A reaction kettle with impurity removal function and a para-aminobenzoic acid impurity removal method

Abstract

The application relates to the technical field of reaction kettles, in particular to a reaction kettle with impurity removal function and a para-aminobenzoic acid impurity removal method. The reaction kettle comprises a reaction kettle and the like. Through solution circulation, insoluble impurities in the solution are filtered, thereby avoiding the need for additional filtering operation and reducing the complexity of impurity removal work; a small amount of crystals is washed each time, so that all the crystals can be washed, the situation that part of the crystals cannot be washed is avoided, the washing mode cannot additionally purchase a washing device, and therefore the production cost of an enterprise is saved; the crushing part crushes the extruded and caked crystals, so that the crystals are crushed into normal crystal size, subsequent crushing work is avoided, the workload of impurity removal treatment is reduced, and the production speed is accelerated; the pushing block pushes the crystals to move, so that the speed of the crystal discharge is accelerated, and the attached crystals can be pushed at the moment, so that the situation of blockage and the like is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of reaction kettles, in particular to a reaction kettle with impurity removal function and a p-aminophenylalanine impurity removal method. BACKGROUND

[0002] During the synthesis of p-aminophenylalanine, various impurities may be introduced, which affect the purity, stability and application performance of the product, so the p-aminophenylalanine needs to be impurity-removed to ensure that it meets the industry standards and customer requirements, and reasonable impurity removal methods and technologies can effectively remove the impurities and ensure the quality of the final product.

[0003] The dissolving agent and the p-aminophenylalanine are put into the reaction kettle for mixing and stirring, so that the impurities in the p-aminophenylalanine are dissolved in the solvent, and the p-aminophenylalanine and the dissolving agent are melted into a liquid, but at this time, the dissolved liquid contains insoluble impurities such as dust particles, and after the subsequent liquid is cooled and crystallized, the crystallization needs to be filtered, at this time, the insoluble impurities will accumulate in the crystallization, so that the crystallization after production contains impurities, affecting the quality of the product. SUMMARY

[0004] In order to overcome the defect that the insoluble impurities will accumulate in the crystallization, so that the crystallization after production contains impurities, affecting the quality of the product, the application provides a reaction kettle with impurity removal function and a p-aminophenylalanine impurity removal method.

[0005] The technical scheme of the application is: a reaction kettle with impurity removal function, comprising a reaction kettle; further comprising a discharge pipe, a filter screen, an electric push rod one, a lifting block, a fixed block, a plugging block, an electric push rod two, a connecting frame, a liquid inlet pipe, an electric control valve and a liquid suction assembly; the reaction kettle is connected with the discharge pipe; an electric control valve is fixedly connected to the upper and lower parts of the discharge pipe; a filtering mechanism is connected inside the discharge pipe, the filtering mechanism is composed of a fixed frame and a filter screen, and the fixed frame is fixedly connected with the discharge pipe; the fixed frame is fixedly connected with the filter screen; the discharge pipe is fixedly connected with at least four electric push rod ones; the extension parts of all the electric push rod ones are fixedly connected with the lifting block; the inner side of the lifting block is in contact with the fixed frame; the fixed block is fixedly connected in the discharge pipe; the discharge pipe is fixedly connected with at least four electric push rod twos; the extension parts of all the electric push rod twos are fixedly connected with the connecting frame; the connecting frame is connected with the plugging block, and the lower part of the plugging block is in close contact with the fixed block; the fixed block is provided with a liquid inlet cavity; the fixed block is provided with eight liquid outlet holes; all the liquid outlet holes are in communication with the liquid inlet cavity; the liquid inlet pipe is in communication with the liquid inlet cavity of the fixed block; the filter screen is located above the fixed block, and the filter screen, the fixed block and the plugging block are located between the two electric control valves; the electric push rod one, the electric push rod two and the electric control valve are respectively connected with an external power supply; the discharge pipe is connected with the liquid suction assembly.

[0006] Further, the liquid suction assembly comprises a liquid suction pipe, a water pump and a connecting pipe; the liquid suction pipe is communicated with the discharge pipe; the liquid suction pipe is located above the lower electric control valve; the liquid suction pipe is communicated with the water pump; the water pump outlet is communicated with the connecting pipe; the connecting pipe discharge port is located on the lower side of the reaction kettle; and the water pump is connected with the external power supply.

[0007] Further, the filter screen is in a convex shape.

