Polymer vacuum devolatilization device

Abstract

The utility model discloses a polymer vacuum devolatilization device, which belongs to the technical field of devolatilization devices and comprises a feed pipe, the bottom of the feed pipe is communicated with a heating devolatilization area, the bottom of the heating devolatilization area is communicated with a preheater, the bottom of the preheater is communicated with a vacuum devolatilization tank, and one side of the vacuum devolatilization tank is communicated with a recovery mechanism. And the bottom of the vacuum devolatilization tank is communicated with a collection box. The feeding hole is used for introducing a polymer material to be devolatilized into the heating devolatilization area, the polymer flows through the heating tube nest in the heating devolatilization area and is devolatilized while being heated so as to reach the temperature required by devolatilization, and the polymer is rapidly and uniformly heated to the temperature close to the devolatilization temperature through the preheater, so that the risk of local overheating for damaging molecular chains is reduced, and the devolatilization effect is improved. A negative pressure environment is established through the vacuum devolatilization tank, volatile components in the polymer are extracted, and the volatile components are cooled and discharged through the condenser, so that the boiling point of the volatile components can be reduced, the energy consumption can be reduced, and the devolatilization efficiency can be improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of devolatilization devices, and particularly relates to a polymer vacuum devolatilization device. Background Technology

[0002] Polymer devolatilization is a process that separates low-molecular-weight components from molten polymers. These low-molecular-weight components mainly include unreacted monomers, solvents, moisture, and various polymerization byproducts. The presence of these low-molecular-weight components can affect the properties of polymers (such as adhesive resins like hot melt adhesives). Devolatilization can remove odors and recover monomers, meeting health and environmental protection requirements.

[0003] A prior art devolatilization device (CN201520783078.5) is disclosed, including a devolatilization tower, a feed inlet, a discharge outlet, and a volatile matter outlet. The devolatilization tower has one or more packing layers, a material distributor at the top, and a steam nozzle at the bottom. The devolatilization device of this invention has a packing layer, which ensures a sufficiently large specific surface area for the material and allows the liquid to have sufficient time for devaporization within the tower, thus greatly improving the devaporization efficiency. Although the above solution solves the corresponding technical problem, the above technical example still has the following drawback: when cooling and discharging the volatile matter, it is easy to cause reflux of the volatile matter, thereby affecting the stable operation of the device. Utility Model Content

[0004] The purpose of this invention is to provide a polymer vacuum devolatilization device to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a polymer vacuum devolatilization device, including a feed pipe, the bottom of which is connected to a heating devolatilization zone, the bottom of which is connected to a preheater, the bottom of which is connected to a vacuum devolatilization tank, one side of which is connected to a recycling mechanism, and the bottom of which is connected to a collection box.

[0006] Preferably, the recovery mechanism includes a gas phase collector connected to the vacuum devolatilization tank. The gas phase collector is connected to the vacuum devolatilization tank via a first connecting pipe. A condenser is connected to the bottom of the gas phase collector via a second connecting pipe. A third connecting pipe is connected to the side of the condenser closest to the vacuum devolatilization tank.

[0007] Preferably, the heating devolatilization zone includes a heating devolatilization chamber, the top side of which is connected to the feed pipe, and the bottom side of which is away from the feed pipe is connected to the preheater. The heating devolatilization chamber is provided with spiral heat-conducting fins.

[0008] Preferably, the preheater and the heating devolatilization tank are communicated through a fourth connecting pipe, and the preheater is provided with a static mixer.

[0009] Preferably, the vacuum devolatilization tank is fixedly connected with a falling film devolatilization plate, the falling film devolatilization plate is located below the third connecting pipe, the bottom of the vacuum devolatilization tank away from the third connecting pipe is communicated with a vacuum pump, the vacuum pump is communicated with the vacuum devolatilization tank through a fifth connecting pipe, and the fifth connecting pipe is located below the falling film devolatilization plate.

[0010] Preferably, the bottom of the vacuum devolatilization tank is fixedly connected with guide plates in a symmetrical manner, the guide plates are located below the falling film devolatilization plate, a discharge port is arranged between the two guide plates, and the discharge port is communicated with the collecting tank.

[0011] Preferably, the top of the collecting tank is communicated with the discharge port through a sixth connecting pipe.

