Reaction kettle for producing 2-amino-4, 6-dimethoxypyrimidine

Abstract

The utility model belongs to the technical field of production of 2-amino-4, 6-dimethoxypyrimidine, and discloses a reaction kettle for producing 2-amino-4, 6-dimethoxypyrimidine, which comprises a reaction device for accommodating, heating and stirring chemical raw materials, and a sealing device which is arranged at the top of the reaction device and is used for positioning and clamping the reaction kettle for dual sealing, a fixing device used for eight-point synchronous rotation locking sealing is arranged on the sealing device. The fixing device comprises a supporting plate, a transmission stud is installed in the center of the supporting plate, and the transmission stud is in threaded connection with the supporting plate. According to the reaction kettle for producing 2-amino-4, 6-dimethoxypyrimidine, provided by the utility model, eight positions are rotated and locked at the same time through the arrangement of eight-point synchronous rotating, locking and sealing, so that the operation is simplified; the kettle cover is prevented from inclining towards one side through the arrangement of eight-point synchronous rotation locking and sealing, so that the sealing effect is ensured; and through the up-and-down staggered double sealing arrangement, the sealing effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of 2-amino-4,6-dimethoxypyrimidine production, in particular to a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine. Background Art

[0002] In the production of sulfonylurea herbicides, 2-amino-4,6-dimethoxypyrimidine is an important intermediate for its synthesis. There are many varieties of herbicides synthesized with it, such as nicosulfuron, benzylsulfuron, pyrazosulfuron, pyrimidosulfuron, alumsulfuron, ethoxysulfuron, phthalosulfuron, etc. There are two main preparation methods: one is to put methanol and sodium methoxide into the reactor, then add a certain amount of 2-amino-4,6-dichloropyrimidine, stir, heat and reflux for 6 hours, cool to room temperature after sampling and analysis, discharge and filter to obtain the finished product; the other is to add malononitrile as the raw material into the reactor, then add methanol, cool to 0°C, pass dry hydrogen chloride, the reaction is exothermic, the temperature gradually rises to 15°C, maintain the temperature, pass a certain amount of hydrogen chloride and continue stirring for 3 to 4 hours, cool and crystallize and filter to obtain 1,3- Dimethylmalonamide hydrochloride, the 1,3-dimethylmalonamide hydrochloride is added to a sodium bicarbonate solution cooled to 0°C, the pH is adjusted to 6, a crystalline hydrochloride is obtained, the filtrate is filtered, a 50% cyanamide solution is added to the filtrate, the mixture is stirred, and heated to room temperature, and the mixture is stirred for 2 hours to obtain crystals of 3-amino-3-methoxy-N-cyano-2-propionamidine, which is filtered, washed with water, dried, and dissolved in toluene. Toluene is charged into another reaction pot and heated to reflux, the above propionamidine toluene solution is added, stirred for 1 hour, filtered, concentrated, cooled, and crystallized to obtain the finished product.

[0003] In contrast, a Chinese patent with authorization announcement number CN220573424U discloses a chemical reactor that is easy to transport, including a chemical reactor body and a servo motor module. A servo motor module is arranged above the chemical reactor body, and a locking sleeve is fixedly connected to the bottom of the servo motor module. An operation unlocking mechanism is arranged inside the locking sleeve. A docking top block is fixedly connected to the top of the chemical reactor body, and a locking mechanism is arranged between the docking top block and the locking sleeve; the locking mechanism includes a locking column, which is fixedly connected to the top of the docking top block, and eight locking grooves are opened on the outer side of the locking column, and eight sliding grooves are opened on the inner wall of the locking sleeve. A locking block is slidably connected between the inner walls of the sliding groove, and the locking block is used in conjunction with the locking groove.

[0004] The above patent uses flange plus bolts to close the kettle cover and seal the reactor. In order to prevent the kettle cover from tilting to one side and ensure the sealing effect, it must be tightened diagonally and symmetrically in multiple times. The operation is cumbersome and difficult to control. Therefore, a new device needs to be designed. Utility Model Content

[0005] The utility model aims to provide a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine to solve the problems raised in the above background technology.

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

[0007] A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine, comprising a reaction device for containing, heating and stirring chemical raw materials, and a sealing device installed on the top of the reaction device for positioning and locking the double-sealed reaction kettle, wherein a fixing device for eight-point synchronous rotation locking sealing is arranged on the sealing device;

[0008] The fixing device includes a support plate, a transmission stud is installed at the center of the support plate, the transmission stud is threadedly connected to the support plate, a hand wheel is installed on the top of the transmission stud, a toothed disk is arranged at the bottom of the transmission stud, eight gears are evenly meshed on the circumference of the toothed disk, a pressure block is arranged under the gear, a locking stud is arranged under the pressure block, and a limiting rod is arranged above the gear.

