Reaction device for p-toluenesulfonyl isocyanate

Abstract

The reaction device comprises a reaction kettle, a circulating cylinder is arranged in the reaction kettle, the top of the circulating cylinder is closed, the bottom of the circulating cylinder is open, a cavity is formed in the cylinder wall, a plurality of supporting rods are arranged on the edge portion of the outer top face of the circulating cylinder, the top ends of the supporting rods are fixedly connected with material dispersing cones, and the top of the reaction kettle corresponding to the material dispersing cones is communicated with a feeding pipe. A material pump is arranged between the bulk material cone and the top of the circulating barrel, an inlet of the material pump is communicated with a circulating pipe, the bottom end of the circulating pipe penetrates through the top of the circulating barrel to the inner side of the circulating barrel, a plurality of groups of connecting rods are arranged on the outer side of the circulating barrel, the same group of connecting rods are fixedly connected with the same motor, and an output shaft of the motor is fixedly connected with a disc type turbine stirrer; a plurality of air inlet branch pipes are circumferentially distributed at the bottom of the circulating cylinder at intervals, the top ends of the air inlet branch pipes are communicated with the cavity, and the bottom ends of the air inlet branch pipes extend out of the reaction kettle and are communicated with a hollow air inlet disc. The device can effectively improve the efficiency and quality of dissolution and reaction, and is more practical.

Description

Technical Field

[0001] This invention belongs to the field of reaction technology, specifically relating to a reaction apparatus for p-toluenesulfonyl isocyanate. Background Technology

[0002] p-Toluenesulfonyl isocyanate is a commonly used monoisocyanate and a frequently used dehydrating agent in chemical products. It is mainly synthesized by reacting phosgene with p-toluenesulfonamide. The specific synthesis reaction involves first dissolving solid toluenesulfonamide in chlorobenzene solvent, then introducing phosgene to carry out a photocatalytic reaction to obtain p-toluenesulfonyl isocyanate. However, in actual synthesis, the solid toluenesulfonamide often falls into the chlorobenzene solvent during feeding, resulting in uneven distribution and a slow dissolution rate. This hinders the rapid progress of the subsequent photocatalytic reaction. Furthermore, during the photocatalytic reaction, the phosgene is not evenly distributed and its mixing with the solution is insufficient, leading to a less than ideal reaction rate. Overall, the synthesis efficiency and quality are not high and require improvement. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a reaction apparatus for p-toluenesulfonyl isocyanate, which can effectively improve the efficiency and quality of dissolution and reaction, so as to solve the above problems.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a reaction apparatus for p-toluenesulfonyl isocyanate, comprising a reaction vessel and a gas pump. A circulation cylinder is coaxially arranged inside the reaction vessel. The top of the circulation cylinder is closed, the bottom is open, and a cavity is provided inside the cylinder wall. Several support rods arranged in a circularly spaced pattern are fixedly mounted on the edge of the outer top surface of the circulation cylinder. The top of each support rod is fixedly connected to the same material distribution cone. A feed pipe with a feed valve is fixedly connected to the top of the reaction vessel corresponding to the material distribution cone. A material pump is fixedly mounted between the material distribution cone and the top of the circulation cylinder. The inlet of the material pump faces downward and is fixedly connected to a circulation pipe, while the outlet faces upward. The bottom end of the circulation pipe penetrates through the top of the circulation cylinder to the inside of the circulation cylinder. On the side, several sets of connecting rods arranged in a circular interval are fixedly installed on the outer side of the circulating cylinder. The same set of connecting rods is fixedly connected to the same motor. The output shaft of the motor faces away from the circulating cylinder and is coaxially fixedly connected to a disc turbine agitator. Several nozzles are distributed on both the inner and outer sides of the circulating cylinder. The nozzles are fixedly connected to the cavity. Several air inlet branches are arranged in a circular interval on the bottom of the circulating cylinder. The top of each air inlet branch is fixedly connected to the cavity, and the bottom of each air inlet branch extends out of the reactor and is fixedly connected to the same hollow air inlet plate. The inlet of the air pump is fixedly connected to an air supply pipeline, and the outlet is fixedly connected to the air inlet plate through an air inlet pipe. The bottom of the reactor is fixedly connected to a discharge pipe with a discharge valve.

[0005] Preferably, the same set of connecting rods are fixedly connected to the same protective box, and the motor is built into the corresponding protective box.

