Reduced pressure distillation device for pesticide synthesis

Abstract

The invention relates to the technical field of pesticide production, and particularly discloses a pesticide synthesis reduced pressure distillation device which comprises a negative pressure distillation retort, a heating base is arranged on the lower portion of the negative pressure distillation retort, a thermometer is installed at the upper end of the negative pressure distillation retort, a collecting container is arranged on one side of the heating base, and the collecting container is connected with the negative pressure distillation retort. A refrigerating tank is arranged on the front side of the collecting container, the lower portion of the refrigerating tank is connected with a water injection pipe, the outer end of the water injection pipe is connected with a cold water pipe, and the cold water pipe is sleeved with a circulating pipe. The condensation path is flexible and adjustable, the cooling time and the heat exchange effect are optimized, the condensation efficiency is improved, seamless connection from synthesis to distillation is achieved, the thermal decomposition risk is reduced, the recovery rate of effective components is improved, the convenience of operation and maintenance is improved through the modular design, quick replacement of parts is supported, the production requirement change is adapted, and the production cost is reduced. And the waste gas is effectively treated through multiple treatment mechanisms, so that a closed-loop system is formed, and the sustainability is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide production, in particular to a pesticide synthesis vacuum distillation device. Background Art

[0002] Pesticides are chemical substances used in agriculture to control pests, weeds and other harmful organisms. According to their mechanism of action and use, pesticides can be divided into several categories, including insecticides, fungicides, herbicides and miticides. The use of pesticides helps to improve agricultural production efficiency, but it is also necessary to pay attention to their potential impacts on the environment and human health. Reasonable application of pesticides, including choosing the appropriate type, amount and time of application, can effectively reduce the negative impact on the ecology.

[0003] In pesticide production, it is often necessary to remove the reaction solvent after the synthesis reaction. Vacuum distillation can efficiently complete this process. Vacuum distillation in pesticide synthesis is a commonly used separation and purification technology. Its principle is to reduce the pressure in the system and lower the boiling point of the liquid, thereby performing distillation at a lower temperature. It is particularly suitable for heat-sensitive compounds and is mainly used to extract and purify the active ingredients produced in the synthesis process and remove impurities to improve the purity of pesticides.

[0004] However, the existing distillation device may be limited in adjusting and adapting to different process requirements (such as the lack of flexible adjustment of the condensation path, resulting in poor cooling effect of the gas phase liquid medicine, and the inability to make appropriate adjustments according to the evaporation characteristics of different liquid medicines, which may cause the cooling time to be extended, thereby reducing the condensation efficiency and increasing the steam loss, affecting the overall production efficiency), and the links are not smoothly connected, affecting the overall equipment operation efficiency and the smoothness of the production process. Therefore, the present invention proposes a pesticide synthesis vacuum distillation device to solve the problems mentioned in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a pesticide synthesis vacuum distillation device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A pesticide synthesis vacuum distillation device, comprising a negative pressure distillation tank, a heating base is arranged at the lower part of the negative pressure distillation tank, a thermometer is installed at the upper end of the negative pressure distillation tank, a collecting container is arranged at one side of the heating base, a refrigeration tank is arranged at the front side of the collecting container, a water injection pipe is connected to the lower part of the refrigeration tank, a cold water pipe is connected to the outer end of the water injection pipe, and a circulating pipe is arranged outside the cold water pipe;

[0008] The upper end of the circulation pipe is connected with a hose, the other end of the hose is communicated with the upper part of the negative pressure distillation tank, one end of the hose is connected with a drain pipe, the lower side of the lower end of the circulation pipe is connected with a movable pipe, a sleeve seat is fixedly installed on the upper side of the collection container, the movable pipe slides inside and outside the sleeve seat, a auger is fixed inside the circulation pipe, and the inner circulation of the auger closely adheres to the surface of the cold water pipe.

[0009] Preferably, a vacuum pump is installed on one side of the negative pressure distillation tank, the vacuum pump is used to reduce the pressure of the negative pressure distillation tank, and a filling pipe is arranged on the other side of the negative pressure distillation tank, and the filling pipe is used to fill the synthetic pesticide solution.

