Distillation and purification device for pesticide precursor production

Abstract

The utility model discloses a distillation and purification device for pesticide precursor production, which relates to the technical field of distillation and purification and comprises a distillation kettle, a circular cover body is arranged at the top end of the distillation kettle, a heating component sleeved on the outer side of the distillation kettle is fixedly connected to the bottom end of the circular cover body, and a mixing component is arranged in the middle of the top end of the circular cover body in a penetrating manner. A vacuum pump penetrates through one side of the top end of the circular cover body, a condensation assembly penetrates through the other side of the top end of the circular cover body, a mother liquor recovery tank is arranged at the bottom end of the condensation assembly, a water injection port penetrates through one side of the mother liquor recovery tank, a backflow assembly penetrates through the bottom end of the mother liquor recovery tank, and a material transferring pipe is arranged at one end of the backflow assembly. One end of the material transfer pipe penetrates through the heating assembly and is connected with the distillation kettle. The dichloroethane distillation kettle is reasonable and reliable in structure, the heat exchange area is greatly increased through the double-layer jacket design, the uniform distribution of the temperature in the distillation kettle is ensured, and the distillation effect of dichloroethane and low-boiling-point organic matters is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation purification, in particular to a distillation purification device for producing pesticide precursors. Background Art

[0002] With the rapid development of agricultural production, pesticides play a vital role in ensuring food security and combating pests and diseases. They not only improve crop yield and quality, but also effectively control the occurrence of various pests and diseases, providing a crucial guarantee for agricultural production. However, the production process of pesticides produces a large number of hazardous substances, such as ethylene dichloride, triethylamine, and methyl anthranilate. These substances cause serious environmental pollution and pose potential risks to human health. This is particularly true during the production of pesticide precursors, such as sulfonamides, where emissions of these hazardous substances are particularly significant.

[0003] As an important pesticide intermediate, sulfonamide's production process involves complex chemical reactions and multi-step purification processes, with distillation being a key step. Traditional pesticide production primarily relies on distillation units, which separate and purify organic solvents like ethylene dichloride. While these traditional devices meet production needs to a certain extent, they still have numerous deficiencies in practical application and urgently need improvement to enhance production efficiency and environmental performance.

[0004] For example, Chinese patent CN220824483U discloses a waste ethylene glycol purification distillation apparatus, comprising a support mechanism, a distillation mechanism fixedly connected to one side of the top of the support mechanism, and a filtering mechanism fixedly connected to the bottom of the distillation mechanism. This apparatus solves the problem of difficulty in discharging filtered impurities during material filtration, which can lead to a deterioration in the purification effect if impurities are not discharged for a long time. However, the above-mentioned distillation apparatus has the following deficiencies in actual use: First, the apparatus uses a heating plate for heating, which has low heat exchange efficiency and may lead to uneven temperature distribution in the still, affecting the separation of dichloroethane and low-boiling organic matter, resulting in poor distillation effect; furthermore, the apparatus lacks an effective reflux mechanism, resulting in a low recovery rate of volatile substances, and the secondary distillation process is insufficient, failing to maximize the separation of dichloroethane, increasing the amount of waste liquid to be processed, and placing an unnecessary burden on the environment.

[0005] Currently, no effective solutions have been proposed for the problems in related technologies. Utility Model Content

[0006] (1) Technical problems solved

[0007] In response to the deficiencies of the prior art, the utility model provides a distillation and purification device for the production of pesticide precursors. The device has the advantages of greatly increasing the heat exchange area by utilizing a double-layer jacket design, ensuring uniform temperature distribution in the distillation kettle, and realizing secondary distillation through reflux, thereby improving the distillation effect of dichloroethane and low-boiling-point organic matter. This solves the problems in the prior art of low heat exchange efficiency, which may lead to uneven temperature distribution in the distillation kettle and affect the distillation effect, as well as the lack of an effective reflux mechanism, resulting in a low recovery rate of volatile substances, and insufficient secondary distillation process, which fails to achieve maximum separation.

