Sebacic acid precipitation device

Abstract

The utility model discloses a sebacic acid precipitation device which comprises a mixing tank, a water tank and a concentrated sulfuric acid tank, an inner tank is arranged in the mixing tank, one end of the inner tank is fixedly connected with a liquid outlet hole extending into the mixing tank, the water tank and the concentrated sulfuric acid tank are respectively and fixedly connected with a water guide pipe and an acid guide pipe, and the water guide pipe and the acid guide pipe are jointly provided with a mixing assembly. When the diluent in the water guide pipe and the concentrated sulfuric acid in the acid guide pipe are discharged into the inner tank, the diluent and the concentrated sulfuric acid are mixed and diluted. Through the arrangement of the mixing assembly, when liquid in the water tank and the concentrated sulfuric acid tank enters the liquid outlet pipe through the water guide pipe and the acid guide pipe, the two kinds of liquid flow downwards together, and the stirring blades are pushed to rotate in the process, so that the two kinds of liquid are mixed when being conveyed in the liquid outlet pipe; the diluted and mixed liquid enters the inner tank through the liquid outlet hole, and the subsequent steps in the prior art are not detailed any more.

Description

Technical Field

[0001] This utility model relates to the field of sebacic acid production technology, and in particular to a sebacic acid precipitation device. Background Technology

[0002] Sebacic acid is a white, flaky crystalline solid, slightly soluble in water but soluble in ethanol and ether. It is flammable and essentially non-toxic. Sebacic acid can be prepared from natural castor oil or adipic acid monoester, or through the polymerization reaction of ethylene and carbon tetrachloride. However, currently, global industrial production of sebacic acid almost entirely relies on castor oil. Under alkaline conditions, castor oil is hydrolyzed by heating, first producing sodium ricinoleate soap, which is then acidified with sulfuric acid to obtain ricinoleic acid. In the presence of the diluent cresol, alkali is added and heated to 260-280°C for pyrolysis, producing disodium sebacic acid, 2-octanol, and hydrogen. The pyrolysis products are diluted with water, heated, and neutralized with acid to convert the disodium salt to the monosodium salt. Then, the neutralized solution, decolorized with activated carbon, is boiled and acid is added to crystallize the monosodium sebacic acid. After separation and drying, the finished product is obtained.

[0003] Traditional preparation methods use concentrated sulfuric acid directly, but the reaction is too vigorous, easily causing droplet splashing and making it difficult to control the pH value of the solution. Existing technologies optimize these problems by diluting the sulfuric acid; however, in existing precipitation devices, if the addition of diluent and concentrated sulfuric acid is too fast, droplet splashing may still occur; if the addition is too slow, production efficiency will be affected. Therefore, this invention proposes a novel sebacic acid precipitation device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for the precipitation of sebacic acid.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sebacic acid precipitation device, comprising a mixing tank, a water tank, and a concentrated sulfuric acid tank, wherein an inner tank is provided inside the mixing tank, and a second pipe extending into the mixing tank is fixedly connected to one end of the inner tank; a water guide pipe and an acid guide pipe are fixedly connected to the water tank and the concentrated sulfuric acid tank, respectively; a mixing component is installed on the water guide pipe and the acid guide pipe together to mix and dilute the diluent in the water guide pipe and the concentrated sulfuric acid in the acid guide pipe when they are discharged into the inner tank.

[0006] As a further description of the above technical solution: the mixing component includes a liquid outlet pipe fixedly connected to the outer ends of the water pipe and the acid pipe. The peripheral sidewall and bottom wall of the liquid outlet pipe are provided with a plurality of liquid outlet holes. The inner tank is connected to the inside of the liquid outlet pipe through the plurality of liquid outlet holes.

[0007] As a further description of the above technical solution: a support rod is movably installed inside the liquid outlet pipe, a fixed ring is rotatably connected to the side wall of the support rod, and a plurality of stirring blades are fixedly connected to the side wall of the fixed ring. The plurality of stirring blades are arranged at equal intervals around the fixed ring, and the plurality of stirring blades are all inclined.

