A crystallization kettle for chemical reagents

Abstract

This utility model discloses a crystallization kettle for chemical reagents, belonging to the field of chemical reagent production technology. It includes a crystallization kettle body with a top cover snapped onto the top. A sealing block is fixedly installed inside the bottom of the top cover, and a driven gear is rotatably connected inside the bottom of the sealing block. The driven gear is located inside a gear ring and meshes with the gear ring. This utility model connects to a power supply block of a heating mechanism, uses a temperature controller to preset the target temperature of the heating resistor inside the stirring rod, and simultaneously introduces a heating medium into the inner wall heating cavity through an air inlet pipe on the outside of the crystallization kettle body. This causes the stirring rod, fixed to the first transmission gear, to rotate synchronously. The spiral structure of the stirring rod stirs the chemical reagents inside the kettle during rotation, while the heat-conducting oil heated by the heating resistor directly transfers heat to the reagents in the central area, solving the problem of lag in the central temperature caused by traditional side-wall heating and ensuring uniform temperature of the reagents inside the kettle.

Description

Technical Field

[0001] This utility model belongs to the field of chemical reagent production technology, specifically a crystallization kettle for chemical reagents. Background Technology

[0002] As key basic materials for chemical research, component analysis, and industrial production, the purity, crystal form, and particle size distribution of chemical reagents directly determine their application effects. For example, organic intermediates used in precision synthesis require a purity of over 99.9%, while inorganic salt reagents used for detection and analysis need to have a uniform crystal form to ensure a stable dissolution rate. Crystallization, as the core process for the purification and preparation of chemical reagents, achieves purification and morphology control by controlling the precipitation of solutes from solution, molten state, or gas phase. The crystallization vessel, as the core equipment of this process, directly affects the crystallization efficiency and reagent product quality through its structural design and functional performance. In the existing technology, crystallization kettles used for chemical reagents are mainly divided into the following categories: First, wall-heated crystallization kettles, which are equipped with a jacket on the outside of the kettle body or a heating cavity on the inside, and heat transfer mediums such as high-temperature steam or heat transfer oil are introduced. The kettle wall conducts heat to achieve the heating, evaporation and crystallization of the material inside the kettle. This type of equipment has a simple structure and is widely used for the crystallization of high-temperature resistant and low-viscosity reagents. Second, center-stirred crystallization kettles, which are equipped with a stirring shaft and spiral / paddle stirring blades in the center of the kettle body. The stirring shaft is driven by a motor to rotate, thereby achieving the mixing of the material inside the kettle. Combined with wall heating, the temperature distribution is improved. This type of equipment is suitable for reaction crystallization scenarios where it is necessary to avoid local over-concentration.

[0003] The existing technology has the following shortcomings: Uneven heat transfer: Existing wall-heated crystallizers rely on the vessel wall to transfer heat to the center. High-viscosity reagents have low thermal conductivity, which easily leads to a temperature gradient of "overheating on the wall and low temperature in the center". The material in the wall area is prone to carbonization and decomposition due to high temperature, producing impurities that contaminate the reagent. The material in the center area, due to insufficient temperature, causes crystallization to lag, forming crystals with uneven particle size. Utility Model Content

[0004] To overcome the above-mentioned defects, this utility model provides a crystallization kettle for chemical reagents, which solves the problem of uneven heat transfer in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a crystallization vessel for chemical reagents, comprising a crystallization vessel body, a top cover snapped to the top of the crystallization vessel body, a motor disposed on one side of the top of the top cover, a drive gear coaxially fixedly connected to the output end of the motor, a first transmission gear meshing with one side of the drive gear, the first transmission gear being rotatably connected to the top cover, and a stirring rod being fixedly connected through the first transmission gear, the stirring rod having a spiral structure; A second transmission gear is fixedly connected to the outside of the stirring rod. A sealing block is fixedly installed inside the bottom of the top cover. A driven gear is rotatably connected to the bottom of the sealing block. The driven gear meshes with the second transmission gear. A toothed ring is rotatably connected to the inside of the sealing block. The driven gear is located inside the toothed ring and meshes with the toothed ring. The bottom of the toothed ring is connected to a fixed ring, and multiple sets of scrapers are fixedly installed at the bottom of the fixed ring. The scrapers are in contact with the inner wall of the crystallization vessel body. The stirring rod is located at the center of the crystallization vessel body, and the inside of the stirring rod is a hollow structure. A heating mechanism is rotatably connected to the top of the stirring rod. The heating mechanism includes a heating resistor, a temperature controller, and a power supply block. The heating resistor is located inside the stirring rod, which is filled with heat-conducting oil. An air inlet pipe is connected to the outside of the crystallization vessel body, and a heating cavity is opened on the inner wall of the crystallization vessel body to cooperate with the air inlet pipe.