[0008] (2) Technical solution

[0009] In order to achieve the above advantages of utilizing a double-layer jacket design to significantly increase the heat exchange area, ensure uniform temperature distribution in the still, and realize secondary distillation through reflux, thereby improving the distillation effect of dichloroethane and low-boiling-point organic matter, the specific technical solutions adopted by the utility model are as follows:

[0010] A distillation and purification device for producing pesticide precursors includes a distillation kettle, a circular cover body is provided at the top of the distillation kettle, a heating component sleeved on the outside of the distillation kettle is fixedly connected to the bottom of the circular cover body, a mixing component is provided through the middle of the top of the circular cover body, a vacuum pump is provided through one side of the top of the circular cover body, a condensation component is provided through the other side of the top of the circular cover body, a mother liquor recovery tank is provided at the bottom of the condensation component, a water injection port is provided through one side of the mother liquor recovery tank, a reflux component is provided through the bottom of the mother liquor recovery tank, a material transfer pipe is provided at one end of the reflux component, and one end of the material transfer pipe passes through the heating component and is connected to the distillation kettle.

[0011] Furthermore, in order to increase the heat exchange area through the double-layer jacket design, ensure uniform temperature distribution of the distillation kettle, and improve the distillation effect of dichloroethane and low-boiling point organic matter, the heating component includes a cylindrical jacket arranged at the bottom end of the circular cover body, a conical jacket is arranged at the bottom end of the cylindrical jacket, a conical sleeve is arranged on the inner side of the conical jacket and is sleeved on the outer side of the bottom of the distillation kettle, a cylindrical sleeve is arranged on the inner side of the cylindrical jacket and is sleeved on the outer side of the middle part of the distillation kettle, and the top end of the conical sleeve is connected to the bottom end of the cylindrical sleeve by a connecting pipe.

[0012] Furthermore, in order to achieve multi-layer stirring, prevent sulfonamide from depositing at the bottom, ensure uniform dispersion of the oil phase, and prevent local enrichment, which affects the distillation effect, the mixing assembly includes a driving motor arranged in the middle of the top of the circular cover body, and the output end of the driving motor is provided with a rotating rod through the middle of the circular cover body, and a plurality of connecting arms are provided on the outer side of the middle of the rotating rod, and a plurality of C-shaped blades are provided at one end of the connecting arm, and a spiral blade is provided on the outer side of the bottom of the rotating rod.

[0013] Furthermore, in order to ensure that the steam generated during the distillation process can be effectively condensed and recovered, the condensation component includes an inlet pipe arranged on one side of the top of the circular cover body, a condensation shell is provided at one end of the inlet pipe, an outlet pipe is provided at one end of the condensation shell, a first water pump is provided at one end of the outlet pipe, and the first water pump is connected to the mother liquor recovery tank through a pipeline; a plurality of condensation tube bundles are provided through the inner side of the condensation shell, a plurality of support plates are provided on the outer side of the middle part of the condensation tube bundle, a medium discharge cavity is provided at the top end of the condensation tube bundle, and a medium input cavity is provided at the bottom end of the condensation tube bundle.

[0014] Furthermore, in order to improve the distillation efficiency, maximize the separation of dichloroethane through secondary distillation, and reduce the amount of waste liquid that ultimately needs to be treated, the reflux component includes an L-shaped tube arranged at the bottom end of the mother liquor recovery tank, a second water pump is provided at one end of the L-shaped tube, a three-way valve is provided on one side of the second water pump, a feed pipe is provided on one side of the three-way valve, and the other side of the three-way valve is connected to the transfer pipe through a return pipe.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention provides a distillation and purification device for the production of pesticide precursors, which has the following beneficial effects:

