Reaction water removal device for o-phenylenediamine production

Abstract

The utility model discloses a reaction water removal device for o-phenylenediamine production, which relates to the technical field of o-phenylenediamine production, and comprises a dehydration tank and a heating shell, the top end of the dehydration tank is hermetically connected with a cap, the top of the cap is communicated and connected with an air inlet pipe, an air outlet cylinder and a feeding cylinder with a valve, a valve body is further arranged on the air inlet pipe, a discharging barrel with a valve is connected to the bottom of the dewatering tank in a penetrating mode, a vacuum pump is connected to the end, away from the cover cap, of the air outlet barrel, and the dewatering tank is sleeved with the heating shell. The heating shell is started to heat o-phenylenediamine in the dehydration tank, the vacuum pump is started to pump out air in the dehydration tank, and the interior of the dehydration tank is in a negative pressure state, so that the boiling point of water in raw materials is reduced, all the valves are opened, outside air enters the dehydration tank, and meanwhile the air in the dehydration tank is pumped out; therefore, water vapor in the dehydration tank is brought out, and the use effect is good.

Description

Technical Field

[0001] This utility model relates to the field of o-phenylenediamine production technology, specifically to a reaction water removal device for o-phenylenediamine production. Background Technology

[0002] o-Phenylenediamine is an organic compound that is a colorless monoclinic crystal at room temperature. Its color darkens in air and sunlight. It is slightly soluble in cold water and readily soluble in ethanol, ether, and chloroform. It is an intermediate in the production of dyes, pesticides, auxiliaries, and photosensitive materials. It is used in the manufacture of polyamides, polyurethanes, carbendazim and thiophanate-methyl, Vat Red GG, leveling agents, and antioxidants MB. It is also used in the preparation of developers and surfactants.

[0003] The production process of o-phenylenediamine can be summarized as follows: aniline and nitric acid are used as the main raw materials. A nitration reaction is carried out under the action of a catalyst to produce o-phenylenediamine and water. The crude product is then obtained through separation and purification. After washing and dehydration, high-purity o-phenylenediamine product is finally obtained. Among these steps, washing is one of the key steps to remove impurities and unreacted raw materials.

[0004] However, because the material contains reaction water after washing, the product has a high water content. The original design did not treat the water-containing material, so the secondary water washing product was directly fed into the o-phenylenediamine discharge tank, resulting in low efficiency, low product quality, and low product output in the downstream distillation process. Utility Model Content

[0005] The purpose of this invention is to provide a reaction water removal device for o-phenylenediamine production, so as to solve the technical problem of low production efficiency of o-phenylenediamine in the prior art.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0007] A reaction water removal device for o-phenylenediamine production includes a dehydration tank and a heating shell. The top of the dehydration tank is sealed with a cap, and the top of the cap is connected to an inlet pipe, an outlet pipe, and a feed pipe with a valve. The inlet pipe is also equipped with a valve body. The bottom of the dehydration tank is connected to an outlet pipe with a valve. The end of the outlet pipe away from the cap is connected to a vacuum pump. The heating shell is fitted on the outside of the dehydration tank. The cap is fitted with a stirring structure that extends into the dehydration tank and is used to stir the o-phenylenediamine inside.

[0008] As a further embodiment of this utility model, the dehydration tank and the cap are detachably connected by bolts or buckles.

[0009] As a further embodiment of this utility model: the stirring structure includes a motor, the motor is fixed on the top of the cap, the drive shaft of the motor passes through the cap, and its end is connected to a rotating shaft, and a plurality of stirring shafts are distributed on both sides of the rotating shaft.

[0010] As a further aspect of this utility model, the diameter of the dehydration tank gradually decreases from its top downwards.

[0011] As a further embodiment of this utility model: a scraping structure is movably fitted on the rotating shaft, the scraping structure including a lifting structure and a scraper, the lifting structure being used to drive the scraper to move up and down, and the scraper cooperating with the inner wall of the dehydration tank.

[0012] As a further embodiment of this utility model: the lifting structure includes a slide rod, the inside of the rotating shaft is provided with a slide groove, one end of the slide groove is fixed with an electric telescopic rod, the driving end of the electric telescopic rod is connected to the end of the slide rod, the slide rod is slidably connected inside the slide groove, and a scraper is connected to the side of the slide rod.

[0013] As a further embodiment of this utility model: a plurality of connecting rods are distributed on both sides of the slide rod, and the end of the connecting rod away from the slide rod is connected to the scraper.

[0014] As a further embodiment of this utility model: the side of the rotating shaft is provided with a plurality of through holes communicating with the sliding groove, and the connecting rod is slidably connected in the corresponding through holes.

[0015] As a further embodiment of this invention, the air intake pipe is provided with a filter plate for filtering air impurities.

