Centrifugal mother liquor recovery treatment system for chlorfenapyr preparation

Abstract

The utility model discloses a centrifugal mother liquor recovery treatment system for chlorfenapyr preparation. The centrifugal mother liquor recovery treatment system comprises a recovery kettle, a condenser and a methanol recovery tank which are sequentially connected through a process pipeline, a heat exchange jacket is mounted outside a kettle body of the recovery kettle, a main shaft arranged in the vertical direction is mounted in the recovery kettle, and paddles are fixedly mounted at the bottom end of the main shaft; a heat exchange pipe is mounted in the recovery kettle and sleeves the outer part of a main body of the main shaft; an annular spray pipe capable of ascending and descending in the vertical direction is arranged outside a main body of the heat exchange pipe in a sleeving mode and connected with the bottom end of the liquid inlet pipe, and an inner cavity of the annular spray pipe communicates with the liquid inlet pipe. And the liquid inlet pipe is arranged in the sleeve at the top of the recovery kettle in a penetrating manner along the vertical direction. According to the mother liquor recovery treatment system provided by the utility model, the distillation efficiency of materials in the kettle is improved through the matching of the inner and outer heat exchange structures; attachments on the inner wall of the recovery kettle and elements in the kettle can be removed in time, and the situation that the recovery efficiency is affected due to scaling formed by the attachments is avoided.

Description

Technical Field

[0001] The utility model relates to a centrifugal mother liquor recovery and processing system for preparing chlorfenapyr, belonging to the technical field of mother liquor recovery. Background Art

[0002] Chlorfenapyr, also known as chlorfenapyr, is a white crystalline powder. It is a highly effective and low-toxic insecticide with both stomach poison and contact killing effects. During the preparation process of chlorfenapyr, the wet crude product needs to be centrifuged, and the wet fine product obtained by centrifugation is put into the airflow drying system for drying, and then packaged and stored. The mother liquor obtained by centrifugation needs to be put into the mother liquor recovery kettle for distillation to recover methanol.

[0003] During the stirring and evaporation process of the existing mother liquor recovery kettle, a large amount of colloidal substances will be produced due to the heating and evaporation of the materials. If they are not removed in time, they will adhere to the inner wall and components of the recovery kettle to form scale. After running for a period of time, it will cause difficulty in heating the equipment, seriously affecting the recovery efficiency and the service life of the equipment.

[0004] The existing mother liquor recovery kettle is provided with a heat exchange jacket on the outside, and the temperature of the material in the kettle is raised by the heat exchange jacket to achieve distillation. However, the heating principle of the heat exchange jacket is to heat slowly from the outside to the inside, which makes the distillation efficiency of the material in the kettle low.

[0005] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] The utility model aims at the deficiencies in the background technology and provides a centrifugal mother liquor recovery and processing system for preparing chlorfenapyr. The system can improve the distillation efficiency of the material in the kettle through the cooperation of two sets of internal and external heat exchange structures; the attachments on the inner wall of the recovery kettle and the components in the kettle can be removed in time to avoid the attachments from forming scale and affecting the recovery efficiency.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr comprises a recovery kettle, a condenser and a methanol recovery tank which are sequentially connected through process pipelines;

[0009] The recovery kettle is provided with a heat exchange jacket on the outside of the kettle body, and a main shaft arranged in a vertical direction is installed inside the recovery kettle, and a paddle is fixedly installed at the bottom end of the main shaft; a heat exchange tube is installed inside the recovery kettle, and the heat exchange tube jacket is arranged on the outside of the main body of the main shaft;

[0010] The heat exchange tube body is provided with an annular nozzle which can be lifted and lowered in the vertical direction. The annular nozzle is connected to the bottom end of the liquid inlet pipe and the inner cavity is communicated. The liquid inlet pipe is vertically inserted into the sleeve at the top of the recovery kettle.

[0011] Furthermore, a heat exchange medium inlet pipe A is provided at the bottom of the heat exchange jacket, and a heat exchange medium outlet pipe A is provided at the top of the heat exchange jacket.

[0012] Furthermore, the top end of the main shaft is connected to a motor outside the recovery kettle.

[0013] Furthermore, the top end of the heat exchange tube is connected to a heat exchange medium inlet tube B and a heat exchange medium outlet tube B.

[0014] Furthermore, the inner circle, outer circle, upper part of the tube wall and lower part of the tube wall of the annular nozzle are all equidistantly distributed with spray holes.

[0015] Furthermore, the sleeve is fixedly connected to the top of the recovery kettle, and a sliding seal with an annular structure is embedded in the upper end of the sleeve.