[0006] As a further embodiment of this utility model: a protective shell is snapped onto the top of the top cover, the motor is fixed inside the protective shell, and a limiting ring is installed inside the protective shell; the heating mechanism is fixedly connected to the limiting ring.

[0007] As a further embodiment of this utility model: a pressure relief valve is provided on the outside of the crystallization vessel body, and a feed pipe is connected to one side of the crystallization vessel body, and a discharge pipe is connected to the bottom of the crystallization vessel body.

[0008] As a further embodiment of this utility model: a drain pipe is provided on one side of the bottom of the crystallization vessel body, and multiple sets of support legs are fixedly installed at the bottom of the crystallization vessel body.

[0009] As a further embodiment of this utility model: multiple sets of slots are provided on the other side of the scraper, the slots are serrated, and a rotating ring is fixedly connected to the outside of the stirring rod below the second transmission gear, the rotating ring being rotatably connected to the fixed ring.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The power supply block of the heating mechanism is connected to the power supply. The target temperature of the heating resistor inside the stirring rod is preset by the temperature controller. At the same time, the heating medium is introduced into the heating cavity inside the crystallizer through the air inlet pipe on the outside of the main body, so that the heating cavity and the heat transfer oil inside the stirring rod are heated synchronously. The motor output drives the drive gear to rotate, which in turn meshes with the first transmission gear, causing the stirring rod, which is fixed to the first transmission gear, to rotate synchronously. The spiral structure of the stirring rod stirs the chemical reagents inside the reactor during rotation. At the same time, the heat-conducting oil inside the stirring rod, heated by the heating resistor, directly transfers heat to the reagents in the central area, solving the problem of lag in the central temperature caused by traditional side-wall heating and ensuring uniform temperature of the reagents inside the reactor. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a first-view schematic diagram of the cross-sectional structure of this utility model; Figure 3 This is a second-view schematic diagram of the cross-sectional structure of this utility model; Figure 4 This is a schematic diagram showing the cross-sectional effect of the main structure of this utility model.

[0012] In the diagram: 1. Crystallization vessel body; 2. Top cover; 3. Feed pipe; 4. Discharge pipe; 5. Motor; 6. Drive gear; 7. First transmission gear; 8. Stirring rod; 9. Second transmission gear; 10. Driven gear; 11. Gear ring; 12. Fixing ring; 13. Scraper; 14. Air inlet pipe; 15. Liquid discharge pipe; 16. Pressure relief valve; 17. Protective shell; 18. Sealing block; 19. Heating mechanism; 20. Limiting ring. Detailed Implementation