[0017] (1) The utility model has a reasonable and reliable structure. Through the combination of the outer cylindrical jacket and the conical jacket, and the inner cylindrical sleeve and the conical sleeve, the heat exchange area is greatly increased, ensuring the uniform distribution of temperature in the distillation kettle, thereby significantly improving the distillation effect of dichloroethane and low-boiling-point organic matter; at the same time, the multi-level stirring blade design effectively prevents the sulfonamide from being deposited at the bottom, ensuring the uniform dispersion of the oil phase; after the negative pressure distillation of sulfonamide is completed, the condensation component and the reflux component can add soft water through the water injection port to obtain mother liquid water to dilute the material, and then return it to the distillation kettle for distillation for the second time through the reflux component, so as to maximize the separation of dichloroethane, which not only improves the product purity and yield, but also reduces the amount of waste liquid treatment, making the entire production process more environmentally friendly and efficient.

[0018] (2) By setting up a heating component and a mixing component, a double-layer jacket structure is realized to heat the distillation kettle. The outer layer is composed of a cylindrical jacket and a conical jacket, and the inner layer is composed of a cylindrical sleeve and a conical sleeve, which increases the heat exchange area, ensures uniform temperature distribution of the distillation kettle, and improves the distillation effect of dichloroethane and low-boiling point organic matter; at the same time, the stirring blades realize multi-layer stirring, prevent sulfonamide from depositing at the bottom, ensure uniform dispersion of the oil phase, and prevent local enrichment from affecting the distillation effect.

[0019] (3) By setting up a condensation component and a reflux component, the vapor of low-boiling-point organic matter and volatile substances such as dichloroethane generated by distillation in the still is condensed into liquid, and is pumped to the mother liquor recovery tank by a first water pump, mixed with soft water and used for dilution of the next batch of materials; in addition, after the sulfonamide negative pressure distillation is completed, soft water is added to the mother liquor recovery tank through the water injection port to obtain mother liquor water diluted material, which is sent back to the still for secondary distillation through the reflux component. The secondary distillation can maximize the separation of dichloroethane, reduce the amount of waste liquid that needs to be treated, and achieve more efficient and environmentally friendly industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a distillation and purification device for producing a pesticide precursor according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram from another angle of the distillation purification device for producing pesticide precursors according to an embodiment of the present utility model;

[0023] Figure 3 This is a partial structural diagram of a heating component in a distillation purification device for producing a pesticide precursor according to an embodiment of the present utility model;

[0024] Figure 4 This is a partial structural schematic diagram of a heating component in a distillation purification device for producing a pesticide precursor according to an embodiment of the present utility model from another angle;

[0025] Figure 5 This is a partial structural diagram of a condensation component in a distillation and purification device for producing a pesticide precursor according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic structural diagram of a mixing assembly in a distillation and purification device for producing a pesticide precursor according to an embodiment of the present utility model;

[0027] Figure 7 This is a partial structural diagram of a mixing assembly in a distillation and purification device for producing a pesticide precursor according to an embodiment of the present utility model;

[0028] Figure 8 yes Figure 1 A partial enlarged view of point A in the middle.

[0029] In the picture:

[0030] 1. Distillation kettle; 2. Round cover; 3. Heating assembly; 301. Cylindrical jacket; 302. Conical jacket; 303. Conical sleeve; 304. Cylindrical sleeve; 305. Connecting pipe; 4. Mixing assembly; 401. Driving motor; 402. Rotating rod; 403. Connecting arm; 404. C-shaped blade; 405. Spiral blade; 5. Vacuum pump; 6. Condensation assembly; 601. Inlet pipe; 602. Condensation shell; 603. Outlet pipe; 604. First water pump; 605. Condensation tube bundle; 606. Support plate; 607. Medium discharge chamber; 608. Medium input chamber; 7. Mother liquor recovery tank; 8. Water injection port; 9. Reflux assembly; 901. L-shaped pipe; 902. Second water pump; 903. Three-way valve; 904. Return pipe; 905. Feed pipe; 10. Transfer pipe. DETAILED DESCRIPTION

[0031] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] According to an embodiment of the present utility model, a distillation and purification device for producing pesticide precursors is provided.

