A multi-stage filtering and separating device for purifying 2-bromo-4-nitroimidazole

Abstract

This utility model discloses a multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole, including a shell. A vacuum pump is fixedly connected to the shell. An air extraction pipe is connected and fixed to the input end of the vacuum pump. A first connector is connected and fixed to the input end of the air extraction pipe. A hollow shaft motor is installed on the first connector. A hollow shaft body is connected and fixed to the output end of the hollow shaft motor. A second connector is connected and fixed to the bottom end of the hollow shaft body. A filter tube is connected and fixed to the second connector. This utility model uses a filter screen combined with a filter tube to achieve multi-stage filtration. The filter screen is automatically fed by a first feeding inclined plate, and the filter tube is automatically fed by a spiral blade. This can reduce labor costs and improve production efficiency. The filter tube is driven by a hollow shaft motor, and the centrifugal force generated by the rotation prevents the filter tube from clogging, thereby ensuring filtration efficiency. Furthermore, the filter tube and the spiral blade are linked by an elastic pawl and a ratchet ring, which can reduce equipment costs.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, and in particular to a multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole. Background Technology

[0002] 2-Bromo-4-nitroimidazole is an organic synthesis intermediate and pharmaceutical intermediate, used in laboratory research and development processes and chemical and pharmaceutical synthesis. Crude 2-bromo-4-nitroimidazole requires purification. The crude solution is rapidly dissolved using a thin-film evaporator to obtain a concentrated solution. This concentrated solution is transferred to a crystallization vessel, where crystals are precipitated by temperature-controlled stirring. The crystals are then separated by filtration and dried to obtain the final product. Multi-stage filtration is typically used to separate the crystals and minimize crystal loss.

[0003] Existing multi-stage filtration equipment, such as the multi-stage filtration device for pharmaceutical production disclosed in Chinese Utility Model Patent No. CN220824516U, involves adding the drug to be filtered into the first filtration chamber. Under the action of the filter plates, large particulate impurities in the drug undergo preliminary filtration and separation. The drug, after preliminary filtration, then enters the second filtration chamber through a connecting pipe, passes through the filter tube to the inner tube for secondary filtration, and is discharged through the outlet pipe. This achieves multi-stage filtration of the drug in a single operation, simplifying the filtration process and improving filtration efficiency. The equipment is equipped with a pump, an air extraction pipe, and an air extraction head. During operation, the pump continuously extracts air from the inner tube to reduce the air pressure inside the inner tube, creating a pressure difference between the inside and outside of the filter tube, thereby accelerating the filtration speed and further improving filtration efficiency.

[0004] However, the above-mentioned multi-stage filtration equipment has the following disadvantages when used for the purification of 2-bromo-4-nitroimidazole: 1. It lacks a material collection device, and the solid matter filtered out by the filter plate and filter tube cannot be automatically collected and discharged from the equipment. Manual collection will undoubtedly lead to a decrease in production efficiency; 2. Due to the design of using air extraction to accelerate filtration, the solid matter filtered out by the filter tube is easily adsorbed on the filter pores, which leads to a decrease in the effective filtration area of ​​the filter tube, thereby reducing the filtration efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole, comprising a shell, a vacuum pump fixedly connected to the shell, an air extraction pipe fixedly connected to the input end of the vacuum pump, a first connector fixedly connected to the input end of the air extraction pipe, a hollow shaft motor mounted on the first connector, a hollow shaft body fixedly connected to the output end of the hollow shaft motor, a second connector fixedly connected to the bottom end of the hollow shaft body, a filter tube fixedly connected to the second connector, and the filter tube is hinged inside the shell, a ratchet ring fixedly connected to the filter tube, multiple elastic pawls meshing on the ratchet ring, a connecting rod fixedly connected to the elastic pawls, a spiral blade sleeved inside the shell, and a connecting rod fixedly connected to the spiral blade, a scraper fixedly connected to the spiral blade, a collection trough opened inside the shell, and a scraper slidably connected to the collection trough, a second discharge port opened inside the collection trough, and a second discharge inclined plate fixedly connected to the second discharge port.

