Mixing and stirring device for preparing azelaic acid

Abstract

The utility model discloses a mixing and stirring device for preparing azelaic acid, which is characterized in that a kettle cover is arranged at the top end of a kettle body, a plurality of feed ports and an ozone inlet interface are also arranged on the upper surface of the kettle cover, a jacket is wrapped on the periphery of the kettle body, a support is arranged at the bottom end in the kettle body and is positioned at a discharge port, and a main shaft is provided with a plurality of stirring paddles; the main shaft and the stirring paddle are rotationally arranged in the kettle body, the connecting pipe is arranged on the inner wall of the kettle body through a connecting piece, the annular stainless steel pipe is coaxial with the support and welded to the bottom end in the kettle body, air outlet holes are densely distributed in the lower surface of the annular stainless steel pipe, and the inner side of the annular stainless steel pipe is connected with the outer wall of the support through a plurality of connecting rods; the reaction kettle disclosed by the utility model is reasonable in structure, ozone is uniformly discharged into the kettle body through the annular stainless steel pipe and is in contact reaction with a stirred mixed solution, and the ozonization efficiency and effect are greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of mixing and stirring equipment for the preparation of azelaic acid, specifically a mixing and stirring device for the preparation of azelaic acid. Background Technology

[0002] Azelaic acid is a medium- to long-chain aliphatic dicarboxylic acid containing seven normal saturated carbon atoms. It exists in both α and β crystal forms and is widely used in the production of dimethyl azelaate plasticizers, fragrances, lubricants, artificial leather, alkyd resins, paints, and other products. Currently, azelaic acid production mainly uses oleic acid and strong oxidizing agents as raw materials. Depending on the type of oxidizing agent, it can be produced using methods such as the ozone method, peroxide method, potassium permanganate method, nitric acid method, and hypochlorite method. The process of preparing azelaic acid from oleic acid involves mixing oleic acid and a solvent using a mixing and stirring device, followed by odor treatment with odorous gas. The odorized products are then subjected to an oxidative cracking reaction to obtain crude azelaic acid.

[0003] Currently, in the mixing and stirring devices used for the preparation of azelaic acid, the odor is generally directly inserted into the bottom of the reactor through a pipe. The odor is injected into the reactor and reacts with the mixed solution to produce ozone. However, this structure prevents the odor from reacting evenly with the mixed solution, thus affecting the reaction effect. Therefore, an improved technology is urgently needed to solve this problem in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a mixing and stirring device for the preparation of azelaic acid, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mixing and stirring device for the preparation of azelaic acid, comprising a vessel body, a stirring mechanism, and an ozone inlet pipe;

[0006] The top of the vessel body is provided with a vessel cover, and a motor base is provided at the center of the upper surface of the vessel cover. The upper surface of the vessel cover is also provided with several feed inlets and an ozone inlet. The vessel body is surrounded by a jacket, and a discharge port is provided at the bottom of the vessel body. A support is provided at the bottom of the vessel body and at the discharge port. Several through slots are opened at the lower part of the support, and a shaft seat is provided at the center of the upper surface of the support.

[0007] The stirring mechanism includes a motor, a main shaft, and stirring paddles. The motor is mounted on the upper surface of the motor base, and the main shaft is equipped with several stirring paddles. Both the main shaft and the stirring paddles are rotatably mounted inside the vessel. The top end of the main shaft is connected to the output shaft of the motor via a coupling, and the bottom end of the main shaft is rotatably engaged with the shaft seat.

[0008] The ozone inlet pipeline includes a connecting pipe and an annular stainless steel pipe. The connecting pipe is installed on the inner wall of the vessel via a connector. The annular stainless steel pipe is coaxial with the support and welded to the bottom of the vessel. The lower surface of the annular stainless steel pipe is densely covered with air outlet holes. The inner side of the annular stainless steel pipe is connected to the outer wall of the support via several connecting rods. A connection port is provided at one end of the annular stainless steel pipe near the connecting pipe. The bottom of the connecting pipe is connected to the connection port, and the top of the connecting pipe is connected to the ozone inlet interface.

