Treatment device for malononitrile reaction tail gas

Abstract

The utility model relates to the technical field of tail gas treatment, and discloses a malononitrile reaction tail gas treatment device which comprises a treatment box and a catalysis box, one side of the treatment box is provided with a first through hole, the inner wall of the first through hole is fixedly connected with a gas inlet pipe, and the inner side of the treatment box is slidably provided with an activated carbon filter element; a first sealing plate is mounted on one side of the activated carbon filter element through bolts, a first rectangular movable opening is formed in one side of the treatment box, and the first sealing plate is attached to the inner wall of the first rectangular movable opening. According to the device, tail gas can be conveniently adsorbed through activated carbon, gas adsorbed by the activated carbon filter element enters the catalysis box through the gas conveying pipe, and before the activated carbon filter element is used for adsorbing reaction tail gas, the service life of the activated carbon filter element can be prolonged by spraying and neutralizing the tail gas; the activated carbon filter element does not need to be frequently replaced, so that the cost is reduced, and the device is relatively practical and suitable for wide popularization and use.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment, and specifically relates to a treatment device for the reaction tail gas of malononitrile. Background Art

[0002] Malononitrile is an organic compound, soluble in water, ethanol, benzene, slightly soluble in chloroform, acetic acid. As an important organic chemical raw material, malononitrile is used to produce various organic products, and can also be used in the fields of medicine, pesticides, agriculture, coatings, new energy, automobiles, etc.

[0003] During the production reaction of malononitrile, a large amount of tail gas will volatilize. If directly discharged into the air environment, it will pollute the air quality. In order to treat the volatilized tail gas, the currently widely used method is the activated carbon adsorption method. Its principle is to use activated carbon to adsorb the reaction tail gas. This method is simple to operate and has a high treatment efficiency, but the activated carbon needs to be replaced frequently, resulting in a high cost. In view of this, the present utility model specifically provides a treatment device for the reaction tail gas of malononitrile to solve the above problems. Summary of the Utility Model

[0004] In order to solve the technical problem that the activated carbon needs to be replaced frequently and the cost is high when using the activated carbon adsorption method to treat the reaction tail gas, the basic concept of the technical solution adopted by the present utility model is as follows:

[0005] A treatment device for the reaction tail gas of malononitrile includes a treatment box and a catalytic box. A first through hole is opened on one side of the treatment box, and an air inlet pipe is fixedly connected to the inner wall of the first through hole. An activated carbon filter element is slidably installed inside the treatment box. A first sealing plate is installed on one side of the activated carbon filter element through bolts. A first rectangular movable opening is opened on one side of the treatment box, and the first sealing plate fits with the inner wall of the first rectangular movable opening. A liquid collecting box is slidably installed on the inner bottom wall of the treatment box. A second sealing plate is fixedly connected to one side of the liquid collecting box. A second rectangular movable opening is opened on one side of the treatment box, and the second sealing plate fits with the inner wall of the second rectangular movable opening. The outer walls of one sides of the first sealing plate and the second sealing plate are fixedly connected to the same connecting plate. A liquid collecting pipe is fixedly connected to one side inner wall of the treatment box. The liquid collecting pipe is located below the activated carbon filter element. A plurality of spray heads are installed at equal intervals at the bottom of the liquid collecting pipe. The end position of the liquid collecting pipe extends to the outside of the treatment box, and an infusion pipe is fixedly connected to the end position of the liquid collecting pipe.

[0006] As a preferred embodiment of the present utility model, a top plate is fixedly installed on the top of the treatment box, and an air delivery pipe is fixedly installed on the top plate. The air delivery pipe is communicated with the catalytic box.

[0007] As a preferred embodiment of the present utility model, a rotating shaft is rotatably installed on the inner wall of the bottom of the catalytic box, and stirring rods are fixedly connected to the outer wall of the rotating shaft and are arranged equidistantly in a surrounding manner.

[0008] As a preferred embodiment of the present utility model, a top cover is fixedly installed on the top of the catalytic box, a protective shell is fixedly connected to the middle of the top of the top cover, a driving motor is fixedly installed inside the protective shell, and the output shaft of the driving motor is connected to the top end of the rotating shaft through a coupling.

[0009] As a preferred embodiment of the present utility model, a feed pipe is arranged on one side of the top of the top cover, and the feed pipe is communicated with the catalytic box.

