Efficient circulating filtration continuous nitration reactor

Abstract

The utility model discloses an efficient circulating filtration continuous nitration reactor, which comprises a shell, a collecting tank and a liquid supply pump, a filter element is arranged in the shell, the upper surface of the shell is connected with a continuous tubular reactor through a discharge flange pipe, a sealing cover is arranged at the upper end of the collecting tank, a filter plate is arranged in the collecting tank, the collecting tank is connected with a valve, and the valve is connected with the liquid supply pump. The liquid supply pump is installed on the surface of the sealing cover, a liquid inlet of the liquid supply pump is communicated with the sealing cover, and a liquid outlet of the liquid supply pump is communicated with a backflow pipe of the shell through a one-way valve. After raw materials enter the shell, impurities in the raw materials penetrating through the filter screen are filtered out, the impurities are accumulated below the shell, the valve is opened to feed the impurities and part of the raw materials into the collecting tank, the filter plate intercepts the impurities, the pure raw materials are located above the filter plate, the liquid supply pump extracts the pure raw materials and conveys the pure raw materials to the shell, and circulating filtration and recycling of the raw materials can be achieved. And raw material waste and impurity treatment pressure are reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to a high-efficiency circulating filtration continuous nitration reactor. Background Technology

[0002] In the continuous nitration process of 2-methyl-5-nitroimidazole, the raw materials and reaction solution may contain solid particles, dust, or other insoluble impurities. These impurities may affect the reaction, reduce product purity and yield, and even damage the equipment. Therefore, using a filter can effectively remove these impurities, ensuring the smooth progress of the reaction and the quality of the product.

[0003] In related technologies, commonly used filters intercept impurities in raw materials and reaction solutions. However, during the cleaning of impurities, some raw materials and reaction solutions are discharged along with them, resulting in waste of some raw materials and reaction solutions. The presence of raw materials and reaction solutions affects the efficiency of impurity treatment. If the treatment is incomplete, the raw materials and reaction solutions will also pollute the environment. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency circulating filtration continuous nitration reactor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency circulating filtration continuous nitrification reactor, comprising a shell, wherein a filter element is installed in the shell, and the upper surface of the shell is connected to a continuous tubular reactor through a discharge flange pipe;

[0006] The collection tank is equipped with a cover at the top and a filter plate inside. The collection tank is connected to a valve, which is in communication with the outer shell. Impurities and some raw materials discharged from the outer shell enter the collection tank. The filter plate can block impurities, making it easier to recover raw materials from the collection tank and reducing raw material waste.

[0007] A liquid supply pump is installed on the surface of the cover, and the inlet of the liquid supply pump is connected to the cover. The outlet of the liquid supply pump is connected to the return pipe of the outer shell through a one-way valve. The liquid supply pump sends the raw materials from the collection tank into the outer shell, which can realize the recycling of raw materials.

[0008] Furthermore, a feed flange pipe is installed on the lower part of the outer shell surface, through which raw materials are fed into the outer shell. A drain pipe is provided on the lower surface of the outer shell, through which impurities in the outer shell are sent into the collection tank. The drain pipe is connected to a valve, which can be opened to discharge impurities. The lower surface of the collection tank is provided with a discharge port, and the upper surface of the cover is provided with an overflow pipe. A ball valve is installed on the cover, and the ball valve is connected to the overflow pipe. The ball valve is used to control the overflow flow, and the overflow pipe can guide the overflow to the treatment point to prevent raw materials from leaking into the vicinity of the collection tank.

[0009] Furthermore, the cap is equipped with a suction tube inside, with the suction port of the suction tube facing upwards. The suction tube is connected to the inlet of the liquid supply pump, which can prevent the liquid supply pump from drawing out impurities, resulting in a purer recovery process.

[0010] Furthermore, both the outer shell and the collection tank are equipped with positioning components. Two positioning components are used to fix the filter element and the filter plate. The positioning components include a support ring and a pressure ring. The filter element and the filter plate are placed between the corresponding support ring and pressure ring, which improves the stability and sealing of the filter element and the filter plate installation, so that the filter element and the filter plate can effectively intercept impurities.

[0011] Furthermore, the filter element includes an outer shell and an inner shell, and a filter screen is provided between the outer shell and the inner shell. The outer shell and the inner shell can prevent the filter screen from deforming and ensure that the filter screen is not damaged.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) After the raw material enters the shell, the raw material passing through the filter screen is filtered to remove impurities. The impurities accumulate at the bottom of the shell. The valve is opened to send the impurities and some raw materials into the collection tank. The filter plate intercepts the impurities, and the pure raw material is located above the filter plate. The liquid supply pump draws out the pure raw material and delivers it to the shell. This can realize the circulation filtration and recycling of raw materials, reduce raw material waste and impurity treatment pressure.

