Hydrogenation reaction device for producing p-aminophenol

Abstract

The utility model belongs to the technical field of p-aminophenol production equipment, and particularly relates to a hydrogenation reaction device for p-aminophenol production, which comprises a reaction kettle body, a motor is fixedly connected to the top of the reaction kettle body, a rotating shaft is fixedly connected to the output end of the motor, the rotating shaft is positioned in the reaction kettle body, and a first cavity is formed in the rotating shaft. A gas inlet window is formed in the outer surface of the rotating shaft, stirring blades are fixedly connected to the outer surface of the rotating shaft, second cavities are formed in the stirring blades, through holes are formed in the outer surfaces of the stirring blades, a protection pipe is fixedly connected to the inner top of the reaction kettle body, the gas inlet window is located in the protection pipe, and a connecting pipe is fixedly connected to the side wall of the protection pipe; an air inlet pipe is mounted on the side wall of the reaction kettle body, and one end of the air inlet pipe is fixedly connected with a threaded pipe. Under the action of the rotating shaft, the connecting pipe and the gas inlet pipe, hydrogen enters the first cavity in the rotating shaft through the gas inlet window and then is discharged through the through holes in the stirring blades, so that submerged hydrogenation is realized during production of aminophenol, and production of p-aminophenol is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of p-aminophenol production equipment, in particular to a hydrogenation reaction device for p-aminophenol production. Background Art

[0002] p-Aminophenol, also known as p-hydroxyaniline, is a widely used organic synthesis intermediate, mainly used in the fields of dyes, medicine and rubber. The synthesis of p-aminophenol using nitrobenzene as raw material has obvious raw material advantages over the nitrophenol method. According to the reduction method, it is divided into two processes: nitrobenzene catalytic hydrogenation method and nitrobenzene electrolytic reduction method. The synthesis of p-aminophenol by catalytic hydrogenation of nitrobenzene usually uses precious metals such as platinum, rhodium, and palladium as catalysts and reacts in a dilute sulfuric acid medium. In the reaction, nitrobenzene is first hydrogenated to form the intermediate product phenylhydroxylamine, and then phenylhydroxylamine is rearranged to p-aminophenol in an acidic medium.

[0003] After searching, the patent with publication number CN219400138U discloses "a hydrogenation reaction device for the production of p-aminophenol". This patent mainly uses an air pump to draw hydrogen from a gas tank into a hydrogenation pipe and spray it out from a gas nozzle, and then cooperates with the rotation of a stirring rod to enable the hydrogenation rod to stir p-nitrophenol, so that the hydrogen can fully contact with p-nitrophenol, making the reaction between p-nitrophenol and hydrogen more complete, and the quality of the obtained p-aminophenol is more stable and uniform.

[0004] However, in the above patent, the rotation of the stirring rod driven by the motor will also drive the hydrogenation tube to rotate, which makes it easy for the hydrogenation tube to be entangled on the stirring rod. There is a risk that the stirring rod will tear the hydrogenation tube apart when rotating. Moreover, after the hydrogenation tube is entangled on the stirring rod, the hydrogenation tube will be squeezed, and the gas inside will not easily enter the interior of the reactor through the hydrogenation tube, thereby affecting the production of p-aminophenol. Summary of the invention

[0005] The utility model aims to provide a hydrogenation reaction device for the production of p-aminophenol, which realizes the underwater hydrogenation during the production of aminophenol and is beneficial to the production of p-aminophenol.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a hydrogenation reaction device for the production of p-aminophenol, including a reactor body, a motor is fixedly connected to the top of the reactor body, a rotating shaft is fixedly connected to the output end of the motor, the rotating shaft is located inside the reactor body, a first cavity is opened inside the rotating shaft, an air intake window is opened on the outer surface of the rotating shaft, a stirring blade is fixedly connected to the outer surface of the rotating shaft, a second cavity is opened inside the stirring blade, the second cavity is connected to the first cavity, a through hole is opened on the outer surface of the stirring blade, a protective tube is fixedly connected to the inner top of the reactor body, the air intake window is located inside the protective tube, a connecting tube is fixedly connected to the side wall of the protective tube, an air intake pipe is installed on the side wall of the reactor body, a first control valve is installed inside the air intake pipe, and a threaded tube is fixedly connected to one end of the air intake pipe, and the threaded tube is installed inside the connecting tube.

[0007] Optionally, an air guide plug is installed at the bottom of the rotating shaft, and a drainage hole is opened on the surface of the air guide plug, and the number of the drainage holes is multiple.

[0008] Optionally, a sealing ring is installed at the bottom of the protection tube, and the sealing ring is located between the protection tube and the rotating shaft.

[0009] Optionally, a feed port is provided on the top of the reactor body, and a feed baffle is movably connected inside the feed port, and the feed baffle is located on the side of the motor.