[0033] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figures 1-8As shown, the distillation and purification device for producing pesticide precursors according to the embodiment of the present invention includes a distillation kettle 1 (in addition, in specific applications, a feed valve is provided on one side of the top of the distillation kettle 1 through a circular cover body 2, and a discharge valve is provided on the bottom of the distillation kettle 1 through a conical jacket 302). The top of the distillation kettle 1 is provided with a circular cover body 2, the bottom end of the circular cover body 2 is fixedly connected to a heating component 3 sleeved on the outside of the distillation kettle 1, a mixing component 4 is provided through the middle of the top of the circular cover body 2, a vacuum pump 5 is provided through one side of the top of the circular cover body 2, and a discharge valve is provided through the other side of the top of the circular cover body 2. A condensation component 6 is provided, and a mother liquor recovery tank 7 is provided at the bottom end of the condensation component 6 (in addition, in specific applications, a control panel is provided on one side of the mother liquor recovery tank 7, and the drive motor 401, the vacuum pump 5, the first water pump 604 and the second water pump 902 are electrically connected in sequence through the control panel. This is the existing technology and will not be elaborated on here). A water injection port 8 is provided through one side of the mother liquor recovery tank 7, and a reflux component 9 is provided through the bottom end of the mother liquor recovery tank 7. A transfer pipe 10 is provided at one end of the reflux component 9, and one end of the transfer pipe 10 passes through the heating component 3 and is connected to the distillation kettle 1.

[0034] With the aid of the above-mentioned technical solution of the present invention, the structure of the present invention is reasonable and reliable. The heat exchange area is greatly increased by the heating component 3, ensuring the uniform distribution of temperature in the distillation kettle 1, thereby significantly improving the distillation effect of dichloroethane and low-boiling-point organic matter; at the same time, the multi-layered stirring blade design of the mixing component 4 effectively prevents the sulfonamide from being deposited at the bottom, ensuring the uniform dispersion of the oil phase; after the negative pressure distillation of sulfonamide is completed, the condensation component 6 and the reflux component 9 can add soft water through the water injection port 8 to obtain mother liquid water to dilute the material, and return it to the distillation kettle 1 for distillation for the second time through the reflux component 9, thereby maximizing the separation of dichloroethane, not only improving the product purity and yield, but also reducing the amount of waste liquid treatment, making the entire production process more environmentally friendly and efficient.

[0035] In one embodiment, for the heating component 3, the heating component 3 includes a cylindrical jacket 301 fixedly arranged at the bottom end of the circular cover body 2, a conical jacket 302 is arranged at the bottom end of the cylindrical jacket 301, and a conical sleeve 303 is arranged on the inner side of the conical jacket 302 and is sleeved on the outside of the bottom of the distillation kettle 1 (in addition, in specific applications, one end of the conical sleeve 303 is provided with an inlet valve, which is connected to an external hot water circulation pump), and a cylindrical sleeve 304 is arranged on the inner side of the cylindrical jacket 301 and is sleeved on the outside of the middle part of the distillation kettle 1 (in addition, in specific applications, one end of the cylindrical sleeve 304 is provided with an outlet valve, which is connected to an external hot water circulation pump), and the top end of the conical sleeve 303 is connected to the bottom end of the cylindrical sleeve 304 by a connecting pipe 305, thereby achieving an increase in the heat exchange area through the double-layer jacket design, ensuring uniform temperature distribution of the distillation kettle 1, and improving the distillation effect of dichloroethane and low-boiling-point organic matter.

