CN116173870A

CN116173870A - Continuous water washing kettle for preparing 2, 5-dichloronitrobenzene

Info

Publication number: CN116173870A
Application number: CN202310189870.7A
Authority: CN
Inventors: 崔伟伟; 吴春江; 张剑宇
Original assignee: Jiangsu Longchang Chemical Co Ltd
Current assignee: Jiangsu Longchang Chemical Co Ltd
Priority date: 2023-03-01
Filing date: 2023-03-01
Publication date: 2023-05-30

Abstract

The invention discloses a continuous water washing kettle for preparing 2, 5-dichloronitrobenzene, which relates to the technical field of water washing kettles and comprises a support frame, a reaction tank, a liquid dividing groove, a water suction pump and a treatment tank, wherein the reaction tank is arranged on the upper side of the support frame and comprises a sealing cover, a first feeding port, a second feeding port, a stirring motor, stirring blades, a track, rolling balls, a connecting plate, a rotating rod and a scraping frame. According to the continuous water washing kettle for preparing 2, 5-dichloronitrobenzene, the stirring motor is started to drive the stirring blade and the scraping frame to rotate, so that the stirring blade is subjected to water washing operation in a stirring state, residual materials on the inner wall of the reaction tank can be uniformly stirred through the scraping frame, and the water solution and the 2, 5-dichloronitrobenzene solution can be automatically separated through the arranged liquid separating tank, so that the continuous operation at the upstream and downstream of the water washing process is realized, the contact of personnel is reduced, and the intrinsic safety of the 2, 5-dichloronitrobenzene preparation process is improved.

Description

Continuous water washing kettle for preparing 2, 5-dichloronitrobenzene

Technical Field

The invention relates to the technical field of water washing kettles, in particular to a continuous water washing kettle for preparing 2, 5-dichloronitrobenzene.

Background

2, 5-dichloronitrobenzene, chinese alias: o-nitro-1, 4-dichlorobenzene, 2, 5-dichloronitrobenzene, 1, 4-dichloro-2-nitrobenzene, nitro-p-dichlorobenzene, o-nitro-1, 4-dichlorobenzene, 2-nitro-1, 4-dichlorobenzene, 6-nitro-1, 4-dichlorobenzene, p-dichloronitrobenzene. The 2, 5-dichloronitrobenzene can be used as a dye intermediate, is used for the ice-dyeing of dye scarlet base GG, red base 3GL, red base RC and the like, is also a nitrogenous fertilizer synergist, and has the functions of nitrogen fixation and fertilizer preservation. The preparation process principle of the 2, 5-dichloronitrobenzene is that mixed acid of sulfuric acid and nitric acid is used as a nitrating agent, p-dichlorobenzene is nitrated to obtain a target substance, and then the target substance is layered, neutralized and washed to obtain a product. The raw material p-dichlorobenzene used in the product is self-produced, and the raw material p-dichlorobenzene is easy to obtain and has low cost.

According to the patent number: 202022625551.0A continuous washing kettle for preparing dichloronitrobenzene, after the stirring of the raw materials in a first box body is completed, a piston rod is pulled rightwards by a user to drive a positioning rod to be separated from a limiting groove, at the moment, the positioning rod does not limit a movable rod any more, a rotating rod and stirring blades can be taken out from the first box body after a sealing cover is opened, when any problem occurs in a stirring device, the user can conveniently detach and replace the stirring device, the inside of the first box body is hollow after the stirring device is taken out, the user can carefully clean the inside of the first box body, the cleaning efficiency of the washing kettle is integrally improved, and the user can clean impurities filtered by a filter plate and cannot be blocked through the movable door arranged in a second box body;

above-mentioned technical scheme is when using, stirs the washing raw materials through dwang and the stirring vane that sets up to behind the impurity of filter filtration, product solution and aqueous solution do not obtain separating after the production, make after deriving, product solution produces the cooling easily, make 2, 5-dichloronitrobenzene at room temperature comparatively difficult when carrying out the separation subsequently.