[0008] As a further description of the above technical solution: a conical head is fixedly connected to the bottom end of the liquid outlet pipe, a hollow groove is opened inside the conical head, the stirring plate and the support rod are inserted and matched, and a buffer is installed in the hollow groove, the buffer and the support rod are in contact.

[0009] As a further description of the above technical solution: the tilt angle of the stirring plate is respectively towards the connection between the water guide pipe and the liquid outlet pipe, and the connection between the acid guide pipe and the liquid outlet pipe. The water guide pipe, the acid guide pipe and the liquid outlet pipe are an integral structure. The liquid outlet pipe is connected to the water tank and the concentrated sulfuric acid tank through the water guide pipe and the acid guide pipe, respectively.

[0010] As a further description of the above technical solution:

[0011] This utility model has the following beneficial effects:

[0012] 1. Compared with existing technologies, this sebacic acid precipitation device, by setting up a mixing component, allows the liquids in the water tank and concentrated sulfuric acid tank to flow downwards together when they enter the outlet pipe through the water pipe and acid pipe, respectively. During this process, the stirring blades are rotated, causing the two liquids to mix while being transported in the outlet pipe. The diluted and mixed liquid is then discharged into the inner tank through the outlet hole. On the one hand, the simultaneous mixing while transporting liquid into the inner tank can improve production efficiency. On the other hand, the rotation and stirring of multiple stirring blades when the two liquids enter the outlet pipe can improve mixing efficiency. In addition, the outlet pipe is directly connected to the bottom of the inner tank, and the mixed liquid in the outlet pipe is discharged through several outlet holes. In this way, the liquid entering the inner pipe can be dispersed and discharged, thereby reducing the flow rate and velocity, reducing the problem of large amounts of liquid flowing down from a height causing impact and splashing of droplets, and thus facilitating subsequent mixing.

[0013] 2. Compared with the prior art, this sebacic acid precipitation device, by setting a conical head and a buffer, when the liquid in the water tank and concentrated sulfuric acid tank enters the liquid outlet pipe through the water pipe and acid pipe, if the liquid flow rate is too fast and impacts the stirring plate, the stirring plate drives the support rod to unload and buffer on the buffer, thereby reducing the impact; in addition, if there is less liquid in the inner tube, due to the shape of the conical head, the mixed liquid can gradually converge towards the tip through the conical surface of the conical head and drip down, thereby reducing the dripping area of ​​the droplets, and thus optimizing the problem of droplet splashing when there is little liquid. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a sebacic acid precipitation device proposed in this utility model;

[0015] Figure 2 This is a schematic diagram of the first cross-sectional structure of a sebacic acid precipitation device proposed in this utility model.

[0016] Figure 3 This is a second cross-sectional structural diagram of a sebacic acid precipitation device proposed in this utility model;

[0017] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0018] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0019] Figure 6 for Figure 5 Enlarged structural diagram at point C;

[0020] Figure 7 This is a schematic diagram of the stirring plate structure of a sebacic acid precipitation device proposed in this utility model;

[0021] Figure 8 This is a schematic diagram of the cross-sectional structure of the water pipe and the acid pipe.

[0022] Legend:

[0023] 1. Mixing tank; 2. Water tank; 3. Concentrated sulfuric acid tank; 4. Water pipe; 5. Acid pipe; 6. Inner tank; 7. Discharge pipe; 8. Discharge hole; 9. Support rod; 10. Fixing ring; 11. Stirring blade; 12. Conical head; 13. Hollow trough; 14. Buffer component. Detailed Implementation

