Electromagnetic heating coupled supergravity rotating bed device

Abstract

The application provides an electromagnetic heating coupling supergravity rotating bed device, a cutting filler of a cutting assembly and an electromagnetic assembly generate induced current, and then heat themselves, so as to control the temperature in the whole device. The device can avoid the viscosity of the polymer increasing sharply due to the temperature decreasing after the polymer contacts the filler after being heated, and can better solve the easy blocking problem of the polymer devolatilization in the supergravity equipment. Meanwhile, the filler after being heated can keep the temperature of the polymer at a high temperature, which is beneficial to the polymer devolatilization and the gas-liquid separation process, and can fully improve the separation efficiency. The device of the application can be widely used in the polymerization reaction process and the polymer devolatilization and other separation processes, and has a good industrial application prospect.

Description

Technical Field

[0001] This invention relates to the field of hypergravity technology, specifically to an electromagnetically heated coupled hypergravity rotating bed device. Background Technology

[0002] Most polymers obtained from the reaction contain low molecular weight components, such as monomers, solutions, water, and reaction byproducts, which are known as volatiles. Removing volatiles can improve polymer properties, recover monomers and solvents, and thus meet green and environmental standards. In polymer production and processing, the devolatilization process is second only to the reaction process in importance.

[0003] For polymer devolatilization systems, the diffusion rates of gases and liquids within polymers are many orders of magnitude slower than in normal gas and liquid systems, and are much more affected by concentration and temperature. Furthermore, polymer devolatilization does not reach an equilibrium state; separation primarily depends on the rate of polymer devolatilization, i.e., increasing the migration rate of volatiles within the polymer. Therefore, the development of novel, highly efficient mass transfer devices with high-speed surface renewal is crucial for the widespread adoption of polymer devolatilization technology. With the advancement of enhanced devolatilization technology, novel devolatilization equipment, such as rotating packed beds, is demonstrating increasing application potential.

[0004] There are three main challenges in polymer devolatilization: first, polymer solutions generally have high viscosity and exhibit strong non-Newtonian properties; second, the mass transfer coefficient is small, requiring high efficiency from the separation equipment and leading to problems such as large equipment size; and third, the operating conditions are harsh, typically high temperature and vacuum. Theoretically, hypergravity equipment, as a novel process intensification device, has advantages over traditional devolatilization equipment, such as high mass transfer coefficient and small size. It can generate local disturbances as the fluid flows through the packing, enhancing the renewal of the volatilization interface and thus improving devolatilization efficiency. However, a major problem in practical applications and research is clogging. Most polymer melts are pseudoplastic fluids, exhibiting shear thinning; their apparent viscosity decreases with increasing temperature and shear rate. To solve the clogging problem, on the one hand, the liquid distribution method of the hypergravity rotating packed bed needs to be changed to ensure that the high-viscosity, poor-flowability polymer enters the packing layer uniformly along its full height; on the other hand, the temperature of the polymer solution must be maintained, as the pseudoplasticity of the polymer melt decreases with increasing temperature, and high temperature ensures good flowability.

[0005] For thermal insulation of the device, a heating jacket can be used to control the temperature of the entire cavity. The core issue is how to increase the temperature of the packing material. During polymer devolatilization, the high-temperature polymer melt often enters the packing material along the distribution pipe. Since the packing material cannot be heated by the heating jacket, heat transfer occurs between the low-temperature packing material and the polymer melt, causing the polymer melt temperature to drop sharply and its viscosity to increase. This leads to packing blockage and has a significant impact on the entire devolatilization system. How to ensure the temperature of the packing material is a pressing problem that needs to be solved in the application of hypergravity technology to polymer devolatilization.

[0006] Against the backdrop of the above-mentioned technology, this invention proposes a novel electromagnetic heating coupled supergravity rotating bed device. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an electromagnetic heating coupled hypergravity rotating bed device, which is mainly used in the devolatilization of polymers in hypergravity technology and belongs to the field of chemical process.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] This application provides an electromagnetic heating coupled hypergravity rotating bed device, comprising: a housing, and a cutting assembly and an electromagnetic assembly disposed within the inner cavity of the housing;

[0010] The electromagnetic component is located outside the cutting component. The electromagnetic component can cause the cutting filler of the cutting component to generate an induced current to heat itself, thereby controlling the temperature inside the housing cavity.

