A purification device for diphenylamine production

Abstract

The utility model relates to diphenylamine production technical field discloses a kind of purification devices for diphenylamine production, including reaction kettle, the upper surface of reaction kettle is fixedly installed with upper cover, the lower end of reaction kettle is fixedly installed with support, the outer surface of reaction kettle is fixedly installed with jacket, auxiliary discharging mechanism is set on upper cover, auxiliary discharging mechanism includes spiral conveying rod and vibrating motor, the upper surface of upper cover is fixedly installed with conveying pipeline, by the setting of spiral conveying rod and through-hole, the blade rotation of spiral conveying rod can scrape the pipe wall of conveying pipeline, reduce material residue, the through-hole on blade can break the wrapping of material to rod body, improve conveying efficiency, promote material flow simultaneously, reduce local retention, the vibration of vibrating motor can reduce the residue of material in pipeline, so that the material amount entering reaction kettle is closer to measurement value, ensure the material ratio of neutralization reaction, it is favorable to improve the purification effect of diphenylamine.

Description

Technical Field

[0001] This utility model relates to the field of diphenylamine production technology, specifically a purification device for diphenylamine production. Background Technology

[0002] Diphenylamine is an important organic chemical raw material with the chemical formula (C6H5)2NH. It is a white to light gray crystal with a melting point of 53-54℃ and a boiling point of 302℃. It is easily soluble in organic solvents and slightly soluble in water. It is mainly used in the manufacture of rubber antioxidants, dye intermediates, explosive stabilizers, and pharmaceutical intermediates. Its production uses aniline as the core raw material and is obtained through a condensation reaction: two molecules of aniline react with a catalyst (such as aluminum trichloride, solid acid, etc.) at a high temperature of 200-300℃, removing one molecule of ammonia to produce diphenylamine. The process consists of three steps: raw material pretreatment (aniline purification and dehydration), condensation reaction (carried out under normal or low pressure, requiring timely removal of ammonia to drive the reaction), and separation and purification (distillation to remove unreacted aniline, followed by alkali washing, water washing, and then vacuum distillation or crystallization to obtain the finished product). During production, it is necessary to control the temperature, catalyst dosage, and raw material purity, while also treating wastewater and waste gas. The current trend is to develop environmentally friendly catalysts and continuous processes to improve efficiency and reduce pollution.

[0003] Currently, in the production and purification process of diphenylamine, a pretreatment device is first used to distill the material to remove low-boiling-point impurities such as aniline. Then, the deanilined material is added to a neutralization reactor and stirred and neutralized with alkaline solution. However, the deanilined material exists in the form of a viscous molten liquid with poor fluidity. When added to the neutralization reactor, it will come into contact with the wall of the feed pipe and easily remain on the pipe wall. This will cause the actual amount of material entering the neutralization reactor to deviate from the measured value, disrupt the material ratio of the neutralization reaction, and affect the purification effect of diphenylamine. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a purification device for diphenylamine production. It solves the problem that the deanilined material exists in the form of a viscous molten liquid with poor fluidity. When added to the neutralization reactor, it comes into contact with the wall of the feed pipe and easily remains on the pipe wall, leading to a deviation between the actual amount of material entering the neutralization reactor and the measured value. This disrupts the material ratio of the neutralization reaction and affects the purification effect of diphenylamine.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a purification device for diphenylamine production, comprising a reaction vessel, a top cover fixedly installed on the upper surface of the reaction vessel, a support fixedly installed at the lower end of the reaction vessel, and a jacket fixedly installed on the outer surface of the reaction vessel;

[0008] An auxiliary feeding mechanism is installed on the upper cover. The auxiliary feeding mechanism includes a screw conveyor and a vibrating motor. A conveying pipe is fixedly installed on the upper surface of the upper cover. The lower end of the conveying pipe is open and extends to the bottom of the upper cover. The screw conveyor is rotatably installed on the upper inner wall of the conveying pipe. Multiple through holes are opened on the surface of the blades on the screw conveyor. A first feeding pipe is fixedly installed on the right surface of the conveying pipe. The lower end of the first feeding pipe extends to the interior of the conveying pipe. The vibrating motor is fixedly installed on the lower surface of the first feeding pipe. Three second feeding pipes are fixedly installed on the upper surface of the upper cover. The lower ends of the three second feeding pipes extend to the bottom of the upper cover.

