Imidacloprid technical preparation device

Abstract

The invention discloses an imidacloprid active compound preparation device, and belongs to the technical field of active compound preparation, the imidacloprid active compound preparation device comprises a feeding device used for feeding hydrogen peroxide and 3-picoline, and the feeding device is provided with a modification device used for feeding phosphine oxychloride, chlorine, ethylenediamine and 2-nitroguanidine respectively; a crystallization device for crystallizing a product is arranged on the modification device. The feeding device can achieve intermittent feeding of raw materials, the reaction time of subsequent reactions is guaranteed, meanwhile, intermittent feeding of other raw materials in the modification device is matched, all reactions in active compound preparation are automatically and synergistically carried out, and the automation degree is high; the motor rotates to drive the transverse transmission belt to continuously rotate, and the transverse transmission belt is continuously and intermittently matched with the jacking triangular block, the transmission gear and the pressing frame through the driving triangular block and the butt joint tooth group on the transverse transmission belt, so that feeding and reaction of all raw materials are orderly and automatically carried out, and the continuity is good.

Description

Technical Field

[0001] The invention relates to the technical field of technical preparation of technical materials, and in particular to a device for preparing the technical material of imidacloprid. Background Art

[0002] Imidacloprid is a highly effective, low-toxic, low-residue broad-spectrum insecticide belonging to the neonicotinoid insecticide class. It is commonly used to control pests such as aphids, whiteflies, underground pests, etc. A good effect can be exerted one day after the medication, and the residual effect can last for about 25 days. It is currently widely used in crops such as rice, wheat, and cotton. The preparation of imidacloprid has undergone long-term development, and the preparation method has also been improved many times. Currently, there are two main types of industrial production, one is cyclization followed by condensation, and the other is front-back cyclization. The two processes have their own advantages and disadvantages, and can be selected according to actual production conditions. The most commonly used process is to use 3-methylpyridine as the starting material, first oxidize it to pyridine nitrogen oxide using hydrogen peroxide, use trichlorophosphine as a chlorination reagent to introduce a halogen at the C2 position of pyridine, and then use chlorine to chloromethylate the benzyl position to obtain the key intermediate 2-chloro-5-chloromethylpyridine, and then the intermediate directly undergoes a substitution reaction with ethylenediamine to introduce a side chain, and finally dehydrates and condenses with 2-nitroguanidine to obtain the target product. The imidacloprid technical preparation device in the prior art is usually unable to achieve a fully automatic preparation process, and the degree of automation is insufficient. Summary of the invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is: a device for preparing imidacloprid technical, comprising a feeding device for feeding hydrogen peroxide and 3-picoline, the feeding device comprising a spherical shell, the feeding device is provided with a modification device for feeding trichlorophosphine oxide, chlorine, ethylenediamine and 2-nitroguanidine respectively, the modification device comprises a bottom tube, the bottom tube is fixedly installed under the spherical shell, the modification device is provided with a crystallization device for crystallizing the product, the crystallization device comprises a riser, and the riser is fixedly installed on the bottom tube.

[0004] Furthermore, the feeding device includes two feeding pipes fixedly mounted on the spherical shell, which are used to introduce hydrogen peroxide and 3-picoline respectively. A top plug is provided on the spherical shell, and side rotating cylinders are fixedly mounted on both sides of the spherical shell.

[0005] Furthermore, a material receiving box is rotatably installed in the spherical shell, and the material receiving box consists of two quarter-spherical liquid collecting chambers, and the opening directions of the two liquid collecting chambers are opposite. A rotating column is fixedly installed on the material receiving box, and the rotating column is rotatably installed in the side rotating drum, and a rotating gear is fixedly installed on the rotating column.

[0006] Furthermore, a blocking plate is slidably installed in the feed pipe, a lifting frame is fixedly installed on the blocking plate, and lifting triangle blocks are fixedly installed on both sides of the lifting frame.

[0007] Hydrogen peroxide and 3-picoline are introduced from two feed pipes respectively. The feed pipes are blocked by the blocking plate in the initial state. When the lifting triangle block is lifted up, the lifting frame and the blocking plate are driven to rise. At this time, the hydrogen peroxide and 3-picoline in the feed pipe enter the receiving box. The hydrogen peroxide and 3-picoline generate pyridine nitrogen oxide in the receiving box. Then, when the rotating gear is rotated, the rotating gear, the rotating column and the receiving box rotate together, and the pyridine nitrogen oxide is poured into the bottom tube.