[0036] The working principle of the heating assembly 3 is as follows: the heating assembly 3 has a double-layer jacket structure, the outer layer is composed of a cylindrical jacket 301 and a conical jacket 302, and the inner layer is composed of a cylindrical sleeve 304 and a conical sleeve 303, and a closed-loop heat exchange is formed through a connecting pipe 305; wherein, the upper cylindrical region (cylindrical jacket 301 and cylindrical sleeve 304) is used to maintain the temperature in the middle of the still 1, providing a stable temperature environment for the conversion of dichloroethane and low-boiling point organic matter into the gas phase, and the lower conical region (conical jacket 302 and conical sleeve 303) is used to provide the main heating function. When hot water enters from the conical jacket 302, it can provide a large temperature difference driving force. The coil design ensures that the still 1 is heated evenly. The hot water continuously releases heat to the still 1 during the rising process. The heat forms natural convection in the still 1, which is conducive to uniform heat distribution and prevents local overheating, thereby fully vaporizing the oil phase at the bottom of the still 1 to obtain the crude sulfonamide.

[0037] In one embodiment, for the mixing assembly 4, the mixing assembly 4 includes a driving motor 401 arranged in the middle of the top of the circular cover body 2 (in addition, in specific applications, the driving motor 401 is set as a servo motor), the output end of the driving motor 401 passes through the middle of the circular cover body 2 and is provided with a rotating rod 402 (in addition, in specific applications, a mounting frame is provided at the bottom end of the distillation kettle 1, and the rotating rod 402 is connected to the mounting frame through a bearing), a plurality of connecting arms 403 are fixedly provided on the outer side of the middle part of the rotating rod 402, a plurality of C-shaped blades 404 are fixedly provided on one end of the connecting arm 403, and a spiral blade 405 is provided on the outer side of the bottom of the rotating rod 402, thereby realizing multi-layer stirring, preventing sulfonamide from depositing at the bottom, ensuring uniform dispersion of the oil phase, and preventing local enrichment, which affects the distillation effect.

[0038] The working principle of the mixing assembly 4 is as follows: a driving motor 401 is provided on the top of the distillation kettle 1, which can transmit power through a rotating rod 402. The rotating rod 402 is a multi-layer stirring structure. When the rotating rod 402 rotates, the upper C-shaped blade 404 is driven to rotate through the connecting arm 403, and the lower spiral blade 405 is driven to rotate at the same time. The C-shaped blade 404 can provide lateral stirring force, and the spiral blade 405 can generate axial conveying force to promote the circulation of materials, prevent sulfonamide from depositing at the bottom, ensure uniform dispersion of the oil phase, prevent local enrichment, and affect the distillation effect; and accelerate the mixing of soft water and materials through stirring during the secondary distillation to improve the dissolution efficiency.

[0039] In one embodiment, for the condensation component 6, the condensation component 6 includes an inlet pipe 601 arranged on one side of the top of the circular cover body 2, a condensation shell 602 is provided at one end of the inlet pipe 601, an outlet pipe 603 is provided at one end of the condensation shell 602, a first water pump 604 is provided at one end of the outlet pipe 603, and the first water pump 604 is connected to the mother liquor recovery tank 7 through a pipeline; a plurality of condensation tube bundles 605 are provided through the inner side of the condensation shell 602, a plurality of support plates 606 are provided on the outer side of the middle part of the condensation tube bundle 605, a medium discharge cavity 607 is provided at the top end of the condensation tube bundle 605 (in addition, in specific applications, a drain port is provided at one end of the medium discharge cavity 607, which is connected to an external cooling water circulation pump), and a medium input cavity 608 is provided at the bottom end of the condensation tube bundle 605 (in addition, in specific applications, a water inlet is provided at one end of the medium input cavity 608, which is connected to an external cooling water circulation pump), thereby ensuring that the steam generated during the distillation process can be effectively condensed and recovered.

