Tubular nitrator for preparing 2, 4-dichloro-3-fluoronitrobenzene

Abstract

The utility model relates to a tubular nitrator for preparing 2, 4-dichloro-3-fluoronitrobenzene, which comprises a rectangular lifting frame and a ground, a tubular nitration reactor is arranged in the lifting frame, a rectangular heat dissipation pool is formed on the ground, the lifting frame is inserted in the heat dissipation pool on the ground, and the nitration reactor is immersed in water in the heat dissipation pool; the upper end of the lifting frame is fixedly connected to a horizontal rectangular supporting plate, and the supporting plate abuts against the ground around the heat dissipation pool. Longitudinal lifting grooves are formed in the positions, on the two sides of the heat dissipation pool, of the ground, vertical positioning sleeves are fixedly inserted into the front sides and the rear sides of the lifting grooves correspondingly, lifting columns are inserted into the positioning sleeves, and the upper ends of the lifting columns stretch out of the positioning sleeves to be fixedly connected to the lower end face of the supporting plate. The tubular nitrator is connected with the lifting structure of a rope pulley structure, and the tubular nitrator can be lifted and moved out of the heat dissipation pool based on the lifting structure, so that water does not need to be drained and enters the water pool, and the maintenance operation of the nitration reactor is facilitated.

Description

Technical field:

[0001] The utility model relates to the technical field of tubular nitrators, and more specifically to a tubular nitrator for preparing 2,4-dichloro-3-fluoronitrobenzene. Background technology:

[0002] 2,6-dichlorofluorobenzene, with a molecular formula of C6H3Cl2F, is used as an intermediate for medicines, pesticides and dyes, and is a raw material for preparing 2,4-dichloro-3-fluoronitrobenzene. At present, in the process of preparing 2,4-dichloro-3-fluoronitrobenzene from 2,6-dichlorofluorobenzene, a nitration reaction will be carried out; the nitration reaction is carried out in a nitration reactor, and the existing nitration reactors are various. For the process of preparing 2,4-dichloro-3-fluoronitrobenzene, the nitrated products need to be mixed evenly in the nitration reaction, and the reaction is required to be fully and thoroughly to effectively improve the utilization rate of nitric acid. Therefore, a tubular reactor with multiple vertical pipe structure reaction vessels is selected (a mixer is provided at the inlet of the reaction vessel, which can achieve uniform mixing of the nitrated products entering the reaction vessel, and has sufficient reaction space to achieve full reaction);

[0003] However, when the nitrification reaction is fully and thoroughly carried out in the tubular nitrifier, a large amount of heat will be released. In order to achieve heat dissipation of the nitrification reactor, the nitrification reactor is installed in a rectangular frame-shaped bracket, and the bracket is set in a heat sink filled with water. The water in the heat sink is connected to the cooling tower through a pipeline, and then the heat sink is used to achieve heat dissipation of the nitrification reactor; but when the nitrification reactor is inspected and repaired, it is necessary to drain the water in the heat sink and enter the heat sink to inspect and repair the nitrification reactor, which is rather troublesome; therefore, optimization and rectification are needed to facilitate the inspection and maintenance work. Utility model content:

[0004] The purpose of the utility model is to address the deficiencies of the prior art and to provide a tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene. The tubular nitrifier is connected to a lifting structure with a rope pulley structure. Based on the lifting structure, the tubular nitrifier can be lifted and moved out of the heat sink, thereby facilitating the maintenance of the nitrification reactor.

[0005] A tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene comprises a rectangular lifting frame and a ground, a tubular nitrification reactor is installed in the lifting frame, a rectangular heat sink is formed on the ground, the lifting frame is inserted in the heat sink on the ground, and the nitrification reactor is immersed in the water of the heat sink; the upper end of the lifting frame is fixedly connected to a horizontal rectangular support plate, and the support plate is against the ground around the heat sink; longitudinal lifting grooves are formed on the ground on both sides of the heat sink, and vertical positioning sleeves are respectively inserted and fixed on the front and rear sides of the lifting grooves, and lifting columns are inserted in the positioning sleeves, and the upper ends of the lifting columns extend out of the positioning sleeves and are fixed to the lower end surface of the support plate;

[0006] Vertical guide grooves are formed on the opposite end faces of the positioning sleeves in the lifting grooves, and a longitudinal lifting shaft is inserted in the lifting grooves between the positioning sleeves. The two ends of the lifting shaft pass through the guide grooves of the positioning sleeves and are fixedly connected to the outer wall of the lower end of the lifting column; a plurality of movable pulleys are pivotally connected to the lifting shaft, and a fixed pulley is arranged at the upper end of the lifting groove. Steel wire ropes are wound around the fixed pulleys and the movable pulleys, and one end of the steel wire rope is fixedly connected to a positioning steel plate, and the positioning steel plate is fixed on the upper end face of the ground; the other end of the steel wire rope is connected to a winding mechanism.