[0006] Preferably, the air inlet pipe is equipped with a gas flow meter and a flow regulating valve.

[0007] Preferably, an exhaust pipe with an exhaust valve is fixedly connected to the top of the reactor.

[0008] Preferably, a jacket is fixedly fitted on the outside of the reactor, with an input pipe fixedly connected to the lower part of one side of the jacket and an output pipe fixedly connected to the upper part of the other side.

[0009] Preferably, the lower part of the jacket is provided with an input ring tube and the upper part is provided with an output ring tube. The input ring tube is connected to the input tube and the output ring tube is connected to the output tube. A plurality of S-shaped tubes are distributed between the input ring tube and the output ring tube. The bottom end of the S-shaped tube is connected to the input ring tube and the top end is connected to the output ring tube.

[0010] The beneficial effects of this invention are as follows: When synthesizing p-toluenesulfonyl isocyanate, the feed valve can be opened first, and chlorobenzene solvent can be fed into the reactor through the feed pipe. During feeding, the solvent first falls onto the dispersion cone, is dispersed by the dispersion cone, and then falls evenly to the bottom of the reactor, effectively ensuring the uniformity of the solvent. Then, the feed pump and motor are started. Under the pumping of the feed pump, the solvent at the bottom can be pumped through the circulation cylinder and circulation pipe to the outlet of the feed pump and sprayed upwards to the bottom of the dispersion cone. After being blocked by the dispersion cone, it is redispersed and falls back to the periphery of the circulation cylinder. The operation of the motor can drive the corresponding disc turbine agitator to perform efficient and high-quality stirring. With the cooperation of both, the fluidity and uniformity of the solvent can be effectively ensured. Next, solid toluenesulfonamide is fed into the reactor via the feed pipe. The material first falls onto the distribution cone, where it is dispersed before evenly descending to the bottom of the reactor. This ensures uniformity of the feed, and in conjunction with the feed pump and disc turbine agitator, it facilitates dissolution in the chlorobenzene solvent, significantly improving the dissolution rate and the uniformity of the resulting solution. This, in turn, is beneficial for subsequent photoluminescence reactions, ensuring overall reaction efficiency and quality. Afterward, the air pump is activated, delivering the required phosgene into the cavity via the air inlet pipe, air inlet disc, and air inlet branch pipe. The phosgene is then sprayed out through multiple nozzles on the inner and outer sides of the circulation cylinder, ensuring uniform distribution during phosgene intake. This, combined with the circulation and mixing of the solution, promotes full contact between the phosgene and the solution, greatly enhancing the reaction effect and accelerating the reaction rate. This further improves overall reaction efficiency and quality, making the reactor more practical. Once the reaction is complete, the discharge valve is opened, and the reaction liquid is discharged through the discharge pipe. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0012] Figure 2This is a schematic diagram of the main structure of the circulating cylinder of this utility model;

[0013] Figure 3 This is a top view of the circulating cylinder of this utility model;

[0014] Figure 4 This is a schematic diagram of the main structure of the jacket of this utility model.