[0008] Furthermore, the modification device comprises four barrels fixedly mounted on the bottom tube, and the barrels are respectively filled with phosphine oxychloride, chlorine, ethylenediamine and 2-nitroguanidine.

[0009] Furthermore, a one-way column is slidably installed in the bottom tube, a one-way plate is fixedly installed on the one-way column, a one-way spring is arranged between the one-way column and the bottom tube, the one-way plate divides the bottom tube into left and right sides, two barrels are located on the side of the bottom tube close to the spherical shell, two barrels are located on the side of the bottom tube close to the riser, the two barrels located on the side close to the spherical shell are respectively filled with trichlorophosphine and chlorine, and the two barrels located on the side close to the riser are respectively filled with ethylenediamine and 2-nitroguanidine.

[0010] Furthermore, a sliding column is fixedly installed on the bottom tube, a downward pressure inner cylinder is slidably installed on the sliding column, a plurality of downward pressure springs are arranged between the downward pressure inner cylinder and the bottom tube, a downward pressure frame is fixedly installed on the downward pressure inner cylinder, a fixed inner column is fixedly installed on the bottom tube, a plurality of opening pieces are rotatably installed in the downward pressure inner cylinder, a center column is fixedly installed in the bottom tube, and in an initial state, the center column and the plurality of opening pieces form a closed surface to prevent the raw materials in the barrel from falling into the bottom tube.

[0011] When the lower pressing frame is pressed down, the lower pressing inner cylinder is driven down. Due to the existence of the fixed inner column, the opening piece cannot be lowered, the lower pressing inner cylinder descends and the lower pressing spring is compressed, and the opening piece rotates relative to the lower pressing inner cylinder. At this time, the central column and several opening pieces no longer seal the lower part of the barrel, and the raw materials in the barrel fall into the bottom tube. When the lower pressing frame on the spherical shell side is pressed down, the lower pressing inner cylinders of the two barrels are driven down, so that the lower part of the barrel filled with trichlorophosphine and chlorine is opened, and trichlorophosphine and chlorine enter the bottom tube and mix with pyridine nitrogen oxide in the bottom tube. A halogen is introduced into the C2 position of pyridine as a chlorination reagent, and then chlorine is used to chloromethylate the benzyl position to obtain 2-chloro-5-chloropicoline. When the down-pressing frame on one side of the ascending tube is pressed down, the down-pressing inner cylinders of the two barrels are driven to descend, so that the lower part of the barrel containing ethylenediamine and 2-nitroguanidine is opened, and then the pump is started, so that ethylenediamine and 2-nitroguanidine enter the ascending tube and then enter the crystallization pool, driving the one-way column and the one-way sheet to slide along the bottom tube, the one-way spring is compressed, and 2-chloro-5-chloropicoline is also pumped into the crystallization pool.

[0012] Furthermore, the crystallization device includes a crystallization pool fixedly installed on the riser, a pump is provided in the crystallization pool, an exhaust pipe is fixedly provided on the top of the crystallization pool, a burner is provided at the bottom of the crystallization pool for heating the reactants inside the crystallization pool, and a cabinet door and an outlet are provided on the crystallization pool.

[0013] Furthermore, a gear shaft is rotatably installed on the ascending tube, and two driving gears are fixedly installed on the gear shaft. The two driving gears are respectively located on both sides of the bottom tube. A motor is arranged next to the ascending tube, and a motor gear is fixedly installed on the motor shaft of the motor. An oblique transmission belt is wound around the motor gear and the driving gear. A transmission wheel is rotatably installed outside the side rotating drum, and a transverse transmission belt is wound around the driving gear and the transmission wheel. Three driving triangle blocks are equidistantly arranged on the transverse transmission belt, and three groups of docking gear groups are equidistantly arranged on the transverse transmission belt.

