Polymerization stirring device for polyphenylene sulfide
By using a multi-layer axial flow turbine and a radial flow impeller stirring paddle set in the polyphenylene sulfide polymerization and stirring device, combined with the heat exchange device, the problem of uneven mixing and heat transfer during the polymerization process is solved, and the solid phase uniformity is achieved The effective mixing of suspension and polymer improves polymerization efficiency and product performance.
Patent Information
- Application Number
- CN202323414492.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-14
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-14
AI Technical Summary
During the polyphenylene sulfide polymerization process, the phase state changes and viscosity changes of the polymerization system lead to uneven mixing and uneven temperature distribution, which affects the molecular weight and product performance of PPS.
A multi-layer axial flow turbine stirring paddle group and a radial flow impeller stirring paddle group are adopted, combining heat exchange coils and baffles to strengthen the shear performance and heat transfer process to avoid polymer adhesion.
The uniform suspension of the solid phase in the liquid phase and the mixing and heat transfer process of the polymer system are achieved, the polymer adhesion is avoided, and the efficiency and product performance of the PPS polymerization reaction are improved.
Smart Images
Figure CN222240230U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stirring devices, in particular to a polymerization stirring device for polyphenylene sulfide. Background Art
[0002] Polyphenylene sulfide (PPS) has the properties of non-toxicity, high temperature resistance, radiation resistance, flame retardancy, high modulus, high dimensional stability, self-lubrication, and chemical corrosion resistance. It is mainly used in aerospace, electronics, automobiles, chemical equipment, environmental protection and other fields. The main industrial production method for preparing polyphenylene sulfide (PPS) at home and abroad is intermittent operation with gradual heating. Usually, a stirred tank is used as a polymerization device, with parachlorodiphenyl, sodium sulfide or sodium hydrosulfide as raw materials, and N-methylpyrrolidone as a solvent. The PPS polymerization process includes processes such as dissolution of reactants, gradual condensation and precipitation of products. In the early stage of the polymerization reaction, the polymerization system is a solid-liquid system, and the solid phase needs to be evenly suspended in the liquid phase to accelerate the dissolution process of the solid phase in the liquid phase. In the early stage of the polymerization reaction, the polymerization system is a liquid phase system. The condensation reaction of small molecules has a large thermal effect and high heat release, so the requirements for heat transfer are very high. As the polymerization reaction proceeds, the viscosity of the system increases, the solid content increases, the polymerization system is a solid-liquid system, and the generated PPS solid phase particles need to be evenly suspended in the liquid phase. It can be seen that the phase changes of the system during the PPS polymerization process are solid-liquid system, liquid phase system, and solid-liquid system. The temperature and viscosity of the polymerization system first increase and then decrease. During the polymerization reaction, the viscosity of the polymerization system in the kettle is 0.8-5Pa`s. High-viscosity materials are easy to adhere to the surface of the kettle wall and internal components, resulting in uneven mixing and uneven temperature distribution in the kettle, which in turn affects the PPS molecular weight, molecular weight distribution and product performance. Therefore, the design of the PPS polymerization kettle agitator is crucial, and it is necessary to consider the requirements of polymer system phase change, viscosity change, mixing and heat transfer. Utility Model Content
[0003] 1. Technical issues to be resolved
[0004] The utility model solves the problems in the related art and proposes a polymerization stirring device for polyphenylene sulfide. The upper stirring paddle group is a multi-layer axial flow turbine stirring paddle and all of them rotate in a downward pressure manner. The lower stirring paddle group is a radial flow impeller. The radial flow impeller is composed of at least two blades, each blade is composed of a folded edge plate and a straight edge plate, and the folded edge plate can increase the discharge of the radial flow. The first stirring paddle group has good shear performance and axial circulation performance, and the second stirring paddle group has good shear performance and radial circulation performance. The combined stirring paddle can promote the uniform suspension of the solid phase in the liquid phase, strengthen the mixing process and heat transfer process of the polymer system, and avoid the possibility of polymer adhesion in the kettle, so it is suitable for the polymerization reaction process of polyphenylene sulfide.
