Pre-dissolution device

Abstract

The utility model provides a kind of pre-dissolution device.Pre-dissolution device includes: pre-dissolution tank, pre-dissolution tank has accommodating space, pre-dissolution tank has with the first inlet and the second inlet of accommodating space communication;Spraying equipment, spraying equipment is set in accommodating space, and spraying equipment is communicated with the first inlet, to make the material that enters to accommodating space by the first inlet is sprayed to accommodating space by spraying equipment.The utility model solves the problem of low dissolution efficiency of gas-phase monomer in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of continuous solution polymerization equipment, and more specifically, to a pre-dissolution device. Background Technology

[0002] Polyolefin production processes mainly include gas-phase, slurry, and solution polymerization. Before the advent of metallocene catalysts, the catalysts used for synthesizing polyolefins were primarily heterogeneous catalysts. Furthermore, ZN catalysts (Ziegler-Natta catalysts) exhibited poor high-temperature stability. Therefore, in the last century, most PE industrial plants (complete industrial production equipment and systems for polyethylene) used gas-phase or slurry processes. With the rapid development of metallocene catalysts, solution polymerization has been increasingly applied to olefin polymerization. Solution polymerization is more advantageous for comonomer insertion and copolymer structure control, especially in the production of products such as POE (polyolefin elastomers) and OBC (olefin block copolymers), where it has become an indispensable choice. However, existing solution polymerization pre-dissolution technologies still have some key technical problems that limit their efficiency and safety in practical applications. Specifically, the mixing of comonomers, monomers, and solvents is often insufficient, resulting in a small gas-liquid two-phase contact area and poor mass transfer, which in turn affects the dissolution efficiency and solubility of gaseous monomers such as ethylene in the solvent. This uneven mixing not only reduces reaction efficiency but may also lead to unstable product quality.

[0003] Patent CN113207283A discloses a solution polymerization process, belonging to the field of solution polymerization technology. It discloses a reactor system for receiving antisolvent, monomer, and solvent, and reacting the monomer to form a polymer; multiple volatilization vessels located downstream of the reactor system, each operating at a lower pressure than the preceding volatilization vessel, and receiving polymer solution from the reactor system; and a liquid-liquid separator for receiving the polymer solution from the reactor system and promoting separation between the polymer and volatiles by reducing the pressure and temperature of the polymer solution in the liquid-liquid separator. This technology does not include a pre-dissolution process for the polymerizable monomers, which can easily lead to uneven mixing of materials, affecting reaction efficiency. Furthermore, during industrial scale-up, the heat of solution of comonomers such as ethylene is enormous, placing excessive demands on the heat dissipation capacity of the polymerization system and potentially posing safety risks.

[0004] In patent CN110016092A, to increase the viscosity of the reaction system for easier subsequent screw reactor operation, a batch reactor is first used for prepolymerization. During polymer preparation, a static mixer is used for static mixing polymerization to further increase the viscosity of the reaction system. To achieve high conversion rates in high-viscosity systems, a reactive screw extruder is used for extrusion polymerization during the preparation process, which is used to produce various types of polyolefins, particularly suitable for the preparation of polyolefin elastomers or mixtures thereof. In this technology, when using batch prepolymerization, the reactants are directly fed into the reactor from the bottom. Relying solely on the stirrer inside the batch reactor cannot ensure uniform mixing of the materials, affecting polymerization efficiency and potentially causing uneven heat distribution.

[0005] In other words, existing gas-phase monomers suffer from low dissolution efficiency. Utility Model Content

[0006] The main objective of this invention is to provide a pre-dissolution device to solve the problem of low dissolution efficiency of gaseous monomers in the prior art.

[0007] To achieve the above objectives, the present invention provides a pre-dissolving device, comprising: a pre-dissolving tank having a containing space, the pre-dissolving tank having a first inlet and a second inlet communicating with the containing space; and a spraying device disposed within the containing space and communicating with the first inlet, so that materials entering the containing space through the first inlet are sprayed into the containing space by the spraying device.

[0008] Furthermore, the pre-dissolving device also includes packing material disposed within the containment space, and the packing material is located at least at the second inlet so that material entering through the second inlet passes through the packing material.

[0009] Furthermore, the first entrance is located above the second entrance.

[0010] Furthermore, the pre-dissolving device also includes: a first conveying pipeline connected to a first inlet, the first conveying pipeline being used to convey refined solvent; a second conveying pipeline connected to the first inlet, the second conveying pipeline being used to convey refined comonomer; and a third conveying pipeline connected to the second inlet, the third conveying pipeline being used to convey refined monomer.

[0011] Furthermore, the pre-dissolving device also includes a first cooling device, at least a portion of which is located within the containment space.

