A feeding device capable of improving the reaction yield of 2-bromobenzofuran

Abstract

The utility model belongs to production equipment technical field especially relates to a kind of feeding device that can improve 2-bromobenzofuran reaction yield.The utility model provides a kind of feeding device that can improve 2-bromobenzofuran reaction yield to the problem that local concentration is too large and leads to obvious side reaction in the feeding process in prior art, including feeding main body and the cover body being set in feeding main body upper, the feeding main body and cover body enclose and form feeding cavity, the cover body upper end is equipped with the feeding pipe being linked with feeding cavity, at least two discharge pipes are further equipped in the feeding main body, and the discharge port of different discharge pipes is different from the axial distance of feeding main body, further including the pipe switching assembly being set in feeding main body.The utility model utilizes different discharge pipes to discharge and can realize that material is added to different sites, to avoid the problem that local concentration is too large and leads to obvious side reaction, such as excessive bromination, due to fixed feeding site.

Description

Technical Field

[0001] This utility model belongs to the field of production equipment technology, and in particular relates to a crystallizing dish for the crystallization of m-bromobenzoic acid. Background Technology

[0002] 2-Bromobenzofuran, CAS No. 54008-77-4, is a benzofuran-type organic compound with the molecular formula C8H5BrO and a molecular weight of 197.03. It is commonly used in organic synthesis and pharmaceutical research. In existing technologies, the synthesis of 2-bromobenzofuran typically involves bromination of benzofuran with a brominating reagent. However, due to the high reactivity of both benzofuran and the brominating reagent, side reactions such as over-bromination can easily occur during the feeding process due to excessively high local concentrations. This is especially problematic in large-scale production, where the large quantity of materials makes timely and uniform mixing via stirring impossible, leading to significant over-bromination and other side reactions, ultimately reducing the yield of 2-bromobenzofuran.

[0003] For example, a Chinese utility model patent discloses a liquid material overfeeding device for insulating varnish production [Application No.: 201320636565.X]. This utility model patent includes a feeding box with a feeding port at the top. A liquid outlet pipe and a liquid outlet valve are located on the bottom side of the feeding box. The feeding port is trapezoidal, with the top wider than the bottom, and a sealing gasket is placed inside the feeding port. It also includes a feeding pipe that can be inserted into the feeding box. The upper end of the feeding pipe is connected to a conveying hose, and a trapezoidal sealing ring that mates with the feeding port is fixed on the outer wall of the feeding pipe. A sloping baffle is provided at the bottom of the feeding box.

[0004] This utility model patent has the advantages of simple structure and convenient operation, and sealing can be achieved by inserting the feeding tube into the feeding port of the feeding box, but it still does not solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a feeding device that can improve the reaction yield of 2-bromobenzofuran.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A feeding device for improving the reaction yield of 2-bromobenzofuran includes a feeding body and a cover disposed above the feeding body. The feeding body and the cover together form a feeding cavity. The upper end of the cover is provided with a feeding pipe communicating with the feeding cavity. The feeding body is also provided with at least two discharge pipes. The discharge ports of the different discharge pipes are at different distances from the axis of the feeding body. The device also includes a pipe switching component disposed within the feeding body. Rotating the pipe switching component can connect the feeding cavity with different discharge pipes.

[0007] The feeding device described above, which can improve the reaction yield of 2-bromobenzofuran, also includes a stepper motor, which is driven and connected to the pipeline switching assembly via a drive shaft.

[0008] In the above-mentioned feeding device for improving the reaction yield of 2-bromobenzofuran, there are three discharge pipes, namely a first discharge pipe, a second discharge pipe, and a third discharge pipe. The lower end of the first discharge pipe is connected to the first discharge port, the lower end of the second discharge pipe is connected to the second discharge port, and the lower end of the third discharge pipe is connected to the third discharge port. The distance between the third discharge port and the centerline of the feeding body is greater than the distance between the second discharge port and the centerline of the feeding body, which is greater than the distance between the first discharge port and the centerline of the feeding body.

[0009] In the above-mentioned feeding device for improving the reaction yield of 2-bromobenzofuran, the bottom of the feeding cavity is provided with a third discharge port and a second discharge port. The upper end of the third discharge pipe is connected to the feeding cavity through the third discharge port, and the upper end of the second discharge pipe is connected to the feeding cavity through the second discharge port. Rotating the pipe switching component can cause the pipe switching component to block the third discharge port and / or the second discharge port.

