A polymerization reactor for polystyrene reverse production

Abstract

This utility model discloses a polymerization reactor for polystyrene reverse polymerization, comprising: a reactor body; a stirring shaft rotatably disposed within the reactor body and connected to a drive mechanism, wherein the stirring shaft has a working fluid inflow chamber and a working fluid outflow chamber at its two ends respectively; a spiral plate mounted on the stirring shaft and rotatable with the stirring shaft; and at least one spirally arranged heat exchange tube disposed on the spiral plate, with both ends of the heat exchange tube communicating with the cooling working fluid inflow chamber and the working fluid outflow chamber. The heat exchange tube on the spiral plate is directly immersed in the reactants, achieving full-area heat exchange through forced convection and heat exchange with the material, significantly reducing the temperature difference between the central region and the reactor wall; simultaneously, the rotation of the spiral plate promotes material mixing, avoiding local overheating or uneven reaction; compared to traditional internal cooling pipes, the integrated design of the spiral plate and stirring does not require additional space within the reactor, and the spiral flow reduces polymer adhesion.

Description

Technical Field

[0001] This application relates to chemical or physical methods, such as catalysis and colloid chemistry; and specifically to a polymerization reactor for the reverse production of polystyrene. Background Technology

[0002] In the industrial production of polystyrene, the polymerization reaction of styrene monomer is a strongly exothermic process. Currently, batch reactors (polymerization reactors) are widely used in industry for bulk polymerization or suspension polymerization of styrene, which releases a large amount of heat during the reaction. If the heat of reaction cannot be removed in time, it can lead to excessively high local temperatures, potentially causing problems such as runaway reaction, broadened molecular weight distribution, and increased side reactions.

[0003] Currently, polymerization reactors primarily remove reaction heat through jacketed cooling, which involves installing a jacket on the outer wall of the reactor and exchanging heat via circulating cooling water or thermal oil. However, jacketed cooling can only effectively reduce the temperature in the area near the reactor wall. Heat in the central region of the reactor must be transferred to the wall slowly through conduction and convection, resulting in delayed heat dissipation of the central material. Temperature differences at different locations within the reactor affect the uniformity of the reaction. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a polymerization reactor for polystyrene reverse production, comprising:

[0005] The vessel body;

[0006] A stirring shaft is rotatably mounted inside the vessel and connected to a drive mechanism. The stirring shaft has a working fluid inflow chamber and a working fluid outflow chamber at its two ends, respectively.

[0007] A spiral plate is mounted on the stirring shaft and can rotate with the stirring shaft. The spiral plate is provided with at least one spirally arranged heat exchange tube, and the two ends of the heat exchange tube are connected to the cooling working fluid inflow chamber and the working fluid outflow chamber.

[0008] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the spiral plate is provided with an installation position that matches and passes through the heat exchange tube, and the heat exchange tube is embedded in the installation position and connected and fixed to the spiral plate.

[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the spiral plate is welded to the heat exchange tube.

[0010] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: multiple heat exchange tubes are provided, and the multiple heat exchange tubes are arranged at intervals on the spiral plate.

[0011] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: a central flow channel is provided on the stirring shaft, and the cooling working fluid inflow chamber and the working fluid outflow chamber are respectively connected to the two ends of the central flow channel.

[0012] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the diameters of the cooling working fluid inflow chamber and the working fluid outflow chamber are both larger than the diameter of the central flow channel, and the diameter of the stirring shaft gradually decreases from the working fluid inflow chamber and the working fluid outflow chamber to the central flow channel.

[0013] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: the driving mechanism includes a driving motor, the driving motor is installed on the top of the vessel body, a driving gear is installed on the driving shaft of the driving motor, and a driven gear that meshes with the driving gear is installed on the stirring shaft.