[0010] As a preferred embodiment of the present utility model, symmetrically arranged installation grooves are formed on the inner wall of the bottom of the catalytic box, and electric heating plates and heat conducting plates are fixedly connected to the inner walls of the installation grooves. The heat conducting plates are in contact with the electric heating plates, and the tops of the heat conducting plates are flush with the inner wall of the bottom of the catalytic box.

[0011] As a preferred embodiment of the present utility model, a drain pipe is arranged on one side of the bottom of the catalytic box, and a valve is arranged on the drain pipe. A second through hole is formed on one side of the top of the catalytic box, and an air outlet pipe is fixedly connected to the inner wall of the second through hole.

[0012] The present utility model has the following beneficial effects compared with the prior art:

[0013] In the present utility model, the tail gas generated during the production reaction of malononitrile enters the treatment box through the intake pipe. Connect the infusion pipe to an external liquid supply device so that the alkaline solution can be input into the liquid collecting pipe through the infusion pipe and sprayed into the treatment box through the spray head, enabling spray neutralization treatment of the tail gas. The liquid after spray treatment falls into the liquid collecting box, and the gas flows upward. When the gas flows to the activated carbon filter element, it is convenient to adsorb the tail gas through the activated carbon. Before the gas is adsorbed by the activated carbon filter element after adsorption treatment, spray neutralization treatment of the tail gas can extend the service life of the activated carbon filter element, eliminating the need for frequent replacement of the activated carbon filter element, reducing costs. After the activated carbon filter element has been used for a long time, pull the connecting plate to move to one side. The connecting plate drives the first sealing plate and the second sealing plate to move to one side. The first sealing plate drives the activated carbon filter element to move to the outside of the treatment box, facilitating replacement of the activated carbon filter element. The second sealing plate drives the liquid collecting box to move to the outside of the treatment box, facilitating treatment of the collected solution.

[0014] The following further describes in detail the specific embodiments of the present utility model with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the accompanying drawings:

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a schematic side view structure diagram of the present utility model;

[0018] Figure 3 is a schematic cross-sectional structure diagram of the treatment box of the present utility model;

[0019] Figure 4 is a schematic cross-sectional structure diagram of the catalytic box of the present utility model;

[0020] Figure 5 is a schematic side view cross-sectional structure diagram of the catalytic box of the present utility model.

[0021] In the figure: 1. Treatment box; 2. Catalytic box; 3. Top plate; 4. Air delivery pipe; 5. Air inlet pipe; 6. Liquid delivery pipe; 7. First sealing plate; 8. Second sealing plate; 9. Connecting plate; 10. Top cover; 11. Feed pipe; 12. Protective housing; 13. Drain pipe; 14. Air outlet pipe; 15. Activated carbon filter element; 16. Liquid collecting pipe; 17. Spray head; 18. Liquid collecting box; 19. Rotating shaft; 20. Stirring rod; 21. Electric heating plate; 22. Heat conducting plate; 23. Driving motor. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model.

[0023] As Figures 1 to 5 shown

[0024] A treatment device for the reaction tail gas of malononitrile, comprising a treatment box 1 and a catalytic box 2. A first through hole is formed on one side of the treatment box 1, and an air inlet pipe 5 is fixedly connected to the inner wall of the first through hole. The tail gas generated during the production reaction of malononitrile enters the treatment box 1 through the air inlet pipe 5. An activated carbon filter element 15 is slidably installed inside the treatment box 1. A first sealing plate 7 is installed on one side of the activated carbon filter element 15 through bolts. A first rectangular movable opening is formed on one side of the treatment box 1, and the first sealing plate 7 fits against the inner wall of the first rectangular movable opening. A liquid collecting box 18 is slidably installed on the bottom inner wall of the treatment box 1. A second sealing plate 8 is fixedly connected to one side of the liquid collecting box 18. A second rectangular movable opening is formed on one side of the treatment box 1, and the second sealing plate 8 fits against the inner wall of the second rectangular movable opening. The outer walls of one side of the first sealing plate 7 and the second sealing plate 8 are fixedly connected to the same connecting plate 9. When the activated carbon filter element 15 has been used for a long time, pull the connecting plate 9 to move to one side. The connecting plate 9 drives the first sealing plate 7 and the second sealing plate 8 to move to one side. The first sealing plate 7 drives the activated carbon filter element 15 to move to the outside of the treatment box 1, facilitating the replacement of the activated carbon filter element 15. The second sealing plate 8 drives the liquid collecting box 18 to move to the outside of the treatment box 1, facilitating the treatment of the collected solution. A liquid collecting pipe 16 is fixedly connected to one side inner wall of the treatment box 1. The liquid collecting pipe 16 is located below the activated carbon filter element 15. A plurality of spray heads 17 are installed at equal intervals at the bottom of the liquid collecting pipe 16. The end position of the liquid collecting pipe 16 extends to the outside of the treatment box 1, and a liquid infusion pipe 6 is fixedly connected to the end position of the liquid collecting pipe 16. Connect the liquid infusion pipe 6 to an external liquid supply device, so that the alkaline solution can be input into the liquid collecting pipe 16 through the liquid infusion pipe 6 and sprayed into the treatment box 1 through the spray heads 17, enabling the tail gas to be spray-neutralized. The liquid after the spray treatment falls into the liquid collecting box 18, and the gas flows upward. When the gas flows to the activated carbon filter element 15, it is convenient for the activated carbon to adsorb the tail gas. A top plate 3 is fixedly installed on the top of the treatment box 1. An air outlet pipe 4 is fixedly installed on the top plate 3. The air outlet pipe 4 is communicated with the catalytic box 2. The gas after being adsorbed and treated by the activated carbon filter element 15 enters the catalytic box 2 through the air outlet pipe 4.