[0007] Preferably, a mounting bracket is fixedly connected to the hollow shaft motor, and the mounting bracket is fixedly connected inside the housing.

[0008] Preferably, a guide plate is provided at the top of the collection trough, and the guide plate is fixedly connected to the shell.

[0009] Preferably, a filter screen is provided at the top of the mounting frame, and two transmission rollers are drivenly connected to the filter screen. The transmission rollers are rotatably connected to the housing. A motor body is fixedly connected to the housing, and the output end of the motor body is fixedly connected to one of the transmission rollers.

[0010] Preferably, a first guide strip is provided at the top of the filter screen, and a second guide strip is sleeved inside the filter screen, and both the first guide strip and the second guide strip are fixedly connected inside the housing.

[0011] Preferably, a first discharge port is provided on the housing at the position corresponding to the filter screen, and a first discharge inclined plate is fixedly connected inside the first discharge port, and the first discharge inclined plate is disposed on one side of the filter screen.

[0012] Preferably, a drain pipe is fixedly connected to the lower surface of the housing at the position corresponding to the filter pipe.

[0013] This invention provides a multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole. Its advantages are as follows: This invention utilizes a filter screen combined with a filter tube to achieve multi-stage filtration. The filter screen is automatically fed using a first feeding inclined plate, and the filter tube is automatically fed using spiral blades. This reduces labor costs and improves production efficiency. The filter tube is driven by a hollow shaft motor, utilizing the centrifugal force generated by rotation to prevent clogging, thus ensuring filtration efficiency. Furthermore, the filter tube and spiral blades are linked through elastic pawls and ratchet rings, which reduces equipment costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall three-dimensional cross-sectional structure of this utility model;

[0017] Figure 3 for Figure 2 Enlarged view of the structure of region A in the middle;

[0018] Figure 4 for Figure 2 Enlarged view of the structure of region B in the middle;

[0019] Figure 5 This is a three-dimensional structural diagram of the shell of this utility model.

