Purification device for 2-chloropyridine production

Abstract

The utility model discloses a purification device for 2-chloropyridine production, which belongs to the technical field of product refining and purification and comprises a heating device, an evaporating tank is fixedly connected onto the heating device, the upper end of the evaporating tank is communicated and fixedly connected with a crystallizing tank, the top surface of the crystallizing tank is fixedly connected with a motor, and the motor is fixedly connected with a fan. A rotating shaft of the motor rotatably extends into the crystallizing tank and is fixedly connected with a rotating rod, the rotating rod is slidably sleeved with a mounting cylinder, the side wall of the mounting cylinder is symmetrically and fixedly connected with arc-shaped plates, the arc-shaped plates are slidably attached to the top surface of the crystallizing tank, and the side wall of the rotating rod is fixedly sleeved with a mounting ring; a plurality of fixing cylinders are fixedly connected to the top surface of the mounting ring, ejector rods are slidably connected to the interiors of the fixing cylinders, ejector springs are fixedly connected to the lower ends of the interiors of the fixing cylinders, and the ejector springs are fixedly connected with the ejector rods. Compared with the prior art, the device can effectively scrape crystals on the inner wall of the crystallizing tank, so that waste caused by residues of the crystals in the crystallizing tank is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of product refining and purification, in particular to a purification device for the production of 2-chloropyridine. Background Technique

[0002] 2-Chloropyridine is a very important intermediate for pharmaceuticals and pesticides. Currently, in industry, 3-aminopyridine is generally used as a raw material, and 2-chloropyridine is produced through chlorination, diazotization, and Sandmeyer reaction. However, in the actual production process, during the chlorination process, due to external factors, a large amount of 2,3,6-trichloropyridine impurities are generated, thus affecting 2-chloropyridine.

[0003] Most of the existing purification methods for the production of 2-chloropyridine are to heat and evaporate the solution containing 2-chloropyridine and then perform crystallization purification. The crystallization of 2-chloropyridine will adhere to the inner wall of the crystallization tank. As it accumulates too much, it will fall off by itself and then be collected through structures such as a collection net. However, this crystallization method will cause some crystals to still adhere to the inner wall of the crystallization tank and cannot be taken out after the purification is completed, resulting in waste of 2-chloropyridine and directly affecting the purification effect of 2-chloropyridine. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a purification device for the production of 2-chloropyridine to solve the problems raised in the background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A purification device for the production of 2-chloropyridine, including a heating device for the purification device for the production of 2-chloropyridine. A evaporation tank is fixedly connected to the heating device. The upper end of the evaporation tank is connected and fixedly connected to a crystallization tank. A rectangular hole is opened on the side wall of the evaporation tank, and a collection net is slidably connected in the rectangular hole. A motor is fixedly connected to the top surface of the crystallization tank. The rotating shaft of the motor extends rotatably into the interior of the crystallization tank and is fixedly connected to a rotating rod. An installation cylinder is slidably sleeved on the rotating rod. Arc-shaped plates are symmetrically and fixedly connected to the side wall of the installation cylinder, and the arc-shaped plates are slidably attached to the top surface of the crystallization tank. An installation ring is fixedly sleeved on the side wall of the rotating rod. A plurality of fixed cylinders are fixedly connected to the top surface of the installation ring, and a top rod is slidably connected in the fixed cylinder. A top spring is fixedly connected to the lower end inside the fixed cylinder, and the top spring is fixedly connected to the top rod. Two groups of limiting cylinders are symmetrically and fixedly connected to the rod wall of the rotating rod. A telescopic rod is slidably connected in the limiting cylinder. The end of each group of telescopic rods is fixedly connected to a scraping plate, and the scraping plate is slidably attached to the inner wall of the crystallization tank. A pushing spring is fixedly connected inside the limiting cylinder, and the pushing spring is fixedly connected to the telescopic rod.

[0006] Preferably, arc-shaped blocks are symmetrically and fixedly connected to the rod wall of the rotating rod, and vertical grooves are symmetrically opened on the inner wall of the installation cylinder.