[0014] The motor drives the motor gear to rotate, which drives the active gear to rotate through the oblique transmission belt, thereby driving the horizontal transmission belt to rotate, thereby driving the active triangular block and the docking gear group to move. When the inclined surface of the active triangular block contacts the inclined surface of the lifting triangular block, the lifting triangular block will be lifted up to achieve intermittent feeding. When the docking gear group is engaged with the rotating gear, the docking gear group drives the rotating gear to rotate one hundred and eighty degrees each time, so that the pyridine nitrogen oxide that has completed the reaction in the receiving box is poured out, and the other liquid collecting chamber is moved to the opening facing upward. When the inclined surface of the active triangular block contacts the lower pressure frame, the lower pressure frame will be pressed down. When the active triangular block passes through the lower pressure frame, the lower pressure spring rebounds, so that the lower pressure frame and the lower pressure inner cylinder are reset, so that the intermittent entry of raw materials in the barrel is achieved.

[0015] The 2-chloro-5-chloromethylpyridine in the crystallization pool directly undergoes a substitution reaction with ethylenediamine to introduce a side chain, and finally undergoes a dehydration condensation reaction with 2-nitroguanidine to obtain the final product. The final product is a mixture of water and imidacloprid. The burner at the bottom of the crystallization pool heats the product to evaporate the water therein and discharge it from the exhaust pipe. Finally, the cabinet door or the discharge port of the crystallization pool is opened to take out the imidacloprid technical.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) the feeding device provided in the present invention can realize intermittent feeding of raw materials, ensure the reaction time of subsequent reactions, and cooperate with the intermittent feeding of other raw materials in the modification device to realize automatic and coordinated progress of all reactions in the preparation of the original drug, with a high degree of automation; (2) the rotation of the motor provided in the present invention drives the horizontal transmission belt to rotate continuously, and the active triangular block and the docking gear group thereon continuously and intermittently cooperate with the lifting triangular block, the transmission gear and the lower pressure frame to realize the orderly and automatic feeding and reaction of each raw material, with good continuity; (3) when the pump provided in the present invention is not started, the one-way sheet divides the bottom tube into two parts. After the reaction of the raw materials in the part close to the spherical shell is completed, the intermediate product formed by the reaction and the subsequent raw materials are pumped into the crystallization pool together through the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 The structure of the feeding device of the present invention is shown in FIG. Figure 1 .

[0019] Figure 3 The structure of the feeding device of the present invention is shown in FIG. Figure 2 .

[0020] Figure 4 The structure of the feeding device of the present invention is shown in FIG. Figure 3 .

[0021] Figure 5 The structure of the modification device of the present invention is shown in FIG. Figure 1 .

[0022] Figure 6 The structure of the modification device of the present invention is shown in FIG. Figure 2 .

[0023] Figure 7 The structure of the modification device of the present invention is shown in FIG. Figure 3 .

[0024] Figure 8 for Figure 7 Schematic diagram of the local structure at point A in the middle.

[0025] Fig. 9 It is a schematic diagram of the structure of the crystallization device of the present invention.

[0026] Reference numerals: 101-ball shell; 102-feeding pipe; 103-top plug; 104-lifting frame; 105-lifting triangle block; 106-blocking plate; 107-receiving box; 108-rotating column; 109-rotating gear; 110-side rotating cylinder; 201-bottom tube; 202-barrel; 203-pressing frame; 204-one-way sheet; 205-one-way column; 206-one-way spring; 207-pressing inner cylinder ; 208-downward pressure spring; 209-opening piece; 210-fixed inner column; 211-center column; 212-sliding column; 301-rising pipe; 302-pump; 303-exhaust pipe; 304-crystallization pool; 305-motor; 306-motor gear; 307-driving gear; 308-oblique transmission belt; 309-horizontal transmission belt; 310-driving triangle block; 311-jointing gear set; 312-gear shaft. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] Example: Reference Figure 1-Figure 9A device for preparing imidacloprid technical, including a feeding device for feeding hydrogen peroxide and 3-picoline, the feeding device including a spherical shell 101, a modification device for feeding trichlorophosphine oxide, chlorine, ethylenediamine and 2-nitroguanidine respectively, the modification device including a bottom tube 201, the bottom tube 201 is fixedly installed below the spherical shell 101, the modification device is provided with a crystallization device for crystallizing the product, the crystallization device including a rising tube 301, the rising tube 301 is fixedly installed on the bottom tube 201.