[0010] In the above-mentioned feeding device that can improve the reaction yield of 2-bromobenzofuran, there are several third and second feeding ports, and the third and second feeding ports are arranged alternately.

[0011] In the above-mentioned feeding device that can improve the reaction yield of 2-bromobenzofuran, the second discharge pipeline extends vertically and is connected to the second discharge port located at the bottom of the feeding body.

[0012] In the above-mentioned feeding device for improving the reaction yield of 2-bromobenzofuran, a section of the third discharge pipe away from the third discharge port extends in an inclined direction and is connected to the third discharge port located on the side of the feeding body.

[0013] In the above-mentioned feeding device for improving the reaction yield of 2-bromobenzofuran, the pipeline switching assembly includes an inner pipe and an outer pipe fixedly connected. A first through groove is provided at the corresponding position of the inner pipe and the outer pipe. The first discharge pipeline is located inside the inner pipe and is connected to the first through groove. The first discharge port is located at the bottom of the inner pipe. A pipe fitting protruding from the bottom surface of the feeding cavity is also fixedly provided on the feeding body. One end of the pipe fitting extends between the inner pipe and the outer pipe. A second through groove is provided on the side of the pipe fitting. Rotating the outer pipe can make the first through groove and the second through groove align with each other or stagger each other.

[0014] In the above-mentioned feeding device that can improve the reaction yield of 2-bromobenzofuran, a number of wing plates are fixedly connected to the side of the outer tube. The lower surface of the wing plates is in contact with the bottom surface of the feeding cavity. Rotating the outer tube can make the outer tube cover the third discharge port and / or the second discharge port.

[0015] In the above-mentioned feeding device that can improve the reaction yield of 2-bromobenzofuran, the wing plate is provided with several pieces and is evenly distributed circumferentially along the axis of the outer tube.

[0016] Compared with existing technologies, the advantages of this utility model are: 1. This utility model is equipped with different discharge pipelines, and the distance between the discharge port of the different discharge pipelines and the axis of the feeding body is different. That is, by using the pipeline switching component to switch different discharge pipelines for discharge, the material can be added to different sites, thereby avoiding the problems of excessive local concentration and excessive bromination and other side reactions caused by fixed feeding sites.

[0017] 2. This utility model has a simple structure, is easy to use, and is suitable for large-scale promotion and use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural diagram showing the material being discharged through the first discharge pipe; Figure 3 This is an exploded view of this utility model; Figure 4 This is a schematic diagram of the structure when material is discharged through the second discharge pipe; Figure 5 This is a schematic diagram of the structure when material is discharged through the third discharge pipe; Figure 6 This is a cross-sectional view of a portion of the structure of this utility model; In the diagram: 1. Feeding body; 2. Cover; 3. Feeding cavity; 4. Feeding pipe; 5. Pipeline switching assembly; 6. Stepper motor; 7. Drive shaft; 8. Pipe; 9. Second through groove; 51. Inner pipe; 52. Outer pipe; 53. First through groove; 54. Wing plate; 100. First discharge pipe; 101. Second discharge pipe; 200. Second discharge port; 201. Second discharge port; 202. Third discharge pipe; 300. Third discharge port; 301. Third discharge port; 302. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Combination Figure 1-3As shown, a feeding device for improving the reaction yield of 2-bromobenzofuran includes a feeding body 1 and a cover 2 disposed above the feeding body 1. The feeding body 1 and the cover 2 enclose a feeding cavity 3. The upper end of the cover 2 is provided with a feeding pipe 4 that communicates with the feeding cavity 3. The feeding body 1 is also provided with at least two discharge pipes. The discharge ports of different discharge pipes are at different distances from the axis of the feeding body 1. The device also includes a pipe switching component 5 disposed in the feeding body 1. Rotating the pipe switching component 5 can connect the feeding cavity 3 with different discharge pipes.

[0021] In this invention, the feeding device is installed at the top of the reactor. One of the reactants is contained within the reactor. The other reactant is fed into the feeding cavity 3 via the feeding pipe 4. The pipe switching assembly 5 rotates, allowing the feeding cavity 3 to circulate and connect with different discharge pipes. This allows the other reactant to be added to different locations within the reactor via different discharge pipes. Therefore, this invention features different discharge pipes with varying distances between their outlets and the axis of the feeding body 1. By using the pipe switching assembly 5 to switch between different discharge pipes, materials can be added to different locations, thus avoiding problems such as excessive local concentrations and over-bromination caused by a fixed feeding location.