[0012] The utility model discloses the following technical effects: the feed inlet is used for introducing the polymer material to be devolatilized into the heating devolatilization area, and the polymer flows through the heating pipe in the heating devolatilization area, devolatilizes while heating, reaches the temperature required for devolatilization, heats the polymer to the temperature close to devolatilization through the preheater, reduces the risk of local overheating of the molecular chain, establishes the negative pressure environment through the vacuum devolatilization tank, extracts the volatile component in the polymer, and cools and discharges the volatile component through the condenser, and the utility model can reduce the boiling point of the volatile component, reduce energy consumption and improve devolatilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] The drawings constituting a part of the present application are used to provide further understanding of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0014] Figure 1 It is a structure schematic view of the polymer vacuum devolatilization device of the utility model.

[0015] In the figure: 1, feed pipe; 2, preheater; 3, vacuum devolatilization tank; 4, collecting tank; 5, gas phase collection and discharge device; 6, first connecting pipe; 7, second connecting pipe; 8, condenser; 9, third connecting pipe; 10, heating devolatilization tank; 11, spiral heat conducting sheet; 12, fourth connecting pipe; 13, static mixer; 14, falling film devolatilization plate; 15, vacuum pump; 16, fifth connecting pipe; 17, guide plate; 18, discharge port; 19, sixth connecting pipe. DETAILED DESCRIPTION

[0016] Polymer vacuum devolatilization devices play a crucial role in the production of polymers. Through devolatilization, unreacted monomers, solvents, and oligomers can be effectively removed after polymerization, improving the quality of the polymer and meeting various application requirements.

[0017] Polymer vacuum devolatilization devices are usually composed of preheaters, vacuum devolatilization tanks, rectification towers, and other key components. The following is a detailed introduction to these components:

[0018] Preheater

[0019] The preheater is an important component of the polymer vacuum devolatilization device, and its main function is to preheat the polymer to improve the subsequent devolatilization efficiency. The preheater is usually equipped with a mixing unit structure, so that the polymer can be uniformly heated during the preheating process, avoiding local overheating that can damage the molecular chain. At the same time, mixing and heat exchange are carried out simultaneously, reducing the residence time of the polymer, making the molecular weight distribution of the polymer narrower and the performance more stable.

[0020] In patent CN202211331322.5, Wanhua Chemical proposes a device for polymer devolatilization, in which the preheater uses a feed preheater for heating to ensure that the polymer reaches the appropriate temperature before entering the vacuum devolatilization tank.

[0021] Vacuum devolatilization tank

[0022] The vacuum devolatilization tank is the core component of the polymer vacuum devolatilization device, and its main function is to devolatilize the polymer under vacuum conditions. After the polymer enters the vacuum devolatilization tank, the material rapidly expands due to the reduction in vacuum, and the volatile substances (monomers, oligomers, and solvents) are extracted and volatilized. After the volatile substances are separated from the high polymer, they enter the subsequent rectification tower for further separation.

[0023] In Sulzer Chemical's devolatilization process, the vacuum devolatilization tank is usually completed by a vacuum evaporation tank connected with static equipment. According to the residual monomer content and polymer performance requirements after polymerization, Sulzer Chemical Company can design a single or multi-stage devolatilization process unit. Each stage of the devolatilization process unit is mainly composed of a static mixer / preheater and a vacuum devolatilization tank.

[0024] Rectification tower

[0025] The rectification tower is another key component of the polymer vacuum devolatilization device, and its main function is to separate the volatile substances. After the volatile substances enter the rectification tower, through rectification, the solvent and monomer can be returned to the reaction system, while the oligomer is no longer used. The design and operation of the rectification tower are crucial to ensuring the quality of the polymer and meeting environmental protection requirements.

[0026] The operation of the polymer vacuum devolatilization device is relatively complex, but it can be summarized as follows:

[0027] Preheating

[0028] In the preheater, the polymer is heated to an appropriate temperature. During the preheating process, the polymer is uniformly heated under the action of the mixing unit structure, avoiding the destruction of the molecular chain caused by local overheating. At the same time, mixing and heat exchange are carried out simultaneously, reducing the residence time of the polymer, making the molecular weight distribution of the polymer narrower and the performance more stable.

[0029] Vacuum devolatilization

[0030] The preheated polymer enters the vacuum devolatilization tank. Under vacuum conditions, the polymer rapidly expands, and the volatiles (monomers, oligomers, and solvents) are extracted and volatilized. After the volatiles are separated from the high polymer, they enter the subsequent rectification tower for further separation.

[0031] Rectification separation

[0032] After the volatiles enter the rectification tower, they are separated by rectification. Solvents and monomers can be refluxed to the reaction system, while oligomers are no longer used. The design and operation of the rectification tower are crucial to ensuring the quality of the polymer and meeting environmental protection requirements.

