Reaction vessel for producing polyester polyols

Abstract

This utility model belongs to the field of chemical reaction vessel technology, and particularly relates to a reaction vessel for producing polyester polyols. It includes a hollow vessel body, a first stirrer, a second stirrer, and a cooling device. A stirring motor is located directly above the vessel body, with its drive end extending into the vessel body and connected to a connecting shaft. The connecting shaft coaxially connects the first stirrer and the second stirrer from top to bottom. The cooling device includes a cooling annular cavity surrounding the outside of the connecting shaft, positioned between the first and second stirrers. By using the coaxially connected first and second stirrers, the reaction vessel can synergistically enhance the mixing of materials within the vessel. Simultaneously, by using the cooling annular cavity surrounding the connecting shaft between the first and second stirrers, and utilizing the gap design between the cooling annular cavity and the vessel body and connecting shaft, efficient heat exchange is achieved in the core reaction area, thereby significantly improving the uniformity of the reaction system and the accuracy of temperature control.

Description

Technical Field

[0001] This utility model belongs to the field of chemical reaction vessel technology, and in particular relates to a reaction vessel for producing polyester polyols. Background Technology

[0002] In the production of polyester polyols, the stirring efficiency and temperature control of the reactor directly affect product quality and production efficiency. Traditional reactors typically use a single stirrer, making it difficult to achieve uniform mixing of materials in different areas within the reactor. This is especially true in high-viscosity polyester polyol systems, which can easily lead to uneven local reactions or unbalanced temperature distribution, thus affecting the molecular weight distribution and performance stability of the product. Furthermore, conventional cooling devices often employ jacketed or coiled structures, which have limited cooling efficiency and make it difficult to precisely control the temperature in the reaction zone, especially as temperature gradients can easily form during stirring. Utility Model Content

[0003] The purpose of this invention is to provide a reaction vessel for producing polyester polyols, aiming to solve the technical problems of low cooling efficiency and insufficient compound mixing in the prior art.

[0004] To achieve the above objectives, this utility model provides a reactor for producing polyester polyols, comprising a hollow reactor body, a first stirrer, a second stirrer, and a cooling device. A stirring motor is located directly above the reactor body, with its drive end extending into the reactor body and connected to a connecting shaft. The connecting shaft coaxially connects the first stirrer and the second stirrer sequentially from top to bottom. The cooling device includes a cooling annular cavity surrounding the connecting shaft, with gaps between the cooling annular cavity and both the reactor body and the connecting shaft. The cooling annular cavity is positioned between the first stirrer and the second stirrer.

[0005] Furthermore, the cooling annular cavity adopts a variable diameter enveloping layout, with the upper and lower ends of the cooling annular cavity far away from the connecting shaft, and the middle end of the cooling annular cavity close to the connecting shaft and the inner wall of the vessel.

[0006] Furthermore, one end of a cooling input pipe enters the interior from above the cooling annular cavity, and the other end passes through the vessel body and connects to the outside; one end of a cooling output pipe exits from below the cooling annular cavity, and the other end passes through the vessel body and connects to the outside.

[0007] Furthermore, several sets of cooling input pipes are provided, and the cooling input pipes surround the vessel body.

[0008] Furthermore, the exterior of the cooling annular cavity is fixedly connected to the inner wall of the vessel body via a bracket. Multiple brackets are provided and surround the inner circumference of the vessel body, with gaps between the brackets.

[0009] Furthermore, the vessel body is provided with a confluence wall, the diameter of which decreases sequentially from top to bottom along the axial direction; a first stirrer is provided inside the confluence wall.

[0010] Furthermore, the diameter of the first agitator increases sequentially from top to bottom along the axial direction; the diameter of the second agitator also increases sequentially from top to bottom along the axial direction.

[0011] The above-mentioned one or more technical solutions in the reactor for producing polyester polyols provided in this embodiment of the utility model have at least one of the following technical effects: The reactor of the present invention, by setting a first agitator and a second agitator coaxially connected, can synergistically enhance the mixing of materials in the reactor. At the same time, by setting a cooling annular cavity around the connecting shaft between the first and second agitators, the gap design between the cavity and the reactor body and the connecting shaft can achieve efficient heat exchange in the core reaction area, thereby significantly improving the uniformity of the reaction system and the accuracy of temperature control. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a cross-sectional structural diagram of a reaction vessel for producing polyester polyols, provided as an embodiment of the present invention.

[0014] The following are the labeling elements in the figure: 100. Kettle body; 110. First agitator; 120. Second agitator; 130. Agitator motor; 140. Connecting shaft; 150. Discharge port; 160. Feeding port; 200 Cooling device; 210 Cooling annular cavity; 220 Cooling input pipe; 230 Cooling output pipe; 240 Support; 250 Manifold wall. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below, with examples of the embodiments shown in the appendix. Figure 1 As shown in the figure, the same or similar reference numerals throughout denote the same or similar elements or elements having the same or similar functions. The following is illustrated with reference to the appendix. Figure 1 The described embodiments are exemplary and intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0016] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of 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.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0018] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0019] In one embodiment of this utility model, a reaction vessel for producing polyester polyols is provided, comprising a hollow vessel body 100, a first stirrer 110, a second stirrer 120, and a cooling device 200. A stirring motor 130 is located directly above the vessel body 100, with its drive end extending into the vessel body 100 and connected to a connecting shaft 140. The connecting shaft 140 coaxially connects the first stirrer 110 and the second stirrer 120 sequentially from top to bottom. The cooling device 200 includes a cooling annular cavity 210 surrounding the outside of the connecting shaft 140, with gaps between the cooling annular cavity 210 and both the vessel body 100 and the connecting shaft 140. The cooling annular cavity 210 is positioned between the first stirrer 110 and the second stirrer 120.