[0007] Preferably, the two arc-shaped blocks fixedly connected to the side wall of the rotating rod are respectively slidably connected to the interiors of two vertical grooves formed in the inner wall of the mounting cylinder.

[0008] Preferably, limiting grooves are symmetrically formed in the inner wall of the limiting cylinder, and limiting blocks are symmetrically and fixedly connected to the side wall of the telescopic rod.

[0009] Preferably, the two limiting blocks fixedly connected to the side wall of the telescopic rod are respectively slidably connected to the interiors of two limiting grooves formed in the inner wall of the limiting cylinder.

[0010] Preferably, rectangular grooves are symmetrically formed in the inner wall of the fixed cylinder, and rectangular blocks are symmetrically and fixedly connected to the side wall of the ejector rod.

[0011] Preferably, the two rectangular blocks fixedly connected to the side wall of the ejector rod are respectively slidably connected to the interiors of rectangular grooves formed in the inner wall of the fixed cylinder.

[0012] Preferably, a rectangular sealing gasket is fixedly connected to the side wall of the collection net, and the outer wall of the rectangular sealing gasket is sealingly attached to the inner wall of the rectangular hole.

[0013] Compared with the prior art, the technical effects and advantages of the present utility model are as follows:

[0014] In the purification device for the production of 2-chloropyridine, when the solution containing 2-chloropyridine evaporates in the evaporation tank and crystals are formed on the inner wall of the upper crystallization tank, at this time, the motor is started, and the rotating rod and the mounting cylinder slidably sleeved on the rotating rod are driven by the motor to rotate. The two arc-shaped plates are driven to rotate by the mounting cylinder. Meanwhile, due to the arrangement of the mounting ring, the fixed cylinder, the ejector rod and the top spring, the top spring pushes the ejector rod to move upward, and at the same time, the mounting cylinder and the arc-shaped plate fixedly connected to the upper end thereof are driven by the ejector rod to slidably fit on the upper end inside the crystallization tank. Therefore, as the two arc-shaped plates rotate, the crystals on the top surface inside the crystallization tank can be effectively scraped off.

[0015] In the purification device for the production of 2-chloropyridine, as the rotating rod rotates, the limiting cylinder, the telescopic rod and the scraper fixedly connected to its side wall will be driven to rotate synchronously. At this time, the push spring inside the limiting cylinder pushes the telescopic rod and the scraper at the end of the telescopic rod to move towards the inner wall of the crystallization tank until the scraper slidably fits on the inner wall of the crystallization tank and the crystals on the inner wall of the crystallization tank can be scraped off as the scraper rotates. Compared with the prior art, this device can effectively scrape off the crystals on the inner wall of the crystallization tank, thereby preventing the waste caused by the residue of crystals in the crystallization tank. Description of the Drawings

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Structural schematic diagram of the present invention;

[0018] Figure 2 Three-dimensional sectional view of the crystallization tank in the present invention;

[0019] Figure 3 Structural schematic diagram of the rotating rod, mounting cylinder, arc plate, etc. in the present invention;

[0020] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure of part A in the present invention;

[0021] Figure 5 Planar sectional view of the fixed cylinder in the present invention;

[0022] Figure 6 Planar sectional view of the limiting cylinder in the present invention.

[0023] Explanation of reference numerals in the drawings:

[0024] In the figure: 1. Heating device; 2. Evaporation tank; 3. Crystallization tank; 4. Arc block; 5. Limiting cylinder; 6. Telescopic rod; 7. Rectangular hole; 8. Collection net; 9. Motor; 10. Rotating rod; 11. Mounting cylinder; 12. Arc plate; 13. Mounting ring; 14. Fixed cylinder; 15. Thrust rod; 16. Thrust spring; 17. Scraper; 18. Push spring; 19. Limiting block; 20. Rectangular block; 21. Rectangular gasket. Specific embodiments

[0025] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, to avoid confusion with the present invention, some well-known technical features in the art are not described.