[0009] Furthermore: the reaction device includes a kettle body, a stirring rod is rotatably installed in the kettle body, a stirring motor is arranged on the top of the stirring rod, two liquid inlet pipes are symmetrically arranged on the front and rear sides of the stirring motor, a feeding pipe is arranged on one side of the top of the kettle body, a discharging pipe is arranged at the bottom of the kettle body, and a jacket is installed on the outside of the kettle body.

[0010] Furthermore: the sealing device includes an end cover, a kettle cover is arranged on the end cover, a plurality of positioning blocks are evenly arranged on the circumference of the junction between the end cover and the kettle cover, a first sealing gasket is arranged between the end cover and the kettle cover, a second sealing gasket is arranged outside the first sealing gasket, and the first sealing gasket and the second sealing gasket are staggered up and down.

[0011] Furthermore: the limiting rod is cylindrical in shape, and the limiting rod is slidably connected to the support plate.

[0012] Furthermore: the support plate is connected to the kettle cover by welding, and the locking stud is threadedly connected to the end cover.

[0013] Furthermore: the feed pipe is connected to the kettle body by welding.

[0014] Furthermore: four positioning blocks are provided, and the positioning blocks are integrally formed with the kettle cover.

[0015] Furthermore: the first sealing gasket is made of silicone material.

[0016] Compared with the prior art, the beneficial effects are:

[0017] 1. Through the setting of eight-point synchronous rotation and locking seal, eight positions can be rotated and locked at the same time, which simplifies the operation;

[0018] 2. The eight-point synchronous rotation and locking seal setting prevents the kettle cover from tilting to one side, ensuring the sealing effect;

[0019] 3. The sealing effect is improved by setting up double seals in an upper and lower staggered manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to the utility model;

[0021] Figure 2 It is a partial enlarged view of position A of a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine described in the utility model;

[0022] Figure 3 It is an axonometric diagram of a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to the utility model;

[0023] Figure 4 This is a front view of a reaction device of a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to the utility model;

[0024] Figure 5 This is a front cross-sectional view of a sealing device of a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to the utility model;

[0025] Figure 6 The utility model discloses an axonometric diagram of a fixing device of a reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine.

[0026] In the accompanying drawings, 101, kettle body; 102, stirring rod; 103, stirring motor; 104, liquid inlet pipe; 105, feed pipe; 106, discharge pipe; 107, jacket; 201, end cover; 202, kettle cover; 203, positioning block; 204, first sealing gasket; 205, second sealing gasket; 301, support plate; 302, transmission stud; 303, hand wheel; 304, toothed disc; 305, gear; 306, pressure block; 307, locking stud; 308, limit rod. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figure 1-Figure 6 A reactor for producing 2-amino-4,6-dimethoxypyrimidine includes a reaction device for containing, heating and stirring chemical raw materials, and also includes a sealing device installed on the top of the reaction device for positioning and locking the double-sealed reactor. A fixing device for eight-point synchronous rotation and locking sealing is arranged on the sealing device.

[0029] In this embodiment: the reaction device includes a kettle body 101, a stirring rod 102 is rotatably installed in the kettle body 101, a stirring motor 103 is arranged on the top of the stirring rod 102, two liquid inlet pipes 104 are symmetrically arranged on the front and rear sides of the stirring motor 103, a feeding pipe 105 is arranged on one side of the top of the kettle body 101, a discharging pipe 106 is arranged at the bottom of the kettle body 101, a jacket 107 is installed on the outside of the kettle body 101, the feeding pipe 105 is welded to the kettle body 101, the solid raw material is added to the inside of the kettle body 101 through the feeding pipe 105, and the liquid raw material is added to the kettle body 101 through the liquid inlet pipe 104, the stirring motor 103 drives the stirring rod 102 to rotate to stir and mix the raw materials, and the kettle body 101 is heated through the jacket 107, and the finished product is discharged from the discharging pipe 106 after the reaction is completed;

[0030] In this embodiment: the sealing device includes an end cover 201, a kettle cover 202 is arranged on the end cover 201, four positioning blocks 203 are evenly arranged on the circumference of the junction between the end cover 201 and the kettle cover 202, a first sealing gasket 204 is arranged between the end cover 201 and the kettle cover 202, a second sealing gasket 205 is arranged outside the first sealing gasket 204, the first sealing gasket 204 and the second sealing gasket 205 are staggered up and down, the positioning block 203 and the kettle cover 202 are integrally formed, the first sealing gasket 204 is made of silicone material, the positioning block 203 aligns the kettle cover 202 with the end cover 201, the fixing device makes the kettle cover 202 press the end cover 201, and at the same time cooperates with the end cover 201 to press the staggered first sealing gasket 204 and the second sealing gasket 205, so as to double seal the reactor;