[0013] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0014] like Figures 1-4 As shown, this utility model provides a technical solution: A crystallization vessel for chemical reagents includes a crystallization vessel body 1, a top cover 2 snapped to the top of the crystallization vessel body 1, a motor 5 disposed on one side of the top of the top cover 2, a drive gear 6 coaxially fixedly connected to the output end of the motor 5, a first transmission gear 7 meshing with one side of the drive gear 6, the first transmission gear 7 being rotatably connected to the top cover 2, and a stirring rod 8 being fixedly connected through the first transmission gear 7, the stirring rod 8 having a spiral structure. A second transmission gear 9 is fixedly connected to the outside of the stirring rod 8. A sealing block 18 is fixedly installed inside the bottom of the top cover 2. A driven gear 10 is rotatably connected inside the bottom of the sealing block 18. The driven gear 10 meshes with the second transmission gear 9. A toothed ring 11 is rotatably connected inside the sealing block 18. The driven gear 10 is located inside the toothed ring 11 and meshes with the toothed ring 11. A fixed ring 12 is connected to the bottom of the toothed ring 11. Multiple scrapers 13 are fixedly installed at the bottom of the fixed ring 12. The scrapers 13 are in contact with the inner wall of the crystallization vessel body 1. The stirring rod 8 is located at the center of the crystallization vessel body 1. The stirring rod 8 has a hollow structure inside. A heating mechanism 19 is rotatably connected to the top of the stirring rod 8. Heating mechanism 19 includes heating resistor, temperature controller and power supply block. Heating resistor is located inside stirring rod 8. Stirring rod 8 is filled with heat transfer oil. An air inlet pipe 14 is connected to the outside of crystallization vessel body 1. A heating cavity is opened on the inner wall of crystallization vessel body 1 to cooperate with air inlet pipe 14. Specifically, the power supply is turned on through the power supply block of the heating mechanism 19, and the target temperature of the heating resistor inside the stirring rod 8 is preset by the temperature controller. At the same time, the heating medium (high temperature steam) is introduced into the heating cavity of the inner wall through the air inlet pipe 14 on the outside of the crystallization vessel body 1, so that the heating cavity and the heat transfer oil inside the stirring rod 8 are heated synchronously. After the temperature controller shows that the temperature of the heat transfer oil and the temperature of the inner wall of the crystallization vessel body 1 have reached the initial temperature required for the crystallization of chemical reagents, the medium supply of the air inlet pipe 14 is turned off, and the preparation is completed. Next, the chemical reagent raw material to be crystallized is injected into the crystallization vessel body 1. Then, the motor 5 on the top of the top cover 2 is started. The output end of the motor 5 drives the drive gear 6 to rotate. The drive gear 6 meshes with the first transmission gear 7, so that the stirring rod 8 fixed with the first transmission gear 7 rotates synchronously. The spiral structure of the stirring rod 8 stirs the chemical reagent in the vessel during the rotation. At the same time, the heat transfer oil inside the rod, which is heated by the heating resistor, directly transfers heat to the reagent in the central area, solving the problem of lag in the central temperature caused by traditional side wall heating only, and ensuring uniform temperature of the reagent in the vessel. At the same time, the second transmission gear 9 on the outside of the stirring rod 8 rotates with the stirring rod 8, meshing and driving the driven gear 10 at the bottom of the sealing block 18 to rotate. The driven gear 10 further meshes and drives the inner toothed ring 11 to rotate. The toothed ring 11 drives the fixed ring 12 connected to the bottom and the multiple sets of scrapers 13 at the bottom of the fixed ring 12 to rotate synchronously. The scrapers 13 are in close contact with the inner wall of the crystallization vessel body 1, scraping away the reagent crystals attached to the inner wall during the rotation. Under the combined action of stirring and heating, the chemical reagent gradually reaches a supersaturated state and crystals precipitate. During this process, the heating temperature of the stirring rod 8 can be monitored and finely adjusted in real time by the temperature controller of the heating mechanism 19 to ensure the temperature stability of the crystallization process. After crystallization is completed, the motor 5 and the heating mechanism 19 are turned off. After the temperature inside the vessel drops to room temperature, the discharge structure at the bottom of the crystallization vessel body 1 is opened to discharge the material containing crystals, thus completing the entire crystallization operation. The top cover 2 is snapped to the top of the protective shell 17. The motor 5 is fixed inside the protective shell 17, and a limit ring 20 is installed inside the protective shell 17. The heating mechanism 19 is fixedly connected to the limit ring 20. A pressure relief valve 16 is provided on the outside of the crystallization vessel body 1. A feed pipe 3 is connected to one side of the crystallization vessel body 1. A discharge pipe 4 is connected to the bottom of the crystallization vessel body 1. A drain pipe 15 is provided on one side of the bottom of the crystallization vessel body 1. Multiple sets of support legs are fixedly installed at the bottom of the crystallization vessel body 1. Multiple sets of slots are opened on the other side of the scraper 13. The slots are serrated. A rotating ring is