[0007] Preferably, the nitration reactor comprises two rows of vertical reaction tubes, the lower ends of the reaction tubes are fixedly connected with longitudinal input tubes, the rear ends of the input tubes are fixedly connected with vertical main inlet tubes, the main inlet tubes are plugged and fixed on the support plate, a plurality of pads are fixedly connected to the input tubes, and the pads are fixed to the bottom of the lifting frame; the upper ends of the reaction tubes are fixedly connected with a plurality of output tubes, the upper ends of the output tubes pass through the support plate and are fixedly connected with the main outlet tubes; the side walls of the lifting frame are fixedly connected with auxiliary brackets, and the auxiliary brackets are fixedly connected to the outer walls of the reaction tubes.

[0008] Preferably, rectangular notches are formed on both sides of the support plate, and the winding mechanism and the positioning steel plate are both located in the notches of the support plate.

[0009] Preferably, the upper end surface of the positioning steel plate is flush with the upper end surface of the supporting plate.

[0010] Preferably, the winding mechanism includes front and rear supporting end plates that are opposite to each other and fixed to the ground, a longitudinal winding shaft is hinged between the supporting end plates, both ends of the winding shaft are connected to the supporting end plates through bearings, one end of the winding shaft extends out and is fixed with a handwheel; the wire rope is wound around the winding shaft.

[0011] Preferably, the movable pulleys are provided with two groups and the fixed pulleys are provided with one group, and the fixed pulleys are located between the movable pulleys; the movable pulleys are arranged longitudinally, and the fixed pulleys are arranged transversely, and the fixed pulleys include a wheel body and a core shaft, and the core shaft is inserted in the wheel body; vertical grooves are formed on the two side walls at the upper end of the lifting groove, and the two ends of the core shaft on the fixed pulley are respectively inserted in the grooves on the ground.

[0012] The beneficial effects of the utility model are:

[0013] The tubular nitrifier is connected to a lifting structure with a rope pulley structure. Based on the lifting structure, the tubular nitrifier can be lifted and moved out of the heat dissipation pool, thereby eliminating the need to drain water and enter the pool, thereby facilitating the maintenance of the nitrification reactor. Description of the drawings:

[0014] Figure 1 It is a schematic cross-sectional structure diagram of the utility model in the front view direction;

[0015] Figure 2It is a schematic diagram of the cross-sectional structure of the utility model in the side view direction.

[0016] In the figure: 1. lifting frame; 2. ground; 21. heat sink; 22. lifting slot; 23. groove; 3. support plate; 31. notch; 4. positioning sleeve; 41. guide slot; 5. lifting column; 6. lifting shaft; 7. movable pulley; 8. wire rope; 9. winding mechanism; 91. winding shaft; 92. supporting end plate; 93. hand wheel; 10. fixed pulley; 11. positioning steel plate; 12. nitrification reactor. Specific implementation method:

[0017] Example: See Figure 1 , 2 As shown, a tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene comprises a rectangular lifting frame 1 and a ground 2, wherein a tubular nitrification reactor 12 is installed in the lifting frame 1, and a rectangular heat sink 21 is formed on the ground 2, wherein a water inlet pipe and a water outlet pipe are inserted in the heat sink 21, and the ends of the water inlet pipe and the water outlet pipe are respectively connected to cooling towers; the lifting frame 1 is inserted in the heat sink 21 of the ground 2, and the nitrification reactor 12 is immersed in the water of the heat sink 21; the upper end of the lifting frame 1 is fixedly connected to a horizontal rectangular support plate 3, and the support plate 3 is against the ground 2 around the heat sink 21; longitudinal lifting grooves 22 are formed on the ground 2 on both sides of the heat sink 21, and vertical positioning sleeves 4 are respectively inserted and fixed on the front and rear sides of the lifting grooves 22, and a lifting column 5 is inserted in the positioning sleeve 4, and the upper end of the lifting column 5 extends out of the positioning sleeve 4 and is fixed to the lower end surface of the support plate 3;