[0005] (II) Technical solution
[0006] In order to solve the above technical problems, the utility model is implemented through the following technical solutions: a polymerization stirring device for polyphenylene sulfide, comprising a reduction motor, a stirring tank and a stirrer, the stirrer is driven by the reduction motor and is located in the stirring tank, the stirrer comprises a stirring shaft, a first stirring paddle group and a second stirring paddle group, the first stirring paddle group and the second stirring paddle group are both connected to the stirring shaft and are respectively installed on the upper and lower layers of the stirring shaft, the first stirring paddle group comprises at least two layers of axial flow turbine propellers and the axial flow turbine propellers are downward pressure rotating, the second stirring paddle group comprises a layer of radial flow stirring paddles, the radial flow stirring paddles are composed of at least two blades and each blade is composed of a folded edge plate and a straight edge plate, and the angle between the folded edge plate and the straight edge plate is 95 to 175°.
[0007] As a preferred solution, the number of blades of each layer of the axial-flow turbine impeller is 2 to 8 and the inclination angle of the blades is 5 to 85°.
[0008] As a preferred embodiment, the radial flow impeller has 2 to 8 blades.
[0009] As a preferred solution, a heat exchange coil and a baffle are provided inside the stirring tank, the heat exchange coil is located between the baffle and the stirrer, and the number of the baffles is 2 to 8.
[0010] As a preferred solution, a heat exchange jacket is arranged outside the stirring tank, a heat exchange medium flows inside the heat exchange jacket, and a guide plate is arranged inside the heat exchange jacket.
[0011] (III) Beneficial effects
[0012] Compared with the prior art, the utility model has the following beneficial effects: the upper stirring paddle group of the utility model is a multi-layer axial flow turbine stirring paddle and all of them rotate in a downward pressure manner; the lower stirring paddle group is a radial flow impeller, which is composed of at least two blades, each blade is composed of a folded edge plate and a straight edge plate, the folded edge plate can increase the discharge of the radial flow, and the distance between the folded edge plate and the inner wall of the stirring tank is very small, which can enhance the shear performance and the heat transfer process; the first stirring paddle group has good shear performance and axial circulation performance, and the second stirring paddle group has good shear performance and radial circulation performance; the combined stirring paddle can promote the uniform suspension of the solid phase in the liquid phase, enhance the mixing process and heat transfer process of the polymer system, and avoid the possibility of polymer adhesion in the kettle, and is therefore suitable for the polymerization reaction process of polyphenylene sulfide. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0014] Figure 2 This is a schematic diagram of the structure of the agitator in Example 1 of the utility model;
[0015] Figure 3 It is a schematic diagram of the structure of the agitator in Example 2 of the utility model.
[0016] In the figure:
[0017] 1. reduction motor, 2. stirring tank, 3. heat exchange coil, 4. baffle, 5. heat exchange jacket, 6. stirrer, 61. stirring shaft, 62. first stirring paddle group, 63. second stirring paddle group. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0021] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0022] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0023] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0024] Example 1
[0025] like Figures 1 to 2As shown, a polymerization stirring device for polyphenylene sulfide includes a reduction motor 1, a stirring tank 2 and a stirrer 6. The stirrer 6 is driven by the reduction motor 1 and is located in the stirring tank 2. The stirrer 6 includes a stirring shaft 61, a first stirring paddle group 62 and a second stirring paddle group 63. The first stirring paddle group 62 and the second stirring paddle group 63 are both connected to the stirring shaft 61 and are respectively installed on the upper layer and the lower layer of the stirring shaft 61; the first stirring paddle group 62 includes 3 layers of axial flow turbine paddles and the axial flow turbine paddles are downward pressure type. Rotation, each layer of axial-flow turbine impeller has 4 blades and the inclination angle of the blades of the axial-flow turbine impeller is 45°; the second stirring impeller group 63 includes a layer of radial-flow stirring impeller, the radial-flow stirring impeller is composed of 2 blades, the angle between the blades is 180°, each blade is composed of a folded edge plate 631 and a straight edge plate 632, the angle between the folded edge plate 631 and the straight edge plate 632 is 135°, the distance between the folded edge plate 631 and the inner wall of the stirring tank 2 is small, which can enhance the shear performance and heat transfer process.
