move to the right by a lead screw motor, so that the discharge hole corresponds to the tower body. The old packing falls onto the guide plate through the discharge hole and rolls leftward for discharge, automatically cleaning and replacing the packing, which can save human and material resources and improve safety.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical waste liquid rectification separation, and particularly relates to a solvent rectification device for treating chemical waste liquid. Background Art

[0002] In the process of treating chemical waste liquid, rectification is a widely used separation technology for extracting and purifying valuable solvents or compounds from complex multi-component mixtures. As an efficient rectification device, the packed tower is widely adopted because of its large gas-liquid contact area, low pressure drop and high mass transfer efficiency.

[0003] The working principle of the packed tower is to evenly distribute the liquid material on the surface of the packing inside the tower, and at the same time introduce hot gas (such as steam or hot air), so that the gas phase and the liquid phase fully contact on the surface of the packing, realizing efficient mass transfer and separation.

[0004] The design of the packed tower usually includes components such as structured packing or random packing, liquid distributors, gas inlets, condensers and reboilers, etc. Structured packing (such as corrugated plates, mesh packing) is suitable for large-scale continuous operation and has the characteristics of regular arrangement and high throughput; while random packing (such as Raschig rings, Pall rings) is suitable for small-scale or batch operation. Although the pressure drop is large, it can also provide good separation effect under specific conditions. In addition, the operating conditions of the packed tower (such as temperature, pressure, reflux ratio) need to be optimized according to the specific properties of the waste liquid to ensure the best separation effect and energy utilization efficiency.

[0005] With the increase in the number of rectification times, impurities will gradually accumulate or physical damage will occur to the packing inside the packed tower, resulting in blockage. This blockage will not only reduce the gas-liquid contact efficiency inside the tower, affect the separation effect, but also may cause the system pressure to rise, increasing the operation risk. It is necessary to clean or replace the packing in time. The internal structure of the packed tower is compact, especially the gaps between the structured packing layers are small. Once blockage occurs, the cleaning work is very difficult and requires professional technicians and special tools, which will consume a large amount of human and material resources. Moreover, if the operation is improper during the process of disassembling and reinstalling the packing, it may cause safety accidents, further increasing the maintenance cost and risk. Summary of the Invention

[0006] According to the problems existing in the above background art, the purpose of the present invention is to provide a solvent rectification device for treating chemical waste liquid, which can overcome the disadvantages that the internal structure of the packed tower is compact, especially the gaps between the structured packing layers are small. Once blockage occurs, the cleaning work is very difficult and requires professional technicians and special tools, which will consume a large amount of human and material resources. Moreover, if the operation is improper during the process of disassembling and reinstalling the packing, it may cause safety accidents, further increasing the maintenance cost and risk.

[0007] The technical solution of the present invention is: a solvent rectification device for chemical waste liquid treatment, including a frame, an installation box, a tower body, a waste liquid pipe, a solvent pipe, a hot gas pipe, a hot gas box, a diffusion nozzle, a heater, a discharging mechanism, a loading mechanism and a blocking mechanism. Two installation boxes are connected to the frame, and the tower body is installed on the two installation boxes and is communicated with the installation boxes. The upper part of the tower body is connected with a waste liquid pipe, the top of the waste liquid pipe is connected with a solvent pipe, the lower part of the tower body is connected with a hot gas pipe, and a hot gas box is connected to the hot gas pipe. The hot gas box is located inside the tower body. A diffusion nozzle is installed at the top of the hot gas box, and a one-way valve is provided in each diffusion nozzle. A heater is installed at the lower part of the tower body. The discharging mechanism is used to discharge the old packing in the tower body, the loading mechanism is used to load new packing into the tower body, and the blocking mechanism is used to block the packing in the tower body.

[0008] In addition, particularly preferably, the discharging mechanism includes a guiding frame, a sliding frame, a cylinder, a guiding plate, a guiding board and a sealing component. The guiding frames are connected to the bottom of the installation boxes, and the guiding frames are connected to the tower body. The sliding frames are slidably connected to the bottom of the guiding frames, and cylinders are installed on the guiding frames. The telescopic rods of the cylinders are connected to the sliding frames. The guiding plates are connected to the tops of the sliding frames and are located inside the guiding frames. Guiding boards for guiding the guiding plates are connected inside the guiding frames, and the guiding boards are connected to the tower body. Two discharge ports are opened on the tower body, and the guiding plates are located in these discharge ports, and the guiding plates can enter the tower body through these discharge ports. The old packing in the tower body will fall onto the guiding plates and be discharged through the guiding plates. The sealing component is used to seal the discharge ports on the tower body.

