A polycondensation reactor
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU RUIYA MIXING TECH CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-07-14
Smart Images
Figure CN224485997U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polycondensation reaction technology, and in particular to a polycondensation reactor. Background Technology
[0002] Polyesters can be classified into high molecular weight and low molecular weight polyesters based on their molecular weight. Polyester plasticizers are oligomers prepared by the polycondensation reaction of saturated polybasic acids and polyols, with molecular weights generally between 800 and 8000 g / mol. Compared with small molecule plasticizers, polyester plasticizers have characteristics such as low volatility, migration resistance, aging resistance, and high temperature resistance. Based on the structure of the terminal groups, polyester plasticizers can be classified into acid-terminated, alcohol-terminated, and unterminated types. Based on molecular weight, polyester plasticizers are divided into high, medium, and low molecular weight categories. Based on the type of dibasic acid, commonly used polyester plasticizers include glutaric acid, adipic acid, azelaic acid, and sebacic acid.
[0003] The preparation process of polyester plasticizers includes raw material mixing, esterification reaction, and polycondensation reactor. First, diols and diacids are mixed. Diols are typically in the liquid phase, while diacids are typically in the solid phase; therefore, the diacid needs to be uniformly suspended in the liquid system to accelerate mixing and dissolution. Next, the diol and diacid undergo esterification, resulting in a high monomer conversion rate and low system viscosity. Finally, the oligomers undergo polycondensation to generate polymers with higher molecular weights. The system viscosity gradually increases, and since polycondensation is a reversible equilibrium reaction, the generated small molecule compounds need to be removed from the system promptly for the reaction to proceed in the direction of increasing molecular weight. The process of preparing polyester plasticizers involves a transition from a solid-liquid to a liquid phase, with a gradual increase in viscosity, which restricts the flow, mixing, and heat transfer processes. Utility Model Content
[0004] This invention solves the problems in related technologies and proposes a polycondensation reactor. The upper impeller is an axial flow impeller with downward rotating motion, which has excellent axial circulation performance. The lower impeller is a radial flow impeller and an anchor impeller supported by two inclined support rods, which has excellent solid-liquid suspension performance and heat transfer performance. This combined impeller of the present invention has excellent circulation performance and can promote the flow, mixing and heat transfer processes of the polycondensation reaction system.
[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a polycondensation reactor, including a vessel body and a stirrer placed inside the vessel body. The stirrer includes a stirring shaft, a first stirring blade and a second stirring blade. The first stirring blade is located in the upper layer of the vessel body and is an axial flow stirring blade that rotates downwards. The second stirring blade is located in the lower layer of the vessel body and is an anchor-type stirring blade supported by two inclined support rods.
[0006] As a preferred embodiment, the first stirring impeller has two layers, with each layer having 2 to 6 blades and the blades having an inclination angle of 5 to 85°.
[0007] As a preferred embodiment, the anchor-type agitator is installed at the bottom of the agitator shaft and connected to the agitator shaft on both sides by inclined support rods.
[0008] As a preferred embodiment, the interior of the vessel is also provided with baffles, and the number of baffles is 2 to 6.
[0009] As a preferred embodiment, the vessel body is provided with a heat exchange jacket on the outside and a heat exchange coil on the inside.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The upper stirring paddle of this utility model is an axial flow stirring paddle with downward rotation, which has excellent axial circulation performance; the lower stirring paddle is a radial flow stirring paddle and an anchor-type stirring paddle supported by two inclined support rods, which has excellent solid-liquid suspension performance and heat transfer performance; this combined stirring paddle of this utility model has excellent circulation performance, which can promote the flow, mixing process and heat transfer process of the polycondensation reaction system; a heat exchange jacket is set on the outside of the vessel body, and a heat exchange coil is also set inside the vessel body to increase the heat exchange area and enhance the heat exchange process, so as to ensure the uniform temperature distribution during the reaction process. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0012] Figure 2 This is a schematic diagram of the structure of the stirrer of this utility model.
[0013] In the picture:
[0014] 1. Vessel body; 2. Agitator; 21. Agitator shaft; 22. First agitator; 23. Second agitator; 231. Support rod; 232. Anchor agitator; 3. Baffle; 4. Heat exchange jacket; 5. Heat exchange coil. Detailed Implementation
[0015] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0016] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0017] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0018] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.
[0019] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0020] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0021] like Figures 1 to 2 As shown, a polycondensation reactor includes a vessel body 1 and a stirrer 2 placed inside the vessel body 1. The stirrer 2 can be rotated by a motor. The stirrer 2 includes a stirring shaft 21, a first stirring blade 22 and a second stirring blade 23. The first stirring blade 22 is located in the upper layer of the vessel body 1. The first stirring blade 22 is an axial flow stirring blade and rotates in a downward pressure manner. The second stirring blade 23 is located in the lower layer of the vessel body 1. The second stirring blade 23 is a radial flow stirring blade, specifically an anchor-type stirring blade 232 supported by two inclined support rods 231.
[0022] In one embodiment, the first stirring paddle 22 has two layers and each layer has four blades, with the blades tilted at an angle of 45°.
[0023] In one embodiment, the anchor-type stirring paddle 232 is installed at the bottom of the stirring shaft 21 and connected to the stirring shaft 21 on both sides by inclined support rods 231.
[0024] In one embodiment, the interior of the vessel body 1 is further provided with baffles 3, and the number of baffles 3 is four, in order to increase the turbulence of the internal fluid and improve the stirring effect.
[0025] In one embodiment, due to the large amount of heat exchanged during the polycondensation reaction, in order to control the uniform temperature distribution during the reaction, a heat exchange jacket 4 is provided not only outside the vessel body 1, but also inside the vessel body 1.
[0026] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.
Claims
1. A polycondensation reactor, comprising a vessel body (1) and a stirrer (2) disposed within the vessel body (1), characterized in that: The stirrer (2) includes a stirring shaft (21), a first stirring blade (22) and a second stirring blade (23). The first stirring blade (22) is located on the upper layer of the vessel body (1). The first stirring blade (22) is an axial flow stirring blade and rotates in a downward pressure manner. The second stirring blade (23) is located on the lower layer of the vessel body (1). The second stirring blade (23) is an anchor-type stirring blade (232) supported by two inclined support rods (231).
2. The polycondensation reactor according to claim 1, characterized in that: The first stirring paddle (22) has two layers and each layer has 2 to 6 blades, with the blades tilted at an angle of 5 to 85°.
3. The polycondensation reactor according to claim 1, characterized in that: The anchor-type stirring paddle (232) is installed at the bottom of the stirring shaft (21) and is connected to the stirring shaft (21) on both sides by inclined support rods (231).
4. The polycondensation reactor according to claim 1, characterized in that: The interior of the vessel body (1) is also provided with baffles (3), and the number of baffles (3) is 2 to 6.
5. The polycondensation reactor according to claim 1, characterized in that: The vessel body (1) is provided with a heat exchange jacket (4) on the outside and a heat exchange coil (5) inside.