[0008] Further, the liquid suction assembly comprises a liquid suction pipe, a water pump and a connecting pipe; the liquid suction pipe is communicated with the discharge pipe; the liquid suction pipe is located above the lower electric control valve; the liquid suction pipe is communicated with the water pump; the water pump outlet is communicated with the connecting pipe; the connecting pipe discharge port is located on the lower side of the reaction kettle; and the water pump is connected with the external power supply.

[0009] Further, the plugging block is provided with a crushing part, and a crushing space is formed between the crushing part and the fixed block.

[0010] Further, the contact area of the plugging block and the fixed block is made of silica gel.

[0011] Further, the liquid suction assembly comprises a liquid suction pipe, a water pump and a connecting pipe; the liquid suction pipe is communicated with the discharge pipe; the liquid suction pipe is located above the lower electric control valve; the liquid suction pipe is communicated with the water pump; the water pump outlet is communicated with the connecting pipe; the connecting pipe discharge port is located on the lower side of the reaction kettle; and the water pump is connected with the external power supply.

[0012] Further, the liquid suction assembly comprises a liquid suction pipe, a water pump and a connecting pipe; the liquid suction pipe is communicated with the discharge pipe; the liquid suction pipe is located above the lower electric control valve; the liquid suction pipe is communicated with the water pump; the water pump outlet is communicated with the connecting pipe; the connecting pipe discharge port is located on the lower side of the reaction kettle; and the water pump is connected with the external power supply.

[0013] Further, the liquid suction assembly comprises a liquid suction pipe, a water pump and a connecting pipe; the liquid suction pipe is communicated with the discharge pipe; the liquid suction pipe is located above the lower electric control valve; the liquid suction pipe is communicated with the water pump; the water pump outlet is communicated with the connecting pipe; the connecting pipe discharge port is located on the lower side of the reaction kettle; and the water pump is connected with the external power supply.

[0014] Further, a method for removing impurities from aminomethylbenzoic acid is provided, and the specific steps are as follows: step one: aminomethylbenzoic acid and a dissolving agent are respectively discharged into the shell, and then the aminomethylbenzoic acid and the dissolving agent are stirred and cooled by rotating the electric stirring rod, so that the aminomethylbenzoic acid and the dissolving agent are fused together, and the aminomethylbenzoic acid in the solution forms crystals, and the crystallized aminomethylbenzoic acid is in a state of completed impurity removal; step two: after heating, the solution is circulated to filter the insoluble impurities in the solution, thereby avoiding the need for additional filtering operation and reducing the complexity of impurity removal work; step three: the solution and the crystals are separated by the filter screen, and then the crystals are intercepted by the fixed block and the plugging block, and then the crystals are washed by the washing agent; step four: the plugging block is repeatedly moved up and down, so that the crushing part crushes the crystals in a lump state, thereby avoiding the need for subsequent crushing work, reducing the workload of impurity removal treatment, and speeding up the production.

[0015] Step five: during cooling, the solution is circulated to filter part of the formed crystals during the cooling and precipitation process, thereby avoiding a large amount of crystals from being lumped and accelerating the overall work efficiency. Advantages

[0016] By circulating the solution, the insoluble impurities in the solution are filtered, thereby avoiding the need for additional filtering operation and reducing the complexity of impurity removal work.

[0017] By washing a small amount of crystals each time, it is ensured that all crystals can be washed, avoiding the situation that part of the crystals cannot be washed, and this washing method cannot purchase additional washing equipment, thereby saving the production cost of the enterprise.

[0018] The crushing part crushes the crystalline in the extruded and caked state, so that it is broken into normal crystal size, thereby avoiding the need for subsequent crushing work, reducing the workload of impurity removal treatment and speeding up the production speed.

[0019] The pushing block pushes the crystals to move, thereby speeding up the discharge speed of the crystals, and when the crystals are crushed by extrusion, they may be attached to the fixed block, thereby causing the crystals to be unable to be discharged, so the attached crystals can be pushed at this time to avoid blockage and the like.