[0010] Preferably, a frame seat is fixedly installed at the lower end of the circulation pipe, the frame seat is in a "C" shape, and the frame seat slides around the cold water pipe. A sealing ring is installed at the through port of the cold water pipe corresponding to the lower end of the circulation pipe, and the circulation pipe and the auger inside it are sleeved and slide around the cold water pipe.

[0011] Preferably, a screw head is threadedly connected to the frame seat, a turning knob is fixed to the outer end of the screw head, and a rubber head is connected to the inner end of the screw head. The rubber head presses against the surface of the cold water pipe, and the position of the circulation pipe on the cold water pipe is fixed by the screw head.

[0012] Preferably, the inner end of the water injection pipe is connected with a water pump located inside the refrigeration tank. A valve II is installed at the connection between the water injection pipe and the cold water pipe, and a valve I is installed at the connection between the cold water pipe and the drain pipe.

[0013] Preferably, a discharge port is opened at one corner of the collection container. A tail gas pipe is connected between the sleeve seat and the tail gas treatment box, and a one-way valve is installed at the connection between the tail gas pipe and the tail gas treatment box. The distillation waste gas is discharged into the tail gas treatment box through the tail gas pipe.

[0014] Preferably, a washing chamber, an adsorption chamber and a combustion chamber are installed in the tail gas treatment box. The acidic or alkaline components in the tail gas are removed by washing, harmful components are adsorbed by activated carbon in the adsorption chamber, and harmful gases in the combustion chamber are burned and decomposed into harmless gases.

[0015] Preferably, a controller is arranged on the front side of the heating base, the controller is electrically connected with the heating element inside the heating base, and the controller controls the heat output of the heating base.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The design of the present invention focuses on the flexibility of the condensation path, especially the adjustability of the circulation pipe. The operator can adjust the path of the gas phase liquid medicine in the cold water pipe by rotating the screw head on the frame seat, allowing the path length to be flexibly changed according to the evaporation characteristics of the liquid medicine, thereby optimizing the cooling time and enhancing the heat exchange effect. Through appropriate adjustment, the condensation efficiency can be effectively improved, ensuring that the gas phase liquid medicine is quickly condensed in the first time, reducing steam loss, and thus improving the overall production efficiency;

[0018] 2. The design of the present invention realizes seamless connection from synthesis to distillation and then to collection, greatly improving work efficiency. By reducing negative pressure through a vacuum pump, the drug liquid can evaporate at a lower temperature, reducing the risk of thermal decomposition and ensuring the maximum recovery rate of the effective ingredients. The optimization of the condensation structure enables the gas phase drug liquid to be quickly cooled and converted into a liquid state and flow into the collection container. At the same time, the drainage pipe and outlet equipped with the equipment facilitate rapid discharge of room temperature water after shutdown, ensuring the high efficiency of the system when it is used next time. This efficient full-process design not only saves time, but also ensures the quality and purity of the product;

[0019] 3. The present invention adopts a modular design, which improves the convenience of operation and the flexibility of maintenance. Each component (such as the cold water pipe, the circulation pipe and the vacuum pump) can be disassembled separately for easy cleaning and maintenance. The design allows operators to quickly replace parts as needed, reducing downtime. In addition, the modular design also allows flexible adjustment and expansion according to changes in production needs (for example, the equipment can add or replace specific condensing elements or controllers according to different pesticide synthesis requirements), thereby improving its adaptability and production efficiency;

[0020] 4. The design of the present invention reflects the device's emphasis on environmental protection, ensuring that the waste gas generated during the distillation process can be effectively treated to reduce the impact on the environment. The treatment system adopts a multiple treatment mechanism of washing, adsorption and combustion chamber, which can effectively remove acidic and alkaline components and volatile organic compounds (VOCs) to ensure the safety of exhaust gas. In addition, the tail gas treatment is combined with the distillation process to form a closed-loop system to achieve resource recovery and reuse, thereby improving the environmental protection and sustainability of the entire process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a pesticide synthesis vacuum distillation device proposed by the present invention Figure 1 ;