[0009] In addition, particularly preferably, the sealing component includes a sealing plate, a spring and a pushing block. Two sealing plates for sealing the discharge ports on the tower body are slidably connected to the tower body. The bottom of the sealing plate contacts the top of the guiding plate. A spring is connected between the sealing plate and the tower body. Pushing blocks are connected to the tops of the guiding plates, and the pushing blocks are used to push the sealing plates upward so that the sealing plates no longer seal the discharge ports on the tower body.

[0010] In addition, particularly preferably, the loading mechanism includes a screw conveyor, a feeding frame and a sealing component. Screw conveyors are installed on the front and rear sides of the installation boxes, and the feeding frames are connected to the lower parts of the screw conveyors. Two feeding ports are opened on the tower body, and the discharging ends of the screw conveyors face the feeding ports on the tower body. The screw conveyors are used to convey new packing upward, and the new packing enters the tower body through the feeding ports on the tower body. The sealing component is used to seal the feeding ports on the tower body.

[0011] In addition, particularly preferably, the sealing component includes an electric push rod, a feeding pipe and a baffle plate. Electric push rods are installed on the tops of the installation boxes, and the feeding pipes are connected to the telescopic rods of the electric push rods. The feeding pipes can move upward to correspond to the discharging ends of the screw conveyors. Baffle plates for sealing the feeding ports on the tower body are connected to the feeding pipes, and the baffle plates contact the tower body.

[0012] In addition, it is particularly preferred that the blocking mechanism includes a sliding plate, a blocking net and a lead screw motor. Sliding plates are slidably connected inside the installation boxes. Blocking nets for blocking the packing inside the tower body are connected to the sliding plates. Discharge holes are formed in the sliding plates. Lead screw motors are installed inside the installation boxes. The lead screws of the lead screw motors are threadedly connected to the sliding plates to drive the sliding plates to move so that the discharge holes correspond to the tower body.

[0013] In addition, it is particularly preferred that a diffusion box is further included. The lower end of the waste liquid pipe is connected to the diffusion box, and circular holes are evenly spaced at the bottom of the diffusion box.

[0014] In addition, it is particularly preferred that a diffusion plate is further included. The diffusion plate is connected inside the tower body, and through holes are evenly spaced on the diffusion plate.

[0015] In addition, it is particularly preferred that support blocks are further included. The support blocks are connected inside the tower body. When the material guiding plate moves into the tower body, the support blocks will support the material guiding plate.

[0016] In addition, it is particularly preferred that a material guiding frame is further included. The material guiding frame is connected to the frame, and the old packing will fall into the material guiding frame along the material guiding plate.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The present invention can inject chemical waste liquid into the tower body through the waste liquid pipe, and inject high-boiling solvents into the tower body through the solvent pipe, breaking the original azeotropic conditions and changing the relative volatility between components, so as to achieve rectification separation. The packing can be conveyed upward through the screw conveyor and conveyed into the tower body for loading. The lead screw motor can drive the sliding plate to move to the right so that the discharge hole corresponds to the tower body. The old packing falls onto the material guiding plate through the discharge hole and rolls to the left for discharge, automatically cleaning and replacing the packing, which can save human and material resources and improve safety. Description of the Drawings

[0019] Figure 1 Shows a three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2 Shows a three-dimensional structural schematic diagram of the hot gas pipe and the heater of the present invention.

[0021] Figure 3 Shows a first cross-sectional view of the installation box and the tower body of the present invention.

[0022] Figure 4 Shows a three-dimensional structural schematic diagram of the hot gas box and the diffusion nozzle of the present invention.

[0023] Figure 5 Shows a three-dimensional structural schematic diagram of the unloading mechanism of the present invention.

[0024] Figure 6 Shows a cross-sectional view of the guiding frame of the present invention.

[0025] Figure 7 Shows a second cross-sectional view of the installation box and the tower body of the present invention.

[0026] Figure 8 Shows a schematic three-dimensional structure diagram of the sealing plate and the spring of the present invention.

[0027] Figure 9 Shows a schematic three-dimensional structure diagram of the material guiding plate, the sealing plate, the spring and the pushing block of the present invention.

[0028] Figure 10 Shows a schematic three-dimensional structure diagram of the loading mechanism of the present invention.