[0026] Unless otherwise defined, the up, down, left, right, front, back, inside and outside directions involved in this article are based on the up, down, left, right, front, back, inside and outside directions in the drawings shown in the present invention, and are hereby explained together.

[0027] The connection method can adopt existing methods such as bonding, welding, bolt connection, etc., subject to actual needs.

[0028] As Figures 1 to 6 shown, the main structure of a purification device for 2-chloropyridine production is a heating device 1. A evaporation tank 2 is fixedly connected to the heating device 1. The upper end of the evaporation tank 2 is communicated and fixedly connected with a crystallization tank 3. Thanks to the installation method of the evaporation tank 2 and the crystallization tank 3, the steam generated in the evaporation tank 2 all moves upward and enters the interior of the crystallization tank 3. A rectangular hole 7 is opened on the side wall of the evaporation tank 2. A collection net 8 is slidably connected in the rectangular hole 7. A rectangular sealing gasket 21 is fixedly connected to the side wall of the collection net 8, and the outer wall of the rectangular sealing gasket 21 is hermetically attached to the inner wall of the rectangular hole 7, so as to effectively seal between the collection net 8 and the inner wall of the rectangular hole 7;

[0029] The top surface of the crystallization tank 3 is fixedly connected with a motor 9. The rotating shaft of the motor 9 extends rotatably into the interior of the crystallization tank 3 and is fixedly connected with a rotating rod 10. An installation cylinder 11 is slidably sleeved on the rotating rod 10. The side walls of the installation cylinder 11 are symmetrically and fixedly connected with arc-shaped plates 12, and the arc-shaped plates 12 are slidably attached to the top surface of the crystallization tank 3. Arc-shaped blocks 4 are symmetrically and fixedly connected to the rod wall of the rotating rod 10. Vertical grooves are symmetrically formed in the inner wall of the installation cylinder 11. The two arc-shaped blocks 4 fixedly connected to the side wall of the rotating rod 10 are respectively slidably connected to the interiors of the two vertical grooves formed in the inner wall of the installation cylinder 11. Thanks to the fact that the arc-shaped blocks 4 fixedly connected to the side wall of the rotating rod 10 are all slidably connected to the vertical grooves formed in the inner wall of the installation cylinder 11, this can effectively make the installation cylinder 11 and the rotating rod 10 rotate synchronously. An installation ring 13 is fixedly sleeved on the side wall of the rotating rod 10. A plurality of fixed cylinders 14 are fixedly connected to the top surface of the installation ring 13, and a top rod 15 is slidably connected in the fixed cylinder 14. Rectangular grooves are symmetrically formed in the inner wall of the fixed cylinder 14. Rectangular blocks 20 are symmetrically and fixedly connected to the side wall of the top rod 15. The two rectangular blocks 20 fixedly connected to the side wall of the top rod 15 are respectively slidably connected to the interiors of the two rectangular grooves formed in the inner wall of the fixed cylinder 14. Thanks to the fact that the two rectangular blocks 20 fixedly connected to the side wall of the top rod 15 are respectively slidably connected to the interiors of the two rectangular grooves formed in the inner wall of the fixed cylinder 14, this can effectively limit the sliding direction of the top rod 15. A top spring 16 is fixedly connected to the lower end inside the fixed cylinder 14, and the top spring 16 is fixedly connected with the top rod 15. Start the motor 9. Drive the rotating rod 10 fixedly connected to the end of its rotating shaft by the motor 9 and the installation ring 13 fixedly sleeved on the rotating rod 10 to rotate. Drive the plurality of fixed cylinders 14 fixedly connected to its top surface and the top rod 15 slidably connected in the fixed cylinder 14 by the installation ring 13. Then drive the installation cylinder 11 fixedly connected to the upper end of the top rod 15 and the two arc-shaped plates 12 fixedly connected to the side wall of the installation cylinder 11 to rotate by the plurality of top rods 15. At this time, thanks to the settings of the installation ring 13, the fixed cylinder 14, the top rod 15 and the top spring 16, the top spring 16 pushes the top rod 15 to move upward, and at the same time drives the installation cylinder 11 and the arc-shaped plates 12 fixedly connected to its upper end to slidably fit to the upper end inside the crystallization tank 3 through the top rod 15. Therefore, as the two arc-shaped plates 12 rotate, the crystals on the top surface inside the crystallization tank 3 can be effectively scraped off;