[0020] In the diagram: 1. Housing; 11. Mounting bracket; 12. Guide plate; 13. Drain pipe; 2. Motor body; 21. Filter screen; 22. Drive roller; 23. First guide bar; 24. Second guide bar; 25. First discharge port; 26. First discharge ramp; 3. Vacuum pump; 31. Suction pipe; 32. First connector; 33. Hollow shaft motor; 34. Hollow shaft body; 35. Second connector; 36. Filter pipe; 37. Ratchet ring; 38. Spiral blade; 39. Connecting rod; 310. Elastic pawl; 311. Scraper; 312. Collection trough; 313. Second discharge port; 314. Second discharge ramp. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Please see the appendix Figure 1 - Appendix Figure 5This utility model provides an embodiment of a multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole, comprising a housing 1, a vacuum pump 3 fixedly connected to the housing 1, an air extraction pipe 31 connected to the input end of the vacuum pump 3, a first connector 32 connected to the input end of the air extraction pipe 31, a hollow shaft motor 33 mounted on the first connector 32, a hollow shaft body 34 connected to the output end of the hollow shaft motor 33, a second connector 35 connected to the bottom end of the hollow shaft body 34, a filter tube 36 connected to the second connector 35 and hinged inside the housing 1, a ratchet ring 37 fixedly connected to the filter tube 36, and multiple elastic pawls 310 engaged on the ratchet ring 37. A connecting rod 39 is fixedly connected to the upper part of the housing 1. A spiral blade 38 is sleeved inside the housing 1, and the connecting rod 39 is fixedly connected to the spiral blade 38. A scraper 311 is fixedly connected to the spiral blade 38. A material collection trough 312 is opened inside the housing 1, and the scraper 311 is slidably connected inside the material collection trough 312. A second discharge port 313 is opened inside the material collection trough 312, and a second discharge inclined plate 314 is fixedly connected inside the second discharge port 313. A vacuum pump 3 is used to evacuate the filter tube 36. The air extraction pipe 31, the first connector 32, the output shaft of the hollow shaft motor 33, the hollow shaft body 34, and the second connector 35 constitute the air extraction path. At the same time, the hollow shaft motor 33 is also used to drive the hollow shaft body 34, which drives the filter tube. The filter tube 36 rotates, filtering small crystal particles. When the filter tube 36 reverses, the ratchet ring 37 drives the elastic pawl 310. The elastic pawl 310 drives the spiral blade 38 via the connecting rod 39. The spiral blade 38 feeds the small crystal particles into the collection tank 312. The scraper 311 pushes the small crystal particles in the collection tank 312 into the second discharge port 313, allowing them to exit through the second discharge inclined plate 314. A mounting bracket 11 is fixedly connected to the hollow shaft motor 33 and is fixedly connected inside the housing 1. The mounting bracket 11 is used to install the hollow shaft motor 33. A guide plate 12 is provided at the top of the collection tank 312 and is fixedly connected inside the housing 1. The guide plate 12 is used to guide the solution and prevent... The solution is prevented from entering the collection tank 312; a filter screen 21 is provided at the top of the mounting frame 11, and two drive rollers 22 are connected to the filter screen 21. The drive rollers 22 are rotatably connected to the housing 1. A motor body 2 is fixedly connected to the housing 1, and the output end of the motor body 2 is fixedly connected to one of the drive rollers 22. The filter screen 21 is used for preliminary filtration of the solution to intercept large crystal particles. The motor body 2 drives the filter screen 21 through the drive rollers 22. A first guide strip 23 is provided at the top of the filter screen 21, and a second guide strip 24 is sleeved inside the filter screen 21. Both the first guide strip 23 and the second guide strip 24 are fixedly connected to the housing 1. The first guide strip 23 and the second guide strip 24 are used to guide the filter screen 21.A first outlet 25 is provided on the housing 1 at the position corresponding to the filter screen 21. A first discharge ramp 26 is fixedly connected inside the first outlet 25 and is located on one side of the filter screen 21. The first discharge ramp 26 is used to intercept the crystals filtered by the filter screen 21, and the first outlet 25 is used to discharge the crystals. A drain pipe 13 is connected and fixed on the lower surface of the housing 1 at the position corresponding to the filter tube 36. The drain pipe 13 is used to discharge the filtrate filtered by the filter tube 36.

