Closed filter for producing o-chloro-p-nitroaniline and use method thereof

Abstract

The invention provides a closed filter for producing o-chloro-p-nitroaniline and a use method of the closed filter. The closed filter comprises a closed box body, a feeding pipe which is externally connected to the top wall of the box body and is used for conveying materials output by the crystallization kettle into the box body, and an inclined sieve plate which is used for vertically separating an inner cavity of the box body and is used for intercepting large crystal particles in the materials; the material cleaning opening is formed in the bottom of the side wall of the box body, right faces the bottom end of the sieve plate and is used for cleaning intercepted large crystal particles in the box body after being opened, and the discharging pipe is externally connected to the bottom of the side wall of the box body, is opposite to the bottom end of the sieve plate and is used for pumping away materials below the sieve plate. According to the invention, materials output by the crystallization kettle can be filtered so as to separate large crystallized particles; large crystal particles can be collected and taken out more conveniently; in the filtering process, each sieve hole of the sieve plate can be independently subjected to upward punching and downward drawing, so that the filtering efficiency and the filtering effect of the sieve plate are improved, and finally the production efficiency and the productivity of o-chloro-p-nitroaniline are improved.

Description

Technical Field

[0001] The invention relates to a closed filter for producing o-chloro-p-nitroaniline and a use method thereof. Background Art

[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. It is used in the production of pigment cinnabar R and disperse dyes red GFL, disperse red B, etc. It can also be used in the production of snail-killing pesticides.

[0003] In the production process of o-chloro-p-nitroaniline, the material output from the crystallization kettle needs to be filtered in order to separate large crystal particles. Existing filters often use a flat sieve plate with evenly distributed mesh holes to filter the material; when filtering is required, the material output from the crystallization kettle is transported to the top surface of the sieve plate, the material is filtered through the sieve plate, and the large crystal particles are intercepted on the top surface of the sieve plate. After filtering out the large crystal particles, the material falls below the sieve plate for further processing.

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

[0005] In order to solve the defects of the prior art, the present invention provides a closed filter for the production of o-chloro-p-nitroaniline, comprising: a closed box, a feed pipe externally connected to the top wall of the box and used for conveying the material output from the crystallization kettle to the box, an inclined sieve plate which divides the inner cavity of the box up and down, has sieve holes evenly distributed, and is used for intercepting large crystal particles in the material, a cleaning port which is opened at the bottom of the side wall of the box, faces the bottom end of the sieve plate, is closed by a sealing cover, and is used for cleaning the large crystal particles intercepted in the box after opening, and a discharge pipe which is externally connected to the bottom of the side wall of the box, faces the bottom end of the sieve plate, is connected in series with a suction pump, and is used for extracting the material under the sieve plate.

[0006] The present invention also provides a method for using the above-mentioned closed filter, including: a feed pipe conveys the output material of the crystallization kettle to a box body; the material is filtered through a sieve plate, 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 a cleaning port; the material after filtering out the large crystal particles falls below the sieve plate, and a discharge pipe draws away the material below the sieve plate so that the material can be further processed later; after the material filtering is completed, the cleaning port is opened to take out the large crystal particles.

[0007] For more specific structure and use method of the sealed filter of the present invention, please refer to the specific implementation method.

[0008] The advantages and beneficial effects of the present invention are as follows: providing a closed filter for the production of o-chloro-p-nitroaniline and a method for using the same; the present invention can filter the material output from the crystallization kettle so as to separate large crystalline particles; it can also be more conducive to the collection and removal of large crystalline particles; and in the filtering process, each sieve hole of the sieve plate can be independently punched up and pumped down, thereby improving the filtering efficiency and effect of the sieve plate, and finally improving the production efficiency and capacity of o-chloro-p-nitroaniline.

[0009] The present invention also has the following characteristics: The present invention places the sieve plate obliquely, arranges the feed pipe just above the top of the sieve plate, and arranges the cleaning port at the bottom of the sieve plate, which is more conducive to the collection and removal of large crystal particles; The present invention can perform upward punching and downward pumping on the sieve holes of the sieve plate during the filtering process; by performing upward punching on the sieve holes, large crystal particles blocking the top of the sieve holes are blown away from the sieve holes so that the materials can enter the sieve holes; by performing downward pumping on the sieve holes, the materials above the sieve holes are pumped into the sieve holes; thus, the filtering efficiency and effect of the sieve plate can be improved; The present invention can also independently implement upward punching and downward pumping on each sieve hole of the sieve plate, and can adjust the upward punching force and downward pumping force of the single sieve hole according to the upper air pressure of the inner cavity of the single sieve hole, that is, the upward punching force and downward pumping force of each sieve hole can be adjusted independently, thus ensuring that each sieve hole can work effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of a closed filter of the present invention; Figure 2 is a schematic diagram of the sieve plate. DETAILED DESCRIPTION