[0009] Preferably, the present invention provides a mixing and stirring device for the preparation of azelaic acid, wherein an extension sleeve is provided on the lower surface of the kettle cover and at the ozone inlet, and the extension sleeve is inserted into the top end of the connecting pipe.

[0010] Preferably, the present invention provides a mixing and stirring device for the preparation of azelaic acid, wherein a thermometer port, a pressure gauge port and an exhaust port are provided on the upper surface of the vessel lid, and a manhole is provided on the upper surface of the vessel lid near the ozone inlet.

[0011] Preferably, the mixing and stirring device for preparing azelaic acid provided by this utility model has a heat exchange gas inlet at the bottom of the jacket and a heat exchange gas outlet on one side of the upper part of the jacket.

[0012] Preferably, the mixing and stirring device for preparing azelaic acid provided by this utility model includes several support seats around the jacket.

[0013] Preferably, in the mixing and stirring device for preparing azelaic acid provided by this utility model, the height of the top of the slot of the support is lower than the height of the connecting rod.

[0014] Preferably, the present invention provides a mixing and stirring device for the preparation of azelaic acid, wherein an annular baffle is provided on the upper surface of the annular stainless steel tube, the outer periphery of the annular baffle is welded to the inner wall of the reactor, and the connection port is provided through the annular baffle.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] An annular stainless steel tube is coaxially installed at the bottom of the vessel body. A connecting pipe is installed on the inner wall of the vessel body through a connector. The two ends of the connecting pipe are connected to the connection port of the annular stainless steel tube and the extension sleeve of the ozone inlet, respectively. Ozone is evenly discharged into the vessel body through the annular stainless steel tube and reacts with the stirred mixture, which greatly improves the efficiency and effect of ozonation. In addition, the annular stainless steel tube is connected to the support through several connecting rods, which greatly improves the stability of the annular stainless steel tube and the support, thereby ensuring the stability of the main shaft and the stirring paddle when rotating. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the cross-sectional structure of the present invention;

[0018] Figure 2 For the appendix Figure 1 Enlarged structural diagram of point A in the middle;

[0019] Figure 3 This is a top view of the structure of the present invention located at the annular stainless steel tube;

[0020] Figure 4 This is a schematic diagram of the appearance and structure of this utility model.

[0021] In the diagram: 1. Vessel body; 2. Vessel cover; 3. Motor base; 4. Feed inlet; 5. Ozone inlet port; 6. Jacket; 7. Discharge port; 8. Support; 9. Through groove; 10. Shaft seat; 11. Motor; 12. Main shaft; 13. Agitator; 14. Connecting pipe; 15. Annular stainless steel pipe; 16. Connecting rod; 17. Gas outlet; 18. Connecting port; 19. Thermometer port; 20. Pressure gauge port; 21. Exhaust port; 22. Manhole; 23. Extension sleeve; 24. Heat exchange gas inlet; 25. Heat exchange gas outlet; 26. Support base; 27. Annular baffle. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution: a mixing and stirring device for the preparation of azelaic acid, including a vessel body 1, a stirring mechanism and an ozone inlet pipe;

[0025] The vessel body 1 has a lid 2 at its top. A motor base 3 is located at the center of the upper surface of the lid 2. The upper surface of the lid 2 also has several feed inlets 4 and an ozone inlet 5. An extension sleeve 23 is located on the lower surface of the lid 2, near the ozone inlet 5. The extension sleeve 23 is inserted into the top of a connecting pipe 14 to connect the extension sleeve 23 to the connecting pipe 14. The upper surface of the lid 2 has a thermometer port 19, a pressure gauge port 20, and an exhaust port 21 to facilitate the connection and installation of the thermometer, pressure gauge, and external exhaust pipe, respectively. A manhole 22 is located on the upper surface of the lid 2, near the ozone inlet 5, for convenient... When installing the vessel cover 2, the top end of the connecting pipe 14 is connected to the extension sleeve 23. The vessel body 1 is wrapped with a jacket 6. The bottom of the jacket 6 is provided with a heat exchange gas inlet 24, and the upper side of the jacket 6 is provided with a heat exchange gas outlet 25, so as to realize the entry and exit of high temperature steam relative to the jacket 6. Several support seats 26 are also provided around the jacket 6. The vessel body 1 is installed and fixed on the platform through the support seats 26. The bottom of the vessel body 1 is provided with a discharge port 7. The bottom of the vessel body 1 and the discharge port 7 are provided with a support 8. Several through grooves 9 are opened at the bottom of the support 8. The center of the upper surface of the support 8 is provided with a shaft seat 10.

