Closed automatic feeding device for polyester resin preparation
By using a closed-loop automatic feeding device with negative pressure suction and vacuum pipeline system, the safety hazards and environmental problems of adding high-temperature acidic raw materials in the traditional polyester resin preparation are solved, realizing an efficient and safe material addition process, and improving product quality and operational safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-04-10
AI Technical Summary
The addition of high-temperature acidic raw materials in the traditional polyester resin preparation process poses safety hazards, is time-consuming and labor-intensive, and affects product quality. In particular, the pouring operation of hexahydrophthalic anhydride is extremely harmful to human health, and the release of VOCs affects air quality.
The system employs a closed-loop automatic feeding device, utilizing negative pressure suction technology and a vacuum pipeline system. It connects the reactor and raw material tank via flexible tubing, controls valves to regulate the flow of materials and exhaust gas, ensures sealing and exhaust gas collection, and reduces manual operation and VOC leakage.
It improved production efficiency, reduced operational risks, ensured the stability of the chemical reaction environment and product quality, and reduced harm to human health and environmental pollution.
Smart Images
Figure CN224100663U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the preparation process improvement technical field of polyester resin, and particularly relates to a closed automatic feeding device for polyester resin preparation. BACKGROUND
[0002] In the traditional polyester resin preparation process, especially when adding high-temperature acidic raw materials such as hexahydrophthalic anhydride to the reaction kettle, the material is a barrel of raw material (200KG / barrel), which needs to be melted in an oven at 120 degrees and then put into the kettle. The original feeding method is: the melted raw material is transported to the funnel, and a barrel is poured into the kettle using a barrel pouring vehicle, and the kettle temperature is ensured to be about 100 degrees. Because of its high temperature and strong corrosive and irritating nature, it can cause certain harm to personnel during the pouring process, and it is time-consuming and laborious to operate, and there is a high risk of burns. The kettle is at high temperature, and the funnel valve is opened for a long time to load, VOC escapes from the kettle, and air enters the kettle, which has a certain impact on product quality.
[0003] This operation is not only time-consuming and laborious, but also has a high safety risk, because hexahydrophthalic anhydride needs to be melted at 120 degrees before being poured into the reaction kettle. In this process, due to its strong corrosive and irritating nature, it is easy to cause harm to the operator. In addition, long-term opening of the funnel valve for loading operation not only makes it difficult to maintain the temperature in the reaction kettle at the ideal state (about 100℃), but also causes volatile organic compounds (VOC) to escape into the environment, affecting the surrounding air quality. At the same time, the mixing of external air may also interfere with the chemical reaction process and affect the quality of the final product. Therefore, how to improve this process to make it safer, more efficient and environmentally friendly has become a technical problem to be solved. In view of these problems, the present application proposes an innovative solution to fundamentally solve the above challenges by introducing a closed automatic feeding system. UTILITY MODEL CONTENT
[0004] In order to overcome the shortcomings of the prior art, the purpose of the present utility model is to provide a safer, more efficient and more environmentally friendly method for adding high-temperature acidic raw materials in the preparation of polyester resin, while improving the working conditions and protecting the health of the operator.
[0005] To solve the above problems, the technical scheme adopted by the utility model is as follows: a closed automatic feeding device for polyester resin preparation, comprising:
[0006] Compared with the prior art, the utility model discloses the beneficial effect lies in: through adopting negative pressure suction material technology, the joining time of every barrel raw material is greatly shortened, and the production efficiency is improved, and the optimized automatic feeding process reduces the demand to manpower, and reduces the physical burden and risk of manual pouring, simultaneously also avoided the risk that operating personnel directly contacted high temperature corrosive material, reduced the possibility of scald and other injuries, and through preventing air from entering the reaction kettle and preventing VOC from escaping, the stability of chemical reaction environment is ensured, thereby improve the quality of product.
[0007] The feeding device, the soft pipe is made of corrosion-resistant material.
