Tail gas absorption device in o-nitroaniline production process

Abstract

The utility model relates to the technical field of ortho-nitroaniline production, and discloses a tail gas absorption device in an ortho-nitroaniline production process, which comprises a water tank, a fan, a conveying pipe, a barrier plate, a motor I, a stirring rod, a heating pipe, a through pipe, a saline water tank, a gas distribution pipe and a cleaning mechanism. According to the tail gas absorption device in the o-nitroaniline production process, a fan is started to drive tail gas to reach the inner wall of a conveying pipe, so that the tail gas reaches the position below a barrier plate and reaches the interior of hot water at the same time, the tail gas in o-nitroaniline production is intercepted through the barrier plate, and a first motor drives a stirring rod to rotate and then drives the hot water to rotate; the hot water and the o-nitroaniline production tail gas are fully reacted and absorbed, and the ammonia gas reaches the through pipe, is driven into the gas-distributing pipe and is discharged through a plurality of groups of gas outlet holes above the gas-distributing pipe, so that the ammonia gas is fully contacted with the saline water, and the effects of conveniently fully reacting the o-nitroaniline production tail gas with the hot water and improving the dissolving efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of o-nitroaniline production, in particular to a tail gas absorption device in the o-nitroaniline production process. Background Art

[0002] p-Nitroaniline is a yellow needle-shaped crystal, highly toxic, easily sublimated, slightly soluble in cold water, soluble in boiling water, ethanol, ether, benzene and acid solution, and widely used as a synthetic chemical in the dye industry. It is an intermediate for a variety of printing and dyeing and pharmaceutical chemicals, and can also be used as an analytical reagent. p-Nitroaniline can be produced by the ammonolysis reaction of p-nitrochlorobenzene and ammonia in a reactor. The waste gas produced mainly includes biochemical p-nitroaniline and ammonia.

[0003] According to the Chinese patent publication number CN 218011966 U, a tail gas absorption device in the production process of p-nitroaniline is disclosed, which includes a hot water absorption box and an ammonia dissolution box, an ammonia dissolution box is installed on one side of the hot water absorption box, and a heating rod is fixedly installed inside the hot water absorption box. Beneficial effect: The utility model adopts a hot water absorption box. During the tail gas absorption process, the tail gas enters the hot water of the hot water absorption box along the gas pipeline through the conveying fan. The hot water in the hot water absorption box is maintained at 95°C to 99°C under the heating of the heating rod. The volatile p-nitroaniline contained in the tail gas is dissolved in the hot water, thereby separating from the volatile ammonia. The device uses the difference in the dissolution temperature of p-nitroaniline and ammonia to separate and absorb the tail gas, and separates ammonia while absorbing p-nitroaniline, thereby greatly improving the separation efficiency of the two, and improving the recovery efficiency of p-nitroaniline. It has a simple structure and low cost, and is suitable for popularization and use.

[0004] However, the above device has the problem that when the exhaust gas reaches the hot water absorption box, the contact surface between the exhaust gas and the hot water is small, resulting in a slow dissolution efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a tail gas absorption device in the production process of o-nitroaniline to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a tail gas absorption device in the production process of o-nitroaniline, comprising a water tank, a fan is fixedly connected above the water tank, a delivery pipe is fixedly connected to the air outlet end of the fan, a baffle is fixedly connected below the delivery pipe, a motor is fixedly connected above the water tank, a stirring rod is fixedly connected to the output end of the motor, a heating pipe is fixedly connected to the surface of the water tank, a through pipe is fixedly connected above the water tank, the other end of the through pipe is fixedly connected to a brine tank, an air distribution pipe is fixedly connected below the through pipe, and a cleaning mechanism is fixedly connected to the inner wall of the water tank.

