Closed reaction kettle for synthesizing N-methyl o-phenylenediamine hydrochloride

Abstract

The utility model provides a closed reaction kettle for synthesizing N-methyl o-phenylenediamine hydrochloride, which comprises a kettle body, the upper end of the kettle body is fixedly connected with a mounting pipe orifice, the mounting pipe orifice is provided with a driving motor, the output end of the lower part of the driving motor is fixedly connected with a stirring rod, the lower part of the stirring rod is fixedly connected with a stirring blade, and the stirring blade is fixedly connected with the lower part of the stirring rod. A plurality of upper pipe openings are formed in the upper end of the kettle body at equal angles, flange covers are arranged on the upper pipe openings in a matched mode, sensors are arranged on the flange covers, and a lower pipe opening is fixedly connected to the middle of the lower end of the kettle body. According to the present invention, the designed kettle body can be directly provided with the stirring structure, and the multiple upper pipe openings are provided so as to meet the requirements of different processes;

Description

Technical Field

[0001] The present invention relates to the technical field of reaction kettles, and particularly to a closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride. Background Art

[0002] In chemical production, a reaction kettle is used as a reaction vessel, and a stirring mechanism is usually provided during the reaction process for homogenizing the reaction materials, thereby improving the production efficiency. However, most reaction kettles with a stirring mechanism are divided into upper and lower parts (kettle body and upper cover), and the two are fixedly connected using bolts and nuts. When installing this stirring mechanism, the driving motor needs to be pre-fixed at the upper end of the upper cover first, and then the stirring blades are placed inside the kettle body. When the upper cover and the kettle body are fixed, the driving motor and the stirring blades are connected through a coupling. The installation of this stirring mechanism results in poor integrity of the reaction kettle. If the lip line of the stirring mechanism is damaged, it is not easy to repair. In addition, the same product has different production routes, and different routes have different requirements for the reaction kettle.

[0003] For example, there are the following methods in the production process of N-methyl-o-phenylenediamine hydrochloride. Dimethyl carbonate, o-phenylenediamine, and NAY catalyst are added into the reaction kettle according to a certain mass ratio, then the NAY catalyst is removed by centrifugation, then dimethyl carbonate is removed by evaporation, and finally hydrogen chloride is added to obtain it. This preparation method is simpler, easier to operate, has a low error rate, a high yield, a high secondary salting yield, and is easy to remove impurities. And another method is that o-chloronitrobenzene reacts with aqueous monomethylamine solution in a closed manner, and through a series of chemical changes, including hydrogenation reduction and dropping hydrochloric acid, N-methyl-o-phenylenediamine hydrochloride is finally obtained. The product prepared by this method has high purity and few impurities, and can be widely used in the synthesis field of the intermediate of the antihypertensive drug telmisartan.

[0004] Due to different production processes, their difficulties and costs are also different. Therefore, it is necessary to select a suitable production process according to the application field, so a reaction kettle that meets the above two processes is needed. Summary of the Invention

[0005] To solve the above problems, the present invention discloses a closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride, which includes a kettle body. An installation pipe orifice is fixedly connected to the upper end of the kettle body, a driving motor is installed on the installation pipe orifice, the output end of the lower part of the driving motor is fixedly connected to a stirring rod, the lower part of the stirring rod is fixedly connected to stirring blades, and the radius of the rotation trajectory of the stirring blades is smaller than the inner diameter of the installation pipe orifice. Since the radius of the rotation trajectory of the stirring blades is smaller than the inner diameter of the installation pipe orifice, the stirring blades can be directly fed into the interior of the kettle body through the installation pipe orifice. Compared with the traditional stirring structure, the integrity of the kettle body can be higher, and in terms of structure and installation, it is more convenient and faster.

[0006] A number of upper nozzles are equiangularly arranged at the upper end of the kettle body. A flange cover is fitted on the upper nozzle, and a sensor is arranged on the flange cover. The middle part of the lower end of the kettle body is fixedly connected with a lower nozzle. The setting of multiple nozzles can meet the introduction of different raw materials under different processes, and the redundant nozzles can be sealed by the flange cover. In addition, a sensor is arranged on the flange cover to monitor the reaction environment. At the same time, setting the sensor on the flange cover can avoid opening a special sensor installation structure on the kettle body, ensuring the integrity of the kettle body. Meanwhile, using this method, corresponding types and specifications of sensors can be selected according to different production processes, and the replacement of the sensor is more flexible with this structure.