[0012] Furthermore, the first cooling device includes: a heat removal pipeline, at least a portion of which is located within the containment space, the heat removal pipeline having a refrigerant inlet and a refrigerant outlet, both of which are located outside the pre-dissolving tank; and a first heat exchange assembly disposed outside the containment space, the first heat exchange assembly being connected to both the refrigerant inlet and the refrigerant outlet, the first heat exchange assembly being used to exchange heat with the refrigerant within the heat removal pipeline.

[0013] Furthermore, the heat dissipation pipeline has a bend, which is located directly below the first inlet.

[0014] Furthermore, the pre-dissolving device also includes a second cooling device, which is fitted onto the outside of the pre-dissolving tank.

[0015] Furthermore, the second cooling device includes: a cooling jacket, which is fitted over the outside of the pre-melting tank and has a cooling space, and has a cooling medium inlet and a cooling medium outlet communicating with the cooling space; and a second heat exchange component, which is disposed on the outside of the cooling jacket and is connected to both the cooling medium inlet and the cooling medium outlet, and is used to exchange heat with the cooling medium inside the cooling jacket.

[0016] Furthermore, the ratio of the height of the cooling jacket to its inner diameter is greater than or equal to 4 and less than or equal to 13.5.

[0017] Furthermore, the pre-dissolving device also includes: a temperature measuring component, a portion of which is disposed within the accommodating space; and a central control component, which is signal-connected to the temperature measuring component, the first cooling device, and the second cooling device.

[0018] The pre-dissolving device using the technical solution of this utility model includes a pre-dissolving tank and a spraying device. The pre-dissolving tank has a containing space and has a first inlet and a second inlet connected to the containing space. The spraying device is installed in the containing space and is connected to the first inlet so that the material entering the containing space through the first inlet is sprayed into the containing space by the spraying device.

[0019] As the core component of the entire pre-dissolving process, the pre-dissolving tank provides sufficient internal space for the pre-dissolving process, ensuring the residence time of the materials within the tank and guaranteeing the pre-dissolving effect. A spraying device is installed within this space and connected to the first inlet. When the pre-dissolving materials (such as solvents and comonomers) enter the pre-dissolving tank through the first inlet, the spraying device disperses the materials into smaller droplets, significantly increasing the contact area between the gas and liquid phases. This design enhances mass transfer efficiency, accelerating the gas dissolution rate during the dissolution process, allowing gaseous monomers to dissolve more quickly and uniformly in the liquid phase, ultimately forming a homogeneous pre-dissolved product, effectively improving the dissolution efficiency of the gaseous monomers. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of the pre-dissolving device according to an optional embodiment of the present invention is shown.

[0022] The above figures include the following reference numerals:

[0023] 10. Pre-dissolving tank; 11. Containing space; 12. First inlet; 13. Second inlet; 14. Outlet valve; 20. Spraying equipment; 30. Packing material; 40. First conveying pipeline; 41. First valve; 50. Second conveying pipeline; 51. Second valve; 60. Third conveying pipeline; 61. Third valve; 70. Heat dissipation pipeline; 71. Refrigerant inlet; 72. Refrigerant outlet; 80. Cooling jacket; 81. Cooling space; 82. Cooling medium inlet; 83. Cooling medium outlet; 90. Temperature measuring component; 100. Pressure gauge; 110. Safety accessories; 120. Insulation layer; 130. Flange. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0027] To address the problem of low dissolution efficiency of gaseous monomers in existing technologies, this invention provides a pre-dissolution device.

[0028] like Figure 1As shown, the pre-dissolving device includes a pre-dissolving tank 10 and a spraying device 20. The pre-dissolving tank 10 has a receiving space 11 and a first inlet 12 and a second inlet 13 that are connected to the receiving space 11. The spraying device 20 is disposed in the receiving space 11 and is connected to the first inlet 12 so that the material entering the receiving space 11 through the first inlet 12 is sprayed into the receiving space 11 by the spraying device 20.

[0029] As the core component of the entire pre-dissolving process, the pre-dissolving tank 10 provides sufficient space 11 within its internal containment space for the pre-dissolving process, ensuring the residence time of the material within the tank and guaranteeing the pre-dissolving effect. A spraying device 20 is installed within the containment space 11 and connected to the first inlet 12. When the pre-dissolving material (such as solvent and comonomer) enters the tank through the first inlet 12, the spraying device 20 disperses the material into smaller droplets, significantly increasing the contact area between the gas and liquid phases. This design enhances mass transfer efficiency, accelerating the gas dissolution rate during the dissolution process, allowing the gaseous monomers to dissolve more quickly and uniformly in the liquid phase, ultimately forming a homogeneous pre-dissolved material, effectively improving the dissolution efficiency of the gaseous monomers.