[0011] The cutting component is used to shear the polymer introduced therein, forming polymer fluid micro-elements, and then to devolatilize the polymer.

[0012] Preferably, the cutting assembly includes a rotating shaft and a rotating disk perpendicular to the rotating shaft, wherein the rotating disk is provided with cutting filler surrounding the rotating shaft.

[0013] Preferably, the rotating turntable is provided with multiple support columns, and the cutting filler is arranged in a concentric circle structure around the support columns. The outer layer of the cutting filler is wound with conductive metal wires, specifically made of high-temperature resistant, corrosion-resistant, and creep-resistant stainless steel (304L, 310S, 316L, etc.), and the inner material is high-strength sintered ceramic (doped with SiC, ZrO2, Si3N4, etc.).

[0014] Preferably, the electromagnetic component includes a first electromagnetic unit and a second electromagnetic unit, wherein the first electromagnetic unit is located at a predetermined distance above the cutting component, and the second electromagnetic unit is located at a predetermined distance below the cutting component.

[0015] Preferably, adjacent magnets of the electromagnetic units located on the same horizontal line have opposite magnetic poles, and magnets of the electromagnetic units located on the same vertical line have opposite magnetic poles.

[0016] Preferably, the electromagnetic heating coupled supergravity rotating bed device further includes a guide plate with a nano (Cr, Ni, Ag, etc.) coating on its surface after electrochemical treatment. The guide plate is located between the second electromagnetic unit and the cutting assembly, and the guide plate is arranged towards the liquid outlet direction.

[0017] Preferably, the electromagnetic heating coupled supergravity rotating bed device further includes multiple fluid distributors, which are arranged facing the rotating shaft and have multiple spray nozzles at different heights, distributed along the entire height of the packing material, with the spray nozzles facing the cutting packing material.

[0018] Preferably, the electromagnetic heating coupled supergravity rotating bed device further includes a heating jacket with a spiral guide plate. The jacket has an inlet and outlet for the heating medium. The heating jacket is fixed to the outside of the shell to better control the temperature of the inner cavity of the shell, and at the same time provides some support to the outer wall of the shell.

[0019] The electromagnetic unit also includes a support plate, one end of which is connected to the housing and the other end of which is connected to the magnet.

[0020] Preferably, the support column is made of high-temperature resistant insulating material, specifically the same high-strength sintered ceramic (doped with SiC, ZrO2, Si3N4, etc.), and is integral with the cutting filler.

[0021] Beneficial effects of the present invention

[0022] This invention provides an electromagnetically heated coupled rotating bed device for high gravity. The cutting packing material of the cutting component induces a current with the electromagnetic component, thereby heating itself and controlling the temperature within the entire device. This device enhances the polymer devolatilization process in the rotating packed bed through electromagnetic induction. On one hand, it avoids the sharp increase in viscosity of the heated polymer upon contact with the packing material due to temperature drop, effectively solving the problem of easy clogging in high gravity equipment during polymer devolatilization. On the other hand, the heated packing material maintains a higher polymer temperature, which is beneficial for the removal of volatiles, enhancing the gas-liquid separation process and significantly improving separation efficiency. This device can be widely used in polymerization reactions and polymer devolatilization processes, and has significant industrial application potential. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This application provides a schematic diagram of an electromagnetic heating coupled supergravity rotating bed device.

[0025] Figure 2 : A schematic diagram of the magnet arrangement in the magnet support plate in this application embodiment.

[0026] Figure 3 Top view of the novel packing structure in the embodiments of this application.

[0027] Figure 4 A single-stage process for using the apparatus of the present invention for polymer devolatilization.

[0028] Figure descriptions: 1. Motor, 2. Electromagnetic component, 3. Volatile component outlet, 4. Support plate, 5. Housing, 6. Heating medium outlet, 7. Polymer outlet, 8. Heating jacket, 9. Heating medium inlet, 10. Fluid distributor, 11. Cutting component, 12. Polymer inlet, 13. Rotating shaft, 14. Guide plate, 15. Magnet support plate, 16. Magnet, 17. Rotating turntable, 18. Cutting filler, 19. Support column. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This application provides an embodiment of an electromagnetically heated coupled hypergravity rotating bed device, such as... Figure 1 As shown, it includes: a housing 5, and a cutting assembly 11 and an electromagnetic assembly 2 disposed within the cavity of the housing 5;

[0031] The electromagnetic component 2 is located outside the cutting component 11. The electromagnetic component 2 can cause the cutting filler 18 of the cutting component 11 to generate an induced current to heat itself, thereby controlling the temperature inside the cavity of the housing 5.

