A tail gas treatment device for cyclohexyl isocyanate processing

Abstract

The utility model discloses a kind of tail gas treatment devices for cyclohexyl isocyanate processing, belong to tail gas treatment technical field.A kind of tail gas treatment devices for cyclohexyl isocyanate processing, including recovery tank, intake pipe, intake pipe is connected recovery tank, recovery tank is provided with mixing chamber, cyclohexylamine solution is stored in mixing chamber, intake pipe is used to send tail gas into the cyclohexylamine solution in mixing chamber;The bottom of the recovery tank is provided with a discharge pipe, a valve for controlling opening and closing is arranged at the discharge pipe;Recycling stirring unit for accelerating the mixing speed of tail gas and cyclohexylamine solution in mixing chamber is arranged in the recovery tank;Gas treatment box is arranged at the recovery tank, and a gas pipe for connecting the gas treatment box and the recovery tank is arranged.The utility model provides a kind of tail gas treatment devices for cyclohexyl isocyanate processing, can remove the toxic part in tail gas, the gas after processing has no toxicity, and the above-mentioned processing method does not need additional landfill area requirement.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust gas treatment technology, specifically relating to an exhaust gas treatment device for cyclohexyl isocyanate processing. Background Technology

[0002] Cyclohexyl isocyanate is used as an intermediate in the manufacture of various products, mainly in the synthesis of pesticides or pharmaceuticals. In pesticides, it is used to produce herbicides such as cyclomethazine, and in pharmaceuticals, it is used to produce Western medicines and thiamethoxam technical grade.

[0003] The synthesis of cyclohexyl isocyanate generates tail gas, typically hydrogen chloride and phosgene. Existing technologies employ various methods to treat this tail gas, one of which is landfill treatment. This involves passing the tail gas into concrete, where the cured concrete encapsulates the gas, and then the solidified concrete is buried in the soil. While this method avoids environmental damage, it requires landfill sites and occupies significant land resources. Therefore, this application proposes a tail gas treatment device for cyclohexyl isocyanate processing. Utility Model Content

[0004] The purpose of this invention is to provide a tail gas treatment device for cyclohexyl isocyanate processing, in order to solve the problem of the existing landfill treatment method mentioned in the background art, which involves passing the tail gas into concrete, enclosing the tail gas with the solidified concrete, and then burying the solidified concrete in the soil. Although this method can also avoid the tail gas from damaging the environment, it requires the construction of landfill sites, which has a high demand for land.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tail gas treatment device for cyclohexyl isocyanate processing, comprising a recovery tank and an inlet pipe, the inlet pipe being connected to the recovery tank, a mixing chamber being provided inside the recovery tank, the mixing chamber storing a cyclohexylamine solution, and the inlet pipe being used to send the tail gas into the cyclohexylamine solution in the mixing chamber. The bottom of the recycling tank is equipped with a discharge pipe, and a valve for controlling the opening and closing of the discharge pipe is installed at the discharge pipe; The recovery tank is equipped with a recovery stirring unit to accelerate the mixing speed of the exhaust gas and the cyclohexylamine solution in the mixing chamber. The recovery tank is equipped with a gas processing box and a gas supply pipe connecting the gas processing box and the recovery tank. The gas processing box contains an alkaline solution.

[0006] Preferably, the recycling stirring unit includes a power shaft inserted into the recycling tank, a support seat mounted on the outer wall of the recycling tank and rotatably cooperating with the power shaft, and a drive device.

[0007] Preferably, the drive device is mounted on a support base via a drive motor bracket.

[0008] Preferably, the recycling tank is provided with a stirring rod connected to the power shaft and stirring blades installed on the stirring rod, with the stirring blades located in the mixing chamber.

[0009] Preferably, the outer wall of the recycling tank is provided with three tripods arranged in a circumferential array around the center line of the recycling tank, and the tripods are provided with support legs.

[0010] Preferably, the outriggers are vertically distributed, and a pad is provided at the bottom of each outrigger, the size of which is larger than the size of the outrigger.

[0011] Preferably, the bottom of the gas treatment box is provided with a support base.