[0018] A vertical guide groove 41 is formed on the opposite end surface of the positioning sleeve 4 in the lifting groove 22, and a longitudinal lifting shaft 6 is inserted in the lifting groove 22 between the positioning sleeves 4. The two ends of the lifting shaft 6 pass through the guide groove 41 of the positioning sleeve 4 and are fixedly connected to the outer wall of the lower end of the lifting column 5; a plurality of movable pulleys 7 are pivotally connected to the lifting shaft 6, and a fixed pulley 10 is arranged at the upper end of the lifting groove 22. Steel wire rope 8 is wound around the fixed pulley 10 and the movable pulley 7. One end of the steel wire rope 8 is fixedly connected to a positioning steel plate 11, and the positioning steel plate 11 is fixed to the upper end surface of the ground 2; the other end of the steel wire rope 8 is connected to the winding mechanism 9; the fixed pulley 10 and the movable pulley 7 are arranged to save effort when winding the steel wire rope 8.

[0019] The nitration reactor 12 comprises two rows of vertical reaction tubes 121, the lower ends of the reaction tubes 121 are fixedly connected with longitudinal input tubes 122, the rear ends of the input tubes 122 are fixedly connected with vertical main inlet tubes 123, the main inlet tubes 123 are plugged and fixed on the support plate 3, a plurality of pads are fixedly connected to the input tubes 122, and the pads are fixed to the bottom of the lifting frame 1; a plurality of output tubes 124 are fixedly connected to the upper ends of the reaction tubes 121, and the upper ends of the output tubes 124 pass through the support plate 3 and are fixedly connected with main outlet tubes 125; an auxiliary bracket 126 is fixedly connected to the side wall of the lifting frame 1, and the auxiliary bracket 126 is fixedly connected to the outer wall of the reaction tube 121; the lifting frame 1 comprises a rectangular beam frame, the two side edges and four corners of which are fixedly connected with a plurality of columns, a plurality of supporting beams are fixedly connected in the beam frame, and the pads are arranged on the supporting beams.

[0020] Rectangular notches 31 are formed on both sides of the support plate 3 , and the winding mechanism 9 and the positioning steel plate 11 are both located in the notches 31 of the support plate 3 .

[0021] The upper end surface of the positioning steel plate 11 is flush with the upper end surface of the supporting plate 3 .

[0022] The winding mechanism 9 includes front and rear supporting end plates 92 that are opposite to each other and fixed to the ground 2, a longitudinal winding shaft 91 is hinged between the supporting end plates 92, both ends of the winding shaft 91 are connected to the supporting end plates 92 through bearings, and one end of the winding shaft 91 extends out and is fixedly connected with a hand wheel 93; the wire rope 8 is wound around the winding shaft 91, and the winding shaft 91 can be driven to wind up the wire rope 8 by rotating the hand wheel 93.

[0023] The movable pulleys 7 are provided with two groups, and the fixed pulleys 10 are provided with one group, and the fixed pulleys 10 are located between the movable pulleys 7; the movable pulleys 7 are arranged longitudinally, and the fixed pulleys 10 are arranged transversely, and the fixed pulleys 10 include a wheel body and a core shaft, and the core shaft is inserted in the wheel body; vertical grooves 23 are formed on the two side walls at the upper end of the lifting groove 22, and the two ends of the core shaft on the fixed pulley 10 are respectively inserted in the grooves 23 of the ground 2.

[0024] Working principle: The utility model is a tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene, wherein the nitrification reactor 12 is installed in a lifting frame 1, and the lifting frame 1 is fixed on a support plate 3, and the nitrification reactor 12 is suspended in the heat sink 21 through the support plate 3;

[0025] When maintenance is required, the wire rope 8 is wound up by using the winding mechanism 9 on both sides of the support plate 3 to drive the lifting shaft 6 to move upward. The lifting shaft 6 can lift the lifting column 5, and then the lifting column 5 realizes the upward movement of the support plate 3, the lifting frame 1 and the nitrification reactor 12; when the nitrification reactor 12 is moved out of the heat dissipation pool 21, an external beam plate is inserted between the lifting frame 1 and the ground 2, and the nitrification reactor 12 is set on the upper side of the ground 2 based on the beam plate, thereby facilitating the maintenance of the nitrification reactor 12.