[0015] The diagram is labeled as follows: 1 is the reactor, 2 is the circulation cylinder, 3 is the cavity, 4 is the support rod, 5 is the material dispersing cone, 6 is the feed valve, 7 is the feed pipe, 8 is the material pump, 9 is the circulation pipe, 10 is the connecting rod, 11 is the motor, 12 is the disc turbine agitator, 13 is the nozzle, 14 is the air inlet branch pipe, 15 is the air inlet disc, 16 is the air pump, 17 is the air supply pipeline, 18 is the air inlet pipe, 19 is the discharge valve, 20 is the discharge pipe, 21 is the protective box, 22 is the gas flow meter, 23 is the flow regulating valve, 24 is the exhaust valve, 25 is the exhaust pipe, 26 is the jacket, 27 is the input pipe, 28 is the output pipe, 29 is the input loop pipe, 30 is the output loop pipe, and 31 is the S-shaped pipe. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] like Figures 1 to 4 As shown, a reaction apparatus for p-toluenesulfonyl isocyanate includes a reaction vessel 1 and a gas pump 16. A circulation cylinder 2 is coaxially arranged inside the reaction vessel 1. The top of the circulation cylinder 2 is closed, the bottom is open, and a cavity 3 is provided inside the cylinder wall. Several support rods 4 are fixedly arranged in a circular pattern on the edge of the outer top surface of the circulation cylinder 2. The top of each support rod 4 is fixedly connected to the same material distribution cone 5. A feed pipe 7 with a feed valve 6 is fixedly connected to the top of the reaction vessel 1 corresponding to the material distribution cone 5. A feed pump 8 is fixedly mounted between the material distribution cone 5 and the top of the circulation cylinder 2. The inlet of the feed pump 8 faces downward and is fixedly connected to a circulation pipe 9, while the outlet faces upward. The bottom end of the circulation pipe 9 penetrates through the top of the circulation cylinder 2 to the inner side of the circulation cylinder 2. Several sets of circumferentially spaced connecting rods 10 are fixedly installed on the outer side of the circulation cylinder 2. The same set of connecting rods 10 is fixedly connected to the same motor 11. The output shaft of the motor 11 faces away from the circulation cylinder 2 and is coaxially fixedly connected to a disc turbine agitator 12. Several nozzles 13 are distributed on both the inner and outer sides of the circulation cylinder 2. The nozzles 13 are fixedly connected to the cavity 3. Several air inlet branches 14 are circumferentially spaced on the bottom of the circulation cylinder 2. The top ends of the air inlet branches 14 are fixedly connected to the cavity 3, and the bottom ends extend out of the reactor 1 and are fixedly connected to the same hollow air inlet plate 15. The inlet of the air pump 16 is fixedly connected to the air supply pipeline 17, and the outlet is fixedly connected to the air inlet plate 15 through the air inlet pipe 18. The bottom of the reactor 1 is fixedly connected to the discharge pipe 20 with a discharge valve 19.

[0018] When synthesizing p-toluenesulfonyl isocyanate, the feed valve 6 can be opened first, and chlorobenzene solvent can be fed into the reactor 1 through the feed pipe 7. During feeding, the solvent first falls onto the dispersion cone 5, is dispersed by the dispersion cone 5, and then falls evenly to the bottom of the reactor 1, which can effectively ensure the uniformity of the solvent. Then, the feed pump 8 and motor 11 are started. Under the pumping of the feed pump 8, the solvent at the bottom can be pumped through the circulation cylinder 2 and circulation pipe 9 to the outlet of the feed pump 8 and sprayed upwards to the bottom of the dispersion cone 5. After being blocked by the dispersion cone 5, it is redispersed and falls back to the periphery of the circulation cylinder 2. The operation of the motor 11 can drive the corresponding disc turbine agitator 12 to perform efficient and high-quality stirring. With the cooperation of both, the fluidity and uniformity of the solvent can be effectively guaranteed. Next, solid toluenesulfonamide material can be fed into reactor 1 through feed pipe 7. The material first falls onto the distribution cone 5, where it is dispersed before evenly falling to the bottom of reactor 1. This effectively ensures the uniformity of the material feed. Combined with the feed pump 8 and disc turbine stirrer 12, this further facilitates the dissolution of the material in chlorobenzene solvent, significantly improving the dissolution rate and the uniformity of the resulting solution. This, in turn, is more conducive to the subsequent photoluminescence reaction, ensuring overall reaction efficiency and quality. Afterwards, the air pump 16 is started, and the required phosgene is delivered to cavity 3 through air inlet pipe 18, air inlet disc 15, and air inlet branch pipe 14. It is then sprayed out through multiple nozzles 13 on the inner and outer sides of the circulation cylinder 2. This effectively ensures the uniform distribution of phosgene during intake. Combined with the circulation and mixing of the solution, this further promotes full contact and reaction between phosgene and the solution, greatly enhancing the reaction effect and accelerating the reaction rate. This further improves overall reaction efficiency and quality, making the reactor more practical. After the reaction is complete, open the discharge valve 19 and discharge the reaction liquid through the discharge pipe 20.

[0019] In this embodiment, the same set of connecting rods 10 are fixedly connected to the same protective box 21, and the motor 11 is built into the corresponding protective box 21 to effectively protect the motor 11.

[0020] In this embodiment, the air inlet pipe 18 is equipped with a gas flow meter 22 and a flow regulating valve 23 to control the amount of phosgene input and flexibly adjust the flow rate when phosgene is input.