fixedly connected to the outside of the stirring rod 8 below the second transmission gear 9. The rotating ring is rotatably connected to the fixed ring 12. Specifically, first open the valve of feed pipe 3, and accurately inject the chemical reagent raw material to be crystallized into the crystallization vessel body 1 through feed pipe 3. During the injection process, the feed speed can be adjusted by the flow control valve of feed pipe 3 to avoid raw material splashing or overflow. After the injection is completed, close the valve of feed pipe 3. Next, the motor 5 inside the protective shell 17 is started. The motor 5 drives the stirring system to run and the heating mechanism 19 is turned on at the same time. During the stirring and heating process, if the pressure inside the crystallizer body 1 increases due to reagent reaction or evaporation, the pressure relief valve 16 will automatically open to relieve pressure and ensure that the pressure inside the vessel is stable within a safe range. When the chemical reagent gradually precipitates crystals under the action of stirring and heating, if it is necessary to remove the excess solvent generated during the crystallization process, the valve of the drain pipe 15 can be opened to discharge the solvent through the drain pipe 15. After the crystallization is completed, the motor 5 and the heating mechanism 19 are turned off. After the temperature inside the kettle drops to the appropriate discharge temperature, the valve of the discharge pipe 4 is opened to allow the crystal material to be discharged through the discharge pipe 4, thus completing the crystallization operation. The working principle of this utility model is as follows: First, the power supply is turned on through the power supply block of the heating mechanism 19. The target temperature of the heating resistor inside the stirring rod 8 is preset by the temperature controller. At the same time, high-temperature steam is introduced into the heating cavity of the inner wall through the air inlet pipe 14 on the outside of the crystallizer body 1, so that the heating cavity and the heat transfer oil filled inside the stirring rod 8 are heated synchronously. After the temperature controller shows that the temperature of both has reached the initial temperature required for the crystallization of chemical reagents, the steam supply of the air inlet pipe 14 is turned off, and the valve of the feed pipe 3 is opened. The chemical reagent raw material to be crystallized is accurately injected into the crystallizer body 1 through the feed pipe 3. The feed speed is adjusted by the flow control valve on the feed pipe 3 to avoid raw material splashing or overflow. After the injection is completed, the valve of the feed pipe 3 is closed to ensure that the top cover 2 and the crystallizer body 1 are tightly connected. The protective shell 17 is securely fastened to the top of the top cover 2 to protect the internal motor 5 and transmission components. Secondly, the motor 5 inside the protective shell 17 is started. The output end of the motor 5 drives the drive gear 6 to rotate. The drive gear 6 meshes with the first transmission gear 7, causing the stirring rod 8, which is fixed to the first transmission gear 7, to rotate synchronously. The spiral structure of the stirring rod 8 stirs the chemical reagent in the reactor when it rotates. At the same time, the heat transfer oil inside the rod, which is heated by the heating resistor, directly transfers heat to the reagent in the central area. Combined with the residual heat of the heating cavity inside the crystallization reactor body 1, the temperature of the reagent in the reactor is made uniform, avoiding the lag in the central temperature caused by traditional side wall heating only. At the same time, the second transmission gear 9 on the outside of the stirring rod 8 rotates with the stirring rod 8, meshing and driving the driven gear 10 at the bottom of the sealing block 18 to rotate. The driven gear 10 further meshes and drives the inner toothed ring 11 to rotate. The toothed ring 11 drives the fixed ring 12 connected at the bottom and multiple sets of scrapers 13 to rotate synchronously. The scrapers 13 are in close contact with the inner wall of the crystallization vessel body 1, scraping off the reagent crystals attached to the inner wall. The serrated grooves on the scrapers 13 can reduce scraping resistance and prevent crystal particles from agglomerating. Finally, the rotating ring located below the second transmission gear 9 on the outer side of the stirring rod 8 is rotatably connected to the fixed ring 12, which can assist the fixed ring 12 in rotating stably and prevent the scraper 13 from being misaligned, resulting in incomplete scraping. The limiting ring 20 inside the protective shell 17 fixes the heating mechanism 19, preventing the heating mechanism 19 from shifting with the stirring rod 8 and ensuring stable central heating. If the pressure inside the crystallizing vessel body 1 increases due to reagent reaction or evaporation, the pressure relief valve 16 on the outside will automatically open to release pressure, ensuring that the pressure inside the vessel is within a safe range and preventing reagent decomposition or equipment damage due to high pressure. If excess solvent needs to be discharged during the crystallization process, the drain pipe 15 valve on one side of the bottom of the crystallizing vessel body 1 can be opened to discharge the solvent for subsequent recovery or treatment. The filter screen at the inlet end of the drain pipe 15 can prevent crystallized particles from clogging the pipe. The multiple sets of support legs at the bottom of the crystallizing vessel body 1 ensure that the equipment is placed stably and avoids shaking during operation, which would affect the crystallization conditions.