[0024] The technical solutions of the present 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 the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figures 1-8This utility model provides a precipitation device for sebacic acid, comprising a mixing tank 1, a water tank 2, and a concentrated sulfuric acid tank 3. The mixing tank 1 is equipped with an inner tank 6. The precipitation device is prior art and its entire structure is not shown, so it will not be described in detail. One end of the inner tank 6 is fixedly connected to an outlet hole 8 that extends into the mixing tank 1. The water tank 2 and the concentrated sulfuric acid tank 3 are respectively fixedly connected to a water guide pipe 4 and an acid guide pipe 5. A mixing component is installed on both the water guide pipe 4 and the acid guide pipe 5 to mix and dilute the diluted solution in the water guide pipe 4 and the concentrated sulfuric acid in the acid guide pipe 5 when they are discharged into the inner tank 6.

[0026] The mixing assembly includes an outlet pipe 7 fixedly connected to the outer ends of the water pipe 4 and the acid pipe 5. Several second pipes 15 are provided on the periphery and bottom wall of the outlet pipe 7. The inner tank 6 is connected to the outlet pipe 7 via several outlet holes 8. The water pipe 4, the acid pipe 5, and the outlet pipe 7 are an integral structure. The outlet pipe 7 is connected to the water tank 2 and the concentrated sulfuric acid tank 3 via the water pipe 4 and the acid pipe 5, respectively. A support rod 9 is movably installed inside the outlet pipe 7. A fixing ring 10 is rotatably connected to the periphery of the support rod 9. Several stirring blades 11 are fixedly connected to the periphery of the fixing ring 10. The stirring blades 11 are equidistantly arranged around the fixing ring 10, and all stirring blades 11 are inclined. By setting up the mixing assembly, when the liquids in the water tank 2 and the concentrated sulfuric acid tank 3 enter the outlet pipe 7 through the water pipe 4 and the acid pipe 5, the two liquids flow downwards together, pushing the water and concentrated sulfuric acid tank 3 in the process. The rotation of the stirring blades 11 mixes the two liquids as they are transported in the outlet pipe 7. The diluted and mixed liquid is then discharged into the inner tank 6 through the outlet hole 8. Subsequent steps are existing technology and will not be described in detail here. On the one hand, mixing the liquids while they are being transported into the inner tank 6 can improve production efficiency. On the other hand, the rotation of multiple stirring blades 11 when the two liquids enter the outlet pipe 7 can improve mixing efficiency. In addition, the outlet pipe 7 is directly connected to the bottom of the inner tank 6, and the mixed liquid in the outlet pipe 7 is discharged through several outlet holes 8. This allows the liquid entering the inner pipe 6 to be discharged in a dispersed manner, thereby reducing the flow rate and velocity and reducing the problem of large amounts of liquid flowing down from a height causing impact and splashing of droplets, which is beneficial for subsequent mixing. Furthermore, a mixing component is also provided in the second pipe 15, allowing the mixed liquid entering the mixing tank 1 in the inner tank 6 to be processed.

[0027] A conical head 12 is fixedly connected to the bottom of the outlet pipe 7. A hollow groove 13 is opened inside the conical head 12. The stirring plate 11 and the support rod 9 are inserted and matched. A buffer 14 is installed in the hollow groove 13. The buffer 14 and the support rod 9 are in contact. The buffer 14 is a structure such as a buffer pad or spring in the prior art. By setting the conical head 12 and the buffer 14, when the liquid in the water tank 2 and the concentrated sulfuric acid tank 3 enters the outlet pipe 7 through the water pipe 4 and the acid pipe 5, if the liquid flow rate is too fast and impacts the stirring plate 11, the stirring plate 11 drives the support rod 9 to unload and buffer on the buffer 14, thereby reducing the impact. In addition, if there is less liquid in the inner pipe 6, due to the shape of the conical head 12, the mixed liquid can gradually converge towards the tip through the conical surface of the conical head 12 and drip down, thereby reducing the dripping area of ​​the droplets and optimizing the problem of droplet splashing when there is little liquid.