[0032] The cutting component 11 is used to shear the polymer introduced therein, forming polymer fluid micro-elements, and then to devolatilize the polymer.

[0033] In this embodiment, the electromagnetic component 2 is located on the upper and lower sides of the cutting component 11. Therefore, the cutting filler 18 acts as an induction coil to cut magnetic field lines. The induction coil rotates synchronously with the cutting component, causing the coil to cut magnetic field lines and generate current, thereby heating and keeping the rotor warm.

[0034] As described above, this invention provides an electromagnetically heated coupled rotating bed device for hypergravity. By adding magnets within the hypergravity equipment and designing a novel packing structure, the packing itself acts as an induction coil. This induction coil cuts magnetic field lines, generating an induced current that heats itself, achieving high temperatures throughout the device. This device enhances the polymer devolatilization process in the rotating packed bed through electromagnetic induction. On one hand, it avoids the dramatic increase in viscosity of the heated polymer upon contact with the packing due to temperature drop, effectively solving the problem of easy clogging in hypergravity equipment during polymer devolatilization. On the other hand, the heated packing maintains a high polymer temperature, facilitating the removal of volatiles and enhancing the gas-liquid separation process, thus significantly improving separation efficiency. This device can be widely used in polymerization reactions and polymer devolatilization processes, possessing significant industrial application potential. This application offers advantages such as high mass transfer efficiency, small footprint, and high production efficiency.

[0035] In some specific embodiments, the cutting assembly 11 includes a rotating shaft 13 and a rotating disk 17 perpendicular to the rotating shaft, wherein the rotating disk 17 is provided with cutting filler 18 surrounding the rotating shaft 13.

[0036] The rotating turntable 17 is provided with multiple support columns 19, and the cutting filler 18 is arranged in a concentric circle structure around the support columns 19. The cutting filler 18 is a high-strength sintered ceramic that encapsulates conductive material.

[0037] In this embodiment, see Figure 2The cutting filler 18 is arranged around the rotating shaft 13 on the rotating disk 17, so that the cutting filler 18 can rotate with the rotating disk 17 to shear the polymer. The cutting filler 18 of this application adopts a new filler structure. Different support columns 19 are arranged on the rotating disk 17 according to the region. Each region arranges each layer of cutting filler 17 as a coil in a concentric circle, independent but not insulated from each other. As many concentric circles as possible are arranged according to the size of each region. There are cavities between the regions. The number of regions is set to 4 to 8, preferably 6 regions. The cutting filler 18 of the electromagnetic component 2 and the cutting component 11 can be adjusted according to the actual system design to achieve the required temperature. The interior of the cutting filler 18 is high-strength sintered ceramic (doped with SiC, ZrO2, Si3N4, etc.), and the outer layer is wound with stainless steel wire (304L, 310S, 316L, etc.). The support columns 19 are made of the same ceramic material, which has excellent high temperature resistance and insulation performance. Being a whole with the cutting filler can improve the strength.

[0038] In some specific embodiments, the cutting filler with metal filaments wrapped around ceramics has a fast electromagnetic induction heating rate and significantly better mass and heat transfer effects than the cutting filler with a single metal column.

[0039] As described above, this invention provides an electromagnetic heating coupled with a high-gravity rotating bed device, which enhances the polymer devolatilization process and significantly improves the devolatilization rate. The diffusion rate of volatiles in polymers is much slower than that in normal liquids and is greatly affected by temperature. This invention couples electromagnetic heating with a high-gravity rotating bed, achieving self-heating of the packing material, ensuring the temperature of the polymer devolatilization process within the high-gravity rotating bed, and also ensuring the diffusion rate of volatiles to a certain extent. The heated packing material has an enhanced mass transfer effect, thereby improving the devolatilization rate of the entire process. In particular, the electromagnetic induction described in this invention can be designed to control the temperature based on the rotational speed and magnetism of the magnet, making it suitable for different polymer devolatilization systems. Therefore, this device has excellent matching performance.

