Heat exchange stirring reaction kettle for dispersant synthesis

Abstract

The utility model relates to a chemical equipment technical field, concretely relates to a heat exchange stirring reaction kettle for dispersing agent synthesis, the utility model provides a heat exchange stirring reaction kettle for dispersing agent synthesis, including kettle body, the drive motor of setting at the top of kettle body and the stirring shaft of intruding kettle body inside, the kettle body outside is provided with the jacket, is provided with cooling medium import and cooling medium export on the jacket, the inside fixed setting of kettle body has the fairlead, the fairlead divides the space inside kettle body into the region in the cylinder and the region outside the cylinder, the stirring shaft penetrates the fairlead, is provided with the stirring paddle of being located fairlead inside and the stirrer of being located between fairlead and kettle body inner wall on it, the stirrer is frame type wall scraper, the inside setting of fairlead has built -in heat exchange subassembly, built -in heat exchange subassembly includes the annular central heat exchange pipe of setting at the outside of stirring paddle and the spiral coil pipe around its arrangement.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a heat exchange stirring reactor for dispersant synthesis. Background Technology

[0002] The heat exchange stirred reactor for dispersant synthesis is a core piece of equipment in the chemical industry for dispersant preparation. Its main function is to fully mix reactants such as monomers, initiators, and solvents through stirring, and at the same time control the reaction temperature through the heat exchange system to ensure that the synthesis reaction proceeds in a stoichiometric ratio, thereby obtaining a dispersant product with uniform molecular weight distribution and stable performance.

[0003] Traditional reactors of this type typically employ a combination of jacketed heat exchange and a single agitator design. The jacket allows for indirect heat exchange only through the reactor wall, resulting in a long and slow heat transfer path, which can easily lead to large temperature gradients within the reactor. The single agitator has limited flow-driving capability, making it difficult to create effective material circulation; insufficient local mixing can lead to reaction hotspots or uneven material dispersion. Furthermore, materials tend to scale on the inner wall of the reactor during the reaction, and traditional designs lack specific cleaning structures, requiring shutdown for disassembly and cleaning, thus impacting production efficiency. These problems limit the synthesis quality and production capacity of high-performance dispersants (such as high molecular weight polycarboxylate dispersants) and urgently require improvement. Utility Model Content

[0004] The purpose of this invention is to provide a heat-exchange stirred reactor for dispersant synthesis that features high-efficiency heat transfer, strong shearing, uniform mixing, and self-cleaning function. By optimizing the stirring structure and the layout of the heat exchange components, the performance bottleneck of traditional reactors is solved.

[0005] The technical solution provided by this utility model is a heat exchange stirring reactor for dispersant synthesis, including a reactor body, a drive motor installed at the top of the reactor body and a stirring shaft extending into the reactor body. The reactor body is provided with a jacket, and the jacket is provided with a cooling medium inlet and a cooling medium outlet. A flow guide tube is fixedly installed inside the vessel body, which divides the internal space of the vessel body into an inner area and an outer area. The stirring shaft passes through the guide tube, and a stirring paddle located inside the guide tube and a stirrer located between the guide tube and the inner wall of the vessel are provided on it. The stirrer is a frame-type wall scraper. The guide tube is equipped with an internal heat exchange assembly, which includes an annular central heat exchange tube located outside the agitator and a spiral coil arranged around it.

[0006] As a preferred embodiment of this invention, the guide tube is fixedly connected to the bottom of the vessel body via multiple support rods.

[0007] As a preferred technical solution of this utility model, the stirring paddle is at least one layer of inclined blades, and the installation angle of the inclined blades is configured to drive the material to flow upward from the bottom of the guide tube or downward from the top.

[0008] As a preferred technical solution of this utility model, the stirring paddle includes two layers of inclined blades arranged vertically, wherein the upper layer of inclined blades drives the material to flow downward and the lower layer of inclined blades drives the material to flow upward, so as to form a strong local circulating shear zone inside the guide tube.

[0009] As a preferred technical solution of this utility model, the frame-type wall scraper includes a scraper that matches the shape of the inner wall of the vessel and a flexible scraper blade that contacts the inner wall of the vessel on one side of the scraper. The scraper is fixedly connected to the stirring shaft through a connecting rod, and the stirring shaft is supported and positioned by bearings with the fixed guide tube.

[0010] As a preferred technical solution of this utility model, the lower part of the side wall of the guide tube is provided with a through hole or strip-shaped opening that allows the exchange of materials inside and outside the tube.

[0011] As a preferred technical solution of this utility model, the central heat exchange tube and the spiral coil are fixedly connected to the inside of the guide tube through a detachable snap-fit ​​frame.

[0012] As a preferred technical solution of this utility model, the inlet and outlet pipes of the central heat exchange tube and the spiral coil both extend through the guide tube wall and the top of the vessel to the outside of the vessel.