Disclosure of Invention

The invention aims to provide a continuous water washing kettle for preparing 2, 5-dichloronitrobenzene, which aims to solve the problems of the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: a continuous water washing kettle for preparing 2, 5-dichloronitrobenzene comprises a supporting frame, a reaction tank, a liquid dividing tank, a water suction pump and a treatment tank,

the overhead of support frame installs the retort, the retort is including sealed lid, charge door, no. two charge door, agitator motor, stirring leaf, track, rolling ball, connecting plate, dwang and scraping the work or material rest, the top butt joint of retort has sealed lid, and the upside symmetry of sealed lid is provided with the charge door that is used for adding the raw materials and is used for heating the hydrothermal No. two charge doors, the mid-mounting of sealed lid has agitator motor, the level gauge is installed in the outside of retort, the bottom butt joint of retort has the automatically controlled valve who is used for discharging the mixed liquid, the downside of automatically controlled valve is provided with the branch cistern.

Preferably, the bottom of the stirring motor is connected with a stirring blade, and a track is fixed on the upper side of the inner wall of the reaction tank.

Preferably, the inner side of the track is connected with a rolling ball, and the rolling ball is in butt joint with the connecting plate through a rotating shaft in the middle.

Preferably, the connecting plates are fixed with the rotating rods, one ends of the rotating rods, which are far away from the connecting plates, are in butt joint with the stirring She Waibi, and the lower sides of the two connecting plates are fixed with scraping frames.

Preferably, the liquid separating tank comprises an upper liquid outlet pipe and a lower liquid outlet pipe, wherein the upper liquid outlet pipe is in butt joint with the middle part of one side of the liquid separating tank, and the lower liquid outlet pipe is in butt joint with the bottom of the liquid separating tank.

Preferably, the lower end of the lower liquid outlet pipe is connected with the water diversion end of the water suction pump.

Preferably, the water outlet end of the water suction pump is connected with a treatment tank, the treatment tank comprises a liquid outlet cylinder, a limiting cover, a motor, a connecting column, a spiral blade, a blocking cover, a convex strip, a spring, a buffer layer and a water absorption layer, and the liquid outlet cylinder is horizontally fixed at the inner inlet end of the treatment tank;

the outer wall welding of play liquid section of thick bamboo has the limit cap, the motor is installed to one side that the processing jar kept away from play liquid section of thick bamboo.

Preferably, a connecting column is fixed on the output shaft of the motor, a spiral blade is fixed at one end of the connecting column far away from the output shaft of the motor, and the spiral She Chajie is arranged at the inner side of the liquid outlet cylinder;

the connecting column is of a cross-shaped structure, the central section of the connecting column is of a square structure with rounded corners, and the outer side of the connecting column is in sliding sleeve joint with a baffle cover;

the inner wall of the baffle cover is provided with a convex strip, the outer wall of the motor output shaft is provided with a limiting disc, and a spring is connected between the limiting disc and the outer wall of the baffle cover.

Preferably, a buffer layer is arranged on the inner wall of the treatment tank near the lower side of the baffle cover, and a water absorption layer is arranged at the bottom of the buffer layer.

Preferably, a water outlet is formed in the lower end of one side, far away from the water suction pump, of the treatment tank, and an access door is embedded in the outer side of the treatment tank.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the continuous water washing kettle for preparing 2, 5-dichloronitrobenzene, the stirring motor is started to drive the stirring blade and the scraping frame to rotate, so that the stirring blade is subjected to water washing operation in a stirring state, materials remained on the inner wall of the reaction tank can be uniformly stirred through the scraping frame, and the water solution and the 2, 5-dichloronitrobenzene solution can be automatically separated through the liquid separating tank, so that continuous operation at the upstream and downstream of a water washing process is realized, personnel contact is reduced, and the intrinsic safety of a 2, 5-dichloronitrobenzene preparation process is improved;