[0022] like Figure 1 As shown, it also includes a stepper motor 6, which is connected to the pipeline switching assembly 5 via a drive shaft 7. The stepper motor 6 is used to drive the pipeline switching assembly 5 to rotate, and the selection of a stepper motor ensures that the rotation speed of the pipeline switching assembly 5 is controllable.

[0023] Combination Figure 4-6 As shown, the discharge pipeline has three sections: a first discharge pipeline 100, a second discharge pipeline 200, and a third discharge pipeline 300. The lower end of the first discharge pipeline 100 is connected to the first discharge port 101, the lower end of the second discharge pipeline 200 is connected to the second discharge port 201, and the lower end of the third discharge pipeline 300 is connected to the third discharge port 301. The distance between the third discharge port 301 and the centerline of the feeding body 1 is greater than the distance between the second discharge port 201 and the centerline of the feeding body 1, which is also greater than the distance between the first discharge port 101 and the centerline of the feeding body 1. (Combined with...) Figure 6 As can be seen, the discharge point of the first discharge pipe 100 is close to the center of the feeding device, the discharge point of the second discharge pipe 200 is close to the edge of the feeding device, and the discharge point of the third discharge pipe 300 extends beyond the boundary directly below the feeding device. That is, the reactants can be fed at different points through the first discharge pipe 100, the second discharge pipe 200, and the third discharge pipe 300.

[0024] Specifically, the bottom of the feeding cavity 3 is provided with a third discharge port 302 and a second discharge port 202. The upper end of the third discharge pipe 300 is connected to the feeding cavity 3 through the third discharge port 302, and the upper end of the second discharge pipe 200 is connected to the feeding cavity 3 through the second discharge port 202. Rotating the pipe switching component 5 can cause the pipe switching component 5 to cover the third discharge port 302 and / or the second discharge port 202. The pipeline switching assembly 5 includes an inner pipe 51 and an outer pipe 52 fixedly connected. A first through groove 53 is provided at corresponding positions on both the inner pipe 51 and the outer pipe 52. The first discharge pipe 100 is located inside the inner pipe 51 and communicates with the first through groove 53. The first discharge port 101 is located at the bottom of the inner pipe 51. A pipe fitting 8 protruding from the bottom surface of the feeding cavity 3 is also fixedly provided on the feeding body 1. One end of the pipe fitting 8 extends between the inner pipe 51 and the outer pipe 52. A second through groove 9 is provided on the side of the pipe fitting 8. Rotating the outer pipe 52 allows the first through groove 53 to align with or offset from the second through groove 9. Several wing plates 54 are also fixedly connected to the side of the outer pipe 52. The lower surface of the wing plates 54 is in contact with the bottom surface of the feeding cavity 3. Rotating the outer pipe 52 allows it to cover the third discharge port 302 and / or the second discharge port 202.

[0025] In use, the material to be added is added into the feeding cavity 3 through the feeding pipe 4. When it is necessary to discharge through the first discharge pipe 100, the inner pipe 51 and the outer pipe 52 are rotated so that the first through groove 53 is aligned with the second through groove 9. At this time, the wing plate 54 covers the third discharge port 302 and the second discharge port 202, which is as follows. Figure 2 The material is in the state shown. At this time, the material enters the first discharge pipe 100 through the first channel 53 and the second channel 9 and is discharged from the first discharge port 101. When it is necessary to discharge through the second discharge pipe 200, the inner pipe 51 and the outer pipe 52 are rotated, exposing the second discharge port 202. At this time, the first channel 53 and the second channel 9 are offset, and the wing plate 54 covers the third discharge port 302, which is as shown. Figure 4 The material is in the state shown. At this time, the material enters the second discharge pipe 200 through the second discharge port 202 and is discharged through the second discharge port 201. When it is necessary to discharge through the third discharge pipe 300, the inner pipe 51 and the outer pipe 52 are rotated, exposing the third discharge port 302. At this time, the first through groove 53 is offset from the second through groove 9, and the wing plate 54 covers the second discharge port 202, which is as shown. Figure 5 The state shown is as follows. At this time, the material enters the third discharge pipe 300 through the third discharge port 302 and is discharged through the third discharge port 301.

[0026] Preferably, there are multiple third discharge ports 302 and second discharge ports 202, and the third discharge ports 302 and second discharge ports 202 are spaced apart from each other. This ensures that the material is added evenly.