[0013] The advantages of this utility model compared with the prior art are as follows: 1. High-efficiency heat transfer synergy: The jacketed heat exchanger and the internal heat exchange components (central heat exchange tube + spiral coil) form a dual heat exchange system of "external indirect + internal direct", which greatly increases the heat exchange area (30%-50% higher than the traditional jacket), solves the problem of large temperature gradient inside the vessel, and ensures uniform temperature of the reaction system. 2. Powerful shear mixing: The design of two layers of counter-clockwise oblique blades creates a radial circulating shear zone inside the guide tube, which enhances the dispersion and collision of materials and improves the reaction conversion rate of dispersant monomers (15%-20% higher than traditional single blades). 3. Automatic self-cleaning: The flexible scraper blades of the frame scraper rotate with the stirring shaft, continuously scraping away the scale on the inner wall of the vessel, avoiding the decrease in heat transfer efficiency caused by scale buildup and reducing the frequency of downtime for cleaning. 4. High reliability and easy maintenance: The internal heat exchange components are fixed by a detachable snap-fit ​​frame, which makes it easy to replace or clean the heat exchange tubes; the guide tube is fixed by a support rod, which has a simple structure and high strength, extending the service life of the equipment. Attached Figure Description

[0014] Figure 1 This is an overall structural diagram of a heat exchange stirring reactor for dispersant synthesis according to the present invention.

[0015] Figure 2 This is a cross-sectional three-dimensional structural view of a heat exchange stirring reactor for dispersant synthesis according to the present invention.

[0016] Figure 3 This is a schematic diagram of the stirring shaft connection structure of a heat exchange stirring reactor for dispersant synthesis according to this utility model.

[0017] Figure 4 This is a structural diagram of the guide tube of a heat exchange stirring reactor for dispersant synthesis according to this utility model.

[0018] As shown in the figure: 1. Vessel body; 2. Drive motor; 3. Stirring shaft; 4. Jacket; 5. Cooling medium inlet; 6. Cooling medium outlet; 7. Guide tube; 8. Stirring paddle; 9. Agitator; 10. Central heat exchange tube; 11. Spiral coil; 12. Support rod; 13. Scraper; 14. Flexible scraper; 15. Connecting rod; 16. Bearing; 17. Strip-shaped inlet; 18. Snap-fit ​​frame. Detailed Implementation

[0019] 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.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Example 1: As per the instruction manual Figure 1-4As shown, a heat exchange stirring reactor for dispersant synthesis includes a reactor body 1, a drive motor 2 mounted on the top of the reactor body 1, and a stirring shaft 3 extending into the reactor body 1. A jacket 4 is provided on the outside of the reactor body 1, and a cooling medium inlet 5 and a cooling medium outlet 6 are provided on the jacket 4. The reactor body 1 is made of 316L stainless steel, and the inner wall is polished (roughness Ra≤0.8μm) to reduce material adhesion. The top of the reactor body 1 has a feed inlet, and the bottom side has a discharge outlet. The jacket 4 is welded to the outer wall of the reactor body 1, and the gap between the jacket 4 and the reactor body 1 is filled with heat transfer oil or cooling water. The cooling medium inlet 5 is located at the lower part of the jacket 4, and the outlet is located at the upper part of the jacket 4. A countercurrent heat exchange method is used to improve the heat exchange efficiency.

[0022] In this embodiment, the guide tube 7 is a cylindrical stainless steel cylinder, which is welded and fixed to the bottom of the vessel body 1 by 6 symmetrically distributed Q235 steel support rods 12. The height of the guide tube 7 accounts for 1 / 3 to 2 / 3 of the height of the vessel body 1, and 20 elongated openings 17 are provided on the lower part of the side wall for low-resistance exchange of materials inside and outside the tube.

[0023] In this embodiment, the drive motor 2 is a variable frequency motor, connected to the stirring shaft 3 via a coupling. The stirring shaft 3 has an adjustable speed (50-300 rpm). The stirring paddle 8 consists of two layers of inclined blades, each with 6 blades. The blade width is 1 / 10 to 1 / 8 of the diameter of the guide tube 7. The upper inclined blade is installed at an angle of 45° (material flows downwards), and the lower inclined blade is installed at an angle of -45° (material flows upwards). The resulting shear rate can reach 1000-2000 s. -1 This meets the high shear requirements of dispersant synthesis.

[0024] In this embodiment, the annular central heat exchange tube 10 is fitted outside the stirring paddle 8, and the spiral coil 11 is arranged around the central heat exchange tube 10. Both are made of stainless steel. The snap-fit ​​frame 18 is made of aluminum alloy and has a snap-fit ​​groove that matches the central heat exchange tube 10 and the spiral coil 11. It is fixed to the inner wall of the guide tube 7 by bolts. The inlet and outlet pipes of the central heat exchange tube 10 pass through the bottom of the guide tube 7 and extend upward to the top of the vessel body 1, connecting to an external cooling medium source (such as low temperature water or frozen brine) to achieve direct cooling of the material inside the guide tube 7.