[0026] The stirring mechanism includes a motor 11, a main shaft 12 and stirring paddles 13. The motor 11 is mounted on the upper surface of the motor base 3. The main shaft 12 is equipped with several stirring paddles 13. The main shaft 12 and the stirring paddles 13 are rotatably mounted inside the vessel body 1. The top end of the main shaft 12 is connected to the output shaft of the motor 11 through a coupling. The bottom end of the main shaft 12 is rotatably engaged with the shaft seat 10.

[0027] The ozone inlet pipeline includes a connecting pipe 14 and an annular stainless steel pipe 15. The connecting pipe 14 is installed on the inner wall of the vessel body 1 through a connector. The annular stainless steel pipe 15 is coaxial with the support 8 and welded to the bottom of the vessel body 1. The lower surface of the annular stainless steel pipe 15 is densely covered with air outlet holes 17. The inner side of the annular stainless steel pipe 15 is connected to the outer wall of the support 8 through several connecting rods 16. The height of the top of the slot 9 opened in the support 8 is lower than the height of the connecting rods 16 to ensure that the connecting rods 16 can be smoothly connected to the outer wall of the support 8. The annular stainless steel pipe 15 is provided with a connection port 18 at one end near the connecting pipe 14. The bottom of the connecting pipe 14 is connected to the connection port 18, and the top of the connecting pipe 14 is connected to the ozone inlet interface 5. An annular baffle 27 is provided on the upper surface of the annular stainless steel pipe 15. The outer periphery of the annular baffle 27 is welded to the inner wall of the vessel body 1. The connection port 18 passes through the annular baffle 27 and is welded at the connection point. The annular baffle 27 facilitates the accumulation of some solution between the annular stainless steel pipe 15 and the vessel body 1.

[0028] Installation method and operating principle: First, weld the support 8 to the discharge port 7 at the bottom of the vessel body 1. Then, coaxially weld the annular stainless steel tube 15 to the support 8 and to the bottom of the vessel body 1. Next, weld several connecting rods 16 between the inner wall of the annular stainless steel tube 15 and the support 8. Finally, install the connecting pipe 14 on the inner wall of the vessel body 1 using connectors and bolts, and connect the bottom of the connecting pipe 14 to the connection port 18 of the annular stainless steel tube 15. Install the motor 11 on the lower surface of the motor base 3. Connect the top end of the main shaft 12 with the stirring paddle 13 to the output shaft of the motor 11 through a coupling. After lifting the vessel cover 2 with a crane, insert the main shaft 12 into the vessel body 1, so that the bottom of the main shaft 12 is inserted into the shaft seat 10 on the upper surface of the support 8, and connect the top end of the connecting pipe 14 to the extension sleeve 23 on the lower surface of the vessel cover 2. At the same time, connect the vessel cover 2 to the vessel body 1 with bolts to complete the installation. In use, the ozone pipeline is connected to the ozone inlet port 5. Oleic acid and solvent are added into the reactor body 1 through the feed port 4. Boiler steam enters the jacket 6 from the heat exchange gas inlet 24 and heats the reactor body 1. The motor 11 is started, which drives the main shaft 12 to rotate, thereby driving the agitator 13 to rotate, thus mixing and stirring the oleic acid and solvent. At the same time, ozone gas is sent in from the ozone inlet port 5. The ozone gas enters the annular stainless steel pipe 15 through the connecting pipe 14, and enters the reactor body 1 through the various gas outlets 17 on the lower surface of the annular stainless steel pipe 15. It reacts and contacts the mixed solution, causing the reaction solution to be ozonated. The ozonated solution is discharged from the discharge port 7 and enters the oxidative cracking reactor to obtain a mixture including azelaic acid and nonanoic acid. This utility model has a reasonable structure. An annular stainless steel tube 15 is coaxially arranged at the bottom of the vessel body 1. A connecting pipe 14 is provided on the inner wall of the vessel body 1 through a connector. The two ends of the connecting pipe 14 are respectively connected to the connection port 18 of the annular stainless steel tube 15 and the extension sleeve 23 of the ozone inlet port 5. Ozone is evenly discharged into the vessel body 1 through the annular stainless steel tube 15 and reacts with the stirred mixture, which greatly improves the efficiency and effect of ozone oxidation. In addition, the annular stainless steel tube is connected to the support 8 through several connecting rods 16, which greatly improves the stability of the annular stainless steel tube 15 and the support 8, thereby ensuring the stability of the main shaft 12 and the stirring paddle 13 when rotating.