[0040] In some specific embodiments, the electromagnetic component includes a first electromagnetic unit and a second electromagnetic unit. The first electromagnetic unit is located at a predetermined distance above the cutting component, and the second electromagnetic unit is located at a predetermined distance below the cutting component. The magnetic poles of adjacent magnets of the electromagnetic units located on the same horizontal line are opposite, and the magnetic poles of the magnets of the electromagnetic units located on the same vertical line are opposite.

[0041] In this embodiment, see Figure 1 , Figure 3The electromagnetic component 2 includes a support plate 4 and magnets 16. Support plates 4 are added above and below the original filling area. The support plates 4 are fixedly connected to the housing 5. Each support plate 4 can be equipped with 4 to 8 magnets depending on the magnetic strength of the magnet. Adjacent magnets 16 have opposite polarities, and magnets 16 on the same vertical line have opposite polarities. That is, adjacent magnets 16 on each support plate 4 have opposite polarities, and two magnets 16 on the same vertical plane have opposite magnetic properties.

[0042] As described above, this invention provides an electromagnetic heating coupled high-gravity rotating bed device. This invention can heat the packing material with almost no additional energy consumption. After installing magnets, the kinetic energy of the rotating filling rotor is fully utilized to generate an induced current based on electromagnetic induction. The electrical energy is then converted into heat energy, achieving self-heating of the packing material and realizing energy saving and consumption reduction of the device.

[0043] In some specific embodiments, the electromagnetic heating coupled hypergravity rotating bed device further includes a guide plate 14, the surface of which is electrochemically treated with a nano (Cr, Ni, Ag, etc.) coating, which can resist corrosion and accelerate the flow of viscous fluid. The guide plate 14 is located between the second electromagnetic unit and the cutting assembly, and the guide plate is arranged towards the liquid outlet direction.

[0044] In this embodiment, a guide plate 14 is provided in the packing area. The polymer melt that rotates through the packing passes through the guide plate 14 and flows out of the device from the polymer outlet 7. The guide plate 14 effectively separates the polymer melt from the magnet area to prevent them from interfering with each other. The inclination angle of the guide plate 14 is 10 to 30°, which ensures the smooth flow of the polymer and avoids the impact on the bottom of the equipment and the polymer outlet 7 caused by excessively fast flow.

[0045] In some specific embodiments, the electromagnetic heating coupled hypergravity rotating bed device further includes multiple fluid distributors 10, which are arranged toward the rotating shaft 13 and have multiple spray nozzles at different heights, distributed along the full height of the packing. The spray nozzles are arranged toward the cutting packing 18. The fluid distributors 10 are inserted into the filling rotor and have four spray nozzles to facilitate uniform distribution of the feed.

[0046] In some specific embodiments, the electromagnetic heating coupled hypergravity rotating bed device further includes a heating jacket 8 with a spiral guide plate. The heating jacket 8 is fixed to the outside of the housing 5 and is used to control the temperature of the inner cavity of the housing 5. The jacket is provided with a heating medium inlet 9 and an outlet 6. The entire outer side of the housing 5 from the filling area to the polymer outlet 7 is covered by the heating jacket 8, which allows the temperature of the entire cavity to be controlled at a suitable temperature. At the same time, it also provides some support for the outer wall of the housing, which can reduce the wall thickness, save materials, and reduce equipment manufacturing costs.

[0047] The invention will now be illustrated with specific scenario examples.

[0048] See Figure 4 The single-stage process of using the apparatus of the present invention for polymer devolatilization includes the following steps:

[0049] (1) Turn on the vacuum system to reach the predetermined vacuum level, usually 710-759 mmHg;

[0050] (2) Heat the polymer material to the predetermined temperature; turn on the rotor of the hypergravity device to heat the packing, adjust the speed to reach the required temperature, the hypergravity level of the rotor is generally 30 to 1000g, and jacket the cavity for heating and insulation.

[0051] (3) The heated material is conveyed to the high-gravity devolatilization device, where it flows uniformly to the outer edge of the packing under centrifugal force. High-speed shearing allows the fluid to renew its surface more quickly, completing the polymer devolatilization. The volatiles are blown out by nitrogen, and the devolatilized polymer flows out along the guide plate.