[0020] And when the crystals are cooled, part of the crystals are filtered first, and then the filtered crystals are washed and crushed, thereby avoiding the formation of caking caused by the slow discharge of the crystals after crystallization, and the filtering, washing and crushing of the crystals can be carried out during the cooling process, so that the impurity removal efficiency of aminomethylbenzoic acid is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure schematic view of the reaction kettle with impurity removal function disclosed by the present application is disclosed;

[0022] Figure 2 The structure sectional view of the outer shell and the discharge pipe of the reaction kettle with impurity removal function disclosed by the present application is disclosed;

[0023] Figure 3 The structure schematic view of the suction tube, water pump, liquid outlet pipe, electric control three-way valve and communication pipe of the reaction kettle with impurity removal function disclosed by the present application is disclosed;

[0024] Figure 4 The structure schematic view of the electric push rod I, lifting block, fixed block and plugging block of the reaction kettle with impurity removal function disclosed by the present application is disclosed;

[0025] Figure 5 The structure schematic view of the electric motor, pushing block and stirring plate of the reaction kettle with impurity removal function disclosed by the present application is disclosed.

[0026] Part names and serial numbers in the figure: 1 - shell, 2 - feed pipe, 3 - electric stirring rod, 4 - discharge pipe, 5 - filter screen, 6 - electric push rod one, 7 - lifting block, 8 - fixed block, 9 - blocking block, 10 - electric push rod two, 11 - connecting frame, 12 - liquid inlet pipe, 13 - electric control valve, 101 - motor, 102 - pushing block, 103 - stirring plate, 111 - connecting rod, 112 - cleaning plate, 201 - liquid suction pipe, 202 - water pump, 203 - liquid outlet pipe, 211 - electric control three-way valve, 212 - communication pipe, 8001 - liquid inlet cavity, 8002 - liquid outlet hole, 9001 - crushing part. DETAILED DESCRIPTION

[0027] The preferred technical solutions of the present application will be described in detail below with reference to the drawings. EMBODIMENT

[0028] A reaction kettle with impurity removal function as shown in Figures 2-5 The reaction kettle comprises a shell 1, a feed pipe 2, and an electric stirring rod 3. The upper left side and the upper right side of the shell 1 are each connected to a feed pipe 2. The shell 1 is fixedly connected to the electric stirring rod 3. The shell 1 is externally provided with cooling equipment. The electric stirring rod 3 is connected to an external power supply.

[0029] The reaction kettle further comprises a discharge pipe 4, a filter screen 5, an electric push rod one 6, a lifting block 7, a fixed block 8, a blocking block 9, an electric push rod two 10, a connecting frame 11, a liquid inlet pipe 12, an electric control valve 13, and a liquid suction assembly. The lower part of the shell 1 is connected to the discharge pipe 4. The upper part and the lower part of the discharge pipe 4 are each fixedly connected to an electric control valve 13. The discharge pipe 4 is internally connected to a filtering mechanism, which comprises a fixed frame and the filter screen 5. The fixed frame is fixedly connected to the discharge pipe 4. The fixed frame is fixedly connected to the filter screen 5 inside. The discharge pipe 4 is fixedly connected to four electric push rod ones 6. The extension parts of all the electric push rod ones 6 are collectively fixedly connected to the lifting block 7. The inner side of the lifting block 7 is in contact with the fixed frame. The space other than the filter screen 5 is blocked by the lifting block 7 and the fixed frame, so that the solution can only flow downward after passing through the filter screen 5. The discharge pipe 4 is fixedly connected to the fixed block 8. The discharge pipe 4 is fixedly connected to four electric push rod twos 10. The extension parts of all the electric push rod twos 10 are collectively fixedly connected to the connecting frame 11. The connecting frame 11 is connected to the blocking block 9, and the lower part of the blocking block 9 is in close contact with the fixed block 8. The fixed block 8 is provided with a liquid inlet cavity 8001. The fixed block 8 is provided with eight liquid outlet holes 8002. All the liquid outlet holes 8002 are collectively connected to the liquid inlet cavity 8001. The liquid inlet cavity 8001 of the fixed block 8 is connected to the liquid inlet pipe 12. The filter screen 5 is located above the fixed block 8, and the filter screen 5, the fixed block 8, and the blocking block 9 are all located between the two electric control valves 13. The electric push rod one 6, the electric push rod two 10, and the electric control valve 13 are respectively connected to an external power supply. The discharge pipe 4 is connected to the liquid suction assembly, and the filtered solution is sucked away through the liquid suction assembly.