[0008] The feeding device further includes a hopper, and the hopper is fixed above the reaction kettle.
[0009] The feeding device, the vacuum pipeline can extract waste gas from the second waste gas pipe and guide the waste gas to the first waste gas pipe, so that the waste gas can be effectively collected.
[0010] The feeding device, the opening and closing device is a first valve, and the first valve is used to control the discharge rate of waste gas in the reaction kettle.
[0011] The feeding device, a second valve is arranged between the hopper and the reaction kettle, and the second valve is used to prevent VOC from escaping.
[0012] The feeding device, a third valve is arranged between the soft pipe and the raw material barrel, and the third valve is used to control the rate of the hexahydrophthalic anhydride entering the reaction kettle.
[0013] The feeding device, the vacuum pipeline can provide a reduced pressure inside the reaction kettle, so that a negative pressure state is formed between the reaction kettle and the raw material barrel.
[0014] The feeding device, the depth of the soft pipe inserted into the inside of the raw material barrel is greater than or equal to two-thirds of the height of the raw material barrel.
[0015] The feeding device, the third valve is located on one side of the reaction kettle. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the automatic feeding device structure schematic view of the utility model embodiment;
[0017] REFERENCE SIGNS: 100 reaction kettle, 200 stirring motor, 300 pipeline, 310 first waste gas pipe, 320 second waste gas pipe, 330 vacuum pipeline, 400 raw material barrel, 500 soft pipe, 600 opening and closing device, 700 hopper, 710 second valve, 510 third valve. DETAILED DESCRIPTION
[0018] The embodiments of the present application will be described in detail below with reference to the drawings. Figure 1 The embodiments of the present application provide a closed automatic feeding device for polyester resin preparation, comprising: a reaction kettle 100, a stirring motor 200, a pipeline 300 and a raw material barrel 400, the stirring motor 200 is arranged above the reaction kettle 100, the pipeline 300 comprises a first waste gas pipe 310 and a second waste gas pipe 320, a vacuum pipeline 330 is arranged between the first waste gas pipe 310 and the second waste gas pipe 320, an opening and closing device 600 is arranged between the second waste gas pipe 320 and the reaction kettle 100, the raw material barrel 400 is located at one side of the reaction kettle 100, the raw material barrel 400 and the reaction kettle 100 are connected through a flexible pipe 500, the pressure in the reaction kettle 100 is 400 Torr, and the temperature is 100 DEG C, the rotating speed of the stirring motor 200 is adjusted to ensure that the working temperature of pexane is kept below the sublimation temperature. By adopting the negative pressure feeding technology, the feeding time of each barrel of raw material is greatly shortened, the production efficiency is improved, the optimized automatic feeding process reduces the demand for labor, reduces the physical burden and risk caused by manual feeding, avoids the risk that the operator directly contacts high-temperature corrosive materials, reduces the possibility of scalding and other injuries, and ensures the stability of the chemical reaction environment by preventing air from entering the reaction kettle 100 and preventing VOC from escaping, thereby improving the quality of the product.