[0029] like Figure 2-Figure 4 As shown, the feeding device includes two feeding pipes 102 fixedly mounted on the spherical shell 101, which are used to introduce hydrogen peroxide and 3-picoline respectively. A top plug 103 is provided on the spherical shell 101, and side rotating drums 110 are fixedly mounted on both sides of the spherical shell 101.

[0030] like Figure 2-Figure 4 As shown, a material receiving box 107 is rotatably installed in the spherical shell 101. The material receiving box 107 consists of two quarter-spherical liquid collecting chambers, and the opening directions of the two liquid collecting chambers are opposite. A rotating column 108 is fixedly installed on the material receiving box 107. The rotating column 108 is rotatably installed in the side rotating drum 110, and a rotating gear 109 is fixedly installed on the rotating column 108.

[0031] like Figure 2-Figure 4 As shown, a blocking plate 106 is slidably installed in the feed pipe 102 , a lifting frame 104 is fixedly installed on the blocking plate 106 , and lifting triangle blocks 105 are fixedly installed on both sides of the lifting frame 104 .

[0032] Hydrogen peroxide and 3-picoline are introduced from two feed pipes 102 respectively. The feed pipe 102 is blocked by the blocking plate 106 in the initial state. When the lifting triangle block 105 is lifted up, the lifting frame 104 and the blocking plate 106 are driven to rise. At this time, the hydrogen peroxide and 3-picoline in the feed pipe 102 enter the material receiving box 107. The hydrogen peroxide and 3-picoline generate pyridine nitrogen oxide in the material receiving box 107. Then, when the rotating gear 109 is rotated, the rotating gear 109, the rotating column 108 and the material receiving box 107 rotate together to pour the pyridine nitrogen oxide into the bottom tube 201.

[0033] like Figure 5-Figure 8 As shown, the modification device includes four barrels 202 fixedly mounted on a bottom tube 201, and the barrels 202 are respectively filled with phosphine oxide, chlorine, ethylenediamine and 2-nitroguanidine.

[0034] like Figure 5-Figure 8As shown, a one-way column 205 is slidably installed in the bottom tube 201, a one-way sheet 204 is fixedly installed on the one-way column 205, a one-way spring 206 is arranged between the one-way column 205 and the bottom tube 201, the one-way sheet 204 divides the bottom tube 201 into left and right sides, two barrels 202 are located on the side of the bottom tube 201 close to the spherical shell 101, and two barrels 202 are located on the side of the bottom tube 201 close to the rising tube 301. The two barrels 202 located on the side close to the spherical shell 101 are respectively filled with trichlorophosphine and chlorine, and the two barrels 202 located on the side close to the rising tube 301 are respectively filled with ethylenediamine and 2-nitroguanidine.

[0035] like Figure 5-Figure 8 As shown, a sliding column 212 is fixedly installed on the bottom tube 201, a downward pressing inner cylinder 207 is slidably installed on the sliding column 212, a plurality of downward pressing springs 208 are arranged between the downward pressing inner cylinder 207 and the bottom tube 201, a downward pressing frame 203 is fixedly installed on the downward pressing inner cylinder 207, a fixed inner column 210 is fixedly installed on the bottom tube 201, a plurality of opening pieces 209 are rotatably installed in the downward pressing inner cylinder 207, a center column 211 is fixedly installed in the bottom tube 201, and in the initial state, the center column 211 and the plurality of opening pieces 209 form a closed surface to prevent the raw materials in the barrel 202 from falling into the bottom tube 201.