[0033] The polymer vacuum devolatilization device has significant technical advantages, which mainly manifest in the following aspects:

[0034] Extremely low residual amount

[0035] The polymer vacuum devolatilization device can reduce the residual amount in the polymer to an extremely low level through effective devolatilization treatment. This helps to improve the quality of the polymer and meet various application requirements. At the same time, low residual amount also helps to reduce environmental pollution and meet environmental protection requirements.

[0036] In Sulzer's devolatilization process, through the operation and testing of a device with a capacity of 25000t / a, Sulzer's devolatilization system can significantly reduce the residual content in the polymer.

[0037] Products are not damaged

[0038] The polymer vacuum devolatilization device avoids increasing the process temperature and hot spots through effective heat transfer equipment, thereby avoiding damage to the polymer during devolatilization. This helps to maintain the molecular structure and performance stability of the polymer, and improves the service life and application effect of the product.

[0039] Low shear force

[0040] The polymer vacuum devolatilization device produces low shear force during devolatilization, which is particularly important for sensitive products. Low shear force helps to maintain the integrity of the molecular chain of the polymer and avoid performance degradation caused by molecular chain breakage.

[0041] Low energy consumption

[0042] Polymer vacuum devolatilization devices can significantly reduce energy consumption through optimized design and operation. For example, Sulzer Chemical's devolatilization process uses a combination of static mixers / preheaters and vacuum devolatilization tanks, which reduces the energy consumption of the system through efficient heating and devolatilization treatment. At the same time, the mild treatment of the polymer by this process also ensures the quality and performance of the polymer.

[0043] Less mechanical maintenance

[0044] The structure of the polymer vacuum devolatilization device is relatively simple, with fewer mechanical components, so the amount of mechanical maintenance is also relatively small. This helps to reduce the operating and maintenance costs of the equipment, improve the reliability and service life of the equipment.

[0045] Save capital costs

[0046] The polymer vacuum devolatilization device can save capital costs through unique process concepts and structural design. For example, Sulzer Chemical's devolatilization process is superior to existing technology in many ways, and through the operation and testing of a 25000t / a device, Sulzer's devolatilization system investment and operating costs are greatly reduced.

[0047] Here are some detailed introductions to some of these patents:

[0048] Patent application number CN202211331322.5 was obtained by Wanhua Chemical, and the patent name is "A device for polymer devolatilization and a polyolefin elastomer devolatilization method". This patent proposes a devolatilization device composed of multiple devolatilizers, each devolatilizer inlet is provided with an ellipsoid platform distributor, the inlet of the front devolatilizer is heated by a feed preheater, and the last devolatilizer is directly heated by steam. Using this devolatilization device for devolatilization, the material has good film forming property, the volatile content of the obtained material is small, and the devolatilization efficiency is high.

[0049] The devolatilization device of this patent has the advantages of simple structure, easy operation, high devolatilization efficiency, etc., and is suitable for devolatilization treatment of polyolefin elastomers and other polymers.

[0050] Patent application number CN98225107.6 was obtained by China Petroleum Chemical Group Company, China Petroleum Chemical General Company, Shanghai Petroleum Chemical Research Institute, and the patent name is "A devolatilization device for polymers". This patent proposes a devolatilization device that installs a container between the devolatilizer and the vacuum pumping unit. The container can receive the reflux liquid produced by the condensation of volatile components, improve the quality of the polymer product, and prevent the devolatilization pipeline from being blocked.

[0051] The patent's devolatilization device has the advantages of simple structure, easy operation, and improved polymer product quality. By installing a container between the devolatilizer and the vacuum pumping unit, the problem of backflow caused by condensation of volatile components blocking the devolatilization pipeline is effectively solved, improving the reliability and stability of the equipment.

[0052] Other Related Patents

[0053] In addition to the above two patents, there are a large number of patents related to polymer vacuum devolatilization devices on patent websites such as PatSnap. These patents cover various aspects of devolatilization device structure design, operation methods, and process flow. For example, some patents propose using a special structure preheater to improve heating efficiency; some patents propose using a multi-stage devolatilizer to improve devolatilization efficiency; and some patents propose using new materials to improve the service life and reliability of the devolatilization device.

[0054] With the continuous development of the polymer industry, the application prospect of polymer vacuum devolatilization devices is becoming more and more broad. The following is a detailed analysis of the application prospect of polymer vacuum devolatilization devices:

[0055] High-quality polymer production

[0056] Polymer vacuum devolatilization devices play an important role in high-quality polymer production. Through effective devolatilization treatment, impurities and residues in the polymer can be removed, improving the quality and performance of the polymer. This is of great significance for the production of high-quality polymers. In the future, with the increasing demand for high-quality polymers, the application prospect of polymer vacuum devolatilization devices will be even broader.