2. according to the continuous water washing kettle for preparing 2, 5-dichloronitrobenzene, the water suction pump is started, so that 2, 5-dichloronitrobenzene solution in the lower liquid outlet pipe is injected into the liquid outlet cylinder, the motor is started to drive the spiral blade to continuously impact the solution to the baffle cover, the baffle cover which is rotated and convex strips distributed at equal included angles are scattered when the 2, 5-dichloronitrobenzene solution with a small amount of aqueous solution is continuously injected, the baffle cover is pushed against when the 2, 5-dichloronitrobenzene solution with a small amount of aqueous solution is continuously injected, and therefore the fully scattered mixed solution is sprayed out of the liquid outlet cylinder, and the 2, 5-dichloronitrobenzene solution with a small amount of aqueous solution can be scattered through the arranged treatment tank, so that the small amount of aqueous solution in the 2, 5-dichloronitrobenzene solution can be conveniently separated;

3. according to the prepared continuous water washing kettle, when the water solution and the 2, 5-dichloronitrobenzene are sprayed out, the buffer layer can achieve the effect of slowing down the impact, meanwhile, sprayed solution flows to the water absorption layer along the gap of the buffer layer, so that the water absorption cotton in the water absorption layer absorbs a small part of the scattered water solution, most of the 2, 5-dichloronitrobenzene solution flows to the position of the water outlet along the diversion gap in the water absorption layer to be discharged, the access door is opened regularly, the water absorption layer is exposed out of the side surface of the treatment tank, and therefore the water absorption cotton for water removal can be replaced regularly, and the purity of the 2, 5-dichloronitrobenzene solution obtained by subsequent collection is guaranteed to be higher.

Drawings

FIG. 1 is a schematic diagram of a front view structure of the present invention;

FIG. 2 is a schematic diagram of a sectional front view of a reaction tank according to the present invention;

FIG. 3 is a schematic top view cross-sectional structure of the track of the present invention;

FIG. 4 is a schematic cross-sectional front view of a treatment tank according to the present invention;

fig. 5 is a schematic view of a left-hand cross-sectional structure of the shield of the present invention.

In the figure: 1. a support frame; 2. a reaction tank; 21. sealing cover; 22. a first charging port; 23. a second charging port; 24. a stirring motor; 25. stirring the leaves; 26. a track; 27. a rolling ball; 28. a connecting plate; 29. a rotating lever; 210. a scraping frame; 3. a liquid level gauge; 4. an electric control valve; 5. a liquid dividing tank; 51. an upper liquid outlet pipe; 52. a lower liquid outlet pipe; 6. a water pump; 7. a treatment tank; 71. a liquid outlet cylinder; 72. a limiting cover; 73. a motor; 74. a connecting column; 75. spiral leaves; 76. a shield; 77. a convex strip; 78. a spring; 79. a buffer layer; 710. a water-absorbing layer; 8. a water outlet; 9. an access door.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a continuous water washing cauldron of preparation 2, 5-dichloronitrobenzene, including support frame 1, retort 2, divide the cistern 5, suction pump 6 and treatment jar 7, retort 2 is installed to the upside of support frame 1, and retort 2 is the toper structure, retort 2 is including sealed lid 21, no. one charge door 22, no. two charge door 23, agitator motor 24, stirring leaf 25, track 26, rolling ball 27, connecting plate 28, dwang 29 and scraping the work or material rest 210, the top butt joint of retort 2 has sealed lid 21, and the upside symmetry of sealed lid 21 is provided with the charge door 22 that is used for adding the raw materials and is used for heating No. two charge door 23 of water, the mid-mounting of sealed lid 21 has agitator motor 24, the level gauge 3 is installed in the outside of retort 2, the bottom butt joint of retort 2 has the automatically controlled valve 4 that is used for discharging the mixed liquid, the downside of automatically controlled valve 4 is provided with divides the cistern 5.

The bottom end of the stirring motor 24 is connected with a stirring blade 25, a track 26 is fixed on the upper side of the inner wall of the reaction tank 2, and an annular groove is formed in the inner side of the track 26; the inner side of the track 26 is connected with a rolling ball 27, and the rolling ball 27 is butted with a connecting plate 28 through a rotating shaft in the middle.

In specific implementation, two groups of connecting plates 28 which are in butt joint with the rotating rods 29 are arranged on the inner ring of the track 26, and two rolling balls 27 are movably connected to the outer sides of the connecting plates 28, so that the rotating rods 29 can drive the scraping frame 210 to stably scrape along the inner wall of the reaction tank 2 during rotation.