[0029] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0030] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A mixing and stirring apparatus for the preparation of azelaic acid, characterized in that: Includes the vessel body (1), the stirring mechanism, and the ozone inlet pipeline; The top of the vessel body (1) is provided with a vessel cover (2), and a motor base (3) is provided at the center of the upper surface of the vessel cover (2). The upper surface of the vessel cover (2) is also provided with several feed inlets (4) and an ozone inlet (5). The vessel body (1) is surrounded by a jacket (6). The bottom of the vessel body (1) is provided with a discharge port (7). The bottom of the vessel body (1) and located at the discharge port (7) is provided with a support (8). The lower part of the support (8) is provided with several through slots (9). The center of the upper surface of the support (8) is provided with a shaft seat (10). The stirring mechanism includes a motor (11), a main shaft (12) and stirring paddles (13). The motor (11) is mounted on the upper surface of the motor base (3). The main shaft (12) is provided with a plurality of stirring paddles (13). The main shaft (12) and the stirring paddles (13) are rotatably mounted inside the vessel body (1). The top end of the main shaft (12) is connected to the output shaft of the motor (11) through a coupling. The bottom end of the main shaft (12) is rotatably engaged with the shaft seat (10). The ozone inlet pipeline includes a connecting pipe (14) and an annular stainless steel pipe (15). The connecting pipe (14) is installed on the inner wall of the vessel body (1) through a connector. The annular stainless steel pipe (15) is coaxial with the support (8) and welded to the bottom of the vessel body (1). The lower surface of the annular stainless steel pipe (15) is densely covered with air outlet holes (17). The inner side of the annular stainless steel pipe (15) is connected to the outer wall of the support (8) through several connecting rods (16). The annular stainless steel pipe (15) has a connection port (18) near the end of the connecting pipe (14). The bottom of the connecting pipe (14) is connected to the connection port (18). The top of the connecting pipe (14) is connected to the ozone inlet interface (5).

2. The mixing and stirring apparatus for preparing azelaic acid according to claim 1, characterized in that: An extension sleeve (23) is provided on the lower surface of the vessel lid (2) and at the ozone inlet (5), and the extension sleeve (23) is inserted into the top of the connecting pipe (14).

3. The mixing and stirring apparatus for preparing azelaic acid according to claim 1, characterized in that: The upper surface of the vessel lid (2) is provided with a thermometer port (19), a pressure gauge port (20) and an exhaust port (21), and a manhole (22) is provided on the upper surface of the vessel lid (2) and at the end near the ozone inlet port (5).

4. The mixing and stirring apparatus for preparing azelaic acid according to claim 1, characterized in that: The jacket (6) is provided with a heat exchange gas inlet (24) at the bottom and a heat exchange gas outlet (25) on one side of the upper part of the jacket (6).

5. The mixing and stirring apparatus for preparing azelaic acid according to claim 1, characterized in that: The jacket (6) is also provided with several support seats (26) around its periphery.

6. The mixing and stirring apparatus for preparing azelaic acid according to claim 1, characterized in that: The height of the top of the slot (9) of the support (8) is lower than the height of the connecting rod (16).

7. The mixing and stirring apparatus for preparing azelaic acid according to claim 1, characterized in that: An annular baffle (27) is provided on the upper surface of the annular stainless steel tube (15). The outer periphery of the annular baffle (27) is welded to the inner wall of the vessel body (1). The connection port (18) passes through the annular baffle (27).

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