[0040] The operating principle of the condensation assembly 6 is as follows: during the negative pressure distillation process, low-boiling-point organic matter and volatile substances such as ethylene dichloride in the still 1 are heated and evaporated, entering the condensation shell 602. The condensation shell 602 provides a condensation space, allowing the vapor of the volatile substances to condense when cooled. The condensation tube bundle 605 increases the condensation area and improves the condensation efficiency. The first water pump 604 pumps the condensed volatile substance liquid to the mother liquor recovery tank 7. During this process, the medium discharge chamber 607 and the medium input chamber 608 are used to control the flow of the condensation medium (cooling water in this embodiment) to ensure an effective condensation process, thereby condensing the volatile substance vapor into a liquid state through the condensation assembly 6 for easy collection and recovery of these substances. The condensed low-boiling-point organic matter and ethylene dichloride are temporarily stored in the mother liquor recovery tank 7. These substances can be recovered or reused through subsequent processing steps and mixed with soft water for dilution of the next batch of materials, thereby improving raw material utilization and reducing waste generation.

[0041] In one embodiment, the reflux assembly 9 includes an L-shaped tube 901 disposed at the bottom end of the mother liquid recovery tank 7, a second water pump 902 is disposed at one end of the L-shaped tube 901, a three-way valve 903 is disposed on one side of the second water pump 902, a feed pipe 905 is disposed on one side of the three-way valve 903, and the other side of the three-way valve 903 is connected to the transfer pipe 10 through a return pipe 904, thereby achieving

[0042] The working principle of the reflux component 9 is as follows: the reflux component 9 realizes the reflux of liquid from the mother liquor recovery tank 7 to the distillation kettle 1 through components such as the L-shaped tube 901, the second water pump 902, the three-way valve 903, the return pipe 904 and the transfer pipe 10. By adjusting the three-way valve 903 to connect the L-shaped tube 901 and the return pipe 904 and starting the second water pump 902, part of the condensed liquid in the mother liquor recovery tank 7 can be pumped back to the distillation kettle 1 through the transfer pipe 10 for further distillation to improve the separation efficiency. By heating and distilling the mother liquor still containing the sulfonamide component again, the extraction rate and purity of the sulfonamide component can be improved. After the secondary distillation is completed, by adjusting the three-way valve 903 to connect the L-shaped tube 901 and the feed pipe 905 and starting the second water pump 902, the waste can be discharged, thereby maximizing the separation of dichloroethane through the secondary distillation, reducing the amount of waste liquid that needs to be treated, and achieving more efficient and environmentally friendly industrial production.

[0043] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process is described in detail below.

[0044] In actual application, first open the feed valve on one side of the top of the distillation kettle 1, transfer the lower oil phase after hydrolysis and water washing in the previous process into the distillation kettle 1, then connect the hot water circulation pump to the heating component 3, and introduce hot water into the sleeve in the jacket of the heating component 3, and the hot water temperature is controlled at about 85°C; turn on the vacuum pump 5 to make the vacuum degree in the distillation kettle 1 reach 0.085-0.095Mpa, and perform negative pressure distillation. The distillation time is 4h / batch. When the material in the kettle becomes sandy, the distillation is terminated. The low-boiling point organic matter and dichloroethane distilled out are condensed by the condensation component 6 and temporarily stored in the mother liquor recovery tank 7; after the negative pressure distillation of dichloroethane is completed, soft water is added to the mother liquor recovery tank 7 through the water injection port 8. The mother liquor is then diluted with water and transferred to the still 1 via the reflux assembly 9 and transfer pipe 10. The still 1 is kept in a flowing state. Hot water is introduced into the jacket of the heating assembly 3 and stirred for 30 minutes, with the hot water temperature controlled at 25-30°C. After stirring, the temperature is maintained and raised to approximately 60°C. The vacuum pump 5 is then turned on to raise the vacuum level in the still to 0.085-0.095 MPa. Negative pressure distillation is then performed to remove water and low-boiling organic matter. The mother liquor is then condensed in the condensation assembly 6 and pumped into the mother liquor recovery tank 7 for reuse in the dilution of the next batch of material. Distillation is stopped when no fraction is distilled out of the still 1. The distillation time is 2 hours per batch. After distillation, the heating assembly 3 is turned off, the hot water is drained, and cold water is introduced to cool the still 1. The crude sulfonamide product is then obtained by metering soft water into the jacket and stirring to dissolve the product, resulting in a sulfonamide feed solution. The bottom discharge valve of the still 1 is opened to pass the sulfonamide feed solution into the next step.