[0030] Optionally, the pre-dissolving tank 10 is cylindrical in shape and is a closed pre-dissolving tank. The tank body is made of high-temperature resistant stainless steel, which can be made of SUS304 or SUS310L material. The volume is 10,000 to 50,000 ml, preferably 30,000 ml, and the pressure is 2 to 5 MPa, preferably 3 MPa. The seal is a sanitary mechanical seal.

[0031] Optionally, the spraying equipment 20 consists of a perforated coiled sprayer, pipes, etc. The perforated coiled sprayer in the spraying equipment 20 has 5-1000 holes, preferably 100-200. The perforated coiled sprayer in the spraying equipment 20 is made of one of stainless steel, carbon steel, copper, or ceramic. During the operation of the pre-dissolving device, the spraying equipment 20 remains continuously open.

[0032] In some alternative embodiments, please refer to Figure 1The pre-dissolving device also includes packing material 30, which is disposed within the containing space 11 and is located at least at the second inlet 13, allowing material entering through the second inlet 13 to pass through the packing material 30. The packing material 30 significantly increases the contact area of ​​the material within the pre-dissolving tank 10. When the material enters the containing space 11 through the second inlet 13, it must pass through the packing material 30. The special structure of the packing material 30, such as corrugated, annular, or other complex geometries, provides a large internal surface area, facilitating sufficient contact between gaseous and liquid materials, accelerating the dissolution process, and further improving the dissolution efficiency of gaseous monomers. The presence of the packing material 30 optimizes the mass transfer process. Mass transfer is a key step in the gas-liquid two-phase mixing process. The design of the packing material 30 promotes the formation of fine bubbles, increasing the contact points between the bubbles and the liquid, thereby accelerating the diffusion rate of gaseous monomers in the solvent and improving dissolution efficiency and solubility.

[0033] Furthermore, the packing material 30 promotes turbulence within the containment space 11. This turbulence helps break up bubbles, making them smaller, and simultaneously disrupts the liquid flow, thereby enhancing the renewal of the gas-liquid interface and improving dissolution efficiency. Through the dispersing effect of the packing material 30, gaseous monomers (such as ethylene) can be more uniformly distributed in the liquid phase, avoiding problems of excessively high or low local concentrations and ensuring the uniformity and controllability of the entire pre-dissolution process.

[0034] Optionally, the packing 30 is made of a material with high throughput and low pressure drop, which can provide a large gas-liquid contact area, promote the miscibility of ethylene with octene and hexane, and improve mass transfer efficiency. It is more suitable for applications with large throughput and high requirements for separation efficiency, and is beneficial for industrialization. The packing 30 includes one or more of the following: wire mesh corrugated packing, perforated plate corrugated packing, metal Intalox, metal saddle ring, metal stepped ring, metal Pall ring, ceramic Intalox, ceramic saddle ring, and ceramic Raschig ring. Among them, the specific type of packing material for metal Intalox and ceramic Intalox can be determined as needed.

[0035] In some alternative embodiments, please refer to Figure 1 The first inlet 12 is located above the second inlet 13. A well-planned inlet location helps improve pre-melting efficiency, reduce unnecessary material waste and the load on the heat removal system, thereby lowering overall energy consumption and production costs.

[0036] In some alternative embodiments, the pre-dissolving apparatus further includes a first delivery line 40, a second delivery line 50, and a third delivery line 60. The first delivery line 40 is connected to a first inlet 12 and is used to deliver the refined solvent. The second delivery line 50 is connected to the first inlet 12 and is used to deliver the refined comonomer. The third delivery line 60 is connected to a second inlet 13 and is used to deliver the refined monomer. By setting up independent delivery lines, the amount and rate of addition of each material can be controlled separately. Each delivery line is equipped with pumps and valves to precisely adjust the flow rates of the refined solvent, refined comonomer, and refined monomer, which helps to optimize the pre-dissolving process and improve product quality and yield. The independent delivery line design allows for individual pretreatment, such as filtration, dehydration, or temperature control, before the materials enter the pre-dissolving tank, thereby ensuring that each material entering the pre-dissolving tank meets the required refining standards. Independent delivery pipelines prevent cross-contamination between different materials, maintain material purity, avoid unnecessary byproduct generation during the reaction, and improve the purity and performance of the final polymer product. Furthermore, in case of abnormal conditions, such as sudden changes in temperature or pressure, the input of materials can be quickly adjusted by independently controlling the valves of each delivery pipeline, reducing the impact on the entire pre-melting unit and improving system safety and response speed.

[0037] In addition, independent delivery pipelines are more convenient for maintenance and troubleshooting, allowing for the inspection, cleaning, or