[0009] Preferably, the auxiliary feeding mechanism further includes a feeding motor, which is fixedly installed on the upper surface of the conveying pipe. The output end of the feeding motor rotates through the interior of the conveying pipe, and the feeding motor is fixedly connected to the screw conveyor.

[0010] Preferably, a stirring motor is fixedly installed on the upper surface of the cover, and the output end of the stirring motor rotates through to the bottom of the cover.

[0011] Preferably, a stirring rod is rotatably mounted on the lower surface of the upper cover, and a stirring motor is fixedly connected to the stirring rod.

[0012] Preferably, a first gas supply pipe is fixedly installed on the upper left surface of the jacket, and a second gas supply pipe is fixedly installed on the lower right surface of the jacket. Both the first and second gas supply pipes are connected to the interior of the jacket.

[0013] Preferably, the upper surface of the conveying pipe and the upper surface of the three second feed pipes are all fitted with caps.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, the present invention provides a purification device for diphenylamine production, which has the following beneficial effects:

[0016] 1. This purification device for diphenylamine production utilizes a spiral conveyor rod and through-holes. The rotating blades of the spiral conveyor rod scrape away material residue from the pipe wall, reducing material buildup. The through-holes on the blades break up the material buildup on the rod, improving conveying efficiency and promoting material flow while reducing localized stagnation. The vibration of the vibrating motor further reduces material residue in the pipe, ensuring that the amount of material entering the reactor is closer to the measured value. This guarantees the material ratio for the neutralization reaction and improves the purification effect of diphenylamine. Attached Figure Description

[0017] Figure 1 This is a top view schematic diagram of the overall structure of the purification device for diphenylamine production according to this utility model;

[0018] Figure 2 This is a cross-sectional side view of the internal structure of the purification device for diphenylamine production according to this utility model;

[0019] Figure 3 This is a cross-sectional front view of the internal structure of the purification device for diphenylamine production according to this utility model;

[0020] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Reactor; 2. Top cover; 3. Support; 4. Jacket; 5. Screw conveyor; 6. Vibrating motor; 7. Conveying pipe; 8. Through hole; 9. First feed pipe; 10. Discharge motor; 11. Second feed pipe; 12. Stirring motor; 13. Stirring rod; 14. First gas supply pipe; 15. Second gas supply pipe; 16. Cover. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a new technical solution: a purification device for the production of diphenylamine, including a reaction vessel 1, a top cover 2 fixedly installed on the upper surface of the reaction vessel 1, a support 3 fixedly installed at the lower end of the reaction vessel 1, and a jacket 4 fixedly installed on the outer surface of the reaction vessel 1.

[0024] An auxiliary feeding mechanism is installed on the upper cover 2. The auxiliary feeding mechanism includes a screw conveyor 5 and a vibrating motor 6. A conveying pipe 7 is fixedly installed on the upper surface of the upper cover 2. The lower end of the conveying pipe 7 is open and extends to the bottom of the upper cover 2. The screw conveyor 5 is rotatably installed on the upper inner wall of the conveying pipe 7. Multiple through holes 8 are opened on the surface of the blades on the screw conveyor 5. A first feeding pipe 9 is fixedly installed on the right surface of the conveying pipe 7. The lower end of the first feeding pipe 9 extends to the interior of the conveying pipe 7. The vibrating motor 6 is fixedly installed on the lower surface of the first feeding pipe 9. Three second feeding pipes 11 are fixedly installed on the upper surface of the upper cover 2. The lower ends of the three second feeding pipes 11 extend to the bottom of the upper cover 2.