[0052] The present invention will be illustrated below with specific implementation examples.

[0053] Example 1

[0054] The supergravity devolatilization device of the present invention was used to remove free formaldehyde from urea-formaldehyde resin. The heating rate was 30℃ / min. After the vacuum system was turned on, the vacuum degree reached 756mmHg. The urea-formaldehyde resin with a content of about 1.4% completed the devolatilization process at a temperature of 80℃ and a supergravity of 162g. There were four magnets on the top and four on the bottom. The content before and after the process was characterized and analyzed. The content decreased from 1.4% to 0.06%.

[0055] Example 2

[0056] The supergravity devolatilization device of this invention was used to remove residual lactide from polylactic acid. The heating rate was 40℃ / min, and the vacuum degree reached 758mmHg after the vacuum system was turned on. The polylactic acid with a content of about 1.4% completed the devolatilization process under supergravity conditions of 240℃ and 188g. There were eight magnets on the top and eight on the bottom. The content before and after the process was characterized and analyzed. The lactide content decreased from 1.6% to 0.1%.

[0057] Example 3

[0058] The supergravity devolatilization device of this invention was used to remove acrylonitrile polymers. The heating rate was 25°C / min, and the vacuum degree reached 755 mmHg after the vacuum system was turned on. Polylactic acid with a content of about 1.35% was devolatilized at a temperature of 68°C and a supergravity of 30g. There were four magnets on the top and four on the bottom. The content before and after the process was characterized and analyzed. The lactide content decreased from 1.35% to 0.13%.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments described in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. The above descriptions are merely embodiments of the embodiments described in this specification and are not intended to limit the embodiments of this specification. Various modifications and variations can be made to the embodiments described in this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments described in this specification should be included within the scope of the claims of the embodiments described in this specification.

Claims

1. An electromagnetically heated coupled ultragravity rotating bed device, characterized in that, The device includes: a housing, and a cutting assembly and an electromagnetic assembly disposed within the inner cavity of the housing; the electromagnetic assembly is located outside the cutting assembly, and the electromagnetic assembly can induce a current in the cutting filler of the cutting assembly to heat itself, thereby controlling the temperature inside the inner cavity of the housing; the cutting assembly is used to shear the polymer introduced therein, forming polymer fluid micro-elements, thereby performing devolatilization on the polymer; The cutting assembly includes a rotating shaft and a rotating disk perpendicular to the rotating shaft, the rotating disk being provided with cutting filler surrounding the rotating shaft; The rotating disk is equipped with multiple support columns, and the cutting filler is arranged in a concentric circle structure around the support columns. The inside of the cutting filler is high-strength sintered ceramic, and the outer layer is wrapped with high-temperature resistant, corrosion-resistant, and creep-resistant stainless steel wire. The electromagnetic component includes a first electromagnetic unit and a second electromagnetic unit, wherein the first electromagnetic unit is located at a predetermined distance above the cutting component, and the second electromagnetic unit is located at a predetermined distance below the cutting component; Each of the electromagnetic units includes a plurality of magnets, wherein adjacent magnets of electromagnetic units located on the same horizontal line have opposite magnetic poles, and magnets of electromagnetic units located on the same vertical line have opposite magnetic poles. The support column is made of high-temperature resistant insulating material, specifically high-strength sintered ceramic, the same material as the cutting filler, and is an integral part of the cutting filler.

2. The electromagnetic heating coupled hypergravity rotating bed device according to claim 1, characterized in that, The electromagnetic heating coupled high gravity rotating bed device also includes a guide plate with a nano-coating on its surface treated by electrochemical treatment. The guide plate is located between the second electromagnetic unit and the cutting assembly, and the guide plate is arranged in the direction of the liquid outlet.

3. The electromagnetic heating coupled hypergravity rotating bed device according to claim 1, characterized in that, The electromagnetic heating coupled supergravity rotating bed device also includes a heating jacket with a spiral guide plate. The jacket has an inlet and outlet for the heating medium. The heating jacket is fixed to the outside of the shell to better control the temperature of the inner cavity of the shell, and at the same time provides some support to the outer wall of the shell.

4. The electromagnetic heating coupled hypergravity rotating bed device according to claim 1, characterized in that, The electromagnetic component also includes a support plate, one end of which is connected to the housing and the other end of which is connected to the magnet.

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