[0030] On the rod wall of the rotating rod 10, two groups of limiting cylinders 5 are symmetrically and fixedly connected. An expansion rod 6 is slidably connected inside the limiting cylinder 5. Limiting grooves are symmetrically formed on the inner wall of the limiting cylinder 5. On the side wall of the expansion rod 6, two limiting blocks 19 are symmetrically and fixedly connected. The two limiting blocks 19 fixedly connected to the side wall of the expansion rod 6 are respectively slidably connected inside the two limiting grooves formed on the inner wall of the limiting cylinder 5. Thanks to the fact that the two limiting blocks 19 fixedly connected to the side wall of the expansion rod 6 are respectively slidably connected inside the limiting grooves formed on the inner wall of the limiting cylinder 5, the sliding direction of the expansion rod 6 can be effectively limited in this way. The end of each group of expansion rods 6 is fixedly connected with a scraping plate 17, and the scraping plate 17 is slidably attached to the inner wall of the crystallization tank 3. A pushing spring 18 is fixedly connected inside the limiting cylinder 5, and the pushing spring 18 is fixedly connected with the expansion rod 6. The rotation of the rotating rod 10 will synchronously drive the limiting cylinder 5, the expansion rod 6 and the scraping plate 17 fixedly connected to its side wall to rotate. At this time, the pushing spring 18 inside the limiting cylinder 5 pushes the expansion rod 6 and the scraping plate 17 at the end of the expansion rod 6 towards the inner wall of the crystallization tank 3 until the scraping plate 17 is slidably attached to the inner wall of the crystallization tank 3 and the crystals on the inner wall of the crystallization tank 3 can be scraped off as the scraping plate 17 rotates.

[0031] Working principle

[0032] For the purification device used in the production of 2-chloropyridine, during use, first add the solution containing 2-chloropyridine into the evaporation tank 2. Subsequently, heat it through the heating device 1 to make it evaporate and enter the crystallization tank 3. Then, crystallization starts on the inner wall of the crystallization tank 3. As the crystallization accumulates, the crystallization will fall off and land on the collection net 8 arranged above the inside of the evaporation tank 2. When the crystallization is completed or there is too much crystallization on the inner wall of the crystallization tank 3, at this time, start the motor 9. Drive the rotating rod 10 fixedly connected to the end of its rotating shaft by the motor 9 and the mounting ring 13 fixedly sleeved on the rotating rod 10 to rotate. Drive the multiple fixed cylinders 14 fixedly connected to its top surface and the ejector rods 15 slidably connected inside the fixed cylinders 14 to rotate through the mounting ring 13. Subsequently, drive the mounting cylinder 11 fixedly connected to the upper end of each ejector rod 15 and the two arc-shaped plates 12 fixedly connected to the side wall of the mounting cylinder 11 to rotate through the ejector rods 15. At this time, thanks to the settings of the mounting ring 13, the fixed cylinders 14, the ejector rods 15 and the top springs 16, push the ejector rods 15 to move upward through the top springs 16. At the same time, drive the mounting cylinder 11 and the arc-shaped plates 12 fixedly connected to the upper end of the ejector rods 15 to slide and fit against the upper end inside the crystallization tank 3 through the ejector rods 15. Therefore, as the two arc-shaped plates 12 rotate, the crystallization on the inner top surface of the crystallization tank 3 can be effectively scraped off. At the same time, as the rotating rod 10 rotates, it will synchronously drive the limiting cylinder 5, the telescopic rod 6 and the scraper 17 fixedly connected to its side wall to rotate. At this time, push the telescopic rod 6 and the scraper 17 at the end of the telescopic rod 6 to move towards the inner wall of the crystallization tank 3 through the push spring 18 inside the limiting cylinder 5 until the scraper 17 slides and fits against the inner wall of the crystallization tank 3 and can scrape off the crystallization on the inner wall of the crystallization tank 3 as the scraper 17 rotates. When the crystallization on the collection net 8 accumulates to a predetermined amount, at this time, the collection net 8 can be pulled out to collect the crystallization.