[0025] In a specific embodiment, a rotating shaft 19 is rotatably installed on the bottom inner wall of the catalytic box 2. A plurality of stirring rods 20 arranged at equal intervals are fixedly connected to the outer wall of the rotating shaft 19. A top cover 10 is fixedly installed on the top of the catalytic box 2. A feed pipe 11 is arranged on one side of the top of the top cover 10. The feed pipe 11 is communicated with the catalytic box 2. It is convenient to inject water and catalyst into the catalytic box 2 through the feed pipe 11 arranged at the top of the catalytic box 2. A protective housing 12 is fixedly connected to the middle of the top of the top cover 10. A driving motor 23 is fixedly installed inside the protective housing 12. The output shaft of the driving motor 23 is connected to the top end of the rotating shaft 19 through a coupling. After the water and catalyst are added, start the driving motor 23 to drive the rotating shaft 19 to rotate. The rotating shaft 19 drives the stirring rods 20 to mix and stir the water and catalyst, so as to form a catalytic mixture.

[0026] Further, symmetrically arranged mounting grooves are formed in the inner wall of the bottom of the catalytic box 2, and an electric heating plate 21 and a heat conducting plate 22 are fixedly connected to the inner walls of the mounting grooves. The heat conducting plate 22 is in contact with the electric heating plate 21, and the top of the heat conducting plate 22 is flush with the inner wall of the bottom of the catalytic box 2. When the two electric heating plates 21 are turned on to work, the heat generated by the electric heating plates 21 is transferred to the mixed liquid through the heat conducting plate 22, which can heat the mixed liquid, facilitating the oxidation and decomposition of the organic matter in the residual tail gas into carbon dioxide and water. A drain pipe 13 is provided on one side of the bottom of the catalytic box 2, and a valve is provided on the drain pipe 13. A second through hole is formed on one side of the top of the catalytic box 2, and an air outlet pipe 14 is fixedly connected to the inner wall of the second through hole. The carbon dioxide gas after decomposition is discharged into the external environment through the air outlet pipe 14. Then, the valve on the drain pipe 13 is opened, so that the treated waste water can be discharged through the drain pipe 13.

[0027] The implementation principle of the treatment device for the reaction tail gas of malononitrile in this embodiment is as follows:

[0028] During specific use, the tail gas generated during the production reaction of malononitrile enters the treatment box 1 through the air inlet pipe 5. Connect the infusion pipe 6 to an external liquid supply device, so that the alkaline solution can be input into the liquid collecting pipe 16 through the infusion pipe 6 and sprayed into the treatment box 1 through the spray head 17, which can spray and neutralize the tail gas. The liquid after the spray treatment falls into the liquid collecting box 18, and the gas flows upward. When the gas flows to the activated carbon filter element 15, it is convenient to adsorb the tail gas through the activated carbon. The gas after being adsorbed by the activated carbon filter element 15 enters the catalytic box 2 through the gas transmission pipe 4. It is convenient to inject water and catalyst into the catalytic box 2 through the feed pipe 11 arranged at the top of the catalytic box 2. After the water and catalyst are added, start the driving motor 23 to drive the rotating shaft 19 to rotate, and the rotating shaft 19 drives the stirring rod 20 to mix and stir the water and catalyst, so as to form a catalytic mixed liquid. Then, turn on the two electric heating plates 21 to work. The heat generated by the electric heating plates 21 is transferred to the mixed liquid through the heat conducting plate 22, which can heat the mixed liquid, facilitating the oxidation and decomposition of the organic matter in the residual tail gas into carbon dioxide and water. The carbon dioxide gas after decomposition is discharged into the external environment through the air outlet pipe 14. Then, open the valve on the drain pipe 13, so that the treated waste water can be discharged through the drain pipe 13. When the activated carbon filter element 15 has been used for a long time, pull the connecting plate 9 to move to one side, and the connecting plate 9 drives the first sealing plate 7 and the second sealing plate 8 to move to one side. The first sealing plate 7 drives the activated carbon filter element 15 to move to the outside of the treatment box 1, facilitating the replacement of the activated carbon filter element 15. The second sealing plate 8 drives the liquid collecting box 18 to move to the outside of the treatment box 1, facilitating the treatment of the collected solution.