[0026] A heat exchange coil 3 and a baffle 4 are arranged inside the stirring tank 2. The heat exchange coil 3 is located between the baffle 4 and the stirrer 6. There are four baffles 4, which can enhance the axial flow.
[0027] A heat exchange jacket 5 is arranged outside the stirring tank 2, a heat exchange medium is passed through the heat exchange jacket 5, and a guide plate is arranged inside the heat exchange jacket 5, which can enhance the heat exchange effect and improve the heat exchange efficiency.
[0028] Example 2
[0029] like Figure 3 As shown, different from Example 1, in this embodiment, the first stirring paddle group 62 is a 4-layer axial-flow turbine propeller, and the axial-flow turbine propeller rotates in a downward pressure manner, each layer of the axial-flow turbine propeller has 4 blades, and the inclination angle of the blades of the axial-flow turbine propeller is 45°; the second stirring paddle group 63 includes a layer of radial-flow stirring paddle, and the radial-flow stirring paddle is composed of 4 blades, and the phase angle between two adjacent blades is 90°, and each blade is composed of a folded edge plate 631 and a straight edge plate 632, and the angle between the folded edge plate 631 and the straight edge plate 632 is 120°.
[0030] The above are preferred implementation modes of the present invention. Technicians in the field to which the present invention belongs can also change and modify the above implementation modes. Therefore, the present invention is not limited to the above specific implementation modes. Any obvious improvements, substitutions or modifications made by technicians in this field on the basis of the present invention belong to the protection scope of the present invention.
Claims
1. A polymerization stirring device for polyphenylene sulfide, comprising a reduction motor (1), a stirring tank (2) and a stirrer (6), wherein the stirrer (6) is driven by the reduction motor (1) and is located in the stirring tank (2), and is characterized in that: The stirrer (6) comprises a stirring shaft (61), a first stirring paddle group (62) and a second stirring paddle group (63); the first stirring paddle group (62) and the second stirring paddle group (63) are both connected to the stirring shaft (61) and are respectively mounted on the upper layer and the lower layer of the stirring shaft (61); the first stirring paddle group (62) comprises at least two layers of axial-flow turbine paddles, and the axial-flow turbine paddles rotate in a downward pressure manner; the second stirring paddle group (63) comprises a layer of radial-flow stirring paddles, the radial-flow stirring paddles are composed of at least two blades, and each blade is composed of a folded edge plate (631) and a straight edge plate (632); the angle between the folded edge plate and the straight edge plate is 95-175°.
2. The polymerization stirring device for polyphenylene sulfide according to claim 1, characterized in that: The number of blades of each layer of the axial-flow turbine impeller is 2 to 8 and the inclination angle of the blades is 5 to 85 degrees.
3. The polymerization stirring device for polyphenylene sulfide according to claim 1, characterized in that: The number of blades of the second stirring paddle group (63) is 2 to 8.
4. The polymerization stirring device for polyphenylene sulfide according to claim 1, characterized in that: A heat exchange coil (3) and a baffle (4) are arranged inside the stirring tank (2); the heat exchange coil (3) is located between the baffle (4) and the stirrer (6); and the number of the baffles is 2 to 8.
5. The polymerization stirring device for polyphenylene sulfide according to claim 1, characterized in that: A heat exchange jacket (5) is arranged outside the stirring tank (2), a heat exchange medium flows inside the heat exchange jacket (5), and a guide plate is arranged inside the heat exchange jacket (5).