[0036] When the lower pressing frame 203 is pressed down, the pressing inner cylinder 207 is driven to descend. Due to the existence of the fixed inner column 210, the opening piece 209 cannot descend. The pressing inner cylinder 207 descends and the pressing spring 208 is compressed. The opening piece 209 rotates relative to the pressing inner cylinder 207. At this time, the central column 211 and the plurality of opening pieces 209 no longer seal the lower part of the barrel 202. The raw materials in the barrel 202 fall into the bottom tube 201. When the lower pressing frame 203 on the side of the spherical shell 101 is pressed down, the pressing inner cylinders 207 of the two barrels 202 are driven to descend, so that the lower part of the barrel 202 filled with trichlorophosphine and chlorine is opened, and the trichlorophosphine and chlorine enter the bottom tube 201 and react with the pyridine nitrogen in the bottom tube 201. The oxides are mixed, trichlorophosphine is used as a chlorinating agent to introduce halogen at the C2 position of pyridine, and then chlorine is used to chloromethylate the benzyl position to obtain 2-chloro-5-chloropicoline. When the lower pressure frame 203 located on one side of the ascending tube 301 is pressed down, the lower pressure inner cylinder 207 of the two barrels 202 is driven to descend, so that the lower part of the barrel 202 containing ethylenediamine and 2-nitroguanidine is opened, and then the pump 302 is started, so that ethylenediamine and 2-nitroguanidine enter the ascending tube 301 and then enter the crystallization pool 304, driving the one-way column 205 and the one-way sheet 204 to slide along the bottom tube 201, the one-way spring 206 is compressed, and 2-chloro-5-chloropicoline is also pumped into the crystallization pool 304.

[0037] like Fig. 9As shown, the crystallization device includes a crystallization pool 304 fixedly mounted on a riser 301, a pump 302 is arranged in the crystallization pool 304, an exhaust pipe 303 is fixedly arranged on the top of the crystallization pool 304, a burner is arranged at the bottom of the crystallization pool 304 for heating the reactants inside the crystallization pool 304, and a cabinet door and an outlet are arranged on the crystallization pool 304.

[0038] like Fig. 9 As shown, a gear shaft 312 is rotatably installed on the ascending tube 301, and two driving gears 307 are fixedly installed on the gear shaft 312. The two driving gears 307 are respectively located on both sides of the bottom tube 201. A motor 305 is arranged beside the ascending tube 301, and a motor gear 306 is fixedly installed on the motor shaft of the motor 305. An oblique transmission belt 308 is wound around the motor gear 306 and the driving gear 307. A transmission wheel is rotatably installed outside the side rotating drum 110, and a horizontal transmission belt 309 is wound around the driving gear 307 and the transmission wheel. Three driving triangle blocks 310 are equidistantly arranged on the horizontal transmission belt 309, and three groups of docking tooth groups 311 are equidistantly arranged on the horizontal transmission belt 309.

[0039] The motor 305 drives the motor gear 306 to rotate, and drives the driving gear 307 to rotate through the inclined transmission belt 308, thereby driving the horizontal transmission belt 309 to rotate, thereby driving the active triangular block 310 and the docking gear set 311 to move. When the inclined surface of the active triangular block 310 contacts the inclined surface of the lifting triangular block 105, the lifting triangular block 105 will be lifted to achieve intermittent feeding. When the docking gear set 311 is engaged with the rotating gear 109, the docking gear set 311 drives the rotating gear 109 to rotate 180 degrees each time, so as to pour out the pyridine nitrogen oxide that has been reacted in the receiving box 107, and move the other liquid collecting chamber to open upward. When the inclined surface of the active triangular block 310 contacts the lower pressing frame 203, the lower pressing frame 203 will be pressed down. When the active triangular block 310 passes through the lower pressing frame 203, the downward pressing spring 208 rebounds, so that the lower pressing frame 203 and the downward pressing inner cylinder 207 are reset, so that the intermittent entry of the raw materials in the barrel 202 is achieved.

[0040] The 2-chloro-5-chloromethylpyridine in the crystallization pool 304 directly undergoes a substitution reaction with ethylenediamine to introduce a side chain, and finally undergoes a dehydration condensation reaction with 2-nitroguanidine to obtain a final product. The final product is a mixture of water and imidacloprid. The burner at the bottom of the crystallization pool 304 heats the product so that the water therein evaporates and is discharged from the exhaust pipe 303. Finally, the cabinet door or the discharge port of the crystallization pool 304 is opened to take out the imidacloprid technical.