[0010] Optionally, a discharge pipe is fixedly connected to the bottom of the reactor body, and a second control valve is installed inside the discharge pipe.

[0011] Optionally, a bracket is fixedly connected to the lower surface of the reactor body, and the length of the bracket is greater than the length of the discharge pipe.

[0012] Optionally, a controller is fixedly connected to the front of the reactor body, and a display is provided on the front of the controller.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model is provided with a rotating shaft, a connecting pipe and an air inlet pipe. When in use, hydrogen is introduced through the air inlet pipe, the hydrogen will enter the connecting pipe, and enter the first cavity inside the rotating shaft through the air inlet window on the rotating shaft, and then transfer through the first cavity and be discharged through the through hole on the stirring blade, thereby realizing underwater hydrogenation during the production of p-aminophenol, which is beneficial to the production of p-aminophenol.

[0015] 2. The utility model is provided with an air guide plug. When in use, the bottom of the rotating shaft is blocked by the air guide plug, which can prevent hydrogen from entering the first cavity and then being discharged directly from the bottom of the rotating shaft, ensuring that the hydrogen is discharged through the through holes on the stirring blades, which is beneficial to the mixing reaction of hydrogen and the internal materials of the reactor. At the same time, the drainage hole on the air guide plug can discharge the liquid that has entered the interior of the rotating shaft, preventing the liquid from remaining inside the rotating shaft and affecting the subsequent reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

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

[0018] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the utility model;

[0019] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 4 For this utility model Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0021] In the figure: 1. reactor body; 2. motor; 3. rotating shaft; 4. first cavity; 5. air inlet window; 6. stirring blade; 7. second cavity; 8. through hole; 9. air guide plug; 10. drain hole; 11. protective tube; 12. sealing ring; 13. connecting tube; 14. air inlet pipe; 15. threaded tube; 16. feed baffle; 17. discharge pipe; 18. bracket; 19. controller. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] Reference Figure 1-4, a hydrogenation reaction device for the production of p-aminophenol provided by an embodiment of the utility model is now described. A hydrogenation reaction device for the production of p-aminophenol comprises a reactor body 1, a motor 2 is fixedly connected to the top of the reactor body 1, a rotating shaft 3 is fixedly connected to the output end of the motor 2, the motor 2 can drive the rotating shaft 3 to rotate when it works, the rotating shaft 3 is located inside the reactor body 1, a first cavity 4 is provided inside the rotating shaft 3, an air inlet window 5 is provided on the outer surface of the rotating shaft 3, hydrogen can enter the first cavity 4 through the air inlet window 5, a stirring blade 6 is fixedly connected to the outer surface of the rotating shaft 3, the rotation of the rotating shaft 3 can drive the stirring blade 6 to rotate, and then stir and mix the materials inside the reactor body 1, a second cavity 7 is provided inside the stirring blade 6, the second cavity 7 is connected to the first cavity 4, a through hole 8 is provided on the outer surface of the stirring blade 6, the hydrogen entering the first cavity 4 will be discharged through the through hole 8 on the stirring blade 6, thereby realizing underwater hydrogenation, which is beneficial to the reaction; the reactor body 1 A protection tube 11 is fixedly connected to the inner top, and the air intake window 5 is located inside the protection tube 11. The rotating shaft 3 can rotate inside the protection tube 11 without affecting the protection tube 11. A connecting pipe 13 is fixedly connected to the side wall of the protection tube 11. An air intake pipe 14 is installed on the side wall of the reactor body 1. A first control valve is installed inside the air intake pipe 14. The opening and closing of the air intake pipe 14 can be controlled by the first control valve, so as to facilitate the introduction of hydrogen into the reactor body 1; a threaded pipe 15 is fixedly connected to one end of the air intake pipe 14, and the threaded pipe 15 is installed inside the connecting pipe 13. Hydrogen is introduced through the air intake pipe 14, and the hydrogen will enter the connecting pipe 13 and enter the first cavity 4 inside the rotating shaft 3 through the air intake window 5 on the rotating shaft 3, and then transfer through the first cavity 4 and be discharged through the through hole 8 on the stirring blade 6, thereby realizing underwater hydrogenation during the production of p-aminophenol, which is beneficial to the production of p-aminophenol.

[0027] Compared with the prior art, the hydrogenation reaction device for producing p-aminophenol provided by the utility model can enter the first cavity 4 inside the rotating shaft 3 through the air inlet window 5, and then be discharged through the through hole 8 on the stirring blade 6, thereby realizing underwater hydrogenation during the production of aminophenol.