[0029] Figure 11 Shows a schematic three-dimensional structure diagram of the blocking mechanism of the present invention.

[0030] Figure 12 Shows a cross-sectional view of the installation box of the present invention.

[0031] Figure 13 Shows a third cross-sectional view of the installation box and the tower body of the present invention.

[0032] Figure 14 Shows a schematic three-dimensional structure diagram of the diffusion box and the round holes of the present invention.

[0033] Figure 15 Shows a schematic three-dimensional structure diagram of the diffusion plate and the through holes of the present invention.

[0034] In the figure: 1, frame; 2, installation box; 3, tower body; 4, waste liquid pipe; 5, solvent pipe; 6, hot gas pipe; 7, hot gas box; 8, diffusion nozzle; 9, heater; 101, guiding frame; 102, sliding frame; 103, cylinder; 104, material guiding plate; 105, guiding plate; 106, sealing plate; 107, spring; 108, pushing block; 111, screw conveyor; 112, feeding frame; 113, electric push rod; 114, feeding pipe; 115, baffle plate; 121, sliding plate; 122, retaining net; 123, discharge hole; 124, screw motor; 131, diffusion box; 132, round hole; 141, diffusion plate; 142, through hole; 15, support block; 16, material guiding frame. Detailed implementation manners

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0036] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings. It should be noted that the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Referring to Figures 1 - 12 , a solvent rectification device for chemical waste liquid treatment, comprising a frame 1, a mounting box 2, a tower body 3, a waste liquid pipe 4, a solvent pipe 5, a hot gas pipe 6, a hot gas box 7, a diffusion nozzle 8, a heater 9, a discharging mechanism, a loading mechanism and a blocking mechanism. Two mounting boxes 2 are connected to the upper part of the frame 1 by bolts. The two mounting boxes 2 are arranged vertically one above the other. The tower body 3 is mounted on the two mounting boxes 2 together, and the mounting box 2 and the tower body 3 are communicated. The upper right part of the tower body 3 is connected to the waste liquid pipe 4, the top of the waste liquid pipe 4 is connected to the solvent pipe 5, the lower right part of the tower body 3 is connected to the hot gas pipe 6, the upper end of the hot gas pipe 6 is connected to the hot gas box 7, the hot gas box 7 is located inside the tower body 3, and diffusion nozzles 8 are evenly spaced and installed at the top of the hot gas box 7. The diffusion nozzles 8 are evenly spaced, which can make the hot gas evenly distributed inside the tower body 3. One-way valves are provided in each of the diffusion nozzles 8. Under the action of the one-way valves, the hot gas in the hot gas box 7 can be ejected through the diffusion nozzles 8, and the liquid cannot enter the hot gas box 7 through the diffusion nozzles 8. Four heaters 9 are evenly spaced and installed circumferentially at the lower part of the tower body 3. The four heaters 9 surround the lower part of the tower body 3, which can make the lower part of the tower body 3 heat more evenly. The discharging mechanism is used to discharge the old packing inside the tower body 3, the loading mechanism is used to load new packing into the tower body 3, and the blocking mechanism is used to block the packing inside the tower body 3.

[0038] Referring to Figures 5 - 9, the discharging mechanism includes a guiding frame 101, a sliding frame 102, a cylinder 103, a material guiding plate 104, a guiding plate 105 and a plugging assembly. The bottom of the installation box 2 is bolted with a guiding frame 101, and the guiding frame 101 is connected to the tower body 3. The bottom of the guiding frame 101 is slidably connected with a sliding frame 102. The front side of the guiding frame 101 is bolted with a cylinder 103, and the telescopic rod of the cylinder 103 is connected to the sliding frame 102. The top of the sliding frame 102 is connected with a material guiding plate 104. The material guiding plate 104 is located inside the guiding frame 101 and is inclined, so that the filler can roll better along the material guiding plate 104 to the left. The front and rear sides of the inner bottom of the guiding frame 101 are connected with guiding plates 105. The right side of the guiding plate 105 is connected to the left side of the tower body 3. The guiding plate 105 can guide the material guiding plate 104 to make it move more smoothly. The upper and lower sides of the left side of the tower body 3 are provided with discharge ports. The material guiding plate 104 is located in this discharge port, and the material guiding plate 104 can enter the tower body 3 through this discharge port. The plugging assembly is used to seal the discharge port on the tower body 3.