[0019] Further, the automatic feeding device proposed in the present application is used for closed operation in the polyester resin preparation process. By integrating the reaction kettle 100, the stirring motor 200, the exhaust gas pipeline system, and the raw material barrel 400 and other components, an efficient and environmentally friendly operation process is realized. The stirring motor 200 arranged above the reaction kettle 100 ensures uniform mixing of the materials, while the vacuum pipeline 330 arranged between the first exhaust gas pipe 310 and the second exhaust gas pipe 320 effectively extracts and guides the exhaust gas to the collection point, reducing environmental pollution. The soft tube 500 connects the raw material barrel 400 and the reaction kettle 100, which not only facilitates material transfer but also ensures the sealing of the system. The device can operate at a pressure of 400 Torr and a temperature of 100°C, while adjusting the speed of the stirring motor 200 to control the working temperature of hexahydrophthalic anhydride below its sublimation point, thereby avoiding unnecessary chemical changes or losses, improving product purity and yield. Further, the feeding device proposed in the present application also includes a hopper 700, which is fixed above the reaction kettle 100. The design of the hopper 700 fixed above the reaction kettle 100 greatly simplifies the addition process of solid or liquid materials, making the operation more convenient and safe. This design allows precise control of the material addition speed, which is particularly important for chemical reactions that require strict monitoring of the feeding rate. In addition, the presence of the hopper 700 can also prevent external pollutants from entering the reaction system, maintaining the purity of the reaction environment. In particular, when dealing with toxic or volatile substances, this feature is particularly critical, as it helps to protect the safety of operating personnel and reduce the impact on the environment. Of course, the present application does not limit the specific shape and structure of the hopper 700, and preferably, the hopper 700 is fixed to one side of the reaction kettle 100, facilitating the feeding operation. Further, a second valve 710 is provided between the hopper 700 and the reaction kettle 100, which is used to prevent VOC from escaping. This step is crucial for protecting the working environment and the health of employees. VOC not only poses a threat to human health, but is also one of the important factors causing air pollution. By installing the second valve 710, the leakage of these harmful substances can be effectively prevented, creating a safer working space.
[0020] Further, the vacuum pipeline 330 can extract the exhaust gas from the second exhaust pipe 320 and guide it to the first exhaust pipe 310, so that the exhaust gas can be effectively collected. One function of the vacuum pipeline 330 is to extract the exhaust gas from the second exhaust pipe 320 and guide it to the first exhaust pipe 310, achieving effective collection of the exhaust gas. This way not only can significantly reduce the possibility of harmful gas directly discharged into the atmosphere, but also is conducive to subsequent centralized treatment of exhaust gas, reducing the risk of environmental pollution. By optimizing the flow direction of the exhaust gas, the energy efficiency of the entire system can also be improved, such as using the heat energy in the exhaust gas for preheating or other purposes, and of course the vacuum pipeline 330 can provide a lower pressure inside the reaction kettle 100, forming a negative pressure state between the reaction kettle 100 and the raw material barrel 400. The vacuum pipeline 330 not only takes charge of the extraction and guidance of the exhaust gas, but also actively reduces the pressure inside the reaction kettle 100, forming a negative pressure state between it and the raw material barrel 400. This negative pressure environment is conducive to promoting the smooth flow of raw materials into the reaction kettle 100 and reducing the occurrence of blockage. At the same time, it also enhances the sealing performance of the system, preventing external air or other impurities from mixing in, ensuring the purity of the reaction conditions. More importantly, negative pressure operation helps to improve production safety, especially when handling hazardous chemicals, which can effectively avoid the harm caused by the leakage of harmful substances. Further, the opening and closing device 600 is a first valve, which is used to control the discharge rate of the exhaust gas in the reaction kettle 100. The first valve as the opening and closing device 600 is mainly used to regulate the discharge rate of the exhaust gas in the reaction kettle 100. Precise control of exhaust gas discharge is one of the key steps to maintain the pressure balance inside the reaction kettle 100, which directly affects the speed of chemical reaction, product quality and safety. Proper adjustment of the valve opening can avoid safety hazards caused by excessive pressure, while also ensuring that the exhaust gas can be removed in time and effectively, providing suitable conditions for chemical reactions. Of course, the specific structure of the first valve is not limited in the present application. Further, a third valve 510 is provided between the flexible pipe 500 and the raw material barrel 400, which is used to control the rate of hexahydrophthalic anhydride entering the reaction kettle 100. The third valve 510 is located between the flexible pipe 500 and the raw material barrel 400, and is used to accurately control the rate of hexahydrophthalic anhydride entering the reaction kettle 100. Of course, the specific position of the third valve 510 is not limited in the present application, and preferably, the third valve 510 is located on one side of the reaction kettle 100 to facilitate real-time monitoring and adjustment by the operator. Accurate adjustment of the feed rate is the basis for ensuring the smooth progress of chemical reactions, which affects the quality, yield and production cost of the final product. By manually or automatically adjusting the state of the third valve 510, the feed amount can be flexibly changed according to actual needs to meet the specific requirements of different batches of production. In addition, this design also supports the integration of automatic control systems, improving the overall intelligent level of the production line.