[0007] Furthermore, by starting the fan, the fan drives the o-nitroaniline production tail gas to reach the inner wall of the conveying pipe, water is added to the inside of the water tank through the water inlet hole, the heating tube is started to heat the water inside the water tank, so that the o-nitroaniline production tail gas reaches the bottom of the baffle plate and reaches the inside of the hot water at the same time, and the o-nitroaniline production tail gas is intercepted by the baffle plate to increase the absorption time of the o-nitroaniline production tail gas, and the motor one is started to drive the stirring rod to rotate, so that the stirring rod drives the hot water inside the water tank to rotate, so that the hot water and the o-nitroaniline production tail gas are fully reacted and absorbed, and then the hot water reaches the through pipe through ammonia, so that it is driven into the gas distribution pipe and discharged through the multiple groups of gas outlets above the gas distribution pipe, and salt water is added to the salt water tank through the water inlet hole and the water outlet hole to make the ammonia gas fully contact with the salt water, so as to facilitate the o-nitroaniline production tail gas to fully react with the hot water and improve the dissolution efficiency.

[0008] Preferably, the water tank and the salt water tank are provided with water inlet holes above the surface, water outlet holes below the surface, and the salt water tank is provided with air outlet holes above the surface.

[0009] Furthermore, water inlet holes are provided above the surface of the water tank and the brine tank, and water outlet holes are provided below the surface, so that water and brine can be added to the water tank and the brine tank and discharged at the same time. An air outlet hole is provided above the brine tank to prevent excessive air pressure inside the brine tank.

[0010] Preferably, the delivery pipe and the baffle plate are both located on the inner wall of the water tank, and a plurality of groups of scattered holes are provided on the surface of the baffle plate.

[0011] Furthermore, the tail gas produced by o-nitroaniline is intercepted by the blocking plate to increase the absorption time of the tail gas produced by o-nitroaniline, and the multiple groups of diffuse holes opened on the surface of the blocking plate facilitate the dispersion of the tail gas produced by o-nitroaniline.

[0012] Preferably, the stirring rod is located above the blocking plate, and a plurality of groups of air outlet holes are provided above the air distribution pipe.

[0013] Furthermore, the hot water inside the water tank is rotated by a stirring rod, so that the hot water and the tail gas produced by o-nitroaniline are fully reacted and absorbed, and the ammonia is dispersedly discharged through multiple groups of air outlets above the gas distribution pipe, thereby improving the reaction efficiency with the brine.

[0014] Preferably, the cleaning mechanism comprises a second motor, an output end of the second motor is fixedly connected to a screw rod, and a scraper is threadedly connected to the surface of the screw rod.

[0015] Furthermore, when the inner wall of the water tank needs to be cleaned, motor 2 is started, and motor 2 drives the screw rod to rotate, so that the screw rod drives the scraper to move up and down on the inner wall of the water tank, so that the scraper cleans the inner wall of the water tank, thereby achieving the effect of facilitating the cleaning of the inner wall of the water tank.

[0016] Preferably, the second motor is fixedly connected above the water tank, and the screw rod is rotatably connected to the inner wall of the water tank.

[0017] Furthermore, the second motor drives the screw rod to rotate, so that the screw rod drives the scraper to move up and down on the inner wall of the water tank.

[0018] Preferably, the scraper is slidably connected to the inner wall of the water tank, and the outer surface of the scraper contacts the inner wall of the water tank.

[0019] Furthermore, the scraper is driven by the screw rod to move up and down on the inner wall of the water tank, and the outer surface of the scraper contacts the inner wall of the water tank, so that the scraper cleans the inner wall of the water tank.