[0021] In this embodiment, an exhaust pipe 25 with an exhaust valve 24 is fixedly connected to the top of the reactor 1 to discharge exhaust gas.

[0022] In this embodiment, a jacket 26 is fixedly sleeved on the outside of the reactor 1. An input pipe 27 is fixedly connected to the lower part of one side of the jacket 26, and an output pipe 28 is fixedly connected to the upper part of the other side, so as to form the flow channel required for the heating medium and provide the required temperature for the reaction.

[0023] In this embodiment, the lower part of the jacket 26 is provided with an input ring pipe 29, and the upper part is provided with an output ring pipe 30. The input ring pipe 29 is connected to the input pipe 27, and the output ring pipe 30 is connected to the output pipe 28. Several S-shaped pipes 31 are distributed between the input ring pipe 29 and the output ring pipe 30. The bottom end of the S-shaped pipe 31 is connected to the input ring pipe 29, and the top end is connected to the output ring pipe 30. This allows the heating medium to first enter the input ring pipe 29 through the input pipe 27, then flow into each S-shaped pipe 31, and after flowing through the S-shaped pipes 31, it collects in the output ring pipe 30, and finally is discharged through the output pipe 28. In this way, the residence time of the heating medium can be effectively extended and the distribution of the heating medium can be made more uniform, thereby making the heating of the reactor 1 more uniform and effective, which is more conducive to ensuring the efficiency and quality of the reaction.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reaction apparatus for p-toluenesulfonyl isocyanate, comprising a reaction vessel and a gas pump, characterized in that, A circulation cylinder is coaxially arranged inside the reactor. The top of the circulation cylinder is closed, the bottom is open, and the cylinder wall has a cavity. Several circumferentially spaced support rods are fixed to the edge of the outer top surface of the circulation cylinder. The top of each support rod is fixedly connected to the same material distribution cone. A feed pipe with a feed valve is fixedly connected to the top of the reactor corresponding to the material distribution cone. A material pump is fixedly mounted between the top of the material distribution cone and the circulation cylinder. The inlet of the material pump faces downward and is fixedly connected to the circulation pipe, while the outlet faces upward. The bottom end of the circulation pipe penetrates the top of the circulation cylinder to the inner side of the circulation cylinder. Several sets of circumferentially spaced support rods are fixed to the outer side of the circulation cylinder. The connecting rods are fixedly connected to the same motor. The output shaft of the motor faces away from the circulating cylinder and is coaxially fixedly connected to a disc turbine agitator. Several nozzles are distributed on both the inner and outer sides of the circulating cylinder. The nozzles are fixedly connected to the cavity. Several air inlet branches are distributed circumferentially at intervals on the bottom of the circulating cylinder. The top ends of the air inlet branches are fixedly connected to the cavity, and the bottom ends extend out of the reactor and are fixedly connected to the same hollow air inlet plate. The inlet of the air pump is fixedly connected to the air supply pipeline, and the outlet is fixedly connected to the air inlet plate through the air inlet pipe. The bottom of the reactor is fixedly connected to the discharge pipe with a discharge valve.

2. The reaction apparatus for p-toluenesulfonyl isocyanate according to claim 1, characterized in that, The same set of connecting rods are fixedly connected to the same protective box, and the motor is built into the corresponding protective box.

3. The reaction apparatus for p-toluenesulfonyl isocyanate according to claim 1, characterized in that, The air inlet pipe is equipped with a gas flow meter and a flow regulating valve.

4. The reaction apparatus for p-toluenesulfonyl isocyanate according to claim 1, characterized in that, An exhaust pipe with an exhaust valve is fixedly connected to the top of the reactor.

5. The reaction apparatus for p-toluenesulfonyl isocyanate according to claim 1, characterized in that, The outer side of the reactor is fixedly fitted with a jacket, and the lower part of one side of the jacket is fixedly connected to an input pipe, and the upper part of the other side is fixedly connected to an output pipe.

6. The reaction apparatus for p-toluenesulfonyl isocyanate according to claim 5, characterized in that, The lower part of the jacket is provided with an input ring tube and the upper part is provided with an output ring tube. The input ring tube is connected to the input tube and the output ring tube is connected to the output tube. Several S-shaped tubes are distributed between the input ring tube and the output ring tube. The bottom end of the S-shaped tube is connected to the input ring tube and the top end is connected to the output ring tube.

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