Continuous multiphase reactor for anthraquinone nitration reaction

Abstract

The utility model relates to the technical field of reactors, in particular to a continuous multiphase reactor for anthraquinone nitration reaction, which comprises a reactor shell with a reaction cavity, a plurality of partition plates are arranged in the reactor, and the partition plates sequentially divide the reaction cavity into a first reaction area, a second reaction area, a settling area and a separation area from top to bottom. A valve is mounted on the partition plate; a first feeding hole for anthracene to pass through, a second feeding hole for sulfuric acid to pass through, a third feeding hole for nitric acid to pass through and a water inlet for a water solution to pass through are formed in the shell, and a first reaction zone, a second reaction zone, a settling zone and a separation zone are arranged in the shell of the reactor; the production of nitroquinone can be completed in one reactor, the integration degree is improved, the occupied space of equipment is reduced, and material circulation is avoided, so that the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reactors, in particular to a continuous multiphase reactor for anthraquinone nitration reaction. Background Art

[0002] Nitroanthraquinone is an important organic chemical raw material widely used in dyes, drugs and chemical reaction catalysts. The production of nitroanthraquinone usually adopts the nitric acid nitration method. The nitric acid nitration method is a commonly used organic chemical reaction method. Its basic principle is to use nitric acid to react with organic compounds to introduce amino atoms into organic molecules. There are many types of existing reactors, but none of them can be directly used in the nitration reaction of nitroanthraquinone. It requires the use of multiple equipment to produce nitroanthraquinone. Therefore, there are many instruments used in the process of nitroanthraquinone production, which is more troublesome to operate. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to overcome the problem that there are many types of reactors in the prior art, but none of them can be directly used in the nitration reaction of nitroanthraquinone, and it requires the coordinated use of multiple equipment to produce nitroanthraquinone, therefore, many instruments are used in the process of nitroanthraquinone production, and the operation is relatively troublesome, a continuous multiphase reactor for the nitration reaction of anthraquinone is provided.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a continuous multiphase reactor for anthraquinone nitration reaction, comprising a reactor shell with a reaction chamber, a plurality of partition plates installed in the reactor, the partition plates sequentially divide the reaction chamber into a first reaction zone, a second reaction zone, a precipitation zone and a separation zone from top to bottom, and valves are installed on the partition plates;

[0005] The housing is provided with a first feed inlet for anthracene, a second feed inlet for sulfuric acid, a third feed inlet for nitric acid, and a water inlet for an aqueous solution. The first feed inlet is connected to the first reaction zone, the second feed inlet is connected to the first reaction zone, the third feed inlet is connected to the second reaction zone, and the water inlet is connected to the precipitation zone.

[0006] A temperature regulating unit for regulating the temperature of the second reaction zone is installed in the second reaction zone;

[0007] A screening unit for screening out solids precipitated from the reaction liquid in the precipitation zone is installed in the separation zone. By setting up the first reaction zone, the second reaction zone, the precipitation zone and the separation zone in the reactor shell, the production of nitroanthraquinone can be completed in one reactor, thereby improving the degree of integration, reducing the space occupied by equipment and avoiding the circulation of materials, thereby improving production efficiency.

[0008] In order to solve the problem of low contact degree between anthracene and sulfuric acid, which leads to low efficiency of mixed reaction, the method further includes a swirl block in the first reaction zone that shrinks from top to bottom toward the valve close to it, and the swirl block is fixedly connected to the partition plate located between the first reaction zone and the second reaction zone.

[0009] In order to solve the problem of how to arrange the temperature control unit, the temperature control unit further includes a medium inlet pipe, a medium outlet pipe and a plurality of heat exchange pipes. The medium inlet pipe is connected to the second reaction zone, the medium outlet pipe is connected to the second reaction zone, the heat exchange pipe is arranged in the second reaction zone, one end of the heat exchange pipe is connected to the medium inlet pipe, and the other end is connected to the medium outlet pipe.

[0010] In order to solve the problem of short travel in the second reaction zone and uneven distribution of nitric acid in the solution, the temperature adjustment unit further includes at least one baffle, the baffles are arranged in an alternating manner, and the baffles are fixedly connected to the reactor shell.

[0011] In order to solve the problem that the temperature of the reaction liquid initially input from the first reaction zone cannot meet the reaction requirements, the third feed inlet is further located between the first baffle and the partition plate between the second reaction zone and the precipitation zone, so that it can preheat the reaction liquid input from the first reaction zone.

[0012] It further comprises that the heat exchange tube is in a U-shaped structure, and the bottom of the heat exchange tube extends to the partition plate between the second reaction zone and the precipitation zone.

[0013] In order to solve the problem of low stability of the baffle, the temperature adjustment unit further includes a connecting rod, the end of the connecting rod is fixedly connected to the partition plate, and the baffle is fixedly connected to the connecting rod.

[0014] The invention further comprises a screening unit including a guide plate and a screening frame. The guide plate is fixedly connected to the reactor shell. The screening frame is arranged below the guide plate. The guide plate is used to guide the materials in the sedimentation area into the screening frame.

