Crude parachlorobenzene product centrifugal drying system for preparing parachlorophenylglycine

Abstract

The utility model discloses a parachlorobenzene crude product centrifugal drying system for preparing parachlorobenzene glycine, which comprises a flash evaporation main machine, one side of the flash evaporation main machine is connected with a feeding device, the top of the feeding device is connected with the bottom of a centrifugal machine, and the other side of the flash evaporation main machine is connected with a heating device through a pipeline. A mixing shell and an air feeder are sequentially arranged on the side, away from the flash evaporation main machine, of the heating device. The top of the flash main machine is connected with an inlet of the cyclone dryer through a pipeline, a p-chlorophenylglycine finished product outlet is formed in the bottom of the cyclone dryer, the top of the cyclone dryer is connected with the bag-type dust collector through a pipeline, an induced draft fan is installed at a gas outlet of the bag-type dust collector, and a backflow pipe is arranged between an outlet of the induced draft fan and the mixing shell. And a dehumidification module is mounted on the return pipe. According to the centrifugal drying system for the parachloroacetic acid crude product, heat in waste steam can be reused, it is ensured that the flash evaporation temperature is maintained within a certain range, and consumption of drying heat is reduced.

Description

Technical Field

[0001] The utility model relates to a para-chloro crude product centrifugal drying system for preparing para-chlorophenylglycine, and belongs to the technical field of preparing para-chlorophenylglycine. Background Art

[0002] Chlorfenapyr, also known as chlorfenapyr, is a new type of pyrrole compound that acts on the mitochondria of cells in insects and acts through the multifunctional oxidase in insects, mainly inhibiting the conversion of adenosine diphosphate (ADP) to adenosine triphosphate (ATP). Adenosine triphosphate stores the energy necessary for cells to maintain their life functions. The drug has stomach poison and contact killing effects.

[0003] The intermediate p-chlorophenylglycine is required in the synthesis process of chlorfenapyr, and the crude p-chlorophenylglycine needs to be dried into a finished product through a centrifugal drying system. The centrifugal drying system in the prior art has the following technical problems during use:

[0004] 1. Flash drying is used to flash the material. A large amount of flash waste steam is generated during the flash drying process. The heat in the waste steam is not utilized and is directly discharged into the air, resulting in a serious waste of heat.

[0005] 2. During the use of the flash drying device, the temperature of the inner cavity is sometimes too high, which not only leads to a decline in product quality, but also causes heat waste and economic losses to the production company.

[0006] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0007] In view of the deficiencies in the background technology, the utility model provides a para-chloro crude product centrifugal drying system for preparing para-chlorophenylglycine, which can reuse the heat in the waste steam, ensure that the flash temperature is maintained within a certain range, and reduce the consumption of drying heat.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0009] A para-chloro crude product centrifugal drying system for preparing para-chlorophenylglycine comprises a flash evaporation main unit, one side of the flash evaporation main unit is connected to a feeding device, the top of the feeding device is connected to the bottom of a centrifuge, the other side of the flash evaporation main unit is connected to a heating device through a pipeline, and a mixing shell and a blower are sequentially arranged on the side of the heating device away from the flash evaporation main unit;

[0010] The top of the flash main unit is connected to the inlet of the cyclone dryer through a pipeline, the bottom of the cyclone dryer is provided with a finished product outlet of p-chlorophenylglycine, the top of the cyclone dryer is connected to the bag dust collector through a pipeline, an induced draft fan is installed at the gas outlet of the bag dust collector, a return pipe is provided between the outlet of the induced draft fan and the mixing shell, and a dehumidification module is installed on the return pipe.

[0011] Furthermore, the feeding device is internally provided with a crushing shaft and a screw feeding shaft which are arranged up and down, and the crushing shaft and the screw feeding shaft are chain-driven by the same motor.

[0012] Furthermore, the pipeline between the flash evaporator main unit and the heating device is arranged along the tangent direction of the inner cavity of the flash evaporator main unit.

[0013] Furthermore, a stirring device is installed at the bottom of the inner cavity of the heating device, and the stirring device is used to evenly mix and contact the feed with the hot air.

[0014] Furthermore, the heating device comprises an upper oil chamber and a lower oil chamber which are symmetrically arranged, and a plurality of chambers are arranged inside the upper oil chamber and the lower oil chamber, and the chambers of the upper oil chamber and the lower oil chamber are arranged correspondingly in the vertical direction.

[0015] Furthermore, a plurality of groups of heating tubes are provided between the upper oil chamber and the lower oil chamber, and both ends of each group of heating tubes are respectively connected to the chambers in the upper oil chamber and the lower oil chamber.

[0016] Furthermore, the multiple chambers in the upper oil chamber are connected to the heat transfer oil return pipe through branch pipes; the multiple chambers in the lower oil chamber are connected to the heat transfer oil inlet pipe through branch pipes, and electromagnetic on-off valves are installed on the branch pipes.