[0028] The tilt angles of the stirring plate 11 are respectively directed towards the connection points of the water guide pipe 4 and the liquid outlet pipe 7, and the connection points of the acid guide pipe 5 and the liquid outlet pipe 7. By setting the tilt angles of the stirring plate 11 to be directed towards the connection points of the water guide pipe 4 and the liquid outlet pipe 7, when the liquids in the water tank 2 and the concentrated sulfuric acid tank 3 enter the liquid outlet pipe 7 through the water guide pipe 4 and the acid guide pipe 5, the flow of the two liquids together pushes the stirring plate 11 to rotate.

[0029] Working principle: When in use, the liquids in the water tank 2 and the concentrated sulfuric acid tank 3 enter the outlet pipe 7 through the water pipe 4 and the acid pipe 5. The two liquids flow downward together, which drives the rotation of the stirring blade 11, so that the two liquids are mixed when transported in the outlet pipe 7. The diluted and mixed liquid enters the inner tank 6 through the outlet hole 8. The subsequent steps are existing technology and will not be described in detail here.

[0030] By setting the conical head 12 and the buffer 14, when the liquid in the water tank 2 and the concentrated sulfuric acid tank 3 enters the liquid outlet pipe 7 through the water guide pipe 4 and the acid guide pipe 5, if the liquid flow rate is too fast and impacts the stirring plate 11, the stirring plate 11 drives the support rod 9 to unload and buffer on the buffer 14, thereby reducing the impact.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for the precipitation of sebacic acid, comprising a mixing tank (1), a water tank (2), and a concentrated sulfuric acid tank (3), characterized in that: The mixing tank (1) is equipped with an inner tank (6). One end of the inner tank (6) is fixedly connected to a second pipe (15) that extends into the mixing tank (1). The water tank (2) and the concentrated sulfuric acid tank (3) are respectively fixedly connected to a water pipe (4) and an acid pipe (5). A mixing assembly is installed on the water pipe (4) and the acid pipe (5) to mix and dilute the diluent in the water pipe (4) and the concentrated sulfuric acid in the acid pipe (5) when they are discharged into the inner tank (6).

2. The device for precipitating sebacic acid according to claim 1, characterized in that: The mixing assembly includes a liquid outlet pipe (7) fixedly connected to the outer ends of the water pipe (4) and the acid pipe (5). The liquid outlet pipe (7) has several liquid outlet holes (8) on its periphery and bottom wall. The inner tank (6) is connected to the inside of the liquid outlet pipe (7) through several of the liquid outlet holes (8).

3. The device for precipitating sebacic acid according to claim 2, characterized in that: A support rod (9) is movably installed inside the liquid outlet pipe (7). A fixed ring (10) is rotatably connected to the side wall of the support rod (9). A plurality of stirring blades (11) are fixedly connected to the side wall of the fixed ring (10). The plurality of stirring blades (11) are arranged at equal intervals with the fixed ring (10) as the center, and the plurality of stirring blades (11) are all inclined.

4. The device for precipitating sebacic acid according to claim 3, characterized in that: The bottom end of the liquid outlet pipe (7) is fixedly connected to an integral conical head (12). A hollow groove (13) is provided inside the conical head (12). The stirring plate (11) and the support rod (9) are inserted and matched. A buffer (14) is installed inside the hollow groove (13). The buffer (14) and the support rod (9) are in contact with each other.

5. The device for precipitating sebacic acid according to claim 4, characterized in that: The tilt angles of the stirring plate (11) are respectively towards the connection between the water pipe (4) and the liquid outlet pipe (7), and the connection between the acid pipe (5) and the liquid outlet pipe (7).

6. The device for precipitating sebacic acid according to claim 4, characterized in that: The water pipe (4), the acid pipe (5), and the liquid outlet pipe (7) are an integral structure. The liquid outlet pipe (7) is connected to the water tank (2) and the concentrated sulfuric acid tank (3) through the water pipe (4) and the acid pipe (5), respectively.

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