[0012] Preferably, the gas treatment box is provided with a gas treatment stirring unit, which includes a power device installed on the gas treatment box, a rotating shaft connected to the power device, and a rotating plate installed on the rotating shaft and located in the alkaline solution inside the gas treatment box.

[0013] Preferably, multiple rotating plates are provided, and the multiple rotating plates are arranged in a circumferential array around the center line of the rotation axis.

[0014] Preferably, an exhaust pipe is provided at the gas treatment box, and a top cover is provided at the top of the gas treatment box, with the exhaust pipe installed on the top cover.

[0015] Beneficial effects: I. This utility model provides a tail gas treatment device for cyclohexyl isocyanate processing. During the synthesis of cyclohexyl isocyanate, tail gas is generated. The tail gas is sent into the recovery tank through an inlet pipe. The recovery tank is equipped with a mixing chamber containing a cyclohexylamine solution. The tail gas is introduced into the mixing chamber and mixed with the cyclohexylamine solution. Phosgene in the tail gas will react chemically with the cyclohexylamine solution to generate new cyclohexyl isocyanate, thereby achieving the purpose of removing phosgene from the tail gas. At the same time, the phosgene in the tail gas is converted into cyclohexyl isocyanate. After subsequent purification and recovery, a certain amount of cyclohexyl isocyanate can be obtained, which can reduce resource waste and remove toxic phosgene from the tail gas.

[0016] II. The present invention provides a tail gas treatment device for cyclohexyl isocyanate processing. After the cyclohexylamine solution reacts with the tail gas for a period of time, the cyclohexylamine solution and part of the cyclohexyl isocyanate converted from phosgene are discharged from the feed pipe. The remaining gas in the recovery tank is the tail gas after phosgene has been removed by the cyclohexylamine solution (nitrogen can be introduced into the recovery tank, and then the remaining tail gas in the recovery tank can be sent to the gas transmission pipe). This tail gas is sent from the recovery tank to the gas treatment box through the gas transmission pipe. After this tail gas is mixed with the alkaline solution in the gas treatment box, the hydrogen chloride gas mixed in the tail gas can be removed. In this way, the toxic part of the tail gas can be removed, and the treated gas is non-toxic. The above treatment method does not require additional landfill area. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the tail gas treatment device for cyclohexyl isocyanate processing in this utility model. Figure 2 This is a side view of the exhaust gas treatment device for cyclohexyl isocyanate processing in this utility model; Figure 3 This is one of the internal structural schematic diagrams of the tail gas treatment device for cyclohexyl isocyanate processing in this utility model. Figure 4 This is the second schematic diagram of the internal structure of the tail gas treatment device for cyclohexyl isocyanate processing in this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Recovery tank; 2. Air inlet pipe; 3. Mixing chamber; 4. Support leg; 5. Recovery stirring unit; 501. Power shaft; 502. Support base; 503. Drive unit; 504. Stirring rod; 505. Stirring blade; 6. Feed pipe; 7. Gas treatment box; 8. Gas supply pipe; 9. Base; 10. Gas treatment mixing unit; 1001. Power unit; 1002. Rotating shaft; 1003. Rotating plate; 11. Exhaust pipe; 12. Top cover. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0020] like Figures 1-4 As shown in the figure, the present invention provides a tail gas treatment device for cyclohexyl isocyanate processing, including a recovery tank 1 and an inlet pipe 2. The inlet pipe 2 is connected to the recovery tank 1. The recovery tank 1 is provided with a mixing chamber 3, which stores a cyclohexylamine solution. The inlet pipe 2 is used to send the tail gas into the cyclohexylamine solution in the mixing chamber 3.

[0021] During the synthesis of cyclohexyl isocyanate, tail gas is generated. The tail gas is sent into the recovery tank 1 through the inlet pipe 2. The recovery tank 1 is equipped with a mixing chamber 3, which contains a cyclohexylamine solution. The tail gas is introduced into the mixing chamber 3 and mixed with the cyclohexylamine solution. Phosgene in the tail gas will react chemically with the cyclohexylamine solution to generate new cyclohexyl isocyanate, thereby achieving the purpose of removing phosgene from the tail gas. At the same time, the phosgene in the tail gas is converted into cyclohexyl isocyanate. After subsequent purification and recovery, a certain amount of cyclohexyl isocyanate can be obtained, which can reduce resource waste and remove toxic phosgene from the tail gas.

