Tail gas treatment box for 2-chloro-3-cyanopyridine production

Abstract

The utility model discloses a tail gas treatment box for 2-chloro-3-cyanopyridine production. The tail gas treatment box comprises a main body structure, the main body structure comprises a filter box and an absorption box, the upper ends of the filter box and the absorption box are communicated through a connecting pipe, a box cover is mounted on one side of the filter box, an air inlet pipe is arranged on the outer wall of the box cover, and an air outlet pipe is arranged at the upper end of the outer wall of one side of the absorption box; the filtering mechanism is arranged in the filtering box; the filtering mechanism comprises a fixing frame and a filter material plate, a clamping groove is formed in one side of the fixing frame, and the filter material plate is clamped in the clamping groove; the absorption mechanism is arranged on the absorption box; the absorption mechanism comprises a solution box and a pump body which are arranged at the top of the absorption box, and the lower end of the conveying pipe extends into the absorption box and is connected with a spray head. Large-particle impurities and harmful substances existing in the tail gas can be removed to a certain extent, and the situation that the environment and monitoring of workers are harmed due to direct emission of untreated tail gas is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of 2-chloro-3-cyanopyridine production tail gas treatment equipment, in particular to a 2-chloro-3-cyanopyridine production tail gas treatment box. Background Art

[0002] 2-Chloro-3-cyanopyridine is a pyridine compound with good chemical transformation activity. It is widely used as an organic synthesis intermediate and pharmaceutical chemical raw material. In terms of chemical properties, 2-chloro-3-cyanopyridine is sensitive to oxidants. The chlorine atom in its structure can undergo a dechlorination functionalization reaction under the attack of a strong nucleophilic reagent, which is used to introduce an amino or alkyl alcohol unit at the second position. At the same time, the cyano group in the structure can undergo reduction reaction, hydrolysis reaction, and condensation reaction with amino alcohols. These properties make it widely used in the preparation of pyridine derivatives. In the pharmaceutical field, 2-chloro-3-cyanopyridine is mainly used in the synthesis of drug molecules such as mirtazapine and nevirapine. Mirtazapine is a norepinephrine and specific 5-hydroxytryptamine antidepressant, mainly used to treat depression.

[0003] After searching, the Chinese patent application number is: CN202020513281.1 involving a 2 - chlorine - 3 - The invention discloses a cyanopyridine preparation device, which improves the dissolution rate between a substance and an organic solvent, increases work efficiency, improves adaptability, and reduces limitations in use; the device comprises a support seat, an electric-controlled heater, a reaction box, an addition port, a water outlet, and a water outlet valve, wherein the bottom end of the electric-controlled heater is fixedly mounted on the top end of the support seat, the bottom end of the reaction box is connected to the top end of the electric-controlled heater, the left input end of the water outlet is connected to the bottom output end of the reaction box, and the left end of the water outlet valve is connected to the output end of the water outlet; the device also comprises a motor, a reducer, a shaft sleeve, and a stirring shaft, wherein the bottom end of the motor is connected to the top end of the support seat, the bottom end of the reducer is connected to the top end of the support seat, the output end of the motor is coaxially connected to the input end of the reducer, the top end of the stirring shaft is coaxially connected to the output end of the reducer, a plurality of stirring paddles are arranged on the stirring shaft, and the shaft sleeve is fixedly mounted at the connection between the stirring shaft and the stirring paddles.

[0004] The above technical solution lacks a tail gas treatment mechanism when preparing 2-chloro-3-cyanopyridine. If the tail gas generated during the preparation process is not treated by a special treatment mechanism, it is easy to cause adverse effects on the environment and the health of workers. Therefore, we need to propose a 2-chloro-3-cyanopyridine production tail gas treatment box. Utility Model Content

[0005] The purpose of the utility model is to provide a 2-chloro-3-cyanopyridine production tail gas treatment box. The device has a simple structure and is easy to use. It can filter and absorb the tail gas generated by the preparation of 2-chloro-3-cyanopyridine, and can remove large particle impurities and harmful substances in the tail gas to a certain extent, avoiding the direct discharge of untreated tail gas to cause harm to the environment and the monitoring of staff, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A 2-chloro-3-cyanopyridine production tail gas treatment box, comprising:

[0008] Main structure;

[0009] The main structure includes a filter box and an absorption box, the upper ends of the filter box and the absorption box are connected through a connecting pipe, a box cover is installed on one side of the filter box, an air inlet pipe is arranged on the outer wall of the box cover, and an air outlet pipe is arranged on the upper end of the outer wall of one side of the absorption box;

[0010] A filter mechanism disposed in the filter box;

[0011] The filter mechanism comprises a fixed frame and a filter plate, the fixed frame is welded to the inner wall of the filter box, a slot is provided on one side of the fixed frame, and the filter plate is clipped into the slot;

[0012] An absorption mechanism disposed on the absorption box;

[0013] The absorption mechanism includes a solution box and a pump body arranged on the top of the absorption box. The pump body is used to extract solution from the solution box to neutralize and absorb the tail gas. The liquid outlet end of the pump body is fixedly connected to a delivery pipe, and the lower end of the delivery pipe extends to the interior of the absorption box and is connected to a nozzle.