[0015] The beneficial effect of the utility model is that the utility model provides a continuous multiphase reactor for anthraquinone nitration reaction, which sets up a first reaction zone, a second reaction zone, a precipitation zone and a separation zone in the reactor shell, so that the production of nitroanthraquinone can be completed in one reactor, thereby improving the degree of integration, reducing the space occupied by equipment and avoiding the circulation of materials, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 This utility model Figure 1 An enlarged structural diagram of the middle temperature control unit;

[0019] Figure 3 It is a structural schematic diagram of embodiment 2 of the present utility model.

[0020] In the figure: 1, reactor shell, 11, first reaction zone, 111, cyclone block, 12, second reaction zone, 13, precipitation zone, 14, separation zone, 15, first feed inlet, 16, second feed inlet, 17, third feed inlet, 18, water inlet;

[0021] 2. separator plate, 21. valve;

[0022] 3. Temperature adjustment unit, 31. Medium inlet pipe, 32. Medium outlet pipe, 33. Heat exchange pipe, 34. Baffle, 35. Connecting rod;

[0023] 4. Screening unit, 41. Guide plate, 42. Screening frame. DETAILED DESCRIPTION

[0024] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0025] Embodiment 1:

[0026] like Figure 1 The utility model is a structural schematic diagram of a continuous multiphase reactor for anthraquinone nitration reaction, comprising a reactor shell 1 having a reaction chamber, a plurality of partition plates 2 installed in the reactor, the partition plates 2 sequentially divide the reaction chamber from top to bottom into a first reaction zone 11, a second reaction zone 12, a precipitation zone 13 and a separation zone 14, the first reaction zone 11 is used for anthraquinone and sulfuric acid to react, the second reaction zone 12 is used for nitric acid and the reaction liquid produced in the first reaction zone 11 to react, the precipitation zone 13 is used for precipitating nitroanthraquinone, and the separation zone 14 is used for separating nitroanthraquinone and liquid, by setting up the first reaction zone 11, the second reaction zone 12, the precipitation zone 13 and the separation zone 14 in the reactor shell, the production of nitroanthraquinone can be completed in one reactor, the degree of integration is improved, the space occupied by the equipment is reduced and the circulation of materials is avoided, thereby improving the production efficiency, and a valve 21 is installed on the partition plate 2;

[0027] The housing is provided with a first feed port 15 for anthracene to pass through, a second feed port 16 for sulfuric acid to pass through, a third feed port 17 for nitric acid to pass through, and a water inlet 18 for an aqueous solution to pass through. The first feed port 15 is connected to the first reaction zone 11, the second feed port 16 is connected to the first reaction zone 11, the third feed port 17 is connected to the second reaction zone 12, the third feed port 17 is located between the first baffle plate 34 and the partition plate 2 between the second reaction zone 12 and the precipitation zone 13, so that a preheating zone is formed between the first baffle plate 34 and the partition plate 2 between the first reaction zone 11 and the second reaction zone 12, so that the reaction liquid input into the first reaction zone 11 is adjusted to the reaction temperature, and the water inlet 18 is connected to the precipitation zone 13;

[0028] The first reaction zone 11 has a swirl block 111 that shrinks from top to bottom toward the valve 21 close to it. The swirl block 111 has a swirl area in an inverted cone state. The surface of the swirl block 111 has a spiral protrusion, which can make the onions disperse in a spiral shape and make the sulfuric acid form a spiral flow, thereby increasing the contact between the onions and the sulfuric acid, thereby improving the reaction efficiency. The swirl block 111 is fixedly connected to the partition plate 2 located between the first reaction zone 11 and the second reaction zone 12.

[0029] A temperature control unit 3 for adjusting the temperature of the second reaction zone 12 is installed in the second reaction zone 12, so that the temperature is maintained at the temperature at which the nitric acid and the reaction liquid produced in the first reaction zone 11 continue to react. The temperature control unit 3 includes a medium inlet pipe 31, a medium outlet pipe 32 and a plurality of heat exchange pipes 33. The medium inlet pipe 31 is connected to the second reaction zone 12, the medium outlet pipe 32 is connected to the second reaction zone 12, the heat exchange pipe 33 is arranged in the second reaction zone 12, one end of the heat exchange pipe 33 is connected to the medium inlet pipe 31, and the other end is connected to the medium outlet pipe 32. The heat exchange pipe 33 has a U-shaped structure, and the bottom of the heat exchange pipe 33 extends to the partition plate 2 located between the second reaction zone 12 and the precipitation zone 13, so that the heat exchange pipe 33 fills the second reaction zone 12 and maintains the overall temperature balance in the second reaction zone 12.

[0030] The temperature control unit 3 includes at least one baffle 34. In the present application, four baffles 34 are arranged at intervals. The present application does not make any specific limitation on this. The baffles 34 are fixedly connected to the reactor shell 1. The baffles 34 are arranged in a staggered manner. When the left end of the baffle 34 is fixedly connected to the reactor shell 1, a gap for fluid to pass through is left between the right end of the baffle 34 and the reactor shell 1. The baffle 34 adjacent to the above baffle 34 is fixedly connected to the reactor shell 1 at the right end.