[0023] Working Principle: When using this invention, a solution containing crystals is fed onto the filter screen 21 inside the housing 1. Large crystal particles are intercepted by the filter screen 21, while small crystal particles and the solution pass through the filter screen 21 and are guided to the outside of the filter tube 36 via the guide plate 12. The drain valve on the drain pipe 13 is closed, and the vacuum pump 3 and the hollow shaft motor 33 are started. The vacuum pump 3 creates a vacuum in the filter tube 36 via the suction pipe 31, the first connector 32, the hollow shaft body 34, and the second connector 35, creating a pressure difference between the inside and outside of the filter tube 36, accelerating the entry of the solution into the filter tube 36. The solution is temporarily stored in the drain pipe 13, and the hollow shaft motor 33 drives the filter tube 36 via the hollow shaft body 34. The rotation of the filter tube 36 generates centrifugal force, which throws away the small crystal particles attached to the surface. Once the solution has completely entered the drain pipe 13, the vacuuming can be stopped, the drain valve can be opened, and the solution can be discharged. Then, the hollow shaft motor 33 is reversed to drive the filter tube 36. When tube 36 is reversed, the filter tube 36 drives the elastic pawl 310 via the ratchet ring 37. The elastic pawl 310 drives the spiral blade 38 via the connecting rod 39. The scraper 311 on the spiral blade 38 moves accordingly. The spiral blade 38 transports the small crystal particles in the housing 1 to the collection trough 312. The scraper 311 pushes the small crystal particles in the collection trough 312 to the second discharge port 313 and discharges from the second discharge ramp 314. At the same time, the motor body 2 is started. The motor body 2 drives the transmission roller 22. The transmission roller 22 drives the filter screen 21. The large crystal particles on the filter screen 21 are intercepted by the first discharge ramp 26 and discharged from the first discharge port 25 along the first discharge ramp 26, thus realizing automatic discharge. Among them, the mounting bracket 11 is used to install the hollow shaft motor 33, the first guide bar 23 and the second guide bar 24 are used to guide the filter screen 21, and the drain valve is implemented using existing technology, so it is not shown in the figure.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-stage filtration separation device for purifying 2-bromo-4-nitroimidazole, comprising a housing (1), characterized in that: A vacuum pump (3) is fixedly connected to the housing (1). A suction pipe (31) is connected to the input end of the vacuum pump (3). A first connector (32) is connected to the input end of the suction pipe (31). A hollow shaft motor (33) is installed on the first connector (32). A hollow shaft body (34) is connected to the output end of the hollow shaft motor (33). A second connector (35) is connected to the bottom end of the hollow shaft body (34). A filter tube (36) is connected to the second connector (35). The filter tube (36) is hinged inside the housing (1). A ratchet ring (37) is fixedly connected to the filter tube (36). The ratchet ring (37) is connected to multiple elastic pawls (310), and the elastic pawls (310) are fixedly connected to the connecting rods (39). The housing (1) is fitted with a spiral blade (38), and the connecting rod (39) is fixedly connected to the spiral blade (38). The spiral blade (38) is fixedly connected to the scraper (311). The housing (1) is provided with a material collection trough (312), and the scraper (311) is slidably connected to the material collection trough (312). The material collection trough (312) is provided with a second discharge port (313), and the second discharge port (313) is fixedly connected to a second discharge inclined plate (314).

2. The multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole according to claim 1, characterized in that: The hollow shaft motor (33) is fixedly connected to a mounting bracket (11), and the mounting bracket (11) is fixedly connected inside the housing (1).

3. A multi-stage filtration separation device for purifying 2-bromo-4-nitroimidazole according to claim 1, characterized in that: The top of the material collection trough (312) is provided with a guide plate (12), and the guide plate (12) is fixedly connected to the shell (1).

4. A multi-stage filtration separation device for purifying 2-bromo-4-nitroimidazole according to claim 2, characterized in that: The mounting bracket (11) is provided with a filter screen (21) at the top. Two transmission rollers (22) are connected to the filter screen (21) and the transmission rollers (22) are rotatably connected to the housing (1). The housing (1) is fixedly connected with a motor body (2) and the output end of the motor body (2) is fixedly connected to one of the transmission rollers (22).

5. A multi-stage filtration separation device for purifying 2-bromo-4-nitroimidazole according to claim 4, characterized in that: The filter screen (21) is provided with a first guide strip (23) at the top and a second guide strip (24) is sleeved inside the filter screen (21). The first guide strip (23) and the second guide strip (24) are both fixedly connected inside the housing (1).

6. The multi-stage filtration and separation device for the purification of 2-bromo-4-nitroimidazole according to claim 5, characterized in that: The housing (1) is provided with a first discharge port (25) at the position corresponding to the filter screen (21). A first discharge inclined plate (26) is fixedly connected inside the first discharge port (25) and the first discharge inclined plate (26) is disposed on one side of the filter screen (21).

7. A multi-stage filtration separation device for purifying 2-bromo-4-nitroimidazole according to claim 6, characterized in that: A drain pipe (13) is fixedly connected to the lower surface of the housing (1) at the position corresponding to the filter pipe (36).

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