A closed filter for the production of o-chloro-p-nitroaniline and its usage method

Abstract

This invention provides a closed filter for the production of o-chloro-p-nitroaniline and its usage method. The closed filter includes: a sealed housing; a feed pipe connected to the top wall of the housing for conveying material from the crystallization reactor into the housing; an inclined sieve plate dividing the inner cavity of the housing and used to intercept large crystal particles in the material; a cleaning port located at the bottom of the side wall of the housing, directly opposite the bottom of the sieve plate, and used to clean the large crystal particles trapped in the housing when opened; and a discharge pipe connected to the bottom of the side wall of the housing, opposite to the bottom of the sieve plate, and used to remove material below the sieve plate. This invention can filter the material output from the crystallization reactor to separate large crystal particles; it also facilitates the collection and removal of large crystal particles; and during the filtration process, it allows for independent upward flushing and downward suction of each sieve hole, thereby improving the filtration efficiency and effect of the sieve plate, ultimately increasing the production efficiency and capacity of o-chloro-p-nitroaniline.

Description

Technical Field

[0001] This invention relates to a closed filter for the production of o-chloro-p-nitroaniline and its method of use. Background Technology

[0002] o-Chloro-p-nitroaniline is an organic compound with the chemical formula C6H5ClN2O2. It is mainly used as an intermediate for dyes and pigments, in the production of pigments such as Cinnabar R and disperse dyes such as GFL and B. It can also be used to produce pesticides for killing molluscs.

[0003] In the production of o-chloro-p-nitroaniline, the material output from the crystallization reactor needs to be filtered to separate large crystal particles. Existing filters often use a flat sieve plate with evenly distributed sieve holes to filter the material. When filtration is required, the material output from the crystallization reactor is conveyed to the top surface of the sieve plate. The material passes through the sieve plate, and the large crystal particles are intercepted on the top surface of the sieve plate. The material after the large crystal particles are filtered out falls below the sieve plate for further processing.

[0004] However, in actual production, the sieve holes of the sieve plate are easily blocked by large crystal particles, which will affect the passage of materials at the sieve plate, and ultimately affect the production efficiency and capacity of o-chloro-p-nitroaniline. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a closed filter for the production of o-chloro-p-nitroaniline, comprising: a closed housing; a feed pipe connected to the top wall of the housing for conveying materials output from the crystallization reactor into the housing; an inclined sieve plate with evenly distributed screen holes for intercepting large crystal particles in the material, divided into upper and lower internal cavities; a cleaning port located at the bottom of the side wall of the housing, opposite to the bottom of the sieve plate, sealed by a cover, and used to clean the large crystal particles trapped in the housing when opened; and a discharge pipe connected to the bottom of the side wall of the housing, opposite to the bottom of the sieve plate, and connected in series with a pump for removing material below the sieve plate.

[0006] The present invention also provides a method for using the above-mentioned sealed filter, comprising: a feed pipe conveying the material output from the crystallizer to the housing; the material passing through a sieve plate for filtration, large crystal particles in the material being intercepted on the top surface of the sieve plate, and the large crystal particles sliding down the sieve plate to the cleaning port; the material after the large crystal particles have been filtered out falling below the sieve plate, and the discharge pipe drawing away the material below the sieve plate for further processing; after the material filtration is completed, the cleaning port is opened to remove the large crystal particles.

[0007] For a more detailed description of the structure and usage of the sealed filter of this invention, please refer to the specific embodiments.

[0008] The advantages and beneficial effects of this invention are as follows: it provides a closed filter for the production of o-chloro-p-nitroaniline and its method of use; this invention can filter the material output from the crystallization reactor to separate large crystal particles; it can also facilitate the collection and removal of large crystal particles; and during the filtration process, it can independently perform upward flushing and downward suction on each sieve hole of the sieve plate, thereby improving the filtration efficiency and effect of the sieve plate, and ultimately improving the production efficiency and capacity of o-chloro-p-nitroaniline.

[0009] The present invention also has the following characteristics:

[0010] The present invention places the sieve plate at an angle, sets the feed pipe directly above the top of the sieve plate, and sets the cleaning port at the bottom of the sieve plate, which makes it easier to collect and remove large crystal particles.

[0011] This invention enables upward flushing and downward suction of the sieve holes during the filtration process. By flushing the sieve holes upward, large crystal particles that are blocking the top of the sieve holes are blown away from the sieve holes so that the material can enter the sieve holes. By suctioning the sieve holes downward, the material above the sieve holes is drawn into the sieve holes. This can improve the filtration efficiency and effect of the sieve plate.