[0030] The liquid suction assembly comprises a liquid suction pipe 201, a water pump 202 and a communication pipe 212; the liquid suction pipe 201 is communicated with the discharge pipe 4; the liquid suction pipe 201 is located above the lower electric control valve 13; the liquid suction pipe 201 is communicated with the water pump 202; the water outlet of the water pump 202 is communicated with the communication pipe 212; the discharge outlet of the communication pipe 212 is located in the shell 1; and the water pump 202 is connected with an external power supply.

[0031] The filter screen 5 is in a convex shape, so that the crystals are conveniently discharged to the outside of the filter screen 5, the discharging speed is accelerated, and the middle part of the filter screen 5 is prevented from being blocked.

[0032] The specific working steps are as follows:

[0033] The left and right two feeding pipes 2 are respectively connected with external feeding devices, the two external feeding devices respectively convey dissolving agents and aminomethylbenzoic acid, an external collecting device is connected with the discharge pipe 4, and the liquid inlet pipe 12 is connected with an external water conveying device.

[0034] When the impurity removal of aminomethylbenzoic acid is needed, firstly, the aminomethylbenzoic acid and the dissolving agent are respectively discharged to the feeding pipe 2 through the external feeding device, and then discharged into the shell 1 through the feeding pipe 2, and then the electric stirring rod 3 is started to rotate to stir the aminomethylbenzoic acid and the dissolving agent, when the stirring is completed, the aminomethylbenzoic acid and the dissolving agent are fused together, and then the external cooling equipment on the shell 1 cools the solution mixed together in the shell 1, so that the aminomethylbenzoic acid in the solution forms crystals, and in the process of cooling the dissolved aminomethylbenzoic acid, the upper electric control valve 13 is opened, so that the solution is discharged into the discharge pipe 4, the electric push rod two 10 drives the blocking piece 9 to rise through the connecting frame 11, so that the blocking piece 9 is no longer in contact with the fixed block 8, so that the solution is discharged to the lower electric control valve 13 in the closed state, and then the water pump 202 is started, so that the water pump 202 sucks the solution in the discharge pipe 4 through the suction pipe 201, so that the solution is discharged into the communication pipe 212, and then discharged into the shell 1 through the communication pipe 212, so that the solution is in a circulating state, and when the solution circulates, the insoluble impurities in the solution are intercepted by the filter screen 5, so as to separate the insoluble impurities from the solution, and after the separation is completed, the upper electric control valve 13 is closed to avoid the solution being discharged into the discharge pipe 4 again, and then the cooling work of the solution is started, and then the blocking piece 9 is lowered to be close to the fixed block 8, and then the lifting block 7 is controlled to be lowered, so that the lifting block 7 is separated from the fixed frame, since the filter screen 5 is protruding, the insoluble impurities flow outward of the filter screen 5, at this time, the insoluble impurities fall on the fixed block 8 and the blocking piece 9 from the filter screen 5, and then the external water feeding equipment feeds water through the liquid inlet pipe 12, so that the water flows through the liquid inlet pipe 12 and the liquid inlet cavity 8001, and finally sprays out from the liquid outlet hole 8002, so that the water fills the upper half of the discharge pipe 4, so that the water mixes with the insoluble impurities, and then the blocking piece 9 rises to be separated from the fixed block 8, so that the insoluble impurities are discharged together with the detergent to the lower half of the discharge pipe 4, and since the water fills the upper half of the discharge pipe 4, when the filter screen 5 is left with insoluble impurities, the water will carry the insoluble impurities away, at this time, the electric control valve 13 is opened, so that the insoluble impurities are discharged into the external collection equipment, so that the insoluble impurities in the solution are filtered by circulating the solution, thereby avoiding the need for additional filtering operation, reducing the complexity of the impurity removal work. Embodiment

[0035] Based on the embodiment 1, as shown in Figures 1-5 It further includes a liquid outlet pipe 203 and an electric control three-way valve 211; the communication pipe 212 is communicated with the liquid outlet pipe 203; the electric control three-way valve 211 is fixedly connected between the communication pipe 212 and the liquid outlet pipe 203; and the electric control three-way valve 211 is connected with the external power supply.

[0036] The blocking piece 9 is provided with a crushing part 9001, and there is a crushing space between the crushing part 9001 and the fixed block 8, which can crush the agglomerated crystals through the crushing space.

[0037] The contact area of the blocking block 9 and the fixed block 8 is made of silica gel material, so as to avoid crushing the crystal of the appropriate size when the blocking block 9 moves up and down.