[0031] The temperature control unit 3 includes a connecting rod 35, the end of the connecting rod 35 is fixedly connected to the partition plate 2, and the baffle 34 is fixedly connected to the connecting rod 35. The baffle 34 is connected by the connecting rod 35 to increase the stability of the baffle 34.

[0032] A screening unit 4 for screening out solids precipitated from the reaction liquid in the precipitation zone 13 is installed in the separation zone 14. The screening unit 4 includes a guide plate 41 and a screening frame 42. The guide plate 41 is fixedly connected to the reactor housing 1. The screening frame 42 is arranged below the guide plate 41. The guide plate 41 is used to guide the material in the precipitation zone 13 into the screening frame 42. The guide plate 41 has a guide surface that shrinks from top to bottom toward the screening block 42. The screening frame 42 has a screen that can allow liquid to pass through and block nitroanthraquinone to complete solid-liquid separation.

[0033] Embodiment 2:

[0034] The technical feature that distinguishes Example 2 from Example 1 is the connection of the connecting rod 35 .

[0035] One end of the connecting rod 35 is fixedly connected to the partition plate 2 between the first reaction zone 11 and the second reaction zone 12 , and the other end of the connecting rod 35 is fixedly connected to the partition plate 2 between the precipitation zone 13 and the second reaction zone 12 .

[0036] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A continuous multiphase reactor for anthraquinone nitration reaction, characterized in that: It comprises a reactor shell (1) having a reaction chamber, wherein a plurality of partition plates (2) are installed in the reactor, wherein the partition plates (2) sequentially divide the reaction chamber into a first reaction zone (11), a second reaction zone (12), a precipitation zone (13) and a separation zone (14) from top to bottom, and a valve (21) is installed on the partition plates (2); The housing is provided with a first feed port (15) for anthracene to pass through, a second feed port (16) for sulfuric acid to pass through, a third feed port (17) for nitric acid to pass through, and a water inlet (18) for an aqueous solution to pass through, the first feed port (15) being connected to the first reaction zone (11), the second feed port (16) being connected to the first reaction zone (11), the third feed port (17) being connected to the second reaction zone (12), and the water inlet (18) being connected to the precipitation zone (13); A temperature regulating unit (3) for regulating the temperature of the second reaction zone (12) is installed in the second reaction zone (12); The separation zone (14) is provided with a screening unit (4) for screening out solid matter precipitated from the reaction liquid in the precipitation zone (13).

2. A continuous multiphase reactor for anthraquinone nitration reaction as claimed in claim 1, characterized in that: The first reaction zone (11) has a swirl block (111) that contracts from top to bottom toward a valve (21) to which it is close, and the swirl block (111) is fixedly connected to a partition plate (2) located between the first reaction zone (11) and the second reaction zone (12).

3. A continuous multiphase reactor for anthraquinone nitration reaction according to claim 1, characterized in that: The temperature control unit (3) comprises a medium inlet pipe (31), a medium outlet pipe (32) and a plurality of heat exchange pipes (33); the medium inlet pipe (31) is connected to the second reaction zone (12); the medium outlet pipe (32) is connected to the second reaction zone (12); the heat exchange pipe (33) is arranged in the second reaction zone (12); one end of the heat exchange pipe (33) is connected to the medium inlet pipe (31); and the other end of the heat exchange pipe (33) is connected to the medium outlet pipe (32).

4. A continuous multiphase reactor for anthraquinone nitration reaction as claimed in claim 3, characterized in that: The temperature control unit (3) comprises at least one baffle (34), the baffles (34) are arranged in a staggered manner, and the baffles (34) are fixedly connected to the reactor shell (1).

5. A continuous multiphase reactor for anthraquinone nitration reaction as claimed in claim 4, characterized in that: The third feed port (17) is located between the first baffle (34) and the partition plate (2) between the second reaction zone (12) and the precipitation zone (13).

6. A continuous multiphase reactor for anthraquinone nitration reaction as claimed in claim 3, characterized in that: The heat exchange tube (33) has a U-shaped structure, and the bottom of the heat exchange tube (33) extends to the partition plate (2) located between the second reaction zone (12) and the precipitation zone (13).

7. A continuous multiphase reactor for anthraquinone nitration reaction as claimed in claim 4, characterized in that: The temperature adjustment unit (3) comprises a connecting rod (35), the end of the connecting rod (35) is fixedly connected to the partition plate (2), and the baffle plate (34) is fixedly connected to the connecting rod (35).

8. The continuous multiphase reactor for anthraquinone nitration reaction according to claim 1, characterized in that: The screening unit (4) comprises a guide plate (41) and a screening frame (42); the guide plate (41) is fixedly connected to the reactor housing (1); the screening frame (42) is arranged below the guide plate (41); and the guide plate (41) is used to guide the material in the sedimentation area (13) into the screening frame (42).

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