[0033] It should be noted that in this article, relational terms such as "one" and "two" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation. An element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0034] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A purification device for the production of 2-chloropyridine, including a heating device (1) for the purification device for the production of 2-chloropyridine, characterized in that: The heating device (1) is fixedly connected with an evaporation tank (2). The upper end of the evaporation tank (2) is communicated and fixedly connected with a crystallization tank (3). A rectangular hole (7) is formed in the side wall of the evaporation tank (2). A collection net (8) is slidably connected in the rectangular hole (7). A motor (9) is fixedly connected to the top surface of the crystallization tank (3). The rotating shaft of the motor (9) rotatably extends into the interior of the crystallization tank (3) and is fixedly connected with a rotating rod (10). An installation cylinder (11) is slidably sleeved on the rotating rod (10). Arc-shaped plates (12) are symmetrically and fixedly connected to the side wall of the installation cylinder (11), and the arc-shaped plates (12) are slidably attached to the top surface of the crystallization tank (3). An installation ring (13) is fixedly sleeved on the side wall of the rotating rod (10). A plurality of fixed cylinders (14) are fixedly connected to the top surface of the installation ring (13). A top rod (15) is slidably connected in the fixed cylinder (14). A top spring (16) is fixedly connected to the lower end inside the fixed cylinder (14), and the top spring (16) is fixedly connected with the top rod (15). Two groups of limiting cylinders (5) are symmetrically and fixedly connected to the rod wall of the rotating rod (10). A telescopic rod (6) is slidably connected in the limiting cylinder (5). The end of each group of telescopic rods (6) is fixedly connected with a scraping plate (17), and the scraping plate (17) is slidably attached to the inner wall of the crystallization tank (3). A pushing spring (18) is fixedly connected inside the limiting cylinder (5), and the pushing spring (18) is fixedly connected with the telescopic rod (6).

2. The purification device for the production of 2-chloropyridine according to claim 1, characterized in that: Arc-shaped blocks (4) are symmetrically and fixedly connected to the rod wall of the rotating rod (10). Vertical grooves are symmetrically formed in the inner wall of the installation cylinder (11).

3. The purification device for the production of 2-chloropyridine according to claim 2, characterized in that: The two arc-shaped blocks (4) fixedly connected to the side wall of the rotating rod (10) are respectively slidably connected inside the two vertical grooves formed in the inner wall of the installation cylinder (11).

4. The purification device for the production of 2-chloropyridine according to claim 1, wherein: Limiting grooves are symmetrically formed in the inner wall of the limiting cylinder (5). Limiting blocks (19) are symmetrically and fixedly connected to the side wall of the telescopic rod (6).

5. The purification device for the production of 2-chloropyridine according to claim 4, characterized in that: The two limiting blocks (19) fixedly connected to the side wall of the telescopic rod (6) are respectively slidably connected inside the two limiting grooves formed in the inner wall of the limiting cylinder (5).

6. The purification device for the production of 2-chloropyridine according to claim 1, wherein: Rectangular grooves are symmetrically formed in the inner wall of the fixed cylinder (14). Rectangular blocks (20) are symmetrically and fixedly connected to the side wall of the top rod (15).

7. The purification device for the production of 2-chloropyridine according to claim 6, characterized in that: The two rectangular blocks (20) fixedly connected to the side wall of the top rod (15) are respectively slidably connected inside the rectangular grooves formed in the inner wall of the fixed cylinder (14).

8. The purification device for the production of 2-chloropyridine according to claim 1, characterized in that: A rectangular sealing gasket (21) is fixedly connected to the side wall of the collection net (8), and the outer wall of the rectangular sealing gasket (21) is hermetically attached to the inner wall of the rectangular hole (7).

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