[0041] The working principle of the imidacloprid technical preparation device disclosed in the present invention is as follows: hydrogen peroxide and 3-methylpyridine are introduced from two feed pipes 102 respectively, the feed pipe 102 is blocked by the blocking plate 106 in the initial state, the motor 305 drives the motor gear 306 to rotate, and the driving gear 307 is driven to rotate through the inclined transmission belt 308, thereby driving the horizontal transmission belt 309 to rotate, thereby driving the active triangular block 310 and the docking gear set 311 to move, and the inclined surface of the active triangular block 310 is connected with the inclined surface of the lifting triangular block 105. When touched, the lifting triangle block 105 will be lifted up to realize intermittent feeding. When the lifting triangle block 105 is lifted up, the lifting frame 104 and the blocking plate 106 are driven to rise. At this time, the hydrogen peroxide and 3-picoline in the feeding pipe 102 enter the receiving box 107, and the hydrogen peroxide and 3-picoline generate pyridine nitrogen oxide in the receiving box 107. Then, when the rotating gear 109 is rotated, the rotating gear 109, the rotating column 108 and the receiving box 107 rotate together to pour the pyridine nitrogen oxide into the bottom tube 201. When the docking tooth set 311 is meshed with the rotating gear 109, the docking tooth set 311 drives the rotating gear 109 to rotate 180 degrees each time, so that the pyridine nitrogen oxide that has been reacted in the receiving box 107 is poured out, and the other liquid collecting chamber is moved to open upward. When the inclined surface of the active triangular block 310 contacts the lower pressing frame 203, the lower pressing frame 203 is pressed down. When the lower pressing frame 203 is pressed down, the lower pressing inner cylinder 207 is driven to descend. Due to the existence of the fixed inner column 210, the opening piece The lower pressing inner cylinder 207 is lowered and the lower pressing spring 208 is compressed, and the opening piece 209 rotates relative to the lower pressing inner cylinder 207. At this time, the central column 211 and the plurality of opening pieces 209 no longer seal the lower part of the barrel 202, and the raw materials in the barrel 202 fall into the bottom tube 201. When the lower pressing frame 203 on the side of the spherical shell 101 is pressed down, the lower pressing inner cylinders 207 of the two barrels 202 are driven to descend, so that the lower part of the barrel 202 filled with trichlorophosphine and chlorine is opened, and the trichlorophosphine is released. Phosphine and chlorine enter the bottom tube 201 and mix with pyridine nitrogen oxide in the bottom tube 201. Phosphine oxychloride is used as a chlorinating agent to introduce halogen at the C2 position of pyridine, and then chlorine is used to chloromethylate the benzyl position to obtain 2-chloro-5-chloromethylpyridine. When the lower pressure frame 203 located on one side of the ascending tube 301 is pressed down, the lower pressure inner cylinders 207 of the two barrels 202 are driven to descend, so that the lower part of the barrel 202 containing ethylenediamine and 2-nitroguanidine is opened, and then the pump 30 is pumped. 2 is started, so that ethylenediamine and 2-nitroguanidine enter into the ascending tube 301 and then into the crystallization pool 304, driving the one-way column 205 and the one-way sheet 204 to slide along the bottom tube 201, the one-way spring 206 is compressed, and 2-chloro-5-chloropicoline is also drawn into the crystallization pool 304. When the active triangular block 310 passes through the lower pressure frame 203, the lower pressure spring 208 rebounds, so that the lower pressure frame 203 and the lower pressure inner cylinder 207 are reset, and the intermittent entry of the raw materials in the barrel 202 is realized.The 2-chloro-5-chloromethylpyridine in the crystallization pool 304 directly undergoes a substitution reaction with ethylenediamine to introduce a side chain, and finally undergoes a dehydration condensation reaction with 2-nitroguanidine to obtain a final product. The final product is a mixture of water and imidacloprid. The burner at the bottom of the crystallization pool 304 heats the product so that the water therein evaporates and is discharged from the exhaust pipe 303. Finally, the cabinet door or the discharge port of the crystallization pool 304 is opened to take out the imidacloprid technical.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for preparing imidacloprid technical drug, comprising a feeding device for feeding hydrogen peroxide and 3-picoline, characterized in that: The feeding device comprises a spherical shell (101), and a modification device for respectively feeding trichlorophosphine, chlorine, ethylenediamine and 2-nitroguanidine is arranged on the feeding device. The modification device comprises a bottom tube (201), and the bottom tube (201) is fixedly installed below the spherical shell (101). The modification device is provided with a crystallization device for crystallizing the product, and the crystallization device comprises a riser (301), and the riser (301) is fixedly installed on the bottom tube (201).