[0007] Preferably, a heat exchange tube is arranged inside the kettle body. Two heating nozzles are fixedly connected to the upper end of the kettle body, and the ends of the heat exchange tube are respectively fixedly connected to the heating nozzles. The heat exchange tube is mainly used for heating the reaction system, that is, a heat medium is introduced into the heat exchange tube.

[0008] Preferably, flanges are arranged on the upper nozzle, the heating nozzle and the lower nozzle. By setting the flanges, the stability of the connection can be ensured, and the problem of the kettle body under high pressure can be ensured.

[0009] Preferably, the sensor is a temperature sensor or a pressure sensor, that is, it is used to monitor the temperature or pressure in the reaction system. Further, a temperature sensor and a pressure sensor can be installed simultaneously when necessary.

[0010] Preferably, a number of sealing rings are sleeved on the lower side wall of the driving motor, and the sealing rings are in contact with the inner wall of the installation nozzle. The sealing rings are used to ensure the sealing between the driving motor and the installation nozzle.

[0011] Preferably, a connecting ring is fixedly connected to the middle side wall of the driving motor, and the connecting ring is matched with the flange at the upper end of the installation nozzle. That is, the driving motor is fixedly connected to the installation nozzle through the connecting ring. Specifically, bolts and nuts are used to pass through the through holes preset on the connecting ring and the flange to achieve fixation.

[0012] Preferably, a number of support legs are fixedly connected equiangularly to the lower edge of the kettle body, and the lower ends of the support legs are fixedly connected with a fixing plate. The support legs are used to support and fix the kettle body.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. An installation nozzle is provided, and the stirring blades can directly extend into the interior of the reaction kettle from the installation nozzle, which simplifies the installation of the stirring mechanism and can also provide the integrity of the reaction kettle, ensuring its mechanical properties.

[0015] 2. There are multiple upper nozzle openings, which can meet the introduction of different raw materials in different processes. If there are redundant upper nozzle openings, they can be blocked with flange covers. Further, sensors can be added to the flange covers to monitor the reaction state. At the same time, the type of sensors selected in this way is relatively flexible, and there is no need to open holes or other structures for installing sensors on the kettle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0017] Figure 2 is a three-dimensional schematic diagram of the stirring mechanism of the present invention;

[0018] Figure 3 is a cross-sectional schematic diagram of the present invention;

[0019] Figure 4 is Figure 3 the enlarged view of part A in

[0020] LIST OF REFERENCE NUMERALS:

[0021] 1. Support leg; 2. Kettle body; 3. Flange cover; 4. Heating nozzle opening; 5. Sensor; 6. Upper nozzle opening; 7. Installation nozzle opening; 8. Driving motor; 9. Stirring blade; 10. Stirring rod; 11. Connecting ring; 12. Lower nozzle opening; 13. Heat exchange tube; 14. Sealing ring. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be further illustrated below in conjunction with the drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0023] As Figures 1 to 4 shown, a closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride includes a kettle body 2. The kettle body 2 is cylindrical and both ends are rounded. An installation nozzle opening 7 is fixedly connected to the upper end of the kettle body 2. A driving motor 8 is installed on the installation nozzle opening 7. The output end of the driving motor 8 at the lower part is fixedly connected to a stirring rod 10. A stirring blade 9 is fixedly connected to the lower part of the stirring rod 10. That is, when the driving motor 8 is started, the stirring blade 9 is driven to rotate by the stirring rod 10, so as to mix the reactants in the kettle body 2 and improve the reaction rate. The radius of the rotation trajectory of the stirring blade 9 is smaller than the inner diameter of the installation nozzle opening 7. The structure of the stirring blade 9 here enables the stirring blade 9 to directly extend into the kettle body 2 through the installation nozzle opening 7, which can make the integrity of the kettle body 2 higher and is beneficial to withstanding high pressure.

[0024] At the upper end of the kettle body 2, several upper nozzles 6 are arranged at equal angles. The upper nozzles 6 are used for feeding raw materials. Due to different processes, the types and quantities of raw materials used are different. Therefore, setting multiple upper nozzles 6 can meet the needs of different processes. A flange cover 3 is arranged in cooperation with the upper nozzle 6. If the upper nozzle 6 is not used, the flange cover 3 is used for blocking. A sensor 5 is arranged on the flange cover 3. The sensor 5 is used to monitor the reaction system inside the kettle body 2 to ensure normal reaction. In the middle of the lower end of the kettle body 2, a lower nozzle 12 is fixedly connected, which is used to discharge the reacted materials.