[0038] The motor 101 and the pushing block 102 are further included; the lifting block 7 is fixedly connected with the motor 101; the output shaft of the motor 101 is fixedly connected with the fixed block 8; and the crushing part 9001 of the blocking block 9 is fixedly connected with four pushing blocks 102.

[0039] The stirring plate 103 is further included; the upper part of the blocking block 9 is fixedly connected with six stirring plates 103.

[0040] The connecting rod 111 and the cleaning plate 112 are further included; the upper part of the blocking block 9 is fixedly connected with the connecting rod 111; the connecting rod 111 penetrates through the filter screen 5; the connecting rod 111 is fixedly connected with four cleaning plates 112; the cleaning plates 112 are located on the upper side of the filter screen 5; and the cleaning plates 112 are in contact with the upper side of the filter screen 5.

[0041] A method for removing impurities from p-aminophenylacetic acid is provided, and the specific steps are as follows:

[0042] Step one: the p-aminophenylacetic acid and the dissolving agent are respectively arranged in the shell 1, and then the p-aminophenylacetic acid and the dissolving agent are stirred and cooled by rotating the electric stirring rod 3, so that the p-aminophenylacetic acid and the dissolving agent are fused together, and the p-aminophenylacetic acid in the solution forms crystals, and the crystallized p-aminophenylacetic acid is in a state of completed impurity removal;

[0043] Step two: after heating, the solution is circulated to filter the insoluble impurities in the solution, thereby avoiding the need for additional filtering operation and reducing the complexity of impurity removal work;

[0044] Step three: the solution is separated from the crystals by the filter screen 5, and then the crystals are intercepted by the fixed block 8 and the blocking block 9, and then the crystals are washed by the washing agent;

[0045] Step four: the crushing part 9001 crushes the crystalline in the agglomerated state by repeatedly moving the blocking block 9 up and down, thereby avoiding the need for subsequent crushing work, reducing the workload of impurity removal treatment, and speeding up the production.

[0046] Step five: during cooling, the solution is circulated to filter part of the formed crystals during the cooling and precipitation process, thereby avoiding the agglomeration of a large amount of crystals and speeding up the overall work efficiency.

[0047] The specific working steps are as follows:

[0048] The liquid outlet pipe 203 is connected with an external wastewater collection device.

[0049] In view of the fact that the existing purification operation needs to filter a large amount of crystal into the washing device for washing, and due to the large amount of washed crystal, part of the crystal is not washed, and in the impurity removal process, only simple washing is needed, but additional washing equipment is needed for special washing work, resulting in increased impurity removal cost, so when the cooling work is completed, the upper electric control valve 13 is opened, the solution in the shell 1 is discharged into the discharge pipe 4, and the electric push rod two 10 drives the blocking block 9 to rise through the connecting frame 11, so that the blocking block 9 is no longer in contact with the fixed block 8, so that the solution is discharged to the lower closed electric control valve 13, and then the water pump 202 is opened, and the water pump 202 sucks the solution in the discharge pipe 4 through the liquid suction pipe 201, and controls the electric control three-way valve 211, so that the liquid suction pipe 201 and the communication pipe 212 are no longer communicated, at this time the solution will be discharged from the liquid outlet pipe 203 to the external waste water collection equipment; and during the flow of the solution in the discharge pipe 4, the filter screen 5 will play a filtering role, and the crystal in the solution will be intercepted on the filter screen 5, and then the electric push rod two 10 drives the blocking block 9 to descend, so that the blocking block 9 is in contact with the fixed block 8, at this time the fixed block 8 and the upper electric control valve 13 will form a sealed space, then the electric push rod one 6 is controlled to drive the lifting block 7 to descend, so that the lifting block 7 is no longer in contact with the filter screen 5, forming a gap, at this time the crystal will fall from the gap to the fixed block 8, and the external water supply equipment connected with the liquid inlet pipe 12 is removed, so that the external liquid supply equipment is communicated with the liquid inlet pipe 12, and then the external liquid supply equipment transports the detergent to the liquid inlet pipe 12, so that the detergent is sprayed from the liquid outlet hole 8002 through the liquid inlet pipe 12 and the liquid inlet cavity 8001. At this time, the detergent will wash the crystal from bottom to top, so as to realize the washing work of the crystal, and after the washing work is completed, the lower electric control valve 13 is opened, and then the blocking block 9 is lifted away from the fixed block 8, so that the crystal and the detergent are discharged from the gap between the blocking block 9 and the fixed block 8, and then discharged into the external collection equipment, and then the upper electric control valve 13 is opened again, so as to filter the next batch of solution and wash the crystal. Repeat this process until all the crystals in the shell 1 are washed, so that all the crystals can be washed, and the situation that part of the crystal cannot be washed is avoided, and this washing method does not need to purchase additional washing equipment, thereby saving the production cost of the enterprise.