[0022] Figure 2 A schematic diagram of the structure of a pesticide synthesis vacuum distillation device proposed by the present invention Figure 2 ;

[0023] Figure 3 A schematic diagram of the structure of a pesticide synthesis vacuum distillation device proposed by the present invention Figure 3 ;

[0024] Figure 4 This is a schematic diagram of the top view of a vacuum distillation device for pesticide synthesis proposed by the present invention;

[0025] Figure 5 A schematic diagram of the side cross-sectional connection structure of a circulation pipe in a pesticide synthesis vacuum distillation device proposed by the present invention;

[0026] Figure 6 This is a schematic diagram of the connection structure of a circulation pipe in a pesticide synthesis vacuum distillation device proposed by the present invention;

[0027] Figure 7 The present invention provides a schematic diagram of the connection structure of a cold water pipe in a pesticide synthesis vacuum distillation device.

[0028] In the figure: 1. Negative pressure distillation tank; 2. Heating base; 3. Controller; 4. Collecting container; 5. Exhaust treatment box; 6. Vacuum pump; 7. Circulation pipe; 8. Refrigeration tank; 9. Auger; 10. Casing seat; 11. Exhaust pipe; 12. Water injection pipe; 13. Drain pipe; 14. Cold water pipe; 15. Valve one; 16. Valve two; 17. Filling pipe; 18. Thermometer; 19. Hose; 20. Frame seat; 21. Screw head; 22. Sealing ring; 23. Rubber head; 24. Movable pipe; 25. Discharge outlet. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] Reference Figure 1-7 , a pesticide synthesis vacuum distillation device, comprising a negative pressure distillation tank 1, a heating base 2 is arranged at the lower part of the negative pressure distillation tank 1, a thermometer 18 is installed at the upper end of the negative pressure distillation tank 1, a collecting container 4 is arranged on one side of the heating base 2, and a refrigeration tank 8 is arranged on the front side of the collecting container 4, a water injection pipe 12 is connected to the lower part of the refrigeration tank 8, a cold water pipe 14 is connected to the outer end of the water injection pipe 12, a circulation pipe 7 is arranged on the outer side of the cold water pipe 14, and the cold water pipe 14 and the circulation pipe 7 arranged on the outer side form a condenser structure, a vacuum pump 6 is installed on one side of the negative pressure distillation tank 1, and the vacuum pump 6 is used to reduce the pressure of the negative pressure distillation tank 1, and a filling pipe 17 is arranged on the other side of the negative pressure distillation tank 1, and the filling pipe 17 is used to fill the synthetic pesticide liquid, according to the characteristics of the boiling point of the purified synthetic pesticide, the vacuum in the negative pressure distillation tank 1 is reduced to an appropriate value by the vacuum pump 6, and some components in the mixture are evaporated at a lower temperature, thereby achieving separation;

[0031] Furthermore, a controller 3 is provided on the front side of the heating base 2. The controller 3 is electrically connected to the heating element inside the heating base 2. The controller 3 controls the heat output of the heating base 2, and heats the synthetic pesticide liquid in the negative pressure distillation tank 1 through the heating base 2. When the liquid medicine reaches the boiling point, it evaporates. The upper end of the circulation pipe 7 is connected to a hose 19, and the other end of the hose 19 communicates with the upper part of the negative pressure distillation tank 1. The evaporated gas-phase liquid medicine enters the circulation pipe 7 through the hose 19. The inner end of the water injection pipe 12 is connected to a water pump located in the refrigeration tank 8. A second valve 16 is installed at the connection between the water injection pipe 12 and the cold water pipe 14. The refrigeration tank 8 is internally equipped with a refrigeration element, which cools the water added to it. When the second valve 16 is opened, the cold water in the refrigeration tank 8 is introduced into the connected cold water pipe 14 through the water injection pipe 12 and the water pump. The gas-phase liquid medicine entering the circulation pipe 7 must pass through the cold water pipe 14 before discharging from the lower end of the circulation pipe 7. A auger 9 is fixed inside the circulation pipe 7, and the inner circulation of the auger 9 closely adheres to the surface of the cold water pipe 14. The setting of the auger 9 makes the gas-phase liquid medicine must circulate around the surface of the cold water pipe 14, thereby increasing the contact time between the gas-phase liquid medicine and the cold surface of the cold water pipe 14, and then ensuring the effect of complete condensation of the gas-phase liquid medicine;