[0014] Preferably, a first peripheral edge is integrally formed at one end of the opening of the filter box, and a second peripheral edge is correspondingly provided on the box cover.

[0015] Preferably, a threaded column is welded on the first surrounding edge, and a through hole is correspondingly opened on the second surrounding edge, and the first surrounding edge is fixedly connected to the second surrounding edge through the threaded column and a nut.

[0016] Preferably, a sealing strip is arranged around the first surrounding edge, and a sealing groove is opened around the side wall of the second surrounding edge, and the sealing strip and the sealing groove correspond to each other.

[0017] Preferably, it also includes a positioning mechanism for positioning the filter plate, the positioning mechanism includes a pressing plate, a connecting rod and a sleeve, the connecting rod is welded to the side wall of the pressing plate, and the sleeve is welded to the inner wall of the box cover.

[0018] Preferably, the connecting rod is slidably inserted into the inner cavity of the sleeve, and a limiting block is provided at the end of the connecting rod. A compression spring is provided in the inner cavity of the sleeve, and both ends of the compression spring respectively abut against the inner wall of the sleeve and the side wall of the limiting block.

[0019] Preferably, a waste liquid hopper is provided at the bottom of the absorption box, the waste liquid hopper is arranged in a funnel shape, and a drain pipe is provided at the bottom of the waste liquid hopper.

[0020] Preferably, a partition is provided on the inner wall of the absorption box between the nozzle and the gas outlet pipe, and the lower end of the partition is located at the bottom of the absorption box and has a gap for gas to pass through.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] The utility model is provided with a main structure including a filter box and an absorption box, the filter box and the absorption box are connected through a connecting pipe, a box cover with an air inlet pipe is installed on the filter box, an air outlet pipe is arranged on the absorption box, a filtering mechanism including a fixed frame and a filter material plate is arranged in the filter box, and an absorption mechanism including a solution box and a pump body is arranged on the absorption box. The utility model has a simple structure and is easy to use, can filter and absorb the tail gas generated by the preparation of 2-chloro-3-cyanopyridine, can remove large particle impurities and harmful substances in the tail gas to a certain extent, and avoids direct discharge of untreated tail gas to cause harm to the environment and the monitoring of staff. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 It is a structural schematic diagram of the main structure of the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the filter mechanism of the utility model;

[0026] Figure 4 It is a structural schematic diagram of the pressing plate of the utility model.

[0027] In the figure: 1. filter box; 2. absorption box; 3. connecting pipe; 4. box cover; 5. air inlet pipe; 6. air outlet pipe; 7. filter plate; 8. solution box; 9. nozzle; 10. waste liquid bucket; 11. drain pipe; 12. first surrounding edge; 13. second surrounding edge; 14. threaded column; 15. through hole; 16. sealing strip; 17. sealing groove; 18. fixing frame; 19. slot; 20. pressure plate; 21. connecting rod; 22. sleeve; 23. compression spring; 24. pump body; 25. partition. 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] See also Figure 2 , the utility model provides a technical solution:

[0030] A 2-chloro-3-cyanopyridine production tail gas treatment box, comprising:

[0031] The main structure includes a filter box 1 and an absorption box 2. The upper ends of the filter box 1 and the absorption box 2 are connected through a connecting pipe 3. A box cover 4 is installed on one side of the filter box 1. An air inlet pipe 5 is arranged on the outer wall of the box cover 4. An air outlet pipe 6 is arranged on the upper end of the outer wall of one side of the absorption box 2.

[0032] A filter mechanism is provided in the filter box 1; the filter mechanism comprises a fixing frame 18 and a filter plate 7, the fixing frame 18 is welded to the inner wall of the filter box 1, a slot 19 is provided on one side of the fixing frame 18, and the filter plate 7 is snapped into the inside of the slot 19;

[0033] The absorption mechanism is arranged on the absorption box 2; the absorption mechanism includes a solution box 8 and a pump body 24 arranged on the top of the absorption box 2. The pump body 24 is used to extract the solution in the solution box 8 to neutralize and absorb the tail gas. The liquid outlet of the pump body 24 is fixedly connected with a delivery pipe, and the lower end of the delivery pipe extends to the inside of the absorption box 2 and is connected with a nozzle 9. A waste liquid hopper 10 is arranged at the bottom of the absorption box 2. The waste liquid hopper 10 is arranged in a funnel shape, and a drain pipe 11 is arranged at the bottom of the waste liquid hopper 10.