[0039] Refer to Figure 6 , Figure 8 and Figure 9 , the plugging assembly includes a plugging plate 106, a spring 107 and a pushing block 108. The upper and lower sides of the left side of the tower body 3 are slidably connected with a plugging plate 106. The bottom of the plugging plate 106 contacts the top of the material guiding plate 104. Four springs 107 are connected between the top of the plugging plate 106 and the tower body 3. The middle of the top of the material guiding plate 104 is connected with a pushing block 108, and the top of the pushing block 108 is an inclined surface.

[0040] Refer to Figure 10 , the loading mechanism includes a screw conveyor 111, a feeding frame 112 and a sealing component. The front and rear sides of the installation box 2 are bolted with a screw conveyor 111. The lower part of the screw conveyor 111 is connected with a feeding frame 112. The feeding frame 112 is inclined, so that the filler can roll better along the feeding frame 112 into the screw conveyor 111. The front and rear sides of the tower body 3 are provided with feeding ports. The discharging end of the screw conveyor 111 faces the feeding port on the tower body 3. The sealing component is used to seal the feeding port on the tower body 3.

[0041] Refer to Figure 10 , the sealing component includes an electric push rod 113, a feeding pipe 114 and a baffle plate 115. The top of the installation box 2 is bolted with an electric push rod 113. The telescopic rod of the electric push rod 113 is connected with a feeding pipe 114. When the feeding pipe 114 moves upward, it can correspond to the discharging end of the screw conveyor 111. A baffle plate 115 is connected to the feeding pipe 114, and the baffle plate 115 contacts the tower body 3.

[0042] Refer to Figure 11 and Figure 12, the blocking mechanism includes a sliding plate 121, a blocking net 122 and a lead screw motor 124. The sliding plates 121 are all slidably connected in the installation box 2. The right parts of the sliding plates 121 are all connected with the blocking net 122. The left parts of the sliding plates 121 are all provided with discharge holes 123. The lead screw motors 124 are all installed on the front side in the installation box 2. The lead screws of the lead screw motors 124 are threadedly connected with the sliding plates 121.

[0043] In the initial state, the baffle plate 115 seals the feed inlet on the tower body 3. The staff can control the telescopic rod of the electric push rod 113 to extend, driving the guide plate 104 and the baffle plate 115 to move upward. The upward movement of the feed pipe 114 can correspond to the discharge end of the screw conveyor 111. At this time, the baffle plate 115 no longer seals the feed inlet on the tower body 3, and the feed pipe 114 corresponds to the feed inlet on the tower body 3. Then, the packing is poured into the feed frame 112, and the packing rolls along the feed frame 112 into the screw conveyor 111. The screw conveyor 111 conveys the packing upward, and the packing enters the feed pipe 114 through the discharge end of the screw conveyor 111. Subsequently, the packing falls onto the retaining net 122 through the feed pipe 114 and the feed inlet on the tower body 3 for loading. The retaining net 122 can block the packing. After the loading is completed, the screw conveyor 111 is turned off, and then the staff controls the telescopic rod of the electric push rod 113 to shorten, driving the guide plate 104 and the baffle plate 115 to move downward. The feed pipe 114 and the discharge end of the screw conveyor 111 are offset, and the baffle plate 115 seals the feed inlet on the tower body 3 again. The staff then injects chemical waste liquid into the tower body 3 through the waste liquid pipe 4 and injects a high-boiling solvent (such as an extractant. Selecting a suitable extractant can significantly change the volatility of the target component and is easy to recover and reuse) into the tower body 3 through the solvent pipe 5 to break the original azeotropic condition and change the relative volatility between components, thereby achieving rectification separation. The liquid phase falls from the top of the tower body 3 downward onto the packing, and the liquid phase can pass through the retaining net 122 and fall downward. Connect the hot air pipe 6 to the hot air pump, and the hot air enters the hot air box 7 through the hot air pipe 6 and is sprayed out through the diffusion nozzle 8. The diffusion nozzle 8 can disperse the hot air so that the hot air can be evenly distributed inside the tower body 3. The gas phase flows upward from the bottom of the tower body 3, and the gas phase and the liquid phase come into full contact on the surface of the packing. The packing can provide a large gas-liquid contact area, enabling the mass transfer process to proceed efficiently. Different components in the solvent volatilize and condense at the gas-liquid interface. The lighter components are more likely to volatilize into the gas phase, while the heavier components remain in the liquid phase, thus achieving separation. The gas phase is discharged from the top of the tower body 3, and the liquid phase is discharged from the bottom of the tower body 3. A condenser can be set at the top of the tower body 3 to cool the gas phase into a liquid and collect it. The heater 9 can heat the bottom of the tower body 3 to determine the optimal operating temperature to ensure that the heavy components evaporate fully. In the initial state, the telescopic rod of the cylinder 103 is in the extended state. When the packing inside the tower body 3 needs to be replaced, the staff controls the telescopic rod of the cylinder 103 to shorten, driving the sliding frame 102 to move to the right. The sliding frame 102 drives the guide plate 104 to move to the right, and the guide plate 104 will move into the tower body 3. The rightward movement of the guide plate 104 drives the push block 108 to move to the right. The inclined surface on the push block 108 can push the plugging plate 106 upward, and the spring 107 is compressed. The plugging plate 106 no longer seals the discharge port on the tower body 3. Then, the staff controls the screw motor 124 to drive the slide plate 121 and the retaining net 122 to move to the right, causing the retaining net 122 to be offset from the tower body 3.Align the discharge hole 123 with the tower body 3. The old packing falls onto the material guiding plate 104 through the discharge hole 123, and then the old packing rolls left along the material guiding plate 104 and the guiding frame 101 and is discharged. It can automatically clean and replace the packing, saving human and material resources and improving safety. After all the old packing is discharged, control the lead screw motor 124 to drive the retaining net 122 to move left, align the retaining net 122 with the tower body 3, and stagger the discharge hole 123 from the tower body 3, and then add new packing.