[0028] In another embodiment of the present invention, please refer to Figures 2 to 4 An air guide plug 9 is installed at the bottom of the rotating shaft 3. A drainage hole 10 is opened on the surface of the air guide plug 9, and the number of the drainage holes 10 is multiple. The air guide plug 9 can block the bottom of the rotating shaft 3 to prevent hydrogen from entering the first cavity 4 and then being directly discharged from the bottom of the rotating shaft 3, ensuring that the hydrogen is discharged through the through hole 8 of the stirring blade 6, which is beneficial to the mixing reaction of hydrogen and the internal materials of the reactor. At the same time, the liquid entering the interior of the rotating shaft 3 can be discharged through the drainage hole 10 on the air guide plug 9 to prevent the liquid from remaining in the interior of the rotating shaft 3 and affecting the subsequent reaction.

[0029] In another embodiment of the present invention, please refer to Figure 2 and Figure 3 A sealing ring 12 is installed at the bottom of the protection tube 11. The sealing ring 12 is located between the protection tube 11 and the rotating shaft 3. The sealing ring 12 is a dynamic sealing ring to reduce the leakage of hydrogen through the connection between the protection tube 11 and the rotating shaft 3.

[0030] In another embodiment of the present invention, please refer to Figure 1 and Figure 2 A feed port is provided at the top of the reactor body 1, and a feed baffle 16 is movably connected inside the feed port to facilitate adding materials into the reactor body 1. The feed baffle 16 is located on the side of the motor 2. A discharge pipe 17 is fixedly connected to the bottom of the reactor body 1. A second control valve is installed inside the discharge pipe 17 to facilitate discharging the reaction product. A bracket 18 is fixedly connected to the lower surface of the reactor body 1. The length of the bracket 18 is greater than the length of the discharge pipe 17, and it plays a role in supporting the reactor body 1.

[0031] In another embodiment of the present invention, please refer to Figure 1 and Figure 2 A controller 19 is fixedly connected to the front of the reactor body 1, and a display is provided on the front of the controller 19. The start and stop of the motor 2 can be controlled by the controller 19, which is convenient for the use of the utility model.

[0032] Working principle: When in use, hydrogen is introduced through the air inlet pipe 14, enters the connecting pipe 13 and enters the first cavity 4 inside the rotating shaft 3 through the air inlet window 5 on the rotating shaft 3, and then is transferred through the first cavity 4 and discharged through the through hole 8 on the stirring blade 6, thereby realizing underwater hydrogenation during the production of p-aminophenol, which is beneficial to the production of p-aminophenol.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogenation reaction device for producing p-aminophenol, comprising a reactor body (1), characterized in that: The top of the reactor body (1) is fixedly connected to a motor (2), the output end of the motor (2) is fixedly connected to a rotating shaft (3), the rotating shaft (3) is located inside the reactor body (1), a first cavity (4) is provided inside the rotating shaft (3), an air inlet window (5) is provided on the outer surface of the rotating shaft (3), a stirring blade (6) is fixedly connected to the outer surface of the rotating shaft (3), a second cavity (7) is provided inside the stirring blade (6), the second cavity (7) is connected to the first cavity (4), and the stirring blade ( 6) is provided with a through hole (8), the inner top of the reactor body (1) is fixedly connected to a protective tube (11), the air inlet window (5) is located inside the protective tube (11), the side wall of the protective tube (11) is fixedly connected to a connecting tube (13), the side wall of the reactor body (1) is installed with an air inlet pipe (14), a first control valve is installed inside the air inlet pipe (14), one end of the air inlet pipe (14) is fixedly connected to a threaded tube (15), and the threaded tube (15) is installed inside the connecting tube (13).

2. The hydrogenation reaction device for producing p-aminophenol as claimed in claim 1, characterized in that: An air guide plug (9) is installed at the bottom of the rotating shaft (3), and a liquid drainage hole (10) is opened on the surface of the air guide plug (9), and the number of the liquid drainage holes (10) is multiple.

3. The hydrogenation reaction device for producing p-aminophenol as claimed in claim 1, characterized in that: A sealing ring (12) is installed at the bottom of the protection tube (11), and the sealing ring (12) is located between the protection tube (11) and the rotating shaft (3).

4. The hydrogenation reaction device for producing p-aminophenol as claimed in claim 1, characterized in that: A feed inlet is provided on the top of the reactor body (1), and a feed baffle (16) is movably connected inside the feed inlet. The feed baffle (16) is located on the side of the motor (2).

5. The hydrogenation reaction device for producing p-aminophenol as claimed in claim 1, characterized in that: A discharge pipe (17) is fixedly connected to the bottom of the reactor body (1), and a second control valve is installed inside the discharge pipe (17).

6. The hydrogenation reaction device for producing p-aminophenol as claimed in claim 1, characterized in that: A bracket (18) is fixedly connected to the lower surface of the reactor body (1), and the length of the bracket (18) is greater than the length of the discharge pipe (17).

7. The hydrogenation reaction device for producing p-aminophenol as claimed in claim 1, characterized in that: A controller (19) is fixedly connected to the front of the reactor body (1), and a display is arranged on the front of the controller (19).

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