[0045] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A distillation and purification device for producing pesticide precursors, comprising a distillation kettle (1), characterized in that: The top of the distillation kettle (1) is provided with a circular cover (2), the bottom end of the circular cover (2) is fixedly connected to a heating component (3) sleeved on the outside of the distillation kettle (1), a mixing component (4) is provided through the middle of the top of the circular cover (2), a vacuum pump (5) is provided through one side of the top of the circular cover (2), and a condensing component (6) is provided through the other side of the top of the circular cover (2).

2. The distillation and purification device for producing a pesticide precursor according to claim 1, characterized in that: A mother liquor recovery tank (7) is provided at the bottom end of the condensation component (6), a water injection port (8) is provided through one side of the mother liquor recovery tank (7), a reflux component (9) is provided through the bottom end of the mother liquor recovery tank (7), a transfer pipe (10) is provided at one end of the reflux component (9), and one end of the transfer pipe (10) passes through the heating component (3) and is connected to the distillation kettle (1).

3. The distillation and purification device for producing a pesticide precursor according to claim 2, characterized in that: The heating assembly (3) includes a cylindrical jacket (301) arranged at the bottom end of the circular cover (2), a conical jacket (302) is provided at the bottom end of the cylindrical jacket (301), a conical sleeve (303) is provided on the inner side of the conical jacket (302) and is sleeved on the outer side of the bottom of the distillation kettle (1), a cylindrical sleeve (304) is provided on the inner side of the cylindrical jacket (301) and is sleeved on the outer side of the middle part of the distillation kettle (1), and the top end of the conical sleeve (303) is connected to the bottom end of the cylindrical sleeve (304) via a connecting pipe (305).

4. The distillation and purification device for producing a pesticide precursor according to claim 2, characterized in that: The mixing assembly (4) comprises a driving motor (401) arranged in the middle of the top end of the circular cover (2); the output end of the driving motor (401) passes through the middle of the circular cover (2) and is provided with a rotating rod (402); a plurality of connecting arms (403) are provided on the outer side of the middle of the rotating rod (402); a plurality of C-shaped blades (404) are provided at one end of the connecting arm (403); and a spiral blade (405) is sleeved on the outer side of the bottom of the rotating rod (402).

5. The distillation and purification device for producing a pesticide precursor according to claim 4, characterized in that: The condensation component (6) includes an inlet pipe (601) arranged on one side of the top end of the circular cover (2), a condensation shell (602) is provided at one end of the inlet pipe (601), an outlet pipe (603) is provided at one end of the condensation shell (602), a first water pump (604) is provided at one end of the outlet pipe (603), and the first water pump (604) is connected to the mother liquor recovery tank (7) through a pipeline.

6. The distillation and purification device for producing a pesticide precursor according to claim 5, characterized in that: A plurality of condensation tube bundles (605) are provided through the inner side of the condensation shell (602), a plurality of support plates (606) are provided on the outer side of the middle part of the condensation tube bundle (605), a medium discharge cavity (607) is provided at the top end of the condensation tube bundle (605), and a medium input cavity (608) is provided at the bottom end of the condensation tube bundle (605).

7. The distillation and purification device for producing pesticide precursors according to claim 2, characterized in that: The reflux assembly (9) includes an L-shaped tube (901) arranged at the bottom end of the mother liquor recovery tank (7), a second water pump (902) is provided at one end of the L-shaped tube (901), a three-way valve (903) is provided on one side of the second water pump (902), a feed pipe (905) is provided on one side of the three-way valve (903), and the other side of the three-way valve (903) is connected to the transfer pipe (10) via a return pipe (904).

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