[0034] By setting up a main structure including a filter box 1 and an absorption box 2, the filter box 1 and the absorption box 2 are connected through a connecting pipe 3, a box cover 4 with an air inlet pipe 5 is installed on the filter box 1, an air outlet pipe 6 is arranged on the absorption box 2, a filtering mechanism including a fixing frame 18 and a filter plate 7 is arranged in the filter box 1, and an absorption mechanism including a solution box 8 and a pump body 24 is arranged on the absorption box 2. In actual use, the exhaust gas emission pipeline prepared by 2-chloro-3-cyanopyridine is connected through the air inlet pipe 5. After the exhaust gas enters the filter box 1, it is filtered by the filtering mechanism and then enters the interior of the absorption box 2 through the connecting pipe 3. The pump body 24 draws the solution in the solution box 8 and sprays it out through the nozzle 9 to neutralize and absorb the exhaust gas. The exhaust gas after filtration and neutralization is discharged through the air outlet pipe 6, thereby achieving the purpose of treating the exhaust gas.

[0035] In general, the device has a simple structure and is easy to use. It can filter and absorb the tail gas generated by the preparation of 2-chloro-3-cyanopyridine, and can remove large particle impurities and harmful substances in the tail gas to a certain extent, avoiding direct discharge of untreated tail gas to cause harm to the environment and monitoring of staff.

[0036] The filter plate 7 is a porous activated carbon mesh plate, which can filter out large particles of impurities in the exhaust gas;

[0037] The solution in the solution tank 8 is composed of water, alkali solution (such as sodium hydroxide solution), and organic solvent (such as alcohols, esters, etc.), which can react chemically or physically adsorb with harmful gases in the exhaust gas, thereby removing the harmful gases from the exhaust gas.

[0038] For example, if the tail gas contains acidic gases (such as sulfur dioxide, hydrogen sulfide, etc.), alkali solution can be used as the absorption liquid to convert the acidic gases into harmless salts through acid-base neutralization reaction. If the tail gas contains harmful gases soluble in water (such as hydrogen chloride, ammonia, etc.), water can be used as the absorption liquid to remove the harmful gases from the tail gas through dissolution.

[0039] For further information, see Figure 3 :

[0040] The filter box 1 has a first peripheral edge 12 integrally formed at one end of the opening, and a second peripheral edge 13 is correspondingly provided on the box cover 4. A threaded column 14 is welded on the first peripheral edge 12, and a through hole 15 is correspondingly provided on the second peripheral edge 13. The first peripheral edge 12 is fixedly connected to the second peripheral edge 13 through the threaded column 14 and a nut. A sealing strip 16 is provided around the first peripheral edge 12, and a sealing groove 17 is provided around the side wall of the second peripheral edge 13, and the sealing strip 16 corresponds to the sealing groove 17.

[0041] By providing a first surrounding edge 12 with a threaded column 14 and a sealing strip 16 on the filter box 1, and providing a second surrounding edge 13 with a through hole 15 and a sealing groove 17 on the box cover 4, the threaded column 14 and the through hole 15 correspond one to one, so that the box cover 4 can be quickly positioned when it is installed, and can be locked by a nut;

[0042] The sealing strip 16 corresponds to the sealing groove 17, and can play a good sealing role after the box cover 4 is installed to prevent the exhaust gas from overflowing;

[0043] It is also convenient for quick installation, use, disassembly and replacement of the filter plate.

[0044] Also, see Figure 4 :

[0045] It also includes a positioning mechanism for positioning the filter plate 7, which includes a pressing plate 20, a connecting rod 21 and a sleeve 22. The connecting rod 21 is welded to the side wall of the pressing plate 20, and the sleeve 22 is welded to the inner wall of the box cover 4. The connecting rod 21 is slidably inserted into the inner cavity of the sleeve 22, and a limit block is provided at the end of the connecting rod 21. A compression spring 23 is provided in the inner cavity of the sleeve 22, and the two ends of the compression spring 23 are respectively against the inner wall of the sleeve 22 and the side wall of the limit block.