The connecting plate 28 is fixed with the dwang 29 mutually, and the one end that the dwang 29 kept away from the connecting plate 28 dock with stirring leaf 25 outer wall, and the downside of two connecting plates 28 is fixed with scrapes work or material rest 210, scrapes the work or material rest 210 and is "V" style of calligraphy, and scrapes the outer wall of work or material rest 210 and laminating mutually with the inner wall of retort 2, scrapes the downside of work or material rest 210 and peg graft with the bottom of stirring leaf 25.

In the specific implementation, when the material of the 2, 5-dichloronitrobenzene is prepared, the 2, 5-dichloronitrobenzene is added into a reaction tank 2 along a first charging port 22, hot water is continuously put into the reaction tank 2 of the water washing kettle along a second charging port 23 in proportion, and when a liquid level meter 3 reaches a preset standard position, a stirring motor 24 is started to drive a stirring blade 25 and a scraping frame 210 to rotate, so that the stirring blade 25 performs water washing operation in a stirring state, and residual materials on the inner wall of the reaction tank 2 can be stirred uniformly through the scraping frame 210;

when the scraping frame 210 rotates, the two ends of the top of the scraping frame 210 rotate along with the connecting plate 28 and the rotating rod 29, and the two rolling balls 27 outside the connecting plate 28 roll in the annular track 26, so that the continuous water washing kettle is guaranteed to have an efficient mixing effect when washing the prepared 2, 5-dichloronitrobenzene.

The liquid separating tank 5 comprises an upper liquid outlet pipe 51 and a lower liquid outlet pipe 52, the upper liquid outlet pipe 51 is in butt joint with the middle part of one side of the liquid separating tank 5, the lower liquid outlet pipe 52 is in butt joint with the bottom of the liquid separating tank 5, net barrels are arranged in the liquid separating tank 5 and at the upper end of the lower liquid outlet pipe 52, and stainless steel hollow sealing balls are arranged in the net barrels. The lower end of the lower liquid outlet pipe 52 is connected with the water diversion end of the water pump 6, and a jacket steam heating structure is arranged at the outer side of the liquid dividing groove 5, so that the temperature of the liquid in the liquid dividing groove 5 is controlled to be between 60 and 70 ℃, and materials in the groove are automatically layered according to different specific gravities.

In the concrete implementation, as the density of water is 1g/cm < 3 >, and the product prepared by the continuous water washing kettle is 2, 5-dichloronitrobenzene, the density of the prepared 2, 5-dichloronitrobenzene is about 1.442g/cm < 3 >, therefore, the density of the stainless steel hollow sealing ball is controlled between 1.2-1.3g/cm < 3 >, and when the electric control valve 4 is opened, the mixed liquid in the reaction tank 2 is completely injected into the liquid separating tank 5;

because the water and the 2, 5-dichloronitrobenzene are not compatible, and the density of the water is smaller than that of the 2, 5-dichloronitrobenzene, the water is positioned at the upper layer of the liquid separating tank 5, and the 2, 5-dichloronitrobenzene is positioned at the lower layer of the liquid separating tank 5; firstly, a stainless steel hollow sealing ball with the density controlled between 1.2 and 1.3g/cm < 3 > is positioned in 2, 5-dichloronitrobenzene solution, so that the sealing ball floats, the 2, 5-dichloronitrobenzene solution flows to the position of a water suction pump 6 along a lower liquid outlet pipe 52, and when the sealing ball contacts with aqueous solution, the sealing ball falls down to block the upper port of the lower liquid outlet pipe 52; at this time, the upper drain pipe 51 is made to be separated by opening the drain pump of the upper drain pipe 51 to draw out the aqueous solution.

The water outlet end of the water suction pump 6 is connected with a treatment tank 7, the treatment tank 7 comprises a liquid outlet cylinder 71, a limiting cover 72, a motor 73, a connecting column 74, a spiral blade 75, a baffle cover 76, a convex strip 77, a spring 78, a buffer layer 79 and a water absorption layer 710, and the liquid outlet cylinder 71 is horizontally fixed at the inner inlet end of the treatment tank 7; the outer wall of the liquid outlet cylinder 71 is welded with a limiting cover 72, and a motor 73 is arranged on one side of the treatment tank 7 away from the liquid outlet cylinder 71. A connecting column 74 is fixed on the output shaft of the motor 73, a spiral blade 75 is fixed at one end of the connecting column 74 far away from the output shaft of the motor 73, the spiral blade 75 is inserted into the inner side of the liquid outlet cylinder 71, and the output shaft of the motor 73 and the liquid outlet cylinder 71 are positioned on the same axis.