2. A device for preparing imidacloprid original medicine according to claim 1, characterized in that: The feeding device comprises two feeding pipes (102) fixedly mounted on the spherical shell (101), which are used to respectively introduce hydrogen peroxide and 3-picoline. A top plug (103) is provided on the spherical shell (101), and side rotating cylinders (110) are fixedly mounted on both sides of the spherical shell (101).

3. A device for preparing imidacloprid original medicine according to claim 2, characterized in that: A material receiving box (107) is rotatably mounted in the spherical shell (101). The material receiving box (107) is composed of two quarter-spherical liquid collecting chambers. The opening directions of the two liquid collecting chambers are opposite. A rotating column (108) is fixedly mounted on the material receiving box (107). The rotating column (108) is rotatably mounted in the side rotating drum (110). A rotating gear (109) is fixedly mounted on the rotating column (108).

4. A device for preparing imidacloprid original medicine according to claim 2, characterized in that: A blocking plate (106) is slidably mounted inside the feed pipe (102), a lifting frame (104) is fixedly mounted on the blocking plate (106), and lifting triangle blocks (105) are fixedly mounted on both sides of the lifting frame (104).

5. The device for preparing imidacloprid technical material according to claim 1, characterized in that: The modification device comprises four barrels (202) fixedly mounted on a bottom tube (201), wherein the barrels (202) are respectively filled with phosphine oxychloride, chlorine, ethylenediamine and 2-nitroguanidine.

6. The device for preparing imidacloprid technical material according to claim 5, characterized in that: A one-way column (205) is slidably mounted in the bottom tube (201), a one-way plate (204) is fixedly mounted on the one-way column (205), a one-way spring (206) is arranged between the one-way column (205) and the bottom tube (201), the one-way plate (204) divides the bottom tube (201) into left and right sides, two barrels (202) are located on a side of the bottom tube (201) close to the spherical shell (101), and two barrels (202) are located on a side of the bottom tube (201) close to the rising tube (301), trichlorophosphine and chlorine are respectively contained in the two barrels (202) on the side close to the spherical shell (101), and ethylenediamine and 2-nitroguanidine are respectively contained in the two barrels (202) on the side close to the rising tube (301).

7. The device for preparing imidacloprid technical material according to claim 5, characterized in that: A sliding column (212) is fixedly mounted on the bottom tube (201), a downward pressure inner cylinder (207) is slidably mounted on the sliding column (212), a plurality of downward pressure springs (208) are arranged between the downward pressure inner cylinder (207) and the bottom tube (201), a downward pressure frame (203) is fixedly mounted on the downward pressure inner cylinder (207), a fixed inner column (210) is fixedly mounted on the bottom tube (201), a plurality of opening pieces (209) are rotatably mounted in the downward pressure inner cylinder (207), a central column (211) is fixedly mounted in the bottom tube (201), and in an initial state, the central column (211) and the plurality of opening pieces (209) form a closed surface to prevent the raw materials in the barrel (202) from falling into the bottom tube (201).

8. The device for preparing imidacloprid technical material according to claim 2, characterized in that: The crystallization device comprises a crystallization pool (304) fixedly mounted on a riser (301), a pump (302) being arranged in the crystallization pool (304), an exhaust pipe (303) being fixedly arranged at the top of the crystallization pool (304), a burner being arranged at the bottom of the crystallization pool (304) for heating reactants inside the crystallization pool (304), and a cabinet door and an exhaust port being arranged on the crystallization pool (304).

9. The device for preparing imidacloprid technical material according to claim 8, characterized in that: A gear shaft (312) is rotatably mounted on the ascending tube (301), two driving gears (307) are fixedly mounted on the gear shaft (312), and the two driving gears (307) are respectively located on both sides of the bottom tube (201). A motor (305) is arranged beside the ascending tube (301), a motor gear (306) is fixedly mounted on the motor shaft of the motor (305), an oblique transmission belt (308) is wound around the motor gear (306) and the driving gear (307), a transmission wheel is rotatably mounted outside the side rotating drum (110), a transverse transmission belt (309) is wound around the driving gear (307) and the transmission wheel, three driving triangle blocks (310) are equidistantly arranged on the transverse transmission belt (309), and three groups of butt gear groups (311) are equidistantly arranged on the transverse transmission belt (309).

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