[0026] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene, comprising a rectangular lifting frame (1) and a ground (2), wherein a tubular nitrification reactor (12) is installed in the lifting frame (1), a rectangular heat sink (21) is formed on the ground (2), the lifting frame (1) is inserted into the heat sink (21) on the ground (2), and the nitrification reactor (12) is immersed in the water of the heat sink (21); the upper end of the lifting frame (1) is fixedly connected to a horizontal rectangular support plate (3), and the support plate (3) is against the ground (2) around the heat sink (21); characterized in that: Longitudinal lifting grooves (22) are formed on the ground (2) on both sides of the heat sink (21), and vertical positioning sleeves (4) are respectively inserted and fixed on the front and rear sides of the lifting grooves (22), and a lifting column (5) is inserted in the positioning sleeve (4), and the upper end of the lifting column (5) extends out of the positioning sleeve (4) and is fixed to the lower end surface of the support plate (3); A vertical guide groove (41) is formed on the end surface opposite to the positioning sleeve (4) in the lifting groove (22); a longitudinal lifting shaft (6) is inserted in the lifting groove (22) between the positioning sleeves (4); the two ends of the lifting shaft (6) respectively pass through the guide groove (41) of the positioning sleeve (4) and are fixedly connected to the outer wall of the lower end of the lifting column (5); a plurality of movable pulleys (7) are pivotally connected to the lifting shaft (6); a fixed pulley (10) is arranged at the upper end of the lifting groove (22); a steel wire rope (8) is wound around the fixed pulley (10) and the movable pulley (7); one end of the steel wire rope (8) is fixedly connected to a positioning steel plate (11), and the positioning steel plate (11) is fixed on the upper end surface of the ground (2); the other end of the steel wire rope (8) is connected to a winding mechanism (9).

2. A tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene according to claim 1, characterized in that: The nitration reactor (12) comprises two rows of vertical reaction tubes (121), the lower ends of the reaction tubes (121) are fixedly connected with longitudinal input tubes (122), the rear ends of the input tubes (122) are fixedly connected with vertical main inlet tubes (123), the main inlet tubes (123) are plugged and fixed on the support plate (3), a plurality of pads are fixedly connected to the input tubes (122), and the pads are fixedly connected to the bottom of the lifting frame (1); the upper ends of the reaction tubes (121) are fixedly connected with a plurality of output tubes (124), the upper ends of the output tubes (124) pass through the support plate (3) and are fixedly connected with main outlet tubes (125); the side walls of the lifting frame (1) are fixedly connected with auxiliary brackets (126), and the auxiliary brackets (126) are fixedly connected to the outer walls of the reaction tubes (121).

3. A tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene according to claim 1, characterized in that: Rectangular notches (31) are formed on both sides of the support plate (3), and the winding mechanism (9) and the positioning steel plate (11) are both located in the notches (31) of the support plate (3).

4. A tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene according to claim 3, characterized in that: The upper end surface of the positioning steel plate (11) is flush with the upper end surface of the supporting plate (3).

5. A tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene according to claim 3, characterized in that: The winding mechanism (9) comprises front and rear supporting end plates (92) which are opposite to each other and fixed to the ground (2); a longitudinal winding shaft (91) is hinged between the supporting end plates (92); both ends of the winding shaft (91) are connected to the supporting end plates (92) through bearings; one end of the winding shaft (91) extends out and is fixedly connected to a hand wheel (93); the steel wire rope (8) is wound around the winding shaft (91).

6. A tubular nitrifier for preparing 2,4-dichloro-3-fluoronitrobenzene according to claim 1, characterized in that: The movable pulleys (7) are provided with two groups, and the fixed pulleys (10) are provided with one group, and the fixed pulleys (10) are located between the movable pulleys (7); the movable pulleys (7) are arranged longitudinally, and the fixed pulleys (10) are arranged transversely, and the fixed pulleys (10) include a wheel body and a core shaft, and the core shaft is inserted in the wheel body; vertical grooves (23) are formed on the two side walls of the upper end of the lifting groove (22), and the two ends of the core shaft on the fixed pulley (10) are respectively inserted in the grooves (23) of the ground (2).

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