[0025] In this embodiment, the scraper 13 is made of stainless steel, and the gap between it and the inner wall of the vessel body 1 is controlled at 2-3mm; the flexible scraper 14 is made of nitrile rubber with a thickness of 3-5mm, and is fixed to the inner side of the scraper 13 by screws; the connecting rod 15 is a stainless steel square rod, one end of which is welded to the scraper 13, and the other end is fixed to the stirring shaft 3 by bolts; the stirring shaft 3 and the guide tube 7 are supported by two radial bearings 16 (located at the upper and lower ends of the guide tube 7) to ensure the coaxiality of the stirring shaft 3.

[0026] Working principle 1. Material circulation and shearing: The drive motor 2 drives the stirring shaft 3 to rotate. The lower inclined blades push the material upward and the upper inclined blades push the material downward. The two form a closed-loop shearing zone inside the guide tube 7, which makes the material fully dispersed and react. The material that does not participate in the reaction enters the outer area of ​​the tube through the through hole on the side wall of the guide tube 7, and then returns to the guide tube 7 from the flow in the outer area, forming an overall circulation.

[0027] 2. Dual heat exchange control: The cooling medium in the jacket 4 reduces the overall temperature of the vessel body 1 through indirect heat exchange; the central heat exchange tube 10 and spiral coil 11 of the internal heat exchange component are circulated with a low-temperature medium to directly absorb the heat released by the reaction inside the guide tube 7, ensuring that the temperature of the reaction system is stable within the set range (such as 50-80℃).

[0028] 3. Automatic self-cleaning: The frame-type scraper rotates synchronously with the stirring shaft 3, and the flexible scraper 14 is in continuous contact with the inner wall of the vessel 1 to scrape off the scale attached to the inner wall, so as to avoid the scale affecting heat transfer and material flow; the scraped material is returned to the reaction zone with the circulation flow, and there is no material waste.

[0029] The present invention and its embodiments have been described above. This description is not restrictive, and the specific embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A heat-exchange stirred reactor for dispersant synthesis, comprising a reactor body (1), a drive motor (2) disposed at the top of the reactor body (1), and a stirring shaft (3) extending into the reactor body (1), characterized in that: The vessel body (1) is provided with a jacket (4) on the outside, and the jacket (4) is provided with a cooling medium inlet (5) and a cooling medium outlet (6). The vessel body (1) is fixedly provided with a flow guide cylinder (7), which divides the internal space of the vessel body (1) into an inner region and an outer region. The stirring shaft (3) passes through the guide tube (7), and is provided with a stirring paddle (8) located inside the guide tube (7) and a stirrer (9) located between the guide tube (7) and the inner wall of the vessel body (1). The stirrer (9) is a frame-type wall scraper. The guide tube (7) is provided with an internal heat exchange assembly, which includes an annular central heat exchange tube (10) located outside the stirring paddle (8) and a spiral coil (11) arranged around it.

2. The heat exchange stirring reaction kettle for dispersant synthesis according to claim 1, characterized in that: The guide tube (7) is fixedly connected to the bottom of the vessel body (1) by multiple support rods (12).

3. The heat exchange stirring reaction kettle for dispersant synthesis according to claim 1, characterized in that: The stirring paddle (8) is at least one layer of inclined blades, and the installation angle of the inclined blades is configured to drive the material to flow upward from the bottom of the guide tube (7) or downward from the top.

4. The heat exchange stirring reaction kettle for dispersant synthesis according to claim 3, characterized in that: The stirring paddle (8) includes two layers of inclined blades arranged vertically, wherein the upper inclined blade drives the material to flow downward and the lower inclined blade drives the material to flow upward, so as to form a strong local circulating shear zone inside the guide tube (7).

5. The heat exchange stirring reaction kettle for dispersant synthesis according to claim 1, characterized in that: The frame-type scraper includes a scraper (13) that matches the shape of the inner wall of the vessel body (1) and a flexible scraper (14) on one side of the scraper (13) that contacts the inner wall of the vessel body (1). The scraper (13) is fixedly connected to the stirring shaft (3) through a connecting rod (15). The stirring shaft (3) and the fixed guide tube (7) are supported and positioned by a bearing (16).

6. The heat exchange stirring reaction kettle for dispersant synthesis according to claim 1, characterized in that: The lower side wall of the guide tube (7) is provided with a through hole or strip opening (17) that allows material exchange between the inside and outside of the tube.

7. The heat exchange stirring reaction kettle for dispersant synthesis of claim 1, characterized in that: The central heat exchange tube (10) and the spiral coil (11) are fixedly connected to the interior of the guide tube (7) via a detachable snap-fit ​​frame (18).

8. The heat exchange stirring reaction kettle for dispersant synthesis according to claim 1, characterized in that: The inlet and outlet pipes of the central heat exchange tube (10) and the spiral coil (11) both extend through the wall of the guide tube (7) and the top of the vessel body (1) to the outside of the vessel body (1).

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