[0031] In this embodiment, the fixing device includes a support plate 301, a transmission stud 302 is installed at the center of the support plate 301, the transmission stud 302 is threadedly connected to the support plate 301, a hand wheel 303 is installed on the top of the transmission stud 302, a toothed disc 304 is arranged at the bottom of the transmission stud 302, and eight gears 305 are evenly meshed on the circumference of the toothed disc 304, a pressing block 306 is arranged under the gear 305, a locking stud 307 is arranged under the pressing block 306, and a limiting rod 308 is arranged on the gear 305, the limiting rod 308 is cylindrical in shape, and the limiting rod 308 is slidably connected to the support plate 301, and the support plate 301 is connected to the kettle cover 202. The locking stud 307 is welded and threadedly connected to the end cover 201. The hand wheel 303 is rotated to drive the toothed disc 304 to rotate through the transmission stud 302. The toothed disc 304 engages with the eight gears 305 to drive the pressure block 306 and the locking stud 307 to rotate, and the eight locking studs 307 are synchronously screwed upward out of the end cover 201 along the limit rod 308. In the process of screwing out the locking stud 307, the transmission stud 302 drives the toothed disc 304 to move upward synchronously with the gear 305 under the action of the thread of the support plate 301, so that the toothed disc 304 always maintains a meshing state with the gear 305 until the locking stud 307 is completely screwed out of the end cover 201.

[0032] Working principle: Rotate the hand wheel 303 to drive the toothed disc 304 to rotate through the transmission stud 302, and the toothed disc 304 engages with the eight gears 305 to drive the pressing block 306 and the locking stud 307 to rotate, and the eight locking studs 307 are synchronously screwed upward out of the end cover 201 along the limit rod 308. In the process of screwing out the locking stud 307, the transmission stud 302 drives the toothed disc 304 to move upward synchronously with the gear 305 under the action of the thread of the support plate 301, so that the toothed disc 304 always maintains a meshing state with the gear 305 until the locking stud 307 is completely screwed out of the end cover 201, open the kettle cover 202, and add the solid raw material into the kettle body 101 through the feeding pipe 105, and the liquid The raw materials are added to the kettle body 101 through the liquid inlet pipe 104; after the raw materials are added, the kettle cover 202 is covered again, and the positioning block 203 is inserted into the corresponding position on the end cover 201, and the above steps are repeated to screw the locking stud 307 into the end cover 201 again, and the kettle cover 202 is synchronously pressed by eight pressing blocks 306, so that the kettle cover 202 cooperates with the end cover 201 to press the first sealing gasket 204 and the second sealing gasket 205 that are staggered and re-sealed; after the sealing is completed, the stirring motor 103 drives the stirring rod 102 to rotate to stir and mix the raw materials, and at the same time, the kettle body 101 is heated through the jacket 107. After the reaction is completed, the finished product is discharged from the discharge pipe 106.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reactor for producing 2-amino-4,6-dimethoxypyrimidine, comprising a reaction device for containing, heating and stirring chemical raw materials, characterized in that: It also includes a sealing device installed on the top of the reaction device for positioning the double-sealed reaction kettle after locking, and a fixing device for eight-point synchronous rotation and locking sealing is arranged on the sealing device; The fixing device comprises a support plate (301), a transmission stud (302) is installed at the center of the support plate (301), the transmission stud (302) is threadedly connected to the support plate (301), a hand wheel (303) is installed on the top of the transmission stud (302), a toothed disc (304) is arranged at the bottom of the transmission stud (302), eight gears (305) are evenly meshed on the circumference of the toothed disc (304), a pressing block (306) is arranged under the gear (305), a locking stud (307) is arranged under the pressing block (306), and a limiting rod (308) is arranged on the gear (305).

2. A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to claim 1, characterized in that: The reaction device comprises a kettle body (101), a stirring rod (102) is rotatably mounted in the kettle body (101), a stirring motor (103) is arranged on the top of the stirring rod (102), two liquid inlet pipes (104) are symmetrically arranged on the front and rear sides of the stirring motor (103), a feeding pipe (105) is arranged on one side of the top of the kettle body (101), a discharging pipe (106) is arranged at the bottom of the kettle body (101), and a jacket (107) is installed outside the kettle body (101).

3. A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to claim 1, characterized in that: The sealing device comprises an end cover (201), a kettle cover (202) is arranged on the end cover (201), a plurality of positioning blocks (203) are evenly arranged on the circumference of the junction between the end cover (201) and the kettle cover (202), a first sealing gasket (204) is arranged between the end cover (201) and the kettle cover (202), a second sealing gasket (205) is arranged outside the first sealing gasket (204), and the first sealing gasket (204) and the second sealing gasket (205) are arranged alternately up and down.

4. A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to claim 1, characterized in that: The limiting rod (308) is cylindrical in shape, and the limiting rod (308) is slidably connected to the supporting plate (301).

5. A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to claim 3, characterized in that: The support plate (301) is connected to the kettle cover (202) by welding, and the locking stud (307) is threadedly connected to the end cover (201).

6. A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to claim 2, characterized in that: The feed pipe (105) is connected to the kettle body (101) by welding.

7. A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to claim 3, characterized in that: Four positioning blocks (203) are provided, and the positioning blocks (203) and the kettle cover (202) are integrally formed.

8. A reaction kettle for producing 2-amino-4,6-dimethoxypyrimidine according to claim 3, characterized in that: The first sealing pad (204) is made of silicone.

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