[0032] Even further, a movable pipe 24 is connected to the lower side of the lower end of the circulation pipe 7. A sleeve base 10 is fixedly installed on the upper side of the collection container 4. The movable pipe 24 slides inside and outside the sleeve base 10. The lower end of the circulation pipe 7 is fixedly installed with a frame base 20. The frame base 20 is in a "C" shape, and the frame base 20 slides on the periphery of the cold water pipe 14. A sealing ring 22 is installed at the corresponding opening of the cold water pipe 14 at the lower end of the circulation pipe 7, and the circulation pipe 7 and the auger 9 inside it are sleeved and slide on the periphery of the cold water pipe 14. A screw head 21 is threadedly connected to the frame base 20. The outer end of the screw head 21 is fixed with a turning knob, and the inner end of the screw head 21 is connected with a rubber head 23. The rubber head 23 is pressed against the surface of the cold water pipe 14. The position of the circulation pipe 7 on the cold water pipe 14 is fixed through the screw head 21. The distance that the gas-phase liquid medicine passes through the surface of the cold water pipe 14 can be reasonably designed according to the evaporation amount and boiling point of the liquid medicine. Sliding the circulation pipe 7 on the cold water pipe 14 upward can reduce the distance passing through the cold water pipe 14, and sliding the cold water pipe 14 downward increases the distance passing through the cold water pipe 14. The movable pipe 24 connected to the lower end of the circulation pipe 7 always slides in the corresponding sleeve base 10 to ensure that the condensed liquid medicine flows into the collection container 4. After determining the position of the circulation pipe 7 on the cold water pipe 14, by tightening the screw head 21 on the frame base 20, the rubber head 23 at the inner end of the screw head 21 is pressed against the surface of the cold water pipe 14, thereby fixing the position of the circulation pipe 7 on the cold water pipe 14. By adjusting the distance passing through the cold water pipe 14, a higher cooling efficiency is achieved, ensuring that the completely condensed liquid medicine can quickly pass through the condensation structure for the first time and enter the collection container 4, thereby improving the distillation efficiency of the synthetic pesticide;

[0033] Furthermore, a tail gas pipe 11 is connected between the sleeve seat 10 and the tail gas treatment box 5, and a one-way valve is installed at the connection between the tail gas pipe 11 and the tail gas treatment box 5. The distilled waste gas is discharged into the tail gas treatment box 5 through the tail gas pipe 11. The tail gas treatment box 5 is equipped with a washing chamber, an adsorption chamber and a combustion chamber. The acidic or alkaline components in the tail gas are removed by washing, and the activated carbon in the adsorption chamber adsorbs harmful components. The harmful gas in the combustion chamber is burned and decomposed into harmless gas, and the uncondensed steam continues to remain in a gaseous state and enters the connected tail gas treatment box 5 through the tail gas pipe 11. The gas is sprayed with water or a chemical solution in the washing chamber to remove the acidic or alkaline components and reduce the corrosiveness and toxicity of the gas. The washed gas passes through the activated carbon layer in the adsorption chamber to remove harmful components such as volatile organic compounds (VOCs), and the harmful gas after adsorption treatment is sent to the catalytic burner in the combustion chamber, burned under the action of the catalyst, and converted into harmless gas (CO2 and H2O). The treated gas is safely released into the atmosphere through the exhaust pipe;