[0025] Inside the kettle body 2, a heat exchange tube 13 is arranged. The heat exchange tube 13 is mainly used for heating the reaction system. When necessary, a refrigerant can also be injected into the heat exchange tube 13 for cooling to ensure that the reaction system is within the correct reaction temperature range. At the upper end of the kettle body 2, two heating nozzles 4 are fixedly connected. The end parts of the heat exchange tube 13 are respectively fixedly connected to the heating nozzles 4. A heat medium is injected through one heating nozzle 4, and the heat medium is discharged through the other heating nozzle 4.

[0026] Flanges are arranged on the upper nozzle 6, the heating nozzle 4 and the lower nozzle 12. Using the flange structure ensures the firm connection of components and is suitable for reaction production under high pressure.

[0027] The sensor 5 is a temperature sensor or a pressure sensor, which are respectively used to monitor the temperature and pressure inside the kettle body 2. Further, if necessary, a temperature sensor and a pressure sensor can be selected simultaneously. Using this structure can avoid opening a structure for installing the sensor 5 on the kettle body 2 and ensure the overall mechanical properties of the kettle body 2.

[0028] A number of sealing rings 14 are sleeved on the lower side wall of the driving motor 8. The sealing rings 14 are in contact with the inner wall of the installation nozzle 7. Using the sealing rings 14 ensures the sealing performance of the installation part of the driving motor 8 after installation.

[0029] A connecting ring 11 is fixedly connected to the middle side wall of the driving motor 8. And the connecting ring 11 belongs to a flange, and this flange is fixedly connected to the middle side wall of the driving motor 8. The connecting ring 11 cooperates with the flange at the upper end of the installation nozzle 7. Through the flange cooperation method, bolts and nuts are then used to realize the fixed connection of the two.

[0030] At the lower end edge of the kettle body 2, several support legs 1 are fixedly connected at equal angles. The support legs 1 are used to support and fix the kettle body 2. The lower end of the support leg 1 is fixedly connected with a fixing plate, and through holes are arranged on the fixing plate, that is, connecting components such as bolts pass through the through holes for fixation.

[0031] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride, characterized in that: It includes a kettle body (2), an installation pipe opening (7) is fixedly connected to the upper end of the kettle body (2), a driving motor (8) is installed on the installation pipe opening (7), a stirring rod (10) is fixedly connected to the output end of the lower part of the driving motor (8), a stirring blade (9) is fixedly connected to the lower part of the stirring rod (10), and the radius of the rotation trajectory of the stirring blade (9) is smaller than the inner diameter of the installation pipe opening (7). A plurality of upper pipe openings (6) are arranged at equal angles at the upper end of the kettle body (2), a flange cover (3) is arranged in cooperation with the upper pipe opening (6), a sensor (5) is arranged on the flange cover (3), and a lower pipe opening (12) is fixedly connected to the middle of the lower end of the kettle body (2).

2. The closed reactor for synthesizing N-methyl-o-phenylenediamine hydrochloride according to claim 1, characterized in that: A heat exchange pipe (13) is arranged inside the kettle body (2), two heating pipe openings (4) are fixedly connected to the upper end of the kettle body (2), and the end parts of the heat exchange pipe (13) are respectively fixedly connected to the heating pipe openings (4).

3. The closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride according to claim 2, characterized in that: Flanges are arranged on the upper pipe opening (6), the heating pipe opening (4) and the lower pipe opening (12).

4. A closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride according to claim 1, characterized in that: The sensor (5) is a temperature sensor or a pressure sensor.

5. A closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride according to claim 1, characterized in that: A plurality of sealing rings (14) are sleeved on the side wall of the lower part of the driving motor (8), and the sealing rings (14) are in contact with the inner wall of the installation pipe opening (7).

6. The closed reactor for synthesizing N-methyl-o-phenylenediamine hydrochloride according to claim 1, characterized in that: A connecting ring (11) is fixedly connected to the side wall of the middle part of the driving motor (8), and the connecting ring (11) is in cooperation with the flange at the upper end of the installation pipe opening (7).

7. A closed reaction kettle for synthesizing N-methyl-o-phenylenediamine hydrochloride according to claim 1, characterized in that: A plurality of support legs (1) are fixedly connected at equal angles to the edge of the lower end of the kettle body (2), and a fixing plate is fixedly connected to the lower end of the support legs (1).

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