[0016] As a further embodiment of this utility model, a temperature measuring instrument is provided at the bottom of the dehydration tank.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model uses a heating shell to heat the o-phenylenediamine inside the dehydration tank, and a vacuum pump to extract the air from the dehydration tank, creating a negative pressure inside the tank. This lowers the boiling point of water in the raw material, allowing the water to boil and evaporate in large quantities at a lower temperature. After heating for a period of time, the valves are opened to allow outside air to enter the dehydration tank while simultaneously extracting the air from inside the tank, thus removing the water vapor inside. This method has good performance.

[0019] 2. In the feeding process, the scraper can be driven to rotate during the rotation of the shaft, thereby scraping off the o-phenylenediamine adhering to the inner wall of the dehydration tank and achieving complete discharge. During the stirring process, the retraction of the electric telescopic rod drives the slide bar and scraper to move upward synchronously, moving the scraper away from the inner wall of the dehydration tank, which can reduce the wear of the scraper during the stirring process. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a cross-sectional view of the structure of the dehydration tank and scraper of this utility model in use;

[0023] Figure 3 This is a schematic diagram of the structure of the rotating shaft and through hole of this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the rotating shaft and the electric telescopic rod of this utility model.

[0025] In the diagram: 1. Dehydration tank; 2. Cap; 3. Heating shell; 4. Rotating shaft; 5. Motor; 6. Stirring shaft; 7. Scraper; 8. Discharge cylinder; 9. Feed cylinder; 10. Temperature measuring instrument; 11. Air outlet cylinder; 12. Vacuum pump; 13. Air inlet pipe; 14. Filter plate; 15. Valve body; 16. Slide groove; 17. Slide rod; 18. Electric telescopic rod; 19. Through hole; 20. Connecting rod. Detailed Implementation

[0026] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1-4As shown, a reaction water removal device for o-phenylenediamine production includes a dehydration tank 1 and a heating shell 3. A cap 2 is sealed to the top of the dehydration tank 1, and the dehydration tank 1 and cap 2 are detachably connected by bolts or clips for easy cleaning of the inside of the dehydration tank 1. An air inlet pipe 13, an air outlet pipe 11, and a feed cylinder 9 with a valve are connected through the top of the cap 2. A valve body 15 is also installed on the air inlet pipe 13. A filter plate 14 for filtering air impurities is installed inside the air inlet pipe 13. The filter plate 14 is composed of activated carbon and filter cloth, thereby preventing dust and impurities in the outside air from contaminating the o-phenylenediamine in the dehydration tank 1. A feed cylinder 8 with a valve is connected through the bottom of the dehydration tank 1. A vacuum pump 1 is connected to the end of the air outlet pipe 11 away from the cap 2. 2. The heating shell 3 is fitted onto the outside of the dehydration tank 1. The heating shell 3 is used to heat the o-phenylenediamine inside the dehydration tank 1. The cap 2 is equipped with a stirring structure that extends into the dehydration tank 1 and is used to stir the o-phenylenediamine inside. After the o-phenylenediamine is introduced into the dehydration tank 1, the heating shell 3 is started to heat the o-phenylenediamine inside the dehydration tank 1. The vacuum pump 12 is started to extract the air from the dehydration tank 1, making the inside of the dehydration tank 1 a negative pressure state, thereby lowering the boiling point of water in the raw material, so that the water can boil and evaporate in large quantities at a lower temperature. After heating for a period of time, the valves are opened to allow outside air to enter the dehydration tank 1 while the air inside the dehydration tank 1 is extracted, thereby removing the water vapor inside the dehydration tank 1. The effect is good.

[0028] In some specific implementation plans, such as Figure 2 As shown, in order to heat the o-phenylenediamine inside the dehydration tank 1 evenly, the stirring structure includes a motor 5, which is fixed on the top of the cap 2. The drive shaft of the motor 5 passes through the cap 2 and is connected to a rotating shaft 4 at its end. Several stirring shafts 6 are distributed on both sides of the rotating shaft 4. The motor 5 drives the rotating shaft 4 to rotate, and the stirring shafts 6 stir the o-phenylenediamine inside the dehydration tank 1, thereby making the heating of the o-phenylenediamine more uniform.