[0034] Furthermore, one end of the hose 19 is connected to a drain pipe 13, and a valve 15 is installed at the connection between the cold water pipe 14 and the drain pipe 13. After a period of distillation and condensation, the cold water inside the cold water pipe 14 will return to normal temperature or even heat up, and the condensation effect of the condensation mechanism is not always maintained in a steady state. The normal temperature water in the cold water pipe 14 needs to be discharged, and the valve 15 is opened to discharge the normal temperature water, and then the valve 2 16 is opened to continue to inject cold water into the cold water pipe 14 through the water injection pipe 12. A discharge port 25 is opened at a corner of the collecting container 4. After the equipment stops operating, the discharge port 25 can be opened and the negative pressure distillation tank 1 can be recovered to collect the distilled and purified synthetic pesticides.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pesticide synthesis vacuum distillation device, comprising a negative pressure distillation tank (1), characterized in that: A heating base (2) is provided at the lower part of the negative pressure distillation tank (1). A thermometer (18) is installed at the upper end of the negative pressure distillation tank (1). A collection container (4) is provided on one side of the heating base (2). A refrigeration tank (8) is provided on the front side of the collection container (4). A water injection pipe (12) is connected to the lower part of the refrigeration tank (8). The outer end of the water injection pipe (12) is connected to a cold water pipe (14). A circulation pipe (7) is sleeved outside the cold water pipe (14). The upper end of the circulation pipe (7) is connected to a hose (19). The other end of the hose (19) communicates with the upper part of the negative pressure distillation tank (1). One end of the hose (19) is connected to a drain pipe (13). The lower end of the circulation pipe (7) is connected to a movable pipe (24). A sleeve seat (10) is fixedly installed on the upper side of the collection container (4). The movable pipe (24) slides inside and outside the sleeve seat (10). A auger (9) is fixed inside the circulation pipe (7), and the inner circulation of the auger (9) closely adheres to the surface of the cold water pipe (14).

2. The pesticide synthesis vacuum distillation apparatus according to claim 1, characterized in that: A vacuum pump (6) is installed on one side of the negative pressure distillation tank (1). The vacuum pump (6) is used to reduce the pressure of the negative pressure distillation tank (1). A filling pipe (17) is provided on the other side of the negative pressure distillation tank (1). The filling pipe (17) is used to fill the synthetic pesticide solution.

3. The pesticide synthesis vacuum distillation apparatus according to claim 1, characterized in that: A frame seat (20) is fixedly installed at the lower end of the circulation pipe (7). The frame seat (20) is in a "C" shape, and the frame seat (20) slides on the periphery of the cold water pipe (14). A sealing ring (22) is installed at the opening of the circulation pipe (7) corresponding to the cold water pipe (14). The circulation pipe (7) and the auger (9) inside it are sleeved and slide on the periphery of the cold water pipe (14).

4. The pesticide synthesis vacuum distillation apparatus according to claim 3, characterized in that: A screw head (21) is threadedly connected to the frame seat (20). A turning knob is fixed to the outer end of the screw head (21), and a rubber head (23) is转接ed to the inner end of the screw head (21). The rubber head (23) tightly adheres to the surface of the cold water pipe (14). The position of the circulation pipe (7) on the cold water pipe (14) is fixed by the screw head (21).

5. The pesticide synthesis vacuum distillation apparatus according to claim 1, characterized in that: The inner end of the water injection pipe (12) is connected to a water pump located inside the refrigeration tank (8). A valve two (16) is installed at the connection between the water injection pipe (12) and the cold water pipe (14). A valve one (15) is installed at the connection between the cold water pipe (14) and the drain pipe (13).

6. The pesticide synthesis vacuum distillation apparatus according to claim 1, characterized in that: A discharge port (25) is opened at one corner of the collection container (4). A tail gas pipe (11) is connected between the sleeve seat (10) and the tail gas treatment box (5). A one-way valve is installed at the connection between the tail gas pipe (11) and the tail gas treatment box (5). The distillation waste gas is discharged into the tail gas treatment box (5) through the tail gas pipe (11).

7. The pesticide synthesis vacuum distillation apparatus according to claim 1, characterized in that: A washing chamber, an adsorption chamber and a combustion chamber are installed inside the tail gas treatment box (5). The acidic or alkaline components in the tail gas are removed by washing. The harmful components are adsorbed by activated carbon in the adsorption chamber. The harmful gases in the combustion chamber are burned and decomposed into harmless gases.

8. The pesticide synthesis vacuum distillation apparatus according to claim 1, characterized in that: A controller (3) is provided on the front side of the heating base (2). The controller (3) is electrically connected to the heating element inside the heating base (2). The controller (3) controls the heat output of the heating base (2).

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