[0012] This invention can also independently perform upward and downward thrusting on each screen hole of the screen plate. The upward thrusting force and downward thrusting force of a single screen hole can be adjusted according to the air pressure in the upper part of the inner cavity of the single screen hole. That is, the upward thrusting force and downward thrusting force of each screen hole can be adjusted independently, which can ensure that each screen hole can work effectively. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the sealed filter of the present invention;

[0014] Figure 2 This is a schematic diagram of a sieve plate. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0016] The specific technical solution of this invention is as follows:

[0017] like Figure 1 and Figure 2As shown, the present invention provides a closed filter for the production of o-chloro-p-nitroaniline, comprising: a closed housing 1; a feed pipe 2 connected to the top wall of the housing 1 for conveying the material output from the crystallization reactor into the housing 1; an inclined sieve plate 3 for intercepting large crystal particles in the material, which divides the inner cavity of the housing 1 vertically and vertically; a cleaning port 4 opened at the bottom of the side wall of the housing 1, facing the bottom of the sieve plate 3, sealed by a sealing cover, and used to clean the large crystal particles intercepted in the housing 1 when opened; and a discharge pipe 5 connected to the bottom of the side wall of the housing 1, opposite to the bottom of the sieve plate 3, and connected in series with a pump 51 for drawing away the material below the sieve plate 3.

[0018] The inclination angle of the sieve plate 3 (i.e., the angle between the sieve plate 3 and the horizontal plane) is 15 to 30 degrees; the feed pipe 2 is located directly above the top of the sieve plate 3.

[0019] The sieve plate 3 also includes: an upward punching unit 6 and a downward drawing unit 7 respectively configured in each sieve hole 31, and an air supply channel 81 located at the bottom of the sieve plate 3; the bottom surface of the sieve plate 3 is also externally connected to: an air supply pipe 82 communicating with the air supply channel 81.

[0020] The upward-flush unit 6 includes: a first spiral channel 61 extending vertically and sleeved around the lower half of the screen hole 31; a first nozzle 62 (located in the vertical middle of the screen hole 31) opened on the inner wall surface of the screen hole 31, communicating with the top of the first spiral channel 61 and obliquely upward; a first branch channel 63 connecting the bottom end of the first spiral channel 61 to the air supply channel 81; and a first micro flow regulating valve 64 and a first micro check valve 65 (the first micro check valve 65 only allows gas to flow from the first branch channel 63 to the first spiral channel 61) provided on the first branch channel 63.

[0021] The lower extraction unit 7 includes: a second spiral channel 71 extending vertically and sleeved around the upper half of the sieve hole 31; a second nozzle 72 (located in the vertical middle of the sieve hole 31) opened on the inner wall surface of the sieve hole 31, communicating with the bottom end of the second spiral channel 71 and arranged obliquely downward; a second branch channel 73 connecting the top end of the second spiral channel 71 with the gas supply channel 81; and a second micro flow regulating valve 74 and a second micro check valve 75 provided on the second branch channel 73 (the second micro check valve 75 only allows gas to flow along the second branch channel 73 to the second spiral channel 71).

[0022] Each sieve hole 31 is also embedded with a pressure sensor 9 located on the upper part of the sieve hole 31.

[0023] This invention also provides a method of using the above-mentioned sealed filter, including:

[0024] Feed pipe 2 transports the material output from the crystallizer to the housing 1; the material is filtered through sieve plate 3, and large crystal particles in the material are intercepted on the top surface of sieve plate 3, and the large crystal particles slide down sieve plate 3 to the cleaning port 4; the material after filtering out the large crystal particles falls below sieve plate 3, and discharge pipe 5 draws away the material below sieve plate 3 for further processing; after the material is filtered, the cleaning port 4 is opened to remove the large crystal particles;

[0025] During the material filtration process, the air supply pipe 82 supplies gas to each upward flushing unit 6 and each downward suction unit 7 through the air supply channel 81. The upward flushing unit 6 flushes the screen hole 31, and the downward suction unit 7 suctions the screen hole 31. Each screen hole 31 independently performs upward flushing and downward suction, and the upward flushing and downward suction of the same screen hole 31 are performed alternately.

[0026] When the screen hole 31 is subjected to upward thrust, the first micro one-way valve 65 is opened, and the air supply pipe 82 supplies gas to the first nozzle 62 through the air supply channel 81, the first branch channel 63, and the first spiral channel 61. The first nozzle 62 sprays gas obliquely upward in the screen hole 31. The gas sprayed by the first nozzle 62 thrusts upward in the screen hole 31, blowing away the large crystal particles blocked at the top of the screen hole 31 so that the material can enter the screen hole 31. When the first nozzle 62 sprays gas obliquely upward in the screen hole 31, the pressure sensor 9 detects the air pressure at the top of the screen hole 31. If the pressure sensor 9 detects that the air pressure remains increased for a first preset time, the first micro flow regulating valve 64 is controlled to increase the gas flow through the first branch channel 63, so that the first nozzle 62 sprays more airflow obliquely upward, thereby increasing the force of thrusting upward in the screen hole 31.