[0020] The workflow is as follows: First, the raw materials for polyester polyol (such as polyol, diacid or anhydride, catalyst, etc.) are added into the reactor body 100. The stirring motor 130 is then started, driving the connecting shaft 140 to simultaneously rotate the first stirrer 110 and the second stirrer 120. The first stirrer 110 is primarily responsible for the initial mixing when the material is fed into the reactor body 100, while the second stirrer 120 enhances the rapid mixing of the material at the bottom of the reactor body 100. Together, they improve the overall efficiency of mixing throughout the reactor. During the reaction, a cooling medium (such as cold water) is introduced into the cooling annular cavity 210. The gap between the connecting shaft 140 and the reactor body 100 forms an inlet. The material rapidly cools after passing through the outer wall of the cooling annular cavity 210 and flows into the second stirrer 120 below, maintaining a uniform temperature in the reaction system. Finally, after the reaction is complete, the product is discharged through the outlet 150 at the bottom of the reactor body 100. This process, through the combination of staged stirring and directional cooling, significantly improves reaction efficiency and product quality.

[0021] Furthermore, the cooling annular cavity 210 adopts a variable-diameter enveloping layout. The upper and lower ends of the cooling annular cavity 210 are far from the connecting shaft 140, while the middle end of the cooling annular cavity 210 is close to the connecting shaft 140 and the inner wall of the vessel body 100. The material first flows in from the feed port 160 above the vessel body 100. The material first passes through the upper end of the cooling annular cavity 210. As the middle end of the cooling annular cavity 210 gradually widens to both sides, the flow resistance of the material increases, the flow velocity is restricted and slowed down, and the contact time between the material and the cooling annular cavity 210 is enhanced, resulting in a more direct heat exchange efficiency.

[0022] Furthermore, one end of a cooling input pipe 220 enters the cooling annular cavity 210 from above, and the other end passes through the vessel body 100 and connects to the outside; one end of a cooling output pipe 230 exits the cooling annular cavity 210 from below, and the other end passes through the vessel body 100 and connects to the outside. The cooling medium flows from top to bottom, repeatedly circulating with the aid of gravity to improve cooling efficiency.

[0023] Furthermore, several sets of cooling input pipes 220 are provided, and the cooling input pipes 220 surround the vessel body 100. Multiple sets of cooling input pipes 220 simultaneously deliver cooling medium to the cooling annular cavity 210, improving the uniformity of cooling medium distribution.

[0024] Furthermore, the exterior of the cooling annular cavity 210 is fixedly connected to the inner wall of the vessel body 100 via a bracket 240. The bracket 240 is provided in multiple sets and surrounds the inner circumference of the vessel body 100, with gaps between the brackets 240.

[0025] Furthermore, the vessel body 100 is provided with a confluence wall 250, the diameter of which decreases sequentially from top to bottom along the axial direction; a first agitator 110 is provided inside the confluence wall 250. The confluence wall 250 guides the material to converge downwards, and the material is mixed more effectively with the first agitator 110.

[0026] Furthermore, the diameter of the first agitator 110 increases sequentially from top to bottom along the axial direction; the diameter of the second agitator 120 also increases sequentially from top to bottom along the axial direction. This sequential increase gradually increases the resistance to material flow, restricting and slowing the flow speed, resulting in more uniform mixing.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reaction vessel for producing polyester polyols, characterized in that, The device includes a hollow vessel body, a first stirrer, a second stirrer, and a cooling device. A stirring motor is located directly above the vessel body, and the drive end of the stirring motor extends into the vessel body and is connected to a connecting shaft. The connecting shaft coaxially connects the first stirrer and the second stirrer from top to bottom. The cooling device includes a cooling annular cavity surrounding the outside of the connecting shaft. There are gaps between the cooling annular cavity and the vessel body and the connecting shaft. The cooling annular cavity is located between the first stirrer and the second stirrer.

2. The reactor for producing polyester polyols according to claim 1, characterized in that, The cooling annular cavity adopts a variable diameter enveloping layout. The upper and lower ends of the cooling annular cavity are far away from the connecting shaft, and the middle end of the cooling annular cavity is close to the connecting shaft and the inner wall of the vessel.

3. The reactor for producing polyester polyols according to claim 1, characterized in that, One end of a cooling input pipe enters the interior from above the cooling annular cavity, and the other end passes through the vessel body and connects to the outside; one end of a cooling output pipe exits from below the cooling annular cavity, and the other end passes through the vessel body and connects to the outside.

4. The reactor for producing polyester polyols according to claim 3, characterized in that, The cooling input pipes are provided in several groups and are arranged around the vessel body.

5. The reactor for producing polyester polyols according to claim 1, characterized in that, The cooling annular cavity is fixedly connected to the inner wall of the vessel body via a bracket. Multiple brackets are provided and surround the inner circumference of the vessel body, with gaps between the brackets.

6. The reactor for producing polyester polyols according to claim 1, characterized in that, The vessel body is provided with a confluence wall, the diameter of which decreases sequentially from top to bottom along the axial direction; the first stirrer is provided inside the confluence wall.

7. The reactor for producing polyester polyols according to claim 1, characterized in that, The diameter of the first agitator increases sequentially from top to bottom along the axial direction; the diameter of the second agitator increases sequentially from top to bottom along the axial direction.

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