[0020] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0021] First, the utility model starts the fan, which drives the o-nitroaniline production tail gas to reach the inner wall of the conveying pipe, adds water to the inside of the water tank through the water inlet hole, starts the heating pipe, heats the water inside the water tank, and makes the o-nitroaniline production tail gas reach the bottom of the baffle plate and the inside of the hot water at the same time, intercepts the o-nitroaniline production tail gas through the baffle plate, and improves the absorption time of the o-nitroaniline production tail gas, starts the motor one, and drives the stirring rod to rotate, so that the stirring rod drives the hot water inside the water tank to rotate, so that the hot water and the o-nitroaniline production tail gas are fully reacted and absorbed, and then the ammonia reaches the through pipe, so that it is driven into the gas distribution pipe and discharged through the multiple groups of gas outlets above the gas distribution pipe, and salt water is added to the salt water tank through the water inlet hole and the water outlet hole, so that the ammonia gas is fully in contact with the salt water, so as to facilitate the o-nitroaniline production tail gas to fully react with the hot water and improve the dissolution efficiency.

[0022] Second, when the inner wall of the water tank needs to be cleaned, the utility model starts the second motor, and the second motor drives the screw rod to rotate, so that the screw rod drives the scraper to move up and down on the inner wall of the water tank, so that the scraper cleans the inner wall of the water tank, thereby achieving the effect of conveniently cleaning the inner wall of the water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a schematic diagram of the internal structure of the water tank and the brine tank of the utility model;

[0025] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the water tank of the present utility model.

[0027] Among them: 1. Water tank; 2. Fan; 3. Delivery pipe; 4. Baffle; 5. Motor 1; 6. Stirring rod; 7. Heating pipe; 8. Through pipe; 9. Brine tank; 10. Air distribution pipe; 11. Cleaning mechanism; 12. Motor 2; 13. Screw; 14. Scraper. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model provides the following technical solutions:

[0030] Embodiment 1

[0031] See also Figure 1-4 A tail gas absorption device in the production process of o-nitroaniline comprises a water tank 1, a fan 2 is fixedly connected above the water tank 1, a delivery pipe 3 is fixedly connected to the air outlet end of the fan 2, a blocking plate 4 is fixedly connected below the delivery pipe 3, a motor 5 is fixedly connected above the water tank 1, a stirring rod 6 is fixedly connected to the output end of the motor 5, a heating pipe 7 is fixedly connected to the surface of the water tank 1, a through pipe 8 is fixedly connected above the water tank 1, a brine tank 9 is fixedly connected to the other end of the through pipe 8, an air distribution pipe 10 is fixedly connected below the through pipe 8, and a cleaning mechanism 11 is fixedly connected to the inner wall of the water tank 1.

[0032] Specifically, water inlet holes are provided above the surface of the water tank 1 and the salt water tank 9 , water outlet holes are provided below the surface, and an air outlet hole is provided above the salt water tank 9 .

[0033] Specifically, the delivery pipe 3 and the baffle plate 4 are both located on the inner wall of the water tank 1 , and a plurality of groups of scattered holes are provided on the surface of the baffle plate 4 .

[0034] Specifically, the stirring rod 6 is located above the blocking plate 4 , and a plurality of gas outlet holes are provided above the gas distribution pipe 10 .

[0035] According to the above technical scheme, by starting the fan 2, which is a prior art and will not be described in detail, the fan 2 drives the o-nitroaniline production tail gas to reach the inner wall of the conveying pipe 3, and water is added to the inside of the water tank 1 through the water inlet hole, and the heating tube 7 is started. The heating tube 7 is a prior art and will not be described in detail here, and the water inside the water tank 1 is heated, so that the o-nitroaniline production tail gas reaches the bottom of the baffle plate 4 and reaches the inside of the hot water at the same time. The o-nitroaniline production tail gas is intercepted by the baffle plate 4, and the absorption time of the o-nitroaniline production tail gas is increased, and the motor 5 is started. The internal circuit connection of the motor 5 is a prior art and will not be described in detail here. The motor 5 drives the stirring rod 6 to rotate, and the stirring rod 6 drives the hot water inside the water tank 1 to rotate, so that the hot water and the tail gas produced by o-nitroaniline are fully reacted and absorbed, and then reach the through pipe 8 through the ammonia gas, so that it is driven into the gas distribution pipe 10 and discharged through the multiple groups of gas outlets above the gas distribution pipe 10. Salt water is added to the salt water tank 9 through the water inlet and outlet holes, so that the ammonia gas is fully in contact with the salt water, so as to facilitate the o-nitroaniline production tail gas and hot water to fully react and improve the dissolution efficiency.