[0017] Furthermore, a temperature sensor is installed in the inner cavity of the flash evaporation main unit, and the temperature sensor and the electromagnetic on-off valve are both connected to the PLC control module.

[0018] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0019] In the utility model, the flash exhaust steam is dehumidified and then flows back into the mixing shell through the return pipe, and the waste heat of the exhaust steam is used to heat the air sent in by the blower, thereby reducing the heat consumption of the heat transfer oil and further reducing the waste of resources.

[0020] The utility model monitors the inner cavity temperature of the flash evaporator main unit in real time, controls the opening amount of the electromagnetic on-off valve, ensures that the inner cavity temperature of the flash evaporator main unit is maintained within 100° C.-105° C., and can also reduce the heat consumption of the heat transfer oil.

[0021] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the flash steam main engine and the feeding device in the utility model;

[0024] Figure 3 It is a structural schematic diagram of the heating device in the utility model.

[0025] In the figure, 1-centrifuge; 2-feeding device, 21-crushing shaft, 22-screw feeding shaft; 3-flash evaporation main unit, 31-stirring device; 4-air blower; 5-mixing shell; 6-heating device, 61-upper oil chamber, 62-lower oil chamber, 63-heating pipe, 64-heat oil inlet pipe, 65-electromagnetic on-off valve, 66-heat oil return pipe; 7-cyclone dryer; 8-bag dust collector; 9-induced draft fan; 10-return pipe; 11-dehumidification module. DETAILED DESCRIPTION

[0026] 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.

[0027] like Figure 1-Figure 3 As shown together, the utility model provides a para-chloro crude product centrifugal drying system for preparing para-chlorophenylglycine, including a flash evaporation main unit 3, one side of the flash evaporation main unit 3 is connected to a feeding device 2, the top of the feeding device 2 is connected to the bottom of a centrifuge 1, and the other side of the flash evaporation main unit 3 is connected to a heating device 6 through a pipeline, and a mixing shell 5 and a blower 4 are sequentially arranged on the side of the heating device 6 away from the flash evaporation main unit 3.

[0028] The top of the flash main unit 3 is connected to the inlet of the cyclone dryer 7 through a pipeline, the bottom of the cyclone dryer 7 is provided with a p-chlorophenylglycine finished product outlet, the top of the cyclone dryer 7 is connected to the bag filter 8 through a pipeline, the gas outlet of the bag filter 8 is provided with an induced draft fan 9, a return pipe 10 is provided between the outlet of the induced draft fan 9 and the mixing shell 5, and a dehumidification module 11 is installed on the return pipe 10. The dehumidification module 11 is used to dehumidify the flash exhaust gas, and the exhaust gas with a certain temperature after dehumidification is refluxed into the mixing shell 5.

[0029] The centrifuge 1 is used to centrifugally dry the crude p-chlorophenylglycine product, so that the moisture content of the wet filter cake obtained after drying is about 15-20%.

[0030] The feeding device 2 is internally provided with a crushing shaft 21 and a screw feeding shaft 22 arranged up and down, and the crushing shaft 21 and the screw feeding shaft 22 are chain-driven with the same motor, and the motor synchronously drives the rotation of the crushing shaft 21 and the screw feeding shaft 22. The crushing shaft 21 is used to crush the chlorophenylglycine wet filter cake, and after crushing, the crushed cake is fed into the inner cavity of the flash main unit 3 through the screw feeding shaft 22.

[0031] The pipeline between the flash evaporation main unit 3 and the heating device 6 is arranged along the tangent direction of the inner cavity of the flash evaporation main unit 3, and the heated gas enters the flash evaporation main unit 3 and swirls.

[0032] A stirring device 31 is installed at the bottom of the inner cavity of the heating device 6, and the stirring device 31 is used to mix and contact the feed with the hot gas evenly.

[0033] The heating device 6 heats the intake air by heat transfer oil. The heating device 6 includes an upper oil chamber 61 and a lower oil chamber 62 that are symmetrically arranged. The upper oil chamber 61 and the lower oil chamber 62 are each provided with a plurality of chambers, and the chambers of the upper oil chamber 61 and the lower oil chamber 62 are correspondingly arranged in the vertical direction. A plurality of groups of heating pipes 63 are provided between the upper oil chamber 61 and the lower oil chamber 62, and the two ends of each group of heating pipes 63 are respectively connected to the chambers in the upper oil chamber 61 and the lower oil chamber 62.

[0034] The multiple chambers in the upper oil chamber 61 are connected to the heat transfer oil return pipe 66 through branch pipes, and the multiple chambers in the lower oil chamber 62 are connected to the heat transfer oil inlet pipe 64 through branch pipes, and electromagnetic on-off valves 65 are installed on the branch pipes.