[0044] Refer to Figure 13 and Figure 14 It further includes a diffusion box 131. The lower end of the waste liquid pipe 4 is connected to the diffusion box 131. The bottom of the diffusion box 131 is evenly spaced with round holes 132. Chemical waste liquid and solvent will enter the diffusion box 131, and the liquid will be discharged through the round holes 132. The round holes 132 are evenly spaced to ensure that the liquid can be evenly distributed on the packing and avoid channeling phenomenon.

[0045] Refer to Figure 12 and Figure 15 It further includes a diffusion plate 141. The middle and lower parts inside the tower body 3 are both connected with the diffusion plate 141. The diffusion plate 141 is evenly spaced with through holes 142. The liquid will fall onto the diffusion plate 141 and be discharged through the through holes 142. The through holes 142 are evenly spaced to ensure that the liquid can be evenly distributed on the packing and avoid channeling phenomenon.

[0046] Refer to Figure 7 It further includes a support block 15. The upper and lower sides on the right side inside the tower body 3 are both connected with the support block 15. When the material guiding plate 104 moves right into the tower body 3, the bottom of the material guiding plate 104 will contact the top of the support block 15, and the support block 15 can support the material guiding plate 104 to improve the stability of the material guiding plate 104.

[0047] Refer to Figure 1 It further includes a material guiding frame 16. The upper and lower sides on the left side of the frame 1 are both connected with the material guiding frame 16 by bolts. The old packing will roll left along the material guiding plate 104 and the guiding frame 101 into the material guiding frame 16, and the material guiding frame 16 can gather the old packing for convenient subsequent collection.

[0048] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all the embodiments. It only expresses the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation to the scope of the patent of the present invention.

[0049] It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications, changes in quantity, improvements and substitutions can be made. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims

1. A solvent rectification device for chemical waste liquid treatment, comprising a frame (1), an installation box (2) and a tower body (3). Two installation boxes (2) are connected to the frame (1), and the tower body (3) is jointly installed on the two installation boxes (2), and the installation box (2) is communicated with the tower body (3), and it is characterized in that: It also includes a waste liquid pipe (4), a solvent pipe (5), a hot gas pipe (6), a hot gas box (7), a diffusion nozzle (8), a heater (9), a discharging mechanism, a loading mechanism and a blocking mechanism. The upper part of the tower body (3) is connected with the waste liquid pipe (4), the top of the waste liquid pipe (4) is connected with the solvent pipe (5), the lower part of the tower body (3) is connected with the hot gas pipe (6), the hot gas pipe (6) is connected with the hot gas box (7), the hot gas box (7) is located inside the tower body (3), the top of the hot gas box (7) is equipped with the diffusion nozzle (8), and there is a one-way valve in each of the diffusion nozzles (8). The heater (9) is installed at the lower part of the tower body (3). The discharging mechanism is used to discharge the old packing inside the tower body (3), the loading mechanism is used to load new packing into the tower body (3), and the blocking mechanism is used to block the packing inside the tower body (3); The discharging mechanism includes a guiding frame (101), a sliding frame (102), a cylinder (103), a guiding plate (104), a guiding board (105) and a blocking component. The bottom of the installation box (2) is connected with the guiding frame (101), the guiding frame (101) is connected with the tower body (3), the bottom of the guiding frame (101) is slidably connected with the sliding frame (102), the cylinder (103) is installed on each of the guiding frames (101), the telescopic rod of the cylinder (103) is connected with the sliding frame (102), the top of the sliding frame (102) is connected with the guiding plate (104), the guiding plate (104) is located inside the guiding frame (101), and the guiding board (105) for guiding the guiding plate (104) is connected inside the guiding frame (101), the guiding board (105) is connected with the tower body (3). There are two discharge openings on the tower body (3), the guiding plate (104) is located in this discharge opening, and the guiding plate (104) can enter the tower body (3) through this discharge opening. The old packing inside the tower body (3) will fall onto the guiding plate (104) and be discharged through the guiding plate (104). The blocking component is used to block the discharge opening on the tower body (3); The blocking component includes a blocking plate (106), a spring (107) and a pushing block (108). Two blocking plates (106) for blocking the discharge opening on the tower body (3) are slidably connected to the tower body (3), the bottom of the blocking plate (106) contacts the top of the guiding plate (104), a spring (107) is connected between the blocking plate (106) and the tower body (3), and the pushing block (108) is connected to the top of the guiding plate (104). The pushing block (108) is used to push the blocking plate (106) upward so that the blocking plate (106) no longer blocks the discharge opening on the tower body (3);The blocking mechanism includes sliding plates (121), retaining nets (122) and lead screw motors (124). Sliding plates (121) are slidably connected inside the installation boxes (2). Retaining nets (122) for blocking the filler inside the tower body (3) are connected to the sliding plates (121). Drain holes (123) are formed in the sliding plates (121). Lead screw motors (124) are installed inside the installation boxes (2). The lead screws of the lead screw motors (124) are threadedly connected to the sliding plates (121) to drive the sliding plates (121) to move, so that the drain holes (123) correspond to the tower body (3).; 2. The solvent rectification device for chemical waste liquid treatment according to claim 1, characterized in that: The feeding mechanism includes a screw conveyor (111), a feeding frame (112) and a sealing component. Screw conveyors (111) are installed on both the front and rear sides of the installation box (2). The lower parts of the screw conveyors (111) are all connected to the feeding frame (112). Two feeding ports are formed on the tower body (3). The discharging ends of the screw conveyors (111) face the feeding ports on the tower body (3). The screw conveyors (111) are used to convey new filler upwards. The new filler enters the tower body (3) through the feeding ports on the tower body (3). The sealing component is used to seal the feeding ports on the tower body (3).

3. A solvent rectification device for chemical waste liquid treatment according to claim 2, characterized in that: The sealing component includes an electric push rod (113), a feeding pipe (114) and a baffle plate (115). Electric push rods (113) are installed on the top of the installation box (2). The telescopic rods of the electric push rods (113) are all connected to the feeding pipes (114). When the feeding pipes (114) move upwards, they can correspond to the discharging ends of the screw conveyors (111). Baffle plates (115) for sealing the feeding ports on the tower body (3) are connected to the feeding pipes (114). The baffle plates (115) are in contact with the tower body (3).

4. The solvent rectification device for chemical waste liquid treatment according to claim 3, characterized in that: It also includes a diffusion box (131). The lower end of the waste liquid pipe (4) is connected to the diffusion box (131). Circular holes (132) are evenly spaced at the bottom of the diffusion box (131).

5. The solvent rectification device for chemical waste liquid treatment according to claim 4, characterized in that: It also includes a diffusion plate (141). The diffusion plate (141) is connected inside the tower body (3). Through holes (142) are evenly spaced on the diffusion plate (141).

6. The solvent rectification device for chemical waste liquid treatment according to claim 5, wherein: It also includes a support block (15). The support block (15) is connected inside the tower body (3). When the guide plate (104) moves into the tower body (3), the support block (15) will support the guide plate (104).

7. The solvent rectification device for chemical waste liquid treatment according to claim 6, wherein: It also includes a guide frame (16). The guide frame (16) is connected to the frame (1). The old filler will fall into the guide frame (16) along the guide plate (104).

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