[0021] Further, the depth of the flexible tube 500 inserted into the inside of the raw material barrel 400 is greater than or equal to two-thirds of the height of the raw material barrel 400. Such a design aims to maximize material utilization and reduce residual waste. A longer insertion depth ensures that even when the raw material is close to depletion, the remaining material can be smoothly extracted, improving overall work efficiency. In addition, such a layout is also conducive to maintaining pressure balance inside the raw material barrel 400, avoiding problems caused by local pressure differences.
[0022] It should be noted that in the description of the present application, if there is a reference to the orientation description, such as the orientation or position relationship indicated by the above, below, front, back, left, right, etc. The orientation or position relationship shown in the drawing is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed or operated in a particular orientation, and cannot be understood as a limitation on the present application.
[0023] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two and more than two, greater than, less than, more than, etc. Understand as not including the number, above, below, etc. Understand as including the number. If there is a description of the first or second, etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.
[0024] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. Should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.
[0025] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art on the basis of the present application are within the scope of protection required by the present application.
Claims
1. A closed automatic feeding device for polyester resin production, characterized by, The utility model relates to a kind of six hydrogen phthalic anhydride production device, including: Reaction kettle (100), stirring motor (200), pipeline (300) and raw material barrel (400), stirring motor (200) is equipped above the reaction kettle (100), the pipeline (300) includes first exhaust pipe (310) and second exhaust pipe (320), vacuum pipeline (330) is equipped between first exhaust pipe (310) and second exhaust pipe (320), opening and closing device (600) is equipped between second exhaust pipe (320) and reaction kettle (100), the raw material barrel (400) is located in the side of the reaction kettle (100), the raw material barrel (400) is connected with the reaction kettle (100) by soft pipe (500), the pressure in the reaction kettle (100) is 400Torr, temperature is 100 DEG C, the rotational speed of stirring motor (200) is adjusted, to ensure that the working temperature of six hydrogen phthalic anhydride is kept below its sublimation temperature.
2. The automatic charging device according to claim 1, characterized in that The soft pipe (500) is made of corrosion-resistant material.
3. The automatic charging device according to claim 1, wherein It also includes funnel (700), which is fixed above the reaction kettle (100).
4. The automatic charging device according to claim 1, characterized in that, The vacuum pipeline (330) can extract exhaust gas from the second exhaust pipe (320) and guide the exhaust gas to the first exhaust pipe (310), so that the exhaust gas can be effectively collected.
5. The automatic charging device according to claim 1, wherein The opening and closing device (600) is a first valve, which is used to control the exhaust emission rate of the reaction kettle (100).
6. The automatic charging device according to claim 3, wherein The funnel (700) and the reaction kettle (100) are provided with a second valve (710), which is used to prevent VOC from escaping.
7. The automatic charging device according to claim 1, wherein The soft pipe (500) and the raw material barrel (400) are provided with a third valve (510), which is used to control the rate of six hydrogen phthalic anhydride entering the reaction kettle (100).
8. The automatic charging device according to claim 1, wherein The vacuum pipeline (330) can reduce the pressure inside the reaction kettle (100), so that a negative pressure state is formed between the reaction kettle (100) and the raw material barrel (400).
9. The automatic charging device according to claim 1, wherein The depth of the soft pipe (500) inserted into the raw material barrel (400) is greater than or equal to two-thirds of the height of the raw material barrel (400).
10. The automatic charging device according to claim 7, characterized in that, The third valve (510) is located on the side of the reaction kettle (100).