[0025] Furthermore, the auxiliary feeding mechanism also includes a feeding motor 10, which is fixedly installed on the upper surface of the conveying pipe 7. The output end of the feeding motor 10 rotates through the interior of the conveying pipe 7, and the feeding motor 10 is fixedly connected to the screw conveyor 5.

[0026] Furthermore, through the arrangement of the spiral conveying rod 5 and the through hole 8, the rotation of the blades of the spiral conveying rod 5 can scrape the wall of the conveying pipe 7, reducing material residue. The through hole 8 on the blade can break the material wrapping around the rod, improving conveying efficiency and promoting material flow, reducing local stagnation. The vibration energy of the vibration motor 6 can reduce material residue in the pipe, making the amount of material entering the reactor 1 closer to the metering value, ensuring the material ratio of the neutralization reaction, and helping to improve the purification effect of diphenylamine.

[0027] Furthermore, a stirring motor 12 is fixedly installed on the upper surface of the upper cover 2, and the output end of the stirring motor 12 rotates through to the bottom of the upper cover 2.

[0028] Furthermore, a stirring rod 13 is rotatably mounted on the lower surface of the upper cover 2, and the stirring motor 12 is fixedly connected to the stirring rod 13.

[0029] Furthermore, a first gas supply pipe 14 is fixedly installed on the upper left surface of the jacket 4, and a second gas supply pipe 15 is fixedly installed on the lower right surface of the jacket 4. Both the first gas supply pipe 14 and the second gas supply pipe 15 are connected to the interior of the jacket 4.

[0030] Furthermore, the upper surface of the conveying pipe 7 and the upper surface of the three second feed pipes 11 are all fitted with caps 16.

[0031] Furthermore, during the neutralization reaction of the deanilined material, firstly, the molten material after deaniline removal enters the conveying pipe 7 through the first feed pipe 9. Simultaneously, the materials required for the neutralization reaction, such as the alkali solution, are added to the reactor 1 through three second feed pipes 11. The feeding motor 10 is started, and its output end drives the screw conveyor 5 to rotate inside the conveying pipe 7. The blades of the screw conveyor 5 push the material downwards, finally entering the reactor 1 through the opening at the lower end of the conveying pipe 7. At this time, the stirring motor 12 is started, and its output end drives the stirring rod 13 to rotate, stirring the material in the reactor 1 to fully mix the deanilined material with the alkali solution, completing the neutralization reaction. The heating medium can be introduced into the jacket 4 through the second gas supply pipe 15 and then discharged through the first gas supply pipe 14 to control the temperature inside the reactor 1 and ensure that the neutralization reaction is carried out under suitable conditions. When the material enters from the first feed pipe 9, the vibration motor 6 starts and the vibration generated is transmitted to the first feed pipe 9 to reduce the material residue on the pipe wall of the first feed pipe 9. After entering the conveying pipe 7, the screw conveyor 5 rotates under the drive of the motor. Multiple through holes 8 on the blades allow some material to flow from the top of the blades to the bottom. With the pushing action of the blades, the material is conveyed to the reactor 1. When the blades rotate, they scrape the pipe wall of the conveying pipe 7, further reducing the material residue.

[0032] Structural Description: Reactor 1: As the core container for the neutralization reaction, it provides space for material mixing and reaction, and is covered by a jacket 4 to control the temperature;

[0033] Top cover 2: Seals the top of reactor 1, supports the auxiliary feeding mechanism and feed pipe, and ensures a sealed reaction environment;

[0034] Support bracket 3: Supports reactor 1 to ensure stable operation of the device;

[0035] Jacket 4: Heat medium is introduced through the first and second gas supply pipes 14 and 15 to regulate the reaction temperature;

[0036] Screw conveyor 5: Rotates under the drive of motor 10 to push materials into reactor 1; blade through hole 8 reduces clogging.