[0011] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0012] The technical solutions specifically implemented in the present invention are as follows: like Figure 1 and Figure 2 As shown, the present invention provides a closed filter for the production of o-chloro-p-nitroaniline, comprising: a closed box 1, a feed pipe 2 externally connected to the top wall of the box 1 and used to transport the output material of the crystallization kettle to the box 1, an inclined sieve plate 3 which divides the inner cavity of the box 1 up and down, has sieve holes 31 evenly distributed, and is used to intercept large crystal particles in the material, a cleaning port 4 which is opened at the bottom of the side wall of the box 1, faces the bottom end of the sieve plate 3, is closed by a sealing cover, and is used to clean the large crystal particles intercepted in the box 1 after opening, and a discharge pipe 5 externally connected to the bottom of the side wall of the box 1, faces the bottom end of the sieve plate 3, is connected in series with a suction pump 51, and is used to extract the material below the sieve plate 3; 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; The sieve plate 3 also has built-in upper punching units 6 and lower pumping units 7 respectively configured for each sieve hole 31, and an air supply channel 81 provided 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; The upper punch unit 6 includes: a first spiral channel 61 extending vertically and sleeved on the outer periphery of the lower half of the sieve hole 31, a first nozzle 62 opened on the inner wall surface of the sieve hole 31 and connected to the top of the first spiral channel 61 and arranged obliquely upward (the first nozzle 62 is located in the vertical middle of the sieve hole 31), a first branch channel 63 connecting the bottom end of the first spiral channel 61 with the air supply channel 81, and a first micro flow regulating valve 64 and a first micro check valve 65 arranged on the first branch channel 63 (the first micro check valve 65 only allows gas to flow along the first branch channel 63 to the first spiral channel 61); The lower pumping unit 7 comprises: a second spiral channel 71 extending vertically and sheathed on the outer periphery of the upper half of the sieve hole 31, a second nozzle 72 opened on the inner wall surface of the sieve hole 31 and connected to the bottom end of the second spiral channel 71 and arranged obliquely downward (the second nozzle 72 is located in the vertical middle of the sieve hole 31), a second branch channel 73 connecting the top end of the second spiral channel 71 with the air supply channel 81, and a second micro flow regulating valve 74 and a second micro check valve 75 arranged 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); The inner wall surface of each sieve hole 31 is also respectively embedded with: a pressure sensor 9 located at the upper part of the sieve hole 31; The present invention also provides a method for using the above-mentioned closed filter, comprising: The feed pipe 2 delivers the output material of the crystallization kettle to the box body 1; the material is filtered through the sieve plate 3, and the large crystal particles in the material are intercepted on the top surface of the sieve plate 3, and the large crystal particles slide down the sieve plate 3 to the cleaning port 4; the material after filtering out the large crystal particles falls below the sieve plate 3, and the discharge pipe 5 draws away the material below the sieve plate 3 so that the material can be further processed later; after the material is filtered, the cleaning port 4 is opened to take out the large crystal particles; During the material filtering process, the air supply pipe 82 supplies gas to each upper punching unit 6 and each lower pumping unit 7 through the air supply channel 81, the upper punching unit 6 performs upper punching on the sieve hole 31, and the lower pumping unit 7 performs lower pumping on the sieve hole 31, each sieve hole 31 performs upper punching and lower pumping independently, and the upper punching and lower pumping of the same sieve hole 31 are performed alternately; When the sieve hole 31 is subjected to upward punching, 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, and the first nozzle 62 sprays gas obliquely upward in the sieve hole 31; the gas sprayed through the first nozzle 62 is subjected to upward punching on the sieve hole 31, and the large crystal particles blocked at the top of the sieve hole 31 are blown away from the sieve hole 31, so that the material can enter the sieve hole 31; and when the first nozzle 62 sprays gas obliquely upward in the sieve hole 31, the air pressure at the top of the sieve hole 31 is detected by the pressure sensor 9. If the pressure sensor 9 detects that the time for which the air pressure remains increased reaches a first preset time, the first micro flow regulating valve 64 is controlled to increase the gas flow rate flowing through the first branch channel 63, so that the first nozzle 62 sprays more airflow obliquely upward, so as to increase the force of the upward punching on the sieve hole 31; When the sieve hole 31 is pumped downward, the second micro-one-way 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, and the second nozzle 72 sprays gas obliquely downward in the sieve hole 31; the gas sprayed through the first nozzle 62 pumps the sieve hole 31 downward, and the material above the sieve hole 31 is drawn into the sieve hole 31; and when the second nozzle 72 sprays gas obliquely downward in the sieve hole 31, the air pressure on the upper part of the sieve hole 31 is detected by the pressure sensor 9. If the pressure sensor 9 detects that the time for which the air pressure remains reduced reaches a second preset time, the second micro-flow regulating valve 74 is controlled to increase the gas flow rate flowing through the second branch channel 73, so that the second nozzle 72 sprays more airflow obliquely downward, so as to increase the force of pumping downward on the sieve hole 31.