[0015] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A crystallization vessel for chemical reagents, comprising a crystallization vessel body (1), characterized in that: The crystallization vessel body (1) is snapped to the top of a top cover (2). A motor (5) is provided on one side of the top of the top cover (2). A drive gear (6) is coaxially fixedly connected to the output end of the motor (5). A first transmission gear (7) is meshed on one side of the drive gear (6). The first transmission gear (7) is rotatably connected to the top cover (2). A stirring rod (8) is fixedly connected through the first transmission gear (7). The stirring rod (8) has a spiral structure. A second transmission gear (9) is fixedly connected to the outside of the stirring rod (8), and a sealing block (18) is fixedly installed at the bottom inside the top cover (2). A driven gear (10) is rotatably connected to the bottom inside the sealing block (18). The driven gear (10) meshes with the second transmission gear (9). A toothed ring (11) is rotatably connected to the inside of the sealing block (18). The driven gear (10) is located inside the toothed ring (11) and meshes with the toothed ring (11). The toothed ring (11) is connected to a fixed ring (12) at the bottom. Multiple scrapers (13) are fixedly installed at the bottom of the fixed ring (12). The scrapers (13) are in contact with the inner wall of the crystallization vessel body (1). The stirring rod (8) is located at the center of the crystallization vessel body (1). The stirring rod (8) has a hollow structure inside. The top of the stirring rod (8) is rotatably connected to a heating mechanism (19). The heating mechanism (19) includes a heating resistor, a temperature controller and a power supply block. The heating resistor is located inside the stirring rod (8). The stirring rod (8) is filled with heat-conducting oil. An air inlet pipe (14) is connected to the outside of the crystallization vessel body (1). A heating cavity is opened on the inner wall of the crystallization vessel body (1) to cooperate with the air inlet pipe (14).

2. The crystallization kettle for chemical reagents according to claim 1, characterized in that: The top cover (2) is snapped to a protective shell (17), the motor (5) is fixed inside the protective shell (17), and a limiting ring (20) is installed inside the protective shell (17). The heating mechanism (19) is fixedly connected to the limiting ring (20).

3. A crystallization kettle for chemical reagents according to claim 1, characterized in that: A pressure relief valve (16) is provided on the outside of the crystallization vessel body (1), and a feed pipe (3) is connected to one side of the crystallization vessel body (1), and a discharge pipe (4) is connected to the bottom of the crystallization vessel body (1).

4. A crystallization kettle for chemical reagents according to claim 1, characterized in that: A drain pipe (15) is provided on one side of the bottom of the crystallization vessel body (1), and multiple sets of support legs are fixedly installed at the bottom of the crystallization vessel body (1).

5. A crystallization kettle for chemical reagents according to claim 1, characterized in that: The scraper (13) has multiple sets of slots on the other side, the slots are serrated, and a rotating ring is fixedly connected to the outside of the stirring rod (8) below the second transmission gear (9), the rotating ring being rotatably connected to the fixed ring (12).

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