[0037] Vibration motor 6: Installed below the first feed pipe 9, it reduces the adhesion and residue of materials in the pipe through vibration;

[0038] Conveying pipe 7: connects the first feed pipe 9 to the reactor 1, and has a built-in spiral conveyor 5 to guide the flow of materials;

[0039] Through hole 8: Opened on the surface of the spiral blade of the spiral conveyor 5 to promote material diversion and discharge;

[0040] First feed pipe 9: introduces the aniline-free material, and works with vibrating motor 6 to ensure smooth material conveying;

[0041] Feeding motor 10: drives the screw conveyor 5 to rotate, providing power for material conveying; the speed is adjustable.

[0042] Second feed pipe 11: There are three in total, used to add neutralizing agents such as alkali solution. The multi-channel design ensures accurate proportioning.

[0043] Stirring motor 12: Drives stirring rod 13 to rotate, accelerates material mixing reaction, and improves neutralization efficiency;

[0044] Stirring rod 13: Stirs the material in the reaction vessel 1 to ensure that the deanilined material and the alkaline solution are fully in contact and react.

[0045] First gas pipeline 14: Discharges the hot or cold medium from the jacket 4 to achieve temperature circulation control;

[0046] Second gas pipeline 15: Inputs steam or hot oil into jacket 4 to raise the reaction temperature;

[0047] Cover 16: Seals the top of the conveying pipe 7 and the second feed pipe 11 to prevent impurities from entering and materials from overflowing.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A purification apparatus for diphenylamine production, comprising a reaction vessel (1), a top cover (2) fixedly mounted on the upper surface of the reaction vessel (1), and a support (3) fixedly mounted on the lower end of the reaction vessel (1), characterized in that: A jacket (4) is fixedly installed on the outer surface of the reactor (1); An auxiliary feeding mechanism is set on the upper cover (2). The auxiliary feeding mechanism includes a screw conveyor (5) and a vibration motor (6). A conveying pipe (7) is fixedly installed on the upper surface of the upper cover (2). The lower end of the conveying pipe (7) is open and extends to the bottom of the upper cover (2). The screw conveyor (5) is rotatably installed on the upper inner wall of the conveying pipe (7). Multiple through holes (8) are opened on the blade surface of the screw conveyor (5). A first feeding pipe (9) is fixedly installed on the right surface of the conveying pipe (7). The lower end of the first feeding pipe (9) extends to the inside of the conveying pipe (7). The vibration motor (6) is fixedly installed on the lower surface of the first feeding pipe (9). Three second feeding pipes (11) are fixedly installed on the upper surface of the upper cover (2). The lower ends of the three second feeding pipes (11) extend to the bottom of the upper cover (2).

2. The purification apparatus for diphenylamine production according to claim 1, characterized in that: The auxiliary feeding mechanism also includes a feeding motor (10), which is fixedly installed on the upper surface of the conveying pipe (7). The output end of the feeding motor (10) rotates through the interior of the conveying pipe (7), and the feeding motor (10) is fixedly connected to the screw conveyor (5).

3. The purification apparatus for diphenylamine production according to claim 1, characterized in that: A stirring motor (12) is fixedly installed on the upper surface of the cover (2), and the output end of the stirring motor (12) rotates through to the bottom of the cover (2).

4. The purification apparatus for diphenylamine production according to claim 3, characterized in that: A stirring rod (13) is rotatably mounted on the lower surface of the upper cover (2), and the stirring motor (12) is fixedly connected to the stirring rod (13).

5. The purification apparatus for diphenylamine production according to claim 1, characterized in that: A first gas supply pipe (14) is fixedly installed on the upper left surface of the jacket (4), and a second gas supply pipe (15) is fixedly installed on the lower right surface of the jacket (4). Both the first gas supply pipe (14) and the second gas supply pipe (15) are connected to the interior of the jacket (4).

6. The purification apparatus for diphenylamine production according to claim 1, characterized in that: The upper surface of the conveying pipe (7) and the upper surface of the three second feed pipes (11) are all fitted with caps (16).

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