[0057] Increasing environmental protection requirements

[0058] With the increasing environmental protection requirements, environmental protection issues in the polymer production process are increasingly concerned. As an effective environmental protection equipment, polymer vacuum devolatilization devices can significantly reduce environmental pollution in the polymer production process. Therefore, in the context of increasingly stringent environmental protection requirements, the application prospect of polymer vacuum devolatilization devices will be even broader.

[0059] Research and development of new technologies and new materials

[0060] With the continuous emergence of new technologies and new materials, polymer vacuum devolatilization devices are also developing and innovating. For example, the application of some new materials can improve the service life and reliability of the devolatilization device; the introduction of some new technologies can improve the devolatilization efficiency and product quality, etc. In the future, with the continuous research and development and application of new technologies and new materials, the performance and quality of polymer vacuum devolatilization devices will be further improved, and the application prospect will be even broader.

[0061] Increasing market demand

[0062] With the continuous expansion of the polymer market and the increasing demand, the market demand for polymer vacuum devolatilization devices is also increasing. Especially in some high-end application fields such as automobiles, electronics, medical treatment, etc., the requirements for polymer quality and performance are becoming higher and higher, and the demand for polymer vacuum devolatilization devices is becoming more and more urgent. Therefore, the market demand for polymer vacuum devolatilization devices will continue to increase in the future.

[0063] The filing and implementation of these patents continuously promote the technical progress and application expansion of polymer vacuum devolatilization devices. By learning and learning from the advanced technologies and experiences in these patents, the performance and quality of polymer vacuum devolatilization devices can be further improved to meet various application requirements.

[0064] As an important equipment in the production process of polymers, polymer vacuum devolatilization devices have significant technical advantages and broad application prospects. Through optimization design and operation, polymer vacuum devolatilization devices can significantly improve the quality and performance of polymers to meet various application requirements. At the same time, with the continuous emergence of new technologies and new materials and the continuous improvement of environmental protection requirements, the performance and quality of polymer vacuum devolatilization devices will be further improved, and the application prospect will be more broad.

[0065] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0066] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail in combination with the drawings and specific embodiments.

[0067] Referring to Figure 1 As shown in the figure, the present embodiment provides a polymer vacuum devolatilization device, which comprises a feeding pipe 1, the bottom of the feeding pipe 1 is communicated with a heating devolatilization zone, the bottom of the heating devolatilization zone is communicated with a preheater 2, the bottom of the preheater 2 is communicated with a vacuum devolatilization tank 3, one side of the vacuum devolatilization tank 3 is communicated with a recovery mechanism, and the bottom of the vacuum devolatilization tank 3 is communicated with a collection box 4.

[0068] The feed inlet is used for introducing the polymer material to be devolatilized into the heating devolatilization zone, the polymer flows through the heating column pipe in the heating devolatilization zone, and the devolatilization is carried out while heating, so as to reach the required temperature of devolatilization, the polymer is quickly and uniformly heated to be close to the devolatilization temperature through the preheater 2, the danger of local overheating which destroys the molecular chain is reduced, the volatile components in the polymer are extracted through the negative pressure environment formed by the vacuum devolatilization tank 3, and the volatile components are cooled and discharged through the condenser 8, and the boiling point of the volatile components can be reduced, the energy consumption can be reduced, and the devolatilization efficiency can be improved.

[0069] Further optimization scheme, the recovery mechanism includes a gas phase collector 5 in communication with the vacuum devolatilization tank 3, the gas phase collector 5 is in communication with the vacuum devolatilization tank 3 through a first connecting pipe 6, and the bottom of the gas phase collector 5 is communicated with a condenser 8 through a second connecting pipe 7, and the condenser 8 is communicated with a third connecting pipe 9 close to one side of the vacuum devolatilization tank 3.

[0070] After the material enters the vacuum devolatilization tank 3, flash evaporation is carried out under the negative pressure environment, and the monomers, oligomers and solvents and other volatile components in the polymer are separated from the high polymer. In this process, the volatile components are extracted and recycled or treated through subsequent treatment.

[0071] The condenser 8 is used for cooling the volatile gas into liquid for collection and treatment. The condenser 8 can adopt various cooling modes, such as circulating water cooling.

[0072] Further optimization scheme, the heating devolatilization zone includes a heating devolatilization box 10, one side of the top of the heating devolatilization box 10 is communicated with the feed pipe 1, the bottom of the heating devolatilization box 10 away from the feed pipe 1 is communicated with the preheater 2, and the heating devolatilization box 10 is provided with a spiral heat conducting fin 11.

[0073] The spiral heat conducting fin 11 is arranged to increase the heat exchange area in the heating devolatilization box 10, improve the heat exchange effect, and forcibly update the interface, so as to improve the devolatilization efficiency.