Claims

1. A device for treating tail gas from a malononitrile reaction, comprising a treatment box (1) and a catalyst box (2), characterized in that: A first through hole is provided on one side of the treatment box (1), and an air intake pipe (5) is fixedly connected to the inner wall of the first through hole; an activated carbon filter element (15) is slidably mounted on the inner side of the treatment box (1); a first sealing plate (7) is mounted on one side of the activated carbon filter element (15) via bolts; a first rectangular movable opening is provided on one side of the treatment box (1), and the first sealing plate (7) is fitted with the inner wall of the first rectangular movable opening; a liquid collecting box (18) is slidably mounted on the inner wall of the bottom of the treatment box (1), and a second sealing plate (8) is fixedly connected to one side of the liquid collecting box (18); and one side of the treatment box (1) A second rectangular movable opening is provided, and a second sealing plate (8) is fitted with the inner wall of the second rectangular movable opening; the outer walls of one side of the first sealing plate (7) and the second sealing plate (8) are fixedly connected to the same connecting plate (9); the inner wall of one side of the treatment box (1) is fixedly connected to a liquid collecting pipe (16); the liquid collecting pipe (16) is located below the activated carbon filter element (15); the bottom of the liquid collecting pipe (16) is equipped with equidistantly distributed spray heads (17); the end of the liquid collecting pipe (16) extends to the outside of the treatment box (1); and the end of the liquid collecting pipe (16) is fixedly connected to a liquid infusion pipe (6).

2. A processing device for tail gas from a malononitrile reaction according to claim 1, characterized in that: A top plate (3) is fixedly mounted on the top of the treatment box (1), a gas pipeline (4) is fixedly mounted on the top plate (3), and the gas pipeline (4) is connected to the catalyst box (2).

3. A processing device for tail gas from a malononitrile reaction according to claim 1, characterized in that: A rotating shaft (19) is rotatably mounted on the inner wall of the bottom of the catalyst box (2), and stirring rods (20) arranged equidistantly around the rotating shaft (19) are fixedly connected to the outer wall of the rotating shaft (19).

4. A processing device for tail gas from a malononitrile reaction according to claim 3, characterized in that: A top cover (10) is fixedly mounted on the top of the catalyst box (2); a protective housing (12) is fixedly connected to the middle of the top of the top cover (10); a drive motor (23) is fixedly mounted inside the protective housing (12); an output shaft of the drive motor (23) is connected to the top position of the rotating shaft (19) via a coupling.

5. A processing device for tail gas from a malononitrile reaction according to claim 4, characterized in that: A feed pipe (11) is provided on one side of the top of the top cover (10), and the feed pipe (11) is connected to the catalyst box (2).

6. The processing device for tail gas from a malononitrile reaction according to claim 1, characterized in that: The bottom inner wall of the catalyst box (2) is provided with symmetrically arranged mounting grooves, and the inner walls of the mounting grooves are fixedly connected with an electric heating plate (21) and a heat conducting plate (22), the heat conducting plate (22) is in contact with the electric heating plate (21), and the top of the heat conducting plate (22) is flush with the bottom inner wall of the catalyst box (2).

7. The processing device for tail gas from a malononitrile reaction according to claim 1, characterized in that: A liquid discharge pipe (13) is provided on one side of the bottom of the catalyst box (2), and a valve is provided on the liquid discharge pipe (13). A second through hole is provided on one side of the top of the catalyst box (2), and an air outlet pipe (14) is fixedly connected to the inner wall of the second through hole.

Images