[0014] The beneficial effects of this invention are as follows: the heat exchange tubes on the spiral plate are directly immersed in the reactants, and heat exchange is achieved throughout the entire process through forced convection and heat exchange with the material, which significantly reduces the temperature difference between the central area and the reactor wall; at the same time, the rotation of the spiral plate promotes material mixing and avoids local overheating or uneven reaction; compared with traditional internal cooling tubes, the integrated design of the spiral plate and the agitator does not require additional space inside the reactor, and the spiral flow can reduce polymer adhesion. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of the structure of the polymerization reactor for polystyrene reverse production described in the embodiments of this application;

[0017] Figure 2 This is a cross-sectional view of the polymerization reactor used for polystyrene reverse production as described in the embodiments of this application. Detailed Implementation

[0018] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0019] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figure 1-2 This application presents an embodiment of a polystyrene reverse production polymerization reactor, which includes:

[0023] 10-piece vessel body;

[0024] A stirring shaft 20 is rotatably disposed within the vessel body 10 and connected to the drive mechanism 30. The connecting sections of the stirring shaft 20 are respectively provided with a working fluid inflow chamber 21 and a working fluid outflow chamber 22.

[0025] A spiral plate 40 is mounted on the stirring shaft 20 and can rotate with the stirring shaft 20. At least one spirally arranged heat exchange tube 50 is provided on the spiral plate 40, and the two ends of the heat exchange tube 50 are connected to the cooling working fluid inflow chamber 21 and the working fluid outflow chamber 22.

[0026] The reactor body 10 is equipped with a jacket and a matching jacket cooling system on its side wall. Styrene monomer and initiator are added into the reactor through the feed port. The stirring shaft 20 is started to drive the spiral plate 40 to rotate, and the jacket cooling system is in operation. At the same time, the cooling working fluid flows into the heat exchange tube 50 through the working fluid inflow chamber 21. After the polymerization reaction begins, the rotation of the spiral plate 40 forces the material to flow axially and radially. The heat exchange tube 50 directly contacts the high-temperature material for heat exchange. The cooling working fluid flows in the heat exchange tube 50 and carries away the heat of the material, thereby efficiently removing the heat of reaction.

[0027] The heat exchange tubes 50 on the spiral plate 40 are directly immersed in the reactants, achieving full-area heat exchange through forced convection and heat exchange with the material, significantly reducing the temperature difference between the central area and the reactor wall; at the same time, the rotation of the spiral plate 40 promotes material mixing and avoids local overheating or uneven reaction; compared with traditional internal cooling tubes, the spiral plate 40 is integrated with the stirring design and does not require additional space inside the reactor, and the spiral flow can reduce polymer adhesion.

[0028] Those skilled in the art should know that the stirring shaft 20 is mounted on the upper and lower ends of the vessel body 10 through rotating bearings. Rotary joints are installed at both ends of the stirring shaft 20. The output end of the delivery pump is connected to one end of the stirring shaft 20 through the rotary joint. The other end of the stirring shaft 20 is connected to the inlet of the refrigeration unit through an output pipe. The outlet of the refrigeration unit is connected to the input end of the delivery pump.

[0029] Preferably, the spiral plate 40 is provided with a mounting position that matches and passes through the heat exchange tube 50, and the heat exchange tube 50 is embedded in the mounting position and connected and fixed to the spiral plate 40.

[0030] The heat exchange tube 50 is embedded in the spiral plate 40, which helps to improve the rigidity of the spiral plate 40 and increase its structural strength. At the same time, the heat exchange tube 50 is in direct contact with the spiral plate 40, and the heat exchange tube 50 can exchange heat with the spiral plate 40. The spiral plate 40 can also exchange heat with the material, forming a secondary heat transfer surface and improving the heat exchange effect on the material.

[0031] Referring to the attached drawings, the spiral plate 40 is provided with connecting pipes 41 at both ends, the heat exchange tube 50 is connected to the connecting pipes 41, and the connecting pipes 41 are installed on the stirring shaft 20 and are connected to the interior of the stirring shaft 20.

[0032] Furthermore, the spiral plate 40 is welded to the heat exchange tube 50. This welding connection improves the heat transfer efficiency between the spiral plate 40 and the heat exchange tube 50. The spiral plate 40 and the heat exchange tube 50 are made of the same material, ensuring that their coefficients of thermal expansion are similar.