[0022] In order to accelerate the mixing speed of the exhaust gas and the cyclohexylamine solution, a recovery stirring unit 5 is provided in the recovery tank 1 to accelerate the mixing speed of the exhaust gas and the cyclohexylamine solution in the mixing chamber 3.

[0023] Specifically, the recycling and stirring unit 5 includes a power shaft 501 inserted into the recycling tank 1, a support base 502 mounted on the outer wall of the recycling tank 1 and rotatably cooperating with the power shaft 501, and a drive device 503. The drive device 503 can be a drive motor. The output shaft of the drive motor is connected to the power shaft 501 through a coupling. The drive device 503 is mounted on the support base 502 through a drive motor bracket.

[0024] More specifically, the recycling tank 1 is equipped with a stirring rod 504 connected to the power shaft 501 and stirring blades 505 installed on the stirring rod 504. The stirring blades 505 are located in the mixing chamber 3.

[0025] The drive device 503 in the recycling stirring unit 5 can drive the power shaft 501 and the stirring rod 504 to rotate. The stirring blade 505 on the stirring rod 504 is located in the mixing chamber 3. During the rotation of the stirring blade 505, it can stir the cyclohexylamine solution in the mixing chamber 3, accelerate the mixing speed of the cyclohexylamine solution and the exhaust gas, and thus accelerate the mixing speed of phosgene and cyclohexylamine solution in the exhaust gas.

[0026] It should be noted that three tripods are arranged in a circular array around the center line of the recycling tank 1 on the outer wall of the recycling tank 1. The tripods are equipped with legs 4, which are vertically distributed. The bottom of the legs 4 is equipped with a pad, and the size of the pad is larger than the size of the legs 4.

[0027] For reference Figure 3 The bottom of the recycling tank 1 is equipped with a discharge pipe 6, and a valve for controlling the opening and closing is installed at the discharge pipe 6.

[0028] After the phosgene in the exhaust gas is removed, other impurities in the exhaust gas still need to be treated. Therefore, a gas treatment box 7 and a gas supply pipe 8 for connecting the gas treatment box 7 and the recovery tank 1 are installed at the recovery tank 1. An alkaline solution is installed in the gas treatment box 7.

[0029] After the cyclohexylamine solution reacts with the tail gas for a period of time, the cyclohexylamine solution and some of the cyclohexyl isocyanate converted from phosgene are discharged from the feed pipe 6. The remaining gas in the recovery tank 1 is the tail gas after phosgene has been removed by the cyclohexylamine solution (nitrogen can be introduced into the recovery tank 1, and then the remaining tail gas in the recovery tank 1 can be sent to the gas transmission pipe 8). This tail gas is sent from the recovery tank 1 to the gas treatment box 7 through the gas transmission pipe 8. After this tail gas is mixed with the alkaline solution in the gas treatment box 7, the hydrogen chloride gas mixed in with the tail gas can be removed. In this way, the toxic part of the tail gas can be removed, and the treated gas is non-toxic.

[0030] Specifically, the bottom of the gas handling box 7 is provided with a support base 9.

[0031] In order to accelerate the mixing speed of exhaust gas and alkaline solution in gas treatment box 7, a gas treatment stirring unit 10 is provided in gas treatment box 7. The gas treatment stirring unit 10 includes a power unit 1001 installed on gas treatment box 7, a rotating shaft 1002 connected to the power unit 1001, and a rotating plate 1003 installed on the rotating shaft 1002 and located in the alkaline solution in gas treatment box 7. Multiple rotating plates 1003 are provided, and the multiple rotating plates 1003 are arranged in a circumferential array around the center line of the rotating shaft 1002.

[0032] Specifically, an exhaust pipe 11 is provided at the gas treatment box 7, and a top cover 12 is provided on the top of the gas treatment box 7, with the exhaust pipe 11 installed on the top cover 12.