[0050] Considering that the aminomethylbenzoic acid will precipitate at the bottom of the shell 1 after crystallization, which will also cause the crystallization to be caked, and after washing, it may also need to be crushed to make the size of the crystallization meet the production standards, so when the crystallization is discharged at the end of the washing, the electric push rod 2 10 will repeatedly drive the blocking block 9 to move up and down, and the maximum distance of the blocking block 9 rising from the fixed block 8 will be less than the volume of the caked body, so that the normal crystallization will be discharged from the gap between the fixed block 8 and the blocking block 9, and the crystallization in the form of caking will be blocked, but since there is a distance between the crushing part 9001 of the blocking block 9 itself and the fixed block 8, when the blocking block 9 rises, the distance will increase, so that the caked body enters between the crushing part 9001 and the fixed block 8, and when the blocking block 9 descends, the crushing part 9001 will crush the crystallization in the form of caking, so that it is broken into normal crystallization size, thereby avoiding the need for subsequent crushing work, thereby reducing the workload of impurity removal treatment and speeding up the production speed.

[0051] While the blocking block 9 repeatedly moves up and down, the motor 101 will drive the pushing block 102 to rotate counterclockwise from the perspective of the top, so that the pushing block 102 pushes the crystallization to move, thereby speeding up the speed of crystallization discharge, and when the crystallization is crushed, it may be attached to the fixed block 8, thereby causing the crystallization to be unable to be discharged, so at this time the attached crystallization can be pushed to avoid blockage and the like.

[0052] When the washing agent is sprayed for flushing, the motor 101 will also drive the stirring plate 103 to rotate through the blocking block 9, at which time the rotation of the stirring plate 103 will stir the washing agent to form a vortex, so that the washing agent is mixed with the crystallization faster, thereby speeding up the washing speed and ensuring the washing efficiency and effect; and when the solution is discharged, the motor 101 will drive the connecting rod 111 and the cleaning plate 112 to rotate through the blocking block 9, so that the cleaning plate 112 pushes the crystallization to move to the outside of the filter screen 5, thereby avoiding blockage, and when the crystallization is discharged onto the fixed block 8, the cleaning plate 112 can also push the crystallization to move to the outside of the filter screen 5, thereby speeding up the speed of crystallization discharge.

[0053] Considering that in the process of crystallization, due to the long crystallization time, the crystallization that is first precipitated will stick together during stirring, thereby forming a caked body, so when part of the crystallization is precipitated and cooled, the circulation mode in embodiment 1 can be used to filter part of the crystallization, and then the filtered crystallization is washed and crushed, thereby avoiding the formation of a caked body due to the slow discharge of the crystallization after precipitation, and the crystallization filtering, washing and crushing work can be carried out during cooling, so as to speed up the impurity removal efficiency of aminomethylbenzoic acid.

[0054] Step five: during cooling, the solution is circulated to filter part of the formed crystallization during cooling and precipitation, so as to avoid a large amount of crystallization caking and to speed up the overall work efficiency.