[0016] Furthermore, the annular nozzle and the liquid inlet pipe provide a power source for the lifting process through a telescopic rod.

[0017] Furthermore, the main body of the telescopic rod is fixedly connected to the top of the recovery kettle in the vertical direction, and the end of the extended end of the telescopic rod is fixedly connected to the pipe wall of the liquid inlet pipe through a bracket.

[0018] Furthermore, a discharge valve is provided at the bottom of the recovery kettle.

[0019] Furthermore, a gas outlet is provided on the top of the recovery kettle, and the gas outlet is connected to the condenser through a pipeline.

[0020] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0021] During the distillation process, the heat exchange jacket exchanges heat from the outside to the inside for the material in the recovery kettle, and the heat exchange tube exchanges heat from the inside to the outside for the material in the recovery kettle. The distillation efficiency of the material in the kettle is improved through the cooperation of the two sets of heat exchange structures inside and outside.

[0022] The telescopic rod can drive the annular nozzle and the liquid inlet pipe to move up and down in the vertical direction. The annular nozzle will wash the inner wall of the recovery kettle and the components inside the kettle with high pressure, remove the attachments in time, avoid the attachments from forming scale, make it difficult to heat the equipment, and affect the recovery efficiency.

[0023] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 It is a schematic diagram of the internal structure of the recovery kettle in the utility model;

[0026] Figure 3 yes Figure 2 A magnified view of the structure at center.

[0027] In the figure, 1-recovery kettle, 2-condenser, 3-methanol recovery tank, 4-heat exchange jacket, 5-heat exchange medium inlet pipe A, 6-heat exchange medium outlet pipe A, 7-main shaft, 8-blade, 9-heat exchange tube, 10-heat exchange medium inlet pipe B, 11-heat exchange medium outlet pipe B, 12-annular nozzle, 13-spray hole, 14-liquid inlet pipe, 15-casing, 16-sliding seal, 17-bracket, 18-telescopic rod, 19-discharge valve, 20-air outlet. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0029] like Figure 1-Figure 3 As shown together, the utility model provides a centrifugal mother liquor recovery and processing system for preparing chlorfenapyr, comprising a recovery kettle 1, a condenser 2 and a methanol recovery tank 3 which are sequentially connected through process pipelines. The recovery kettle 1 distills the centrifugal mother liquor, and the methanol produced by the distillation is condensed by the condenser 2 and then enters the methanol recovery tank 3.

[0030] A heat exchange jacket 4 is installed outside the recovery kettle 1, a heat exchange medium inlet pipe A5 is provided at the bottom of the heat exchange jacket 4, and a heat exchange medium outlet pipe A6 is provided at the top of the heat exchange jacket 4. The heat exchange jacket 4 exchanges heat with the material in the recovery kettle 1 from outside to inside.

[0031] A main shaft 7 arranged in a vertical direction is installed inside the recovery kettle 1 , a paddle 8 is fixedly installed at the bottom end of the main shaft 7 , and the top end of the main shaft 7 is connected to a motor outside the recovery kettle 1 .

[0032] The recovery kettle 1 is provided with a heat exchange tube 9, which is sleeved on the main body of the main shaft 7. The top of the heat exchange tube 9 is connected to the heat exchange medium inlet tube B10 and the heat exchange medium outlet tube B11. The heat exchange medium enters the heat exchange tube 9 from the heat exchange medium inlet tube B10 to fully exchange heat with the material in the recovery kettle 1. After the heat exchange is completed, the medium returns to the heat exchange medium outlet tube B11. The heat exchange tube 9 exchanges heat with the material in the recovery kettle 1 from the inside to the outside.

[0033] The main body of the heat exchange tube 9 is provided with an annular nozzle 12 which can be raised and lowered in the vertical direction. The inner circle, outer circle, upper part and lower part of the annular nozzle 12 are provided with spray holes 13 which are evenly distributed.

[0034] The annular nozzle 12 is connected to the bottom end of the liquid inlet pipe 14, and the inner cavities are connected; the liquid inlet pipe 14 is vertically penetrated into the sleeve 15 at the top of the recovery kettle 1, the sleeve 15 is fixed to the top of the recovery kettle 1, and the upper end of the sleeve 15 is embedded with a sliding seal 16 of an annular structure to ensure good sliding sealing performance between the liquid inlet pipe 14 and the sleeve 15.

[0035] The annular nozzle 12 and the liquid inlet pipe 14 provide a power source for the lifting process through a telescopic rod 18, and the telescopic rod 18 is an electric telescopic rod.

[0036] The main body of the telescopic rod 18 is fixedly connected to the top of the recovery kettle 1 in the vertical direction, and the end of the extended end of the telescopic rod 18 is fixedly connected to the wall of the liquid inlet pipe 14 through the bracket 17. The telescopic rod 18 drives the annular nozzle 12 and the liquid inlet pipe 14 to move up and down during the reciprocating telescopic process.

[0037] The bottom of the recovery kettle 1 is provided with a discharge valve 19, which is used to discharge the distillation residue. The top of the recovery kettle 1 is provided with an air outlet 20, which is connected to the condenser 2 through a pipeline.

[0038] The specific working principle of this utility model:

[0039] The centrifuged mother liquor enters the recovery kettle 1 for distillation, and the temperature in the kettle is controlled at 68-70°C. The methanol produced by the distillation is condensed by the condenser 2 and enters the methanol recovery tank 3. The distillation residue is discharged from the discharge valve 19 and sent to the hazardous waste storage.

[0040] During the distillation process, the heat exchange jacket 4 exchanges heat from the outside to the inside for the material in the recovery kettle 1, and the heat exchange tube 9 exchanges heat from the inside to the outside for the material in the recovery kettle 1. Through the cooperation of the two sets of internal and external heat exchange structures, the distillation efficiency of the material in the kettle is improved, and the distillation temperature is maintained between 68-70°C.

[0041] After the distillation is completed, the telescopic rod 18 drives the annular nozzle 12 and the liquid inlet pipe 14 to move up and down in the vertical direction. At the same time, the cleaning liquid enters the annular nozzle 12 from the liquid inlet pipe 14, and is sprayed at high pressure through the spray holes 13 around the pipe wall, so as to wash the inner wall of the recovery kettle 1 and the components inside the recovery kettle 1 with high pressure, and remove the attachments in time to avoid scaling of the attachments, which will make it difficult to heat the equipment and affect the recovery efficiency.

[0042] The above is an example of the best implementation of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr, characterized in that: It comprises a recovery kettle (1), a condenser (2) and a methanol recovery tank (3) which are connected in sequence through a process pipeline; A heat exchange jacket (4) is installed on the outside of the recovery kettle (1), a main shaft (7) arranged in a vertical direction is installed inside the recovery kettle (1), and a paddle (8) is fixedly installed at the bottom end of the main shaft (7); a heat exchange tube (9) is installed inside the recovery kettle (1), and the heat exchange tube (9) is sleeved on the outside of the main body of the main shaft (7); An annular nozzle (12) that can be raised and lowered in a vertical direction is sleeved on the exterior of the main body of the heat exchange tube (9); the annular nozzle (12) is connected to the bottom end of a liquid inlet pipe (14), and the inner cavities are communicated with each other; the liquid inlet pipe (14) is vertically inserted into a sleeve (15) at the top of the recovery kettle (1).

2. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 1, characterized in that: A heat exchange medium inlet pipe A (5) is provided at the bottom of the heat exchange jacket (4), and a heat exchange medium outlet pipe A (6) is provided at the top of the heat exchange jacket (4).

3. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 1, characterized in that: The top end of the main shaft (7) is connected to a motor outside the recovery kettle (1).

4. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 1, characterized in that: The top end of the heat exchange tube (9) is connected to a heat exchange medium inlet pipe B (10) and a heat exchange medium outlet pipe B (11).

5. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 1, characterized in that: The inner circle, the outer circle, the upper part of the tube wall and the lower part of the tube wall of the annular nozzle (12) are provided with spray holes (13) distributed at equal intervals.

6. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 1, characterized in that: The sleeve (15) is fixedly connected to the top of the recovery kettle (1), and a sliding seal (16) with an annular structure is embedded in the upper end of the sleeve (15).

7. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 1, characterized in that: The annular nozzle (12) and the liquid inlet pipe (14) provide a power source for the lifting process via a telescopic rod (18).

8. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 7, characterized in that: The main body of the telescopic rod (18) is fixedly connected to the top of the recovery kettle (1) in the vertical direction, and the end of the extended end of the telescopic rod (18) is fixedly connected to the wall of the liquid inlet pipe (14) through a bracket (17).

9. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 1, characterized in that: A discharge valve (19) is provided at the bottom of the recovery kettle (1).

10. The centrifugal mother liquor recovery and treatment system for preparing chlorfenapyr according to claim 9, characterized in that: The top of the recovery kettle (1) is provided with an air outlet (20), and the air outlet (20) is connected to the condenser (2) through a pipeline.

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