[0074] Further optimization scheme, the preheater 2 and the heating devolatilization box 10 are communicated through a fourth connecting pipe 12, and the preheater 2 is provided with a static mixer 13.

[0075] The built-in mixing unit structure of the preheater 2 can mix and heat at the same time, reduces the residence time of the polymer, makes the molecular weight distribution of the polymer narrower, and the performance is more stable. The preheater 2 is used for quickly and uniformly heating the polymer to be close to the devolatilization temperature, and reduces the danger of local overheating which destroys the molecular chain.

[0076] Further optimization scheme, vacuum devolatilization tank 3 is fixedly connected with falling film devolatilization plate 14, falling film devolatilization plate 14 is located below third connecting pipe 9, the bottom of vacuum devolatilization tank 3 away from third connecting pipe 9 is communicated with vacuum pump 15, vacuum pump 15 is communicated with vacuum devolatilization tank 3 by fifth connecting pipe 16, and fifth connecting pipe 16 is located below falling film devolatilization plate 14.

[0077] The polymer forms a uniform liquid film under the action of the liquid collector distributor, the diffusion distance of the volatile component is shortened, the polymer surface is renewed quickly, and thus the devolatilization effect is improved.

[0078] Further optimization scheme, vacuum devolatilization tank 3 is fixedly connected with falling film devolatilization plate 14, falling film devolatilization plate 14 is located below third connecting pipe 9, the bottom of vacuum devolatilization tank 3 away from third connecting pipe 9 is communicated with vacuum pump 15, vacuum pump 15 is communicated with vacuum devolatilization tank 3 by fifth connecting pipe 16, and fifth connecting pipe 16 is located below falling film devolatilization plate 14.

[0079] Further optimization scheme, the top of collecting tank 4 is communicated with discharge port 18 by sixth connecting pipe 19.

[0080] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0081] The above-described embodiments are only preferred modes of the utility model, and do not limit the scope of the utility model, and various deformations and improvements on the technical scheme of the utility model made by those skilled in the art without departing from the design spirit of the utility model should fall within the protection scope of the utility model claim.

Claims

1. A polymer vacuum devolatilization device, characterized in that: It includes a feed pipe (1), the bottom of which is connected to a heating devolatilization zone, the bottom of which is connected to a preheater (2), the bottom of which is connected to a vacuum devolatilization tank (3), one side of which is connected to a recycling mechanism, and the bottom of which is connected to a collection box (4).

2. The polymer vacuum devolatilization apparatus according to claim 1, characterized in that: The recycling mechanism includes a gas phase collector (5) connected to the vacuum devolatilization tank (3). The gas phase collector (5) is connected to the vacuum devolatilization tank (3) via a first connecting pipe (6). A condenser (8) is connected to the bottom of the gas phase collector (5) via a second connecting pipe (7). A third connecting pipe (9) is connected to the side of the condenser (8) closest to the vacuum devolatilization tank (3).

3. The polymer vacuum devolatilization apparatus according to claim 1, characterized in that: The heating devolatilization zone includes a heating devolatilization chamber (10), the top side of which is connected to the feed pipe (1), and the bottom side of which is away from the feed pipe (1) is connected to the preheater (2). The heating devolatilization chamber (10) is provided with spiral heat-conducting plates (11).

4. The polymer vacuum devolatilization apparatus according to claim 3, characterized in that: The preheater (2) and the heating devolatilization box (10) are connected by a fourth connecting pipe (12), and a static mixer (13) is provided inside the preheater (2).

5. The polymer vacuum devolatilization apparatus according to claim 2, characterized in that: A falling film devolatilization plate (14) is fixedly connected inside the vacuum devolatilization tank (3). The falling film devolatilization plate (14) is located below the third connecting pipe (9). A vacuum pump (15) is connected to the bottom of the vacuum devolatilization tank (3) away from the third connecting pipe (9). The vacuum pump (15) is connected to the vacuum devolatilization tank (3) through a fifth connecting pipe (16). The fifth connecting pipe (16) is located below the falling film devolatilization plate (14).

6. The polymer vacuum devolatilization apparatus according to claim 5, characterized in that: The vacuum devolatilization tank (3) has symmetrically fixed guide plates (17) at the bottom. The guide plates (17) are located below the falling film devolatilization plate (14). A discharge port (18) is provided between the two guide plates (17), and the discharge port (18) is connected to the collection box (4).

7. The polymer vacuum devolatilization apparatus according to claim 6, characterized in that: The top of the collection box (4) is connected to the discharge port (18) via a sixth connecting pipe (19).

Images