[0046] By setting a positioning mechanism including a pressing plate 20, a connecting rod 21 and a sleeve 22, when the filter plate 7 is installed, the filter plate 7 is placed in the slot 19 of the fixed frame 18, and then the box cover 4 is installed. Under the action of the connecting rod 21, the pressing plate 20, the sleeve 22 and the compression spring 23, the pressing plate 20 is only attached to one side of the filter plate 7, and the filter plate 7 is pressed into the slot 19, so that the filter plate 7 will not be easily displaced, and the gap between the filter plate 7 and the fixed frame 18 is avoided, thereby improving the filtering capacity.

[0047] It is worth mentioning that see Figure 2 :

[0048] The inner wall of the absorption box 2 is provided with a partition 25 between the nozzle 9 and the gas outlet pipe 6. The lower end of the partition 25 is located at the bottom of the absorption box 2 and has a gap for gas to pass through.

[0049] By setting a partition 25 on the inner wall of the absorption box 2, after the exhaust gas enters the absorption box 2, the nozzle 9 sprays the solution for neutralization. The partition 25 can prevent the gas from being discharged directly through the outlet pipe 6. The exhaust gas must pass through the notch at the lower end of the partition 25 before it can be discharged. In this process, the contact time between the exhaust gas and the solution spray can be extended, thereby improving the absorption and neutralization capacity of the exhaust gas.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A 2-chloro-3-cyanopyridine production tail gas treatment box, characterized in that: include: Main structure; The main structure comprises a filter box (1) and an absorption box (2); the upper ends of the filter box (1) and the absorption box (2) are connected via a connecting pipe (3); a box cover (4) is installed on one side of the filter box (1); an air inlet pipe (5) is arranged on the outer wall of the box cover (4); and an air outlet pipe (6) is arranged on the upper end of the outer wall of one side of the absorption box (2); A filtering mechanism arranged in the filter box (1); The filtering mechanism comprises a fixing frame (18) and a filter plate (7); the fixing frame (18) is welded to the inner wall of the filter box (1); a clamping groove (19) is provided on one side of the fixing frame (18); and the filter plate (7) is clamped inside the clamping groove (19); An absorption mechanism arranged on the absorption box (2); The absorption mechanism comprises a solution box (8) and a pump body (24) arranged on the top of the absorption box (2); the pump body (24) is used to extract the solution in the solution box (8) to neutralize and absorb the tail gas; the liquid outlet end of the pump body (24) is fixedly connected to a delivery pipe; the lower end of the delivery pipe extends to the interior of the absorption box (2) and is connected to a nozzle (9).

2. A 2-chloro-3-cyanopyridine production tail gas treatment box according to claim 1, characterized in that: A first peripheral edge (12) is integrally formed at one end of the opening of the filter box (1), and a second peripheral edge (13) is correspondingly provided on the box cover (4).

3. A 2-chloro-3-cyanopyridine production tail gas treatment box according to claim 2, characterized in that: A threaded column (14) is welded on the first surrounding edge (12), and a through hole (15) is correspondingly opened on the second surrounding edge (13). The first surrounding edge (12) is fixedly connected to the second surrounding edge (13) through the threaded column (14) and a nut.

4. A 2-chloro-3-cyanopyridine production tail gas treatment box according to claim 3, characterized in that: A sealing strip (16) is arranged around the first surrounding edge (12), and a sealing groove (17) is arranged around the side wall of the second surrounding edge (13), and the sealing strip (16) and the sealing groove (17) correspond to each other.

5. A 2-chloro-3-cyanopyridine production tail gas treatment box according to claim 1, characterized in that: It also includes a positioning mechanism for positioning the filter plate (7), the positioning mechanism including a pressing plate (20), a connecting rod (21) and a sleeve (22), the connecting rod (21) being welded to the side wall of the pressing plate (20), and the sleeve (22) being welded to the inner wall of the box cover (4).

6. A 2-chloro-3-cyanopyridine production tail gas treatment box according to claim 5, characterized in that: The connecting rod (21) is slidably inserted into the inner cavity of the sleeve (22), and a limit block is arranged at the end of the connecting rod (21). A compression spring (23) is arranged in the inner cavity of the sleeve (22), and the two ends of the compression spring (23) respectively contact the inner wall of the sleeve (22) and the side wall of the limit block.

7. A 2-chloro-3-cyanopyridine production tail gas treatment box according to claim 1, characterized in that: A waste liquid hopper (10) is arranged at the bottom of the absorption box (2); the waste liquid hopper (10) is arranged in a funnel shape; and a drainage pipe (11) is arranged at the bottom of the waste liquid hopper (10).

8. A 2-chloro-3-cyanopyridine production tail gas treatment box according to claim 1, characterized in that: The inner wall of the absorption box (2) is provided with a partition (25) between the nozzle (9) and the gas outlet pipe (6), and the lower end of the partition (25) is located at the bottom of the absorption box (2) and has a gap for gas to pass through.

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