[0033] Preferably, a plurality of heat exchange tubes 50 are provided, and the plurality of heat exchange tubes 50 are arranged at intervals on the spiral plate 40.

[0034] The number of heat exchange tubes 50 can be arranged according to the diameter of the vessel body 10 and the size of the spiral plate 40. Multiple heat exchange tubes 50 effectively increase the heat exchange area between the material and the vessel body, ensuring the removal of reaction heat.

[0035] Preferably, the stirring shaft is provided with a central flow channel 23, and the cooling working fluid inflow chamber 21 and the working fluid outflow chamber 22 are respectively connected to the two ends of the central flow channel 23.

[0036] Furthermore, the stirring shaft 20 adopts a thick-walled hollow shaft design, with an integrated cooling working fluid circulation channel inside, achieving compact and efficient heat exchange.

[0037] In this embodiment, the diameters of the working fluid inflow chamber 21 and the working fluid outflow chamber 22 are both larger than the diameter of the central flow channel 23, and the diameter of the stirring shaft 20 gradually decreases from the working fluid inflow chamber 21 and the working fluid outflow chamber 22 to the central flow channel 23. This facilitates the distribution of the working fluid in the working fluid inflow chamber 21 to the central flow channel 23 and the heat exchange tube 30, and also facilitates the reflow of the working fluid in the heat exchange tube 30 into the working fluid outflow chamber 22.

[0038] In this embodiment, the driving mechanism 30 includes a driving motor 31, which is mounted on the top of the vessel body 10. A drive gear 32 is mounted on the drive shaft of the driving motor 31, and a driven gear 33 that meshes with the drive gear 32 is mounted on the stirring shaft 20.

[0039] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A polymerization reactor for polystyrene reverse production, characterized in that, include: The vessel body (10); A stirring shaft (20) is rotatably disposed inside the vessel body (10) and connected to a drive mechanism (30). The two ends of the stirring shaft (20) are respectively provided with a working fluid inflow chamber (21) and a working fluid outflow chamber (22). A spiral plate (40) is installed on the stirring shaft (20) and can rotate with the stirring shaft (20). At least one spirally arranged heat exchange tube (50) is provided on the spiral plate (40), and the two ends of the heat exchange tube (50) are connected to the cooling working medium inflow chamber (21) and the working medium outflow chamber (22).

2. The polymerization reactor for polystyrene reverse production according to claim 1, characterized in that, The spiral plate (40) is provided with an installation position that matches and passes through the heat exchange tube (50), and the heat exchange tube (50) is embedded in the installation position and connected and fixed to the spiral plate (40).

3. The polymerization reactor for polystyrene reverse production according to claim 2, characterized in that, The spiral plate (40) is welded to the heat exchange tube (50).

4. The polymerization reactor for polystyrene reverse production according to any one of claims 1-3, characterized in that, The heat exchange tubes (50) are provided in multiple ways, and the multiple heat exchange tubes (50) are arranged at intervals on the spiral plate (40).

5. The polymerization reactor for polystyrene reverse production according to claim 1, characterized in that, The stirring shaft is provided with a central flow channel (23), and the cooling working fluid inflow chamber (21) and the working fluid outflow chamber (22) are respectively connected to the two ends of the central flow channel (23).

6. The polymerization reactor for polystyrene reverse production according to claim 5, characterized in that, The diameters of the cooling working fluid inlet chamber (21) and the working fluid outlet chamber (22) are both larger than the diameter of the central flow channel (23), and the diameter of the stirring shaft (20) gradually decreases from the working fluid inlet chamber (21) and the working fluid outlet chamber (22) to the central flow channel (23).

7. The polymerization reactor for polystyrene reverse production according to claim 1, characterized in that, The drive mechanism (30) includes a drive motor (31), which is mounted on the top of the vessel body (10). A drive gear (32) is mounted on the drive shaft of the drive motor (31), and a driven gear (33) that meshes with the drive gear (32) is mounted on the stirring shaft (20).

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