[0013] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A closed filter for the production of o-chloro-p-nitroaniline, characterized in that: include: A closed box body, a feed pipe connected to the top wall of the box body and used for conveying the output material of the crystallization kettle to the box body, an inclined sieve plate which divides the inner cavity of the box body up and down, has sieve holes evenly distributed, and is used to intercept large crystal particles in the material, a cleaning port which is opened at the bottom of the side wall of the box body, faces the bottom end of the sieve plate, is closed by a sealing cover, and is used to clean the large crystal particles intercepted in the box body after opening, and a discharge pipe which is connected to the bottom of the side wall of the box body, faces the bottom end of the sieve plate, is connected in series with a suction pump, and is used to extract the material under the sieve plate.

2. The closed filter for producing 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 closed filter for producing o-chloro-p-nitroaniline according to claim 2, characterized in that: The feed pipe is located just above the top of the sieve plate.

4. The closed filter for producing o-chloro-p-nitroaniline according to claim 3, characterized in that: The sieve plate is also built with: an upper punch unit respectively configured for each sieve hole, and an air supply channel arranged at the bottom of the sieve plate; the bottom surface of the sieve plate is also externally connected with: an air supply pipe connected to the air supply channel; The upper punch unit includes: a first spiral channel extending vertically and sleeved on the outer periphery of the lower half of the sieve hole, a first nozzle opened on the inner wall surface of the sieve hole, connected to the top of the first spiral channel and arranged obliquely upward, a first branch channel connecting the bottom end of the first spiral channel with the air supply channel, and a first micro flow regulating valve and a first micro check valve arranged on the first branch channel.

5. The closed filter for producing o-chloro-p-nitroaniline according to claim 4, characterized in that: The sieve plate also has built-in: a lower draw unit respectively configured for each sieve hole; The downward pumping unit includes: a second spiral channel extending vertically and sleeved on the outer periphery of 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 arranged obliquely downward, a second branch channel connecting the top end of the second spiral channel with the air supply channel, and a second micro flow regulating valve and a second micro check valve arranged on the second branch channel.

6. The closed filter for producing o-chloro-p-nitroaniline according to claim 5, characterized in that: The inner wall surface of each sieve hole is also respectively embedded with: a pressure sensor located at the upper part of the sieve hole.

7. The method for using the closed filter for producing o-chloro-p-nitroaniline according to claim 6, comprising: The feed pipe conveys the output material of the crystallization kettle to the box; the material is filtered through the sieve plate, and the 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 filtering out the large crystal particles falls below the sieve plate, and the discharge pipe draws away the material below the sieve plate; after the material is filtered, the cleaning port is opened to take out the large crystal particles.

8. The method for using the closed filter for producing o-chloro-p-nitroaniline according to claim 7, characterized in that: During the material filtering process, the air supply pipe supplies gas to each upper punching unit and each lower pumping unit through the air supply channel. The upper punching unit performs upper punching on the sieve hole, and the lower pumping unit performs lower pumping on the sieve hole. Each sieve hole performs upper punching and lower pumping independently, and the upper punching and lower pumping of the same sieve hole are performed alternately. When the sieve hole is subjected to upward punching, the first micro one-way valve is opened, and the gas supply pipe supplies gas to the first nozzle through the gas supply channel, the first branch channel, and the first spiral channel, and the first nozzle sprays gas obliquely upward in the sieve hole; the gas sprayed through the first nozzle is subjected to upward punching on the sieve hole, and the large crystal particles blocking the top of the sieve hole are blown away from the sieve hole, so that the material can enter the sieve hole; When the sieve hole is pumped downward, the second micro one-way valve is opened, and the air supply pipe supplies gas to the second nozzle through the air supply channel, the second branch channel, and the second spiral channel. The second nozzle sprays gas obliquely downward in the sieve hole; the gas sprayed through the first nozzle pumps the sieve hole downward, and the material above the sieve hole is drawn into the sieve hole.

9. The method for using the closed filter for producing o-chloro-p-nitroaniline according to claim 8, characterized in that: When the first nozzle sprays gas obliquely upward in the sieve hole, the air pressure above the sieve hole is detected by the pressure sensor. 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, so as to increase the force of the upward impact on the sieve hole.

10. The method for using the closed filter for producing o-chloro-p-nitroaniline according to claim 8, characterized in that: When the second nozzle sprays gas obliquely downward in the sieve hole, the air pressure above the sieve hole is detected by the pressure sensor. If the pressure sensor detects that the air pressure remains reduced for a second preset time period, 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, so as to increase the force of pumping down the sieve hole.

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