[0055] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A reactor with impurity removal function, comprising a reactor; characterized in that, The utility model also includes a discharge pipe (4), a filter screen (5), an electric push rod one (6), a lifting block (7), a fixed block (8), a blocking block (9), an electric push rod two (10), a connecting frame (11), a liquid inlet pipe (12), an electric control valve (13) and a liquid suction assembly; the reaction kettle is communicated with the discharge pipe (4); one electric control valve (13) is fixedly connected to the upper portion and the lower portion of the discharge pipe (4) respectively; the discharge pipe (4) is internally connected with a filtering mechanism, the filtering mechanism is composed of a fixed frame and the filter screen (5), the fixed frame is fixedly connected with the discharge pipe (4); the fixed frame is fixedly connected with the filter screen (5) in the inside; the discharge pipe (4) is fixedly connected with at least four electric push rod one (6); the retractable portions of all electric push rod one (6) are fixedly connected with the lifting block (7) in common; the inner side of the lifting block (7) is in contact with the fixed frame; the discharge pipe (4) is fixedly connected with the fixed block (8) in the inside; the discharge pipe (4) is fixedly connected with at least four electric push rod two (10); the retractable portions of all electric push rod two (10) are fixedly connected with the connecting frame (11) in common; the connecting frame (11) is connected with the blocking block (9), the lower portion of the blocking block (9) is in close contact with the fixed block (8); the fixed block (8) is provided with a liquid inlet cavity (8001); the fixed block (8) is provided with eight liquid outlet holes (8002); all liquid outlet holes (8002) are communicated with the liquid inlet cavity (8001) in common; the liquid inlet cavity (8001) of the fixed block (8) is communicated with the liquid inlet pipe (12); the filter screen (5) is located above the fixed block (8), and the filter screen (5), the fixed block (8) and the blocking block (9) are all located between the two electric control valves (13); the electric push rod one (6), the electric push rod two (10) and the electric control valve (13) are connected with an external power supply respectively; the discharge pipe (4) is communicated with the liquid suction assembly; The blocking block (9) is provided with a crushing portion (9001), and a crushing space exists between the crushing portion (9001) and the fixed block (8); The utility model also includes a motor (101) and a pushing block (102); the connecting frame (11) is fixedly connected with the motor (101); the output shaft of the motor (101) is fixedly connected with the blocking block (9); at least four pushing blocks (102) are fixedly connected to the crushing portion (9001) of the blocking block (9); The utility model also includes a stirring plate (103); at least six stirring plates (103) are fixedly connected to the upper portion of the blocking block (9); The utility model also includes a connecting rod (111) and a cleaning plate (112); the connecting rod (111) is fixedly connected to the upper portion of the blocking block (9); the connecting rod (111) penetrates through the filter screen (5); at least four cleaning plates (112) are fixedly connected to the connecting rod (111); the cleaning plates (112) are located on the upper side of the filter screen (5); and the cleaning plates (112) are in contact with the upper side of the filter screen (5).

2. The reaction kettle with impurity removal function according to claim 1, characterized in that, The liquid suction assembly includes a liquid suction pipe (201), a water pump (202) and a communication pipe (212); the discharge pipe (4) is communicated with the liquid suction pipe (201); the liquid suction pipe (201) is located above the lower electric control valve (13); the liquid suction pipe (201) is communicated with the water pump (202); the water outlet of the water pump (202) is communicated with the communication pipe (212); the discharge outlet of the communication pipe (212) is located on the lower side of the reaction kettle; the water pump (202) is connected with an external power supply.

3. The reaction kettle with impurity removal function according to claim 1, characterized in that, The filter screen (5) is convex.

4. The reaction kettle with the impurity removal function according to any one of claims 1-3, characterized in that, The liquid outlet pipe (203) and the electrically controlled three-way valve (211) are further included; the communication pipe (212) is communicated with the liquid outlet pipe (203); the electrically controlled three-way valve (211) is fixed between the communication pipe (212) and the liquid outlet pipe (203); and the electrically controlled three-way valve (211) is connected with the external power supply.

5. The reaction kettle with impurity removal function according to claim 1, characterized in that, The contact area of the blocking block (9) and the fixing block (8) is made of silica gel.

6. A method of purifying aminomethylbenzoic acid, characterized by, The specific steps of the reaction kettle with impurity removal function according to claim 1 are as follows: Step one: p-aminomethylbenzoic acid and solvent are respectively arranged in the shell (1), and then the p-aminomethylbenzoic acid and the solvent are stirred by rotating the electric stirring rod (3) to make the p-aminomethylbenzoic acid and the solvent fused together; Step two: by circulating the solution, the insoluble impurities in the solution are filtered, thereby avoiding the need for additional filtering operation and reducing the complexity of impurity removal work; Step three: cooling makes the p-aminomethylbenzoic acid in the solution form crystals, the crystallized p-aminomethylbenzoic acid is in the state of completed impurity removal, the solution and the crystals are separated through the filter screen (5), and then the crystals are intercepted by the fixing block (8) and the blocking block (9), and then the crystals are washed by the detergent; Step four: the blocking block (9) is repeatedly moved up and down, so that the crushing part (9001) crushes the crystals in the lump state, thereby avoiding the need for subsequent crushing work, reducing the workload of impurity removal treatment, and speeding up the production.

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