[0027] Preferably, the second discharge pipe 200 extends vertically and connects to the second discharge port 201 located at the bottom of the feeding body 1. A section of the third discharge pipe 300, away from the third discharge port 302, extends in an inclined direction and connects to the third discharge port 301 located on the side of the feeding body 1. The inclined arrangement of the third discharge pipe 300 allows the material addition point to be located further away, further preventing the problem of excessive local concentration.

[0028] Preferably, the wing plate 54 is provided with several pieces and is evenly distributed circumferentially along the axis of the outer tube 52.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0030] Although this document frequently uses terms such as feeding body 1, cover 2, feeding cavity 3, feeding pipe 4, pipeline switching assembly 5, stepper motor 6, drive shaft 7, pipe fitting 8, second through groove 9, inner pipe 51, outer pipe 52, first through groove 53, wing plate 54, first discharge pipe 100, first discharge port 101, second discharge pipe 200, second discharge port 201, second discharge port 202, third discharge pipe 300, third discharge port 301, and third discharge port 302, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A feeding device for improving the reaction yield of 2-bromobenzofuran, comprising a feeding body (1) and a cover (2) disposed above the feeding body (1), wherein the feeding body (1) and the cover (2) enclose a feeding cavity (3), and the upper end of the cover (2) is provided with a feeding pipe (4) communicating with the feeding cavity (3), characterized in that: The feeding body (1) is also provided with at least two discharge pipes. The discharge ports of different discharge pipes are at different distances from the center line of the feeding body (1). It also includes a pipe switching component (5) set in the feeding body (1). Rotating the pipe switching component (5) can connect the feeding cavity (3) with different discharge pipes.

2. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 1, characterized in that: It also includes a stepper motor (6), which is driven and connected to the pipeline switching assembly (5) via a drive shaft (7).

3. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 1, characterized in that: The discharge pipeline is provided with three parts, namely the first discharge pipeline (100), the second discharge pipeline (200) and the third discharge pipeline (300). The lower end of the first discharge pipeline (100) is connected to the first discharge port (101), the lower end of the second discharge pipeline (200) is connected to the second discharge port (201), and the lower end of the third discharge pipeline (300) is connected to the third discharge port (301). The distance between the third discharge port (301) and the axis of the feeding body (1) is greater than the distance between the second discharge port (201) and the axis of the feeding body (1) is greater than the distance between the first discharge port (101) and the axis of the feeding body (1).

4. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 3, characterized in that: The bottom of the feeding cavity (3) is provided with a third discharge port (302) and a second discharge port (202). The upper end of the third discharge pipe (300) is connected to the feeding cavity (3) through the third discharge port (302). The upper end of the second discharge pipe (200) is connected to the feeding cavity (3) through the second discharge port (202). Rotating the pipe switching component (5) can make the pipe switching component (5) cover the third discharge port (302) and / or the second discharge port (202).

5. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 4, characterized in that: The third discharge port (302) and the second discharge port (202) are provided in multiples, and the third discharge port (302) and the second discharge port (202) are arranged at intervals.

6. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 4, characterized in that: The second discharge pipe (200) extends vertically and is connected to the second discharge port (201) located at the bottom of the feeding body (1).

7. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 4, characterized in that: The third discharge pipe (300) extends in an inclined direction away from the third discharge port (302) and is connected to the third discharge port (301) located on the side of the feeding body (1).

8. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 4, characterized in that: The pipeline switching assembly (5) includes an inner pipe (51) and an outer pipe (52) that are fixedly connected. A first through groove (53) is provided at the corresponding position of the inner pipe (51) and the outer pipe (52). The first discharge pipeline (100) is located inside the inner pipe (51) and is connected to the first through groove (53). The first discharge port (101) is located at the bottom of the inner pipe (51). A pipe fitting (8) protruding from the bottom surface of the feeding cavity (3) is also fixedly provided on the feeding body (1). One end of the pipe fitting (8) extends between the inner pipe (51) and the outer pipe (52). A second through groove (9) is provided on the side of the pipe fitting (8). Rotating the outer pipe (52) can make the first through groove (53) and the second through groove (9) align with each other or stagger each other.

9. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 8, characterized in that: The outer tube (52) is also fixedly connected to several wing plates (54). The lower surface of the wing plate (54) is in contact with the bottom surface of the feeding cavity (3). Rotating the outer tube (52) can make the outer tube (52) cover the third discharge port (302) and / or the second discharge port (202).

10. The feeding device for improving the reaction yield of 2-bromobenzofuran as described in claim 9, characterized in that: The wing plate (54) is provided with several pieces and is evenly distributed circumferentially along the axis of the outer tube (52).

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