[0036] Embodiment 2

[0037] See also Figure 1-4 On the basis of the first embodiment, it is further obtained that the cleaning mechanism 11 includes a second motor 12, a screw rod 13 is fixedly connected to the output end of the second motor 12, and a scraper 14 is threadedly connected to the surface of the screw rod 13.

[0038] Specifically, the motor 2 12 is fixedly connected above the water tank 1 , and the screw rod 13 is rotatably connected to the inner wall of the water tank 1 .

[0039] Specifically, the scraper 14 is slidably connected to the inner wall of the water tank 1 , and the outer surface of the scraper 14 contacts the inner wall of the water tank 1 .

[0040] Through the above technical scheme, when it is necessary to clean the inner wall of the water tank 1, start the motor 2 12. The internal circuit connection of the motor 2 12 is the existing technology and will not be described in detail here. The motor 2 12 drives the screw rod 13 to rotate, so that the screw rod 13 drives the scraper 14 to move up and down on the inner wall of the water tank 1, so that the scraper 14 cleans the inner wall of the water tank 1, thereby achieving the effect of facilitating the cleaning of the inner wall of the water tank 1.

[0041] Although specific 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 variations may be made to these specific embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tail gas absorption device in the production process of o-nitroaniline, comprising a water tank (1), characterized in that: A fan (2) is fixedly connected to the top of the water tank (1), a delivery pipe (3) is fixedly connected to the air outlet end of the fan (2), a blocking plate (4) is fixedly connected to the bottom of the delivery pipe (3), a motor (5) is fixedly connected to the top of the water tank (1), a stirring rod (6) is fixedly connected to the output end of the motor (5), a heating pipe (7) is fixedly connected to the surface of the water tank (1), a through pipe (8) is fixedly connected to the top of the water tank (1), the other end of the through pipe (8) is fixedly connected to a brine tank (9), an air distribution pipe (10) is fixedly connected to the bottom of the through pipe (8), and a cleaning mechanism (11) is fixedly connected to the inner wall of the water tank (1).

2. The tail gas absorption device in the o-nitroaniline production process according to claim 1, characterized in that: The water tank (1) and the salt water tank (9) are both provided with water inlet holes on the upper surfaces and water outlet holes on the lower surfaces, and the salt water tank (9) is provided with an air outlet hole on the upper surface.

3. The tail gas absorption device in the o-nitroaniline production process according to claim 1, characterized in that: The delivery pipe (3) and the blocking plate (4) are both located on the inner wall of the water tank (1), and a plurality of groups of scattered holes are provided on the surface of the blocking plate (4).

4. The tail gas absorption device in the o-nitroaniline production process according to claim 1, characterized in that: The stirring rod (6) is located above the blocking plate (4), and a plurality of groups of air outlet holes are provided above the air distribution pipe (10).

5. The tail gas absorption device in the production process of o-nitroaniline according to claim 1, characterized in that: The cleaning mechanism (11) comprises a second motor (12), the output end of the second motor (12) is fixedly connected to a screw rod (13), and the surface of the screw rod (13) is threadedly connected to a scraper (14).

6. The tail gas absorption device in the production process of o-nitroaniline according to claim 5, characterized in that: The second motor (12) is fixedly connected to the top of the water tank (1), and the screw rod (13) is rotatably connected to the inner wall of the water tank (1).

7. The tail gas absorption device in the o-nitroaniline production process according to claim 5, characterized in that: The scraper (14) is slidably connected to the inner wall of the water tank (1), and the outer surface of the scraper (14) contacts the inner wall of the water tank (1).

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