[0029] In some specific implementation plans, such as Figure 2 or Figure 4As shown, to facilitate the scraping off of o-phenylenediamine adhering to the inside of the dehydration tank 1, the diameter of the dehydration tank 1 gradually decreases from the top downwards. A scraping structure is movably fitted on the rotating shaft 4. The scraping structure includes a lifting structure and a scraper 7. The lifting structure is used to drive the scraper 7 to move up and down. The scraper 7 cooperates with the inner wall of the dehydration tank 1. The lifting structure includes a slide rod 17. A slide groove 16 is opened inside the rotating shaft 4. An electric telescopic rod 18 is fixed to one end of the slide groove 16. The drive end of the electric telescopic rod 18 is connected to the slide rod. The end of 17 is connected, and the slide rod 17 is slidably connected inside the slide groove 16. The side of the slide rod 17 is connected to the scraper 7. During the feeding process, the scraper 7 can be driven to rotate during the rotation of the rotating shaft 4, thereby scraping off the o-phenylenediamine adhering to the inner wall of the dehydration tank 1 to achieve complete discharge. During the stirring process, the retraction of the electric telescopic rod 18 drives the slide rod 17 and the scraper 7 to move upward synchronously, moving the scraper 7 away from the inner wall of the dehydration tank 1, which can reduce the wear of the scraper 7 during the stirring process.

[0030] In some specific implementation plans, such as Figure 4 As shown, in order to enhance the stability of the scraper 7 movement, several connecting rods 20 are distributed on both sides of the slide rod 17. The end of the connecting rod 20 away from the slide rod 17 is connected to the scraper 7. Several through holes 19 communicating with the slide groove 16 are distributed on the side of the rotating shaft 4. The connecting rods 20 are slidably connected in the corresponding through holes 19.

[0031] In some specific implementation plans, such as Figure 2 As shown, in order to facilitate temperature control, a temperature measuring instrument 10 is installed at the bottom of the dehydration tank 1. The temperature of o-phenylenediamine in the dehydration tank 1 can be monitored through the setting of the temperature sensor valve body 15.

[0032] The foregoing has described several embodiments of this utility model in detail, but these embodiments are not limited thereto and should not be considered as limiting the scope of this utility model. All equivalent changes and improvements made within the scope of the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A reaction water removal device for o-phenylenediamine production, characterized in that, include: The dehydration tank (1) and the heating shell (3) are sealed at the top of the dehydration tank (1). The top of the cap (2) is connected to an air inlet pipe (13), an air outlet pipe (11) and a feed pipe (9) with a valve. The air inlet pipe (13) is also provided with a valve body (15). The bottom of the dehydration tank (1) is connected to a feed pipe (8) with a valve. The end of the air outlet pipe (11) away from the cap (2) is connected to a vacuum pump (12). The heating shell (3) is fitted on the outside of the dehydration tank (1). The cap (2) is provided with a stirring structure. The stirring structure extends into the dehydration tank (1) and is used to stir the o-phenylenediamine inside it.

2. The reaction water removal device for o-phenylenediamine production according to claim 1, characterized in that, The dehydration tank (1) and the cap (2) are detachably connected by bolts or clips.

3. The reaction water removal device for o-phenylenediamine production according to claim 1, characterized in that, The stirring structure includes a motor (5), which is fixed on the top of the cap (2). The drive shaft of the motor (5) passes through the cap (2) and its end is connected to a rotating shaft (4). Several stirring shafts (6) are distributed on both sides of the rotating shaft (4).

4. The reaction water removal device for o-phenylenediamine production according to claim 1, characterized in that, The diameter of the dehydration tank (1) gradually decreases from its top downwards.

5. The reaction water removal device for o-phenylenediamine production according to claim 3, characterized in that, A scraping structure is movably fitted on the rotating shaft (4). The scraping structure includes a lifting structure and a scraper (7). The lifting structure is used to drive the scraper (7) to move up and down. The scraper (7) is fitted with the inner wall of the dehydration tank (1).

6. The reaction water removal device for o-phenylenediamine production according to claim 5, characterized in that, The lifting structure includes a slide rod (17), and a slide groove (16) is provided inside the rotating shaft (4). An electric telescopic rod (18) is fixed at one end inside the slide groove (16). The driving end of the electric telescopic rod (18) is connected to the end of the slide rod (17). The slide rod (17) is slidably connected inside the slide groove (16). A scraper (7) is connected to the side of the slide rod (17).

7. The reaction water removal device for o-phenylenediamine production according to claim 6, characterized in that, Several connecting rods (20) are distributed on both sides of the slide rod (17), and the end of the connecting rod (20) away from the slide rod (17) is connected to the scraper (7).

8. The reaction water removal device for o-phenylenediamine production according to claim 7, characterized in that, The rotating shaft (4) has several through holes (19) on its side that communicate with the sliding groove (16), and the connecting rod (20) is slidably connected in the corresponding through hole (19).

9. The reaction water removal device for o-phenylenediamine production according to claim 1, characterized in that, The air intake pipe (13) is equipped with a filter plate (14) for filtering air impurities.

10. The reaction water removal device for o-phenylenediamine production according to claim 1, characterized in that, A temperature measuring instrument (10) is installed at the bottom of the dehydration tank (1).

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