[0033] In summary, this utility model provides a tail gas treatment device for cyclohexyl isocyanate processing. During the synthesis of cyclohexyl isocyanate, tail gas is generated. The tail gas is sent into the recovery tank 1 through the inlet pipe 2. The recovery tank 1 is provided with a mixing chamber 3, which contains a cyclohexylamine solution. The tail gas is introduced into the mixing chamber 3 and mixed with the cyclohexylamine solution therein. Phosgene in the tail gas will react chemically with the cyclohexylamine solution to generate new cyclohexyl isocyanate, thereby achieving the purpose of removing phosgene from the tail gas. At the same time, the phosgene in the tail gas is converted into cyclohexyl isocyanate. After subsequent purification and recovery of these solutions, a certain amount of cyclohexyl isocyanate can be obtained, which can reduce resource waste and remove toxic phosgene from the tail gas.

[0034] After the cyclohexylamine solution reacts with the tail gas for a period of time, the cyclohexylamine solution and some of the cyclohexyl isocyanate converted from phosgene are discharged from the feed pipe 6. The remaining gas in the recovery tank 1 is the tail gas after phosgene has been removed by the cyclohexylamine solution (nitrogen can be introduced into the recovery tank 1, and then the remaining tail gas in the recovery tank 1 can be sent to the gas transmission pipe 8). This tail gas is sent from the recovery tank 1 to the gas treatment box 7 through the gas transmission pipe 8. After this tail gas is mixed with the alkaline solution in the gas treatment box 7, the hydrogen chloride gas mixed in with the tail gas can be removed. In this way, the toxic part of the tail gas can be removed, and the treated gas is non-toxic.

[0035] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A tail gas treatment device for cyclohexyl isocyanate processing, comprising a recovery tank (1) and an inlet pipe (2), characterized in that, The intake pipe (2) is connected to the recovery tank (1). The recovery tank (1) is equipped with a mixing chamber (3). The mixing chamber (3) stores a cyclohexylamine solution. The intake pipe (2) is used to send the exhaust gas into the cyclohexylamine solution in the mixing chamber (3). The bottom of the recycling tank (1) is provided with a discharge pipe (6), and a valve for controlling the opening and closing is provided at the discharge pipe (6); The recovery tank (1) is equipped with a recovery stirring unit (5) for accelerating the mixing speed of the exhaust gas and the cyclohexylamine solution in the mixing chamber (3). The recovery tank (1) is equipped with a gas processing box (7) and a gas supply pipe (8) for connecting the gas processing box (7) and the recovery tank (1). The gas processing box (7) is equipped with an alkaline solution.

2. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 1, characterized in that, The recycling stirring unit (5) includes a power shaft (501) inserted into the recycling tank (1), a support base (502) mounted on the outer wall of the recycling tank (1) and rotatingly cooperating with the power shaft (501), and a drive device (503).

3. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 2, characterized in that, The drive unit (503) is mounted on the support base (502) via a drive motor bracket.

4. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 3, characterized in that, The recycling tank (1) is equipped with a stirring rod (504) connected to the power shaft (501) and stirring blades (505) installed on the stirring rod (504). The stirring blades (505) are located in the mixing chamber (3).

5. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 1, characterized in that, The outer wall of the recycling tank (1) is provided with three tripods arranged in a circular array around the center line of the recycling tank (1), and the tripods are provided with legs (4).

6. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 5, characterized in that, The legs (4) are vertically distributed, and a pad is provided at the bottom of the legs (4), the size of which is larger than that of the legs (4).

7. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 1, characterized in that, The bottom of the gas processing box (7) is provided with a base (9) for support.

8. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 1, characterized in that, A gas processing stirring unit (10) is provided at the gas processing box (7). The gas processing stirring unit (10) includes a power device (1001) installed on the gas processing box (7), a rotating shaft (1002) connected to the power device (1001), and a rotating plate (1003) installed on the rotating shaft (1002) and located in the alkaline solution inside the gas processing box (7).

9. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 8, characterized in that, Multiple rotating plates (1003) are provided, and the multiple rotating plates (1003) are arranged in a circular array around the center line of the rotating axis (1002).

10. The tail gas treatment device for cyclohexyl isocyanate processing as described in claim 1, characterized in that, An exhaust pipe (11) is provided at the gas treatment box (7), and a top cover (12) is provided on the top of the gas treatment box (7). The exhaust pipe (11) is installed on the top cover (12).

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