[0014] (2) The suction port of the suction pipe is arranged upward to ensure that the suction force of the liquid supply pump will not be directly directed towards the filter plate, thus preventing impurities from being sucked into the liquid supply pump. Valves and check valves can prevent impurities in the casing from flowing into the collection tank. The raw materials in the collection tank are discharged through the overflow pipe and diverted to the treatment point to prevent the raw materials from leaking freely. Attached Figure Description

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

[0016] Figure 2 This is a schematic diagram of the internal structure of the collection tank of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the outer shell of this utility model;

[0018] Figure 4 This is a cross-sectional view of the filter element of this utility model.

[0019] In the diagram: 1. Outer shell; 2. Inlet flange; 3. Outlet flange; 4. Drain pipe; 5. Valve; 6. Collection tank; 7. Cover; 8. Liquid supply pump; 9. Check valve; 10. Return pipe; 11. Ball valve; 12. Overflow pipe; 13. Filter plate; 14. Suction pipe; 15. Support ring; 16. Pressure ring; 17. Outer shell; 18. Inner shell; 19. Filter screen; 20. Discharge port. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example:

[0022] Please see Figure 1-4 This utility model provides a technical solution: a high-efficiency circulating filtration continuous nitration reactor, including a shell 1, in which a filter element is installed. The upper surface of the shell 1 is connected to a continuous tubular reactor through a discharge flange pipe 3. The shell 1 is made of 316L stainless steel. The outer diameter of the filter element is smaller than the inner diameter of the shell 1, so that the raw material has flow space and the raw material passing through the filter element is purer and free of impurities.

[0023] Collection tank 6, with a cover 7 installed at the upper end of the collection tank 6, and the cover 7 and collection tank 6 are connected by bolts and nuts. A filter plate 13 is installed in the collection tank 6. The collection tank 6 is connected to a valve 5, and the valve 5 is connected to the outer shell 1. The filter plate 13 can intercept impurities, and the raw material passing through the filter plate 13 is recycled into the outer shell 1.

[0024] The liquid supply pump 8 is installed on the surface of the cover 7, and the inlet of the liquid supply pump 8 is connected to the cover 7. The outlet of the liquid supply pump 8 is connected to the return pipe 10 of the outer shell 1 through the one-way valve 9. The one-way valve 9 can prevent the raw materials in the outer shell 1 from flowing into the collection tank 6 through the return pipe 10, thus avoiding backflow problems.

[0025] In this embodiment, as Figure 1 As shown, a feed flange pipe 2 is installed on the lower part of the outer shell 1, and a drain pipe 4 is provided on the lower surface of the outer shell 1. The drain pipe 4 is connected to a valve 5. By opening the valve 5, impurities can be periodically discharged into the collection tank 6. Both the upper and lower ends of the outer shell 1 are equipped with baffles. Bolts and nuts are used to connect the baffles to the outer shell 1. The discharge flange pipe 3 is connected to the upper baffle, and the drain pipe 4 is connected to the lower baffle.

[0026] In this embodiment, as Figure 1 As shown, the lower surface of the collection tank 6 is provided with a discharge port 20. The discharge port 20 is connected to the processing point for processing impurities through a pipe and a shut-off valve. Opening the shut-off valve sends the impurities in the collection tank 6 into the processing point. The upper surface of the cover 7 is provided with an overflow pipe 12. A ball valve 11 is installed on the cover 7. The ball valve 11 is connected to the overflow pipe 12. The overflow speed is controlled by the opening degree of the ball valve 11. The overflow pipe 12 extends to the processing point, which can prevent raw materials from leaking to undesignated locations.

[0027] In this embodiment, as Figure 2 As shown, the cover 7 is provided with a suction pipe 14 inside. The suction port of the suction pipe 14 is arranged upward. The suction pipe 14 is connected to the inlet of the liquid supply pump 8. When there are some impurities below the filter plate 13, the upward arrangement of the suction port can prevent the impurities from passing through the filter plate 13 due to the suction of the liquid supply pump 8, and the recovered raw material has a low impurity content.

[0028] In this embodiment, as Figure 2 and Figure 3 As shown, both the outer shell 1 and the collection tank 6 are provided with positioning components. The two positioning components are used to fix the filter element and the filter plate 13. The positioning components include a support ring 15 and a pressure ring 16. The filter element and the filter plate 13 are placed between the corresponding support ring 15 and pressure ring 16. The support ring 15 in the collection tank 6 is connected to the collection tank 6, and the pressure ring 16 in the collection tank 6 is connected to the cover 7. The support ring 15 in the outer shell 1 is connected to the outer shell 1, and the pressure ring 16 in the outer shell 1 is connected to the baffle, so as to achieve the sealed installation of fixing the filter element and the filter plate 13.

[0029] In this embodiment, as Figure 4 As shown, the filter element includes an outer shell 17 and an inner shell 18, and a filter screen 19 is provided between the outer shell 17 and the inner shell 18. The outer shell 17 and the inner shell 18 can prevent the filter screen 19 from deforming due to pressure, ensuring that the filter screen 19 is not easily damaged. The filter screen 19 can be made of polytetrafluoroethylene or polypropylene, and the filter plate 13 is made of 316L, which is more durable.

[0030] Specifically, during use, the raw material enters the outer shell 1 through the feed flange pipe 2. When the pressure of the raw material in the outer shell 1 increases, the raw material passes through the filter screen 19, and impurities are filtered by the filter screen 19. The filtered raw material flows from the discharge flange pipe 3 to the continuous tubular reactor.

[0031] When a certain amount of impurities accumulate in the outer shell 1, open valve 5 to send the impurities and some raw materials into collection tank 6. In practical applications, collection tank 6 can be installed below the outer shell 1, and impurities can be sent into collection tank 6 by natural flow. In collection tank 6, impurities and raw materials are stored for a period of time, causing the impurities to settle to the bottom of collection tank 6. Filter plate 13 can intercept impurities, ensuring that the raw materials above filter plate 13 are purer.

[0032] The liquid supply pump 8, in conjunction with the suction pipe 14, extracts the raw material above the filter plate 13. The raw material flows into the outer shell 1 for recycling through the one-way valve 9 and the return pipe 10, reducing the waste of raw material. The discharge port 20 is connected to the pipe and the shut-off valve. Opening the shut-off valve discharges impurities from the collection tank 6.

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

Claims

1. A high-efficiency circulating filtration continuous nitrification reactor, characterized in that, The utility model relates to a filter device for continuous tube reactor, comprising: a housing (1) in which a filter core is installed, the upper surface of the housing (1) is connected with a continuous tube reactor through a discharge flange pipe (3); a collecting tank (6) in which a filter plate (13) is installed, the upper end of the collecting tank (6) is provided with a cover (7), the collecting tank (6) is connected with a valve (5), and the valve (5) is communicated with the housing (1); a liquid supply pump (8) is installed on the surface of the cover (7), the liquid inlet of the liquid supply pump (8) is communicated with the cover (7), and the liquid outlet of the liquid supply pump (8) is communicated with the return pipe (10) of the housing (1) through a check valve (9).

2. A high efficiency recirculating filter continuous nitration reactor according to claim 1, characterized in that: The lower part of the surface of the housing (1) is provided with a feed flange pipe (2), and the lower surface of the housing (1) is provided with a blowdown pipe (4) connected with the valve (5).

3. A high efficiency recirculating filter continuous nitration reactor according to claim 1, characterized in that: The lower surface of the collecting tank (6) is provided with a discharge port (20), and the upper surface of the cover (7) is provided with an overflow pipe (12).

4. A high efficiency recirculating filter continuous nitration reactor according to claim 3, characterized in that: A ball valve (11) is installed on the cover (7) and connected with the overflow pipe (12).

5. A high efficiency recirculating filter continuous nitration reactor according to claim 1, characterized in that: The cover (7) is internally provided with a suction pipe (14), the suction port of the suction pipe (14) is arranged upward, and the suction pipe (14) is connected with the liquid inlet of the liquid supply pump (8).

6. A high efficiency recirculating filter continuous nitration reactor according to claim 1, characterized in that: The housing (1) and the collecting tank (6) are both provided with positioning members, and the two positioning members are used for fixing the filter core and the filter plate (13).

7. A high efficiency recirculating filter continuous nitration reactor according to claim 6, characterized in that: The positioning members comprise a support ring (15) and a pressing ring (16), and the filter core and the filter plate (13) are arranged between the corresponding support ring (15) and the pressing ring (16).

8. A high efficiency recirculating filter continuous nitration reactor according to claim 1, characterized in that: The filter core comprises an outer cylinder shell (17) and an inner cylinder shell (18), and a filter screen (19) is arranged between the outer cylinder shell (17) and the inner cylinder shell (18).

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