In specific implementation, the water pump 6 is started, so that the water pump 6 injects the 2, 5-dichloronitrobenzene solution in the lower liquid outlet pipe 52 into the liquid outlet cylinder 71, and the starting motor 73 drives the spiral blade 75 to continuously impact the solution to the baffle cover 76.

The connecting column 74 is of a cross-shaped structure, the central section of the connecting column 74 is of a square structure with rounded corners, and the outer side of the connecting column 74 is in sliding sleeve connection with the baffle cover 76; the inner wall that keeps off the cover 76 is provided with sand grip 77, and sand grip 77 is the equal contained angle and distributes, and the outer wall of motor 73 output shaft is provided with the spacing dish, and is connected with spring 78 between spacing dish and the outer wall of keeping off the cover 76, keeps off the cover 76 and constitutes sliding construction through spring 78 and spliced pole 74.

In specific implementation, at this time, the 2, 5-dichloronitrobenzene solution with a small amount of aqueous solution is scattered by the rotating baffle cover 76 and the convex strips 77 distributed at equal included angles when being continuously injected, and the 2, 5-dichloronitrobenzene solution with a small amount of aqueous solution pushes the baffle cover 76 when being continuously injected, so that the baffle cover 76 slides along the connecting column 74, and a gap between the baffle cover 76 and the limiting cover 72 is gradually increased when the spring 78 is extruded, so that the mixed solution after being fully scattered is sprayed out from the liquid outlet cylinder 71, after a part of solution is sprayed out, the pressure of the introduced mixed solution is smaller than the thrust of the spring 78, and at this time, most of the mixed solution is sealed between the liquid outlet cylinder 71, the limiting cover 72 and the baffle cover 76, so that the treatment tank 7 scatters the 2, 5-dichloronitrobenzene solution with a small amount of aqueous solution is collected, and the pressure of the water absorption layer 710 can be reduced.

The lower side that the inner wall of the treatment tank 7 is close to the baffle cover 76 is provided with a buffer layer 79, and the bottom of the buffer layer 79 is provided with a water absorption layer 710, the buffer layer 79 is composed of V-shaped guide plates distributed at equal intervals, the opening direction of the V-shaped guide plates is horizontal, the water absorption layer 710 is composed of a supporting frame, water absorption cotton and guide gaps, and the supporting frame is used for supporting and placing the water absorption cotton.

In practice, the sprayed solution is buffered by the buffer layer 79, so that the sprayed solution flows to the water absorbing layer 710 along the gap of the buffer layer 79, so that the absorbent cotton in the water absorbing layer 710 absorbs a small part of the scattered aqueous solution, and most of the 2, 5-dichloronitrobenzene solution flows to the water outlet 8 along the diversion gap in the water absorbing layer 710 for discharge.

The lower extreme of treatment tank 7 side away from suction pump 6 side is provided with outlet 8, and access door 9 is installed in the outside embedding of treatment tank 7.

In specific implementation, the access door 9 is opened periodically, so that the area of the water-absorbing layer 710 is exposed from the side surface of the treatment tank 7, and therefore, the water-absorbing cotton for removing water can be replaced periodically, and the purity of the 2, 5-dichloronitrobenzene solution obtained by subsequent collection is ensured to be higher.

In summary, the objective is obtained by nitrifying p-dichlorobenzene with a mixed acid of sulfuric acid and nitric acid as a nitrifying agent, and then layering, neutralizing and washing to obtain a 2, 5-dichloronitrobenzene product, wherein 2, 5-dichloronitrobenzene is added into a reaction tank 2 along a first feed port 22, hot water is continuously put into the reaction tank 2 of the washing kettle along a second feed port 23 in proportion, two solutions which are different in density and are mutually insoluble are automatically layered through a liquid separating tank 5, and a small amount of aqueous solution is scattered through a treatment tank 7, so that the water absorbing layer 710 sucks the aqueous solution when the aqueous solution is sprayed out, and the 2, 5-dichloronitrobenzene solution with higher purity can be led out from a water outlet 8.

Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims

1. The utility model provides a continuous water washing cauldron of preparation 2, 5-dichloronitrobenzene, includes support frame (1), retort (2), divide cistern (5), suction pump (6) and treatment tank (7), its characterized in that:

the overhead connection of support frame (1) has retort (2), retort (2) are including sealed lid (21), charge door (22), no. two charge door (23), agitator motor (24), stirring leaf (25), track (26), rolling ball (27), connecting plate (28), dwang (29) and scrape work or material rest (210), sealed lid (21) have been docked at the top of retort (2), and the upside symmetry of sealed lid (21) is provided with charge door (22) and No. two charge door (23) that are used for adding the raw materials, agitator motor (24) are installed to the mid-mounting of sealed lid (21), level gauge (3) are installed in the outside of retort (2), the bottom butt joint of retort (2) has electric control valve (4) that are used for discharging the mixed liquid, the downside of electric control valve (4) is provided with branch cistern (5).

2. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 1, characterized in that: the bottom of stirring motor (24) is connected with stirring leaf (25), the inner wall upside of retort (2) is fixed with track (26).

3. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 2, characterized in that: the inner side of the track (26) is connected with a rolling ball (27), and the rolling ball (27) is in butt joint with a connecting plate (28) through a rotating shaft in the middle.

4. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 3, characterized in that: the connecting plates (28) are fixed with the rotating rods (29), one ends of the rotating rods (29) far away from the connecting plates (28) are in butt joint with the outer walls of the stirring blades (25), and scraping frames (210) are fixed on the lower sides of the two connecting plates (28).

5. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 1, characterized in that: the liquid separating tank (5) comprises an upper liquid outlet pipe (51) and a lower liquid outlet pipe (52), the upper liquid outlet pipe (51) is in butt joint with the middle part of one side of the liquid separating tank (5), and the lower liquid outlet pipe (52) is in butt joint with the bottom of the liquid separating tank (5).

6. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 5, characterized in that: the lower end of the lower liquid outlet pipe (52) is connected with the water leading end of the water pump (6).

7. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 1, characterized in that: the water outlet end of the water suction pump (6) is connected with a treatment tank (7), the treatment tank (7) comprises a liquid outlet cylinder (71), a limiting cover (72), a motor (73), a connecting column (74), a spiral blade (75), a baffle cover (76), a raised line (77), a spring (78), a buffer layer (79) and a water absorption layer (710), and the liquid outlet cylinder (71) is horizontally fixed at the inner inlet end of the treatment tank (7);

the outer wall welding of play liquid section of thick bamboo (71) has limit cap (72), one side that goes away from play liquid section of thick bamboo (71) of treatment jar (7) is installed motor (73).

8. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 7, characterized in that: a connecting column (74) is fixed on the output shaft of the motor (73), a spiral blade (75) is fixed at one end of the connecting column (74) away from the output shaft of the motor (73), and the spiral blade (75) is inserted into the inner side of the liquid outlet cylinder (71);

the connecting column (74) is of a cross-shaped structure, the central section of the connecting column (74) is of a square structure with rounded corners, and a baffle cover (76) is sleeved on the outer side of the connecting column (74) in a sliding manner;

the inner wall of the baffle cover (76) is provided with a convex strip (77), the outer wall of the output shaft of the motor (73) is provided with a limiting disc, and a spring (78) is connected between the limiting disc and the outer wall of the baffle cover (76).

9. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 8, characterized in that: the inner wall of the treatment tank (7) is provided with a buffer layer (79) near the lower side of the baffle cover (76), and the bottom of the buffer layer (79) is provided with a water absorption layer (710).

10. A continuous water tank for preparing 2, 5-dichloronitrobenzene according to claim 9, characterized in that: the lower extreme that handles jar (7) one side of keeping away from suction pump (6) is provided with outlet (8), access door (9) are installed in the outside embedding of handling jar (7).