[0027] When the screen hole 31 is drawn downwards, the second micro check valve 75 is opened, and the air supply pipe 82 supplies gas to the second nozzle 72 through the air supply channel 81, the second branch channel 73, and the second spiral channel 71. The second nozzle 72 sprays gas obliquely downwards into the screen hole 31. The gas sprayed through the first nozzle 62 draws the material above the screen hole 31 into the screen hole 31. When the second nozzle 72 sprays gas obliquely downwards into the screen hole 31, the pressure sensor 9 detects the air pressure above the screen hole 31. If the pressure sensor 9 detects that the air pressure remains decreasing for a second preset time, the second micro flow regulating valve 74 is controlled to increase the gas flow through the second branch channel 73, so that the second nozzle 72 sprays more airflow obliquely downwards to increase the force of drawing the material downwards into the screen hole 31.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sealed filter for the production of o-chloro-p-nitroaniline, characterized in that, include: The enclosure includes a sealed box, an inlet pipe connected to the top wall of the box for conveying materials output from the crystallizer into the box, an upper and lower partitioned inner cavity with evenly distributed screen holes for intercepting large crystal particles in the material, an inclined screen plate located at the bottom of the side wall of the box, directly opposite the bottom of the screen plate, sealed with a cover, and a cleaning port for cleaning the large crystal particles trapped in the box when opened, and an outlet pipe connected to the bottom of the side wall of the box, opposite the bottom of the screen plate, connected in series with a pump for removing the material below the screen plate. The sieve plate also includes: an upward punching unit and a downward drawing unit configured for each sieve hole, as well as an air supply channel located at the bottom of the sieve plate; the bottom surface of the sieve plate is also externally connected to: an air supply pipe communicating with the air supply channel. The upward punching unit includes: a first spiral channel extending vertically and sleeved around the lower half of the screen hole; a first nozzle opened on the inner wall surface of the screen hole, communicating with the top of the first spiral channel and obliquely upward; a first branch channel connecting the bottom of the first spiral channel with the air supply channel; and a first micro flow regulating valve and a first micro check valve provided on the first branch channel. The lowering unit includes: a second spiral channel extending vertically and sleeved around the upper half of the sieve hole; a second nozzle opened on the inner wall surface of the sieve hole, connected to the bottom end of the second spiral channel, and obliquely downward; a second branch channel connecting the top end of the second spiral channel to the air supply channel; and a second micro flow regulating valve and a second micro check valve provided on the second branch channel. Each sieve hole has a pressure sensor embedded in its inner wall surface, located at the top of the sieve hole.

2. The sealed filter for the production of o-chloro-p-nitroaniline according to claim 1, characterized in that, The inclination angle of the sieve plate is 15 to 30 degrees.

3. The sealed filter for the production of o-chloro-p-nitroaniline according to claim 2, characterized in that, The feed pipe is located directly above the top of the sieve plate.

4. The method of using the sealed filter for the production of o-chloro-p-nitroaniline as described in claim 3, comprising: The feed pipe transports the material output from the crystallizer into the housing; the material is filtered through the sieve plate, and large crystal particles in the material are intercepted on the top surface of the sieve plate, and the large crystal particles slide down the sieve plate to the cleaning port; the material after the large crystal particles are filtered out falls below the sieve plate, and the discharge pipe draws away the material below the sieve plate; after the material filtration is completed, the cleaning port is opened to remove the large crystal particles.

5. The method of using the sealed filter for the production of o-chloro-p-nitroaniline according to claim 4, characterized in that, During the material filtration process, the air supply pipe supplies gas to each upward flushing unit and each downward suction unit through the air supply channel. The upward flushing unit flushes the screen holes, and the downward suction unit suctions the screen holes. Each screen hole independently performs upward flushing and downward suction, and the upward flushing and downward suction of the same screen hole are performed alternately. When the screen holes are flushed upwards, the first micro check valve is opened, and the air supply pipe supplies gas to the first nozzle through the air supply channel, the first branch channel, and the first spiral channel. The first nozzle sprays gas obliquely upwards into the screen holes. The gas sprayed through the first nozzle flushes the screen holes upwards, blowing away the large crystal particles that are blocking the top of the screen holes so that the material can enter the screen holes. When the screen holes are drawn downwards, the second micro check valve is opened, and the gas supply pipe supplies gas to the second nozzle through the gas supply channel, the second branch channel, and the second spiral channel. The second nozzle sprays gas obliquely downwards into the screen holes. The gas sprayed through the first nozzle draws the material above the screen holes into the screen holes.

6. The method of using the sealed filter for the production of o-chloro-p-nitroaniline according to claim 5, characterized in that, When the first nozzle sprays gas obliquely upward into the sieve hole, the pressure sensor detects the air pressure at the top of the sieve hole. If the pressure sensor detects that the air pressure remains increased for a first preset time, the first micro flow regulating valve is controlled to increase the gas flow through the first branch channel, so that the first nozzle sprays more airflow obliquely upward, thereby increasing the upward impact force on the sieve hole.

7. The method of using the sealed filter for the production of o-chloro-p-nitroaniline according to claim 5, characterized in that, When the second nozzle sprays gas obliquely downward in the sieve hole, the pressure sensor detects the air pressure at the top of the sieve hole. If the pressure sensor detects that the air pressure remains decreasing for a certain period of time, the second micro flow regulating valve is controlled to increase the gas flow through the second branch channel, so that the second nozzle sprays more airflow obliquely downward, thereby increasing the downward suction force on the sieve hole.

Images