[0035] A temperature sensor is installed in the inner cavity of the flash main unit 3 , and the temperature sensor and the electromagnetic on-off valve 65 are both connected to the PLC control module.

[0036] By real-time monitoring of the inner cavity temperature of the flash evaporator main unit 3 and controlling the opening number of the electromagnetic on-off valve 65, the inner cavity temperature of the flash evaporator main unit 3 is ensured to be maintained at 100°C-105°C, avoiding the problem of excessive drying temperature and reducing the heat consumption of the heat transfer oil.

[0037] The specific working principle of this utility model:

[0038] The centrifuge 1 centrifuges and dries the crude p-chlorophenylglycine, and the moisture content of the wet cake after drying is about 15-20%; the wet cake is crushed and fed into the inner cavity of the flash evaporation main unit 3; at the same time, the heating device 6 heats the intake air, and after heating, the intake air enters the inner cavity of the flash evaporation main unit 3 and mixes with the material. The material is dried and separated during the flow process, and the separated dry p-chlorophenylglycine product can be directly put into the cyclization dropwise addition process for use.

[0039] In the utility model, the flash exhaust steam is dehumidified and then flows back into the mixing shell 5 through the return pipe 10, and the waste heat of the exhaust steam is used to heat the air sent by the blower 4, thereby reducing the heat consumption of the heat transfer oil and further reducing the waste of resources.

[0040] The utility model monitors the inner cavity temperature of the flash evaporator main unit 3 in real time and controls the opening amount of the electromagnetic on-off valve 65 to ensure that the inner cavity temperature of the flash evaporator main unit 3 is maintained within 100° C.-105° C., and can also reduce the heat consumption of the heat transfer oil.

[0041] 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 drying system for preparing p-chlorophenylglycine crude product, characterized in that: It comprises a flash evaporation main unit (3), one side of the flash evaporation main unit (3) is connected to a feeding device (2), the top of the feeding device (2) is connected to the bottom of a centrifuge (1), the other side of the flash evaporation main unit (3) is connected to a heating device (6) via a pipeline, and a mixing shell (5) and a blower (4) are sequentially arranged on the side of the heating device (6) away from the flash evaporation main unit (3); The top of the flash main unit (3) is connected to the inlet of the cyclone dryer (7) via a pipeline, the bottom of the cyclone dryer (7) is provided with an outlet for the finished p-chlorophenylglycine product, the top of the cyclone dryer (7) is connected to the bag filter (8) via a pipeline, an induced draft fan (9) is installed at the gas outlet of the bag filter (8), a return pipe (10) is provided between the outlet of the induced draft fan (9) and the mixing shell (5), and a dehumidification module (11) is installed on the return pipe (10).

2. The centrifugal drying system for preparing p-chlorophenylglycine according to claim 1, characterized in that: The feeding device (2) is internally provided with a crushing shaft (21) and a screw feeding shaft (22) arranged up and down, and the crushing shaft (21) and the screw feeding shaft (22) are chain-driven by the same motor.

3. The centrifugal drying system for preparing p-chlorophenylglycine according to claim 1, characterized in that: The pipeline between the flash evaporation main unit (3) and the heating device (6) is arranged along the tangent direction of the inner cavity of the flash evaporation main unit (3).

4. The centrifugal drying system for preparing p-chlorophenylglycine according to claim 1, characterized in that: A stirring device (31) is installed at the bottom of the inner cavity of the heating device (6), and the stirring device (31) mixes the feed material and the hot air evenly.

5. The centrifugal drying system for preparing p-chlorophenylglycine according to claim 1, characterized in that: The heating device (6) comprises an upper oil chamber (61) and a lower oil chamber (62) which are symmetrically arranged. A plurality of chambers are arranged inside the upper oil chamber (61) and the lower oil chamber (62). The chambers of the upper oil chamber (61) and the lower oil chamber (62) are arranged correspondingly in the vertical direction.

6. The centrifugal drying system for preparing p-chlorophenylglycine according to claim 5, characterized in that: A plurality of groups of heating tubes (63) are provided between the upper oil chamber (61) and the lower oil chamber (62), and two ends of each group of heating tubes (63) are respectively connected to the chambers in the upper oil chamber (61) and the lower oil chamber (62).

7. The centrifugal drying system for preparing p-chlorophenylglycine according to claim 6, characterized in that: The multiple chambers in the upper oil chamber (61) are connected to the heat transfer oil return pipe (66) through branch pipes; the multiple chambers in the lower oil chamber (62) are connected to the heat transfer oil inlet pipe (64) through branch pipes, and electromagnetic on-off valves (65) are installed on the branch pipes.

8. The centrifugal drying system for preparing p-chlorophenylglycine according to claim 7, characterized in that: A temperature sensor is installed in the inner cavity of the flash steam main unit (3), and the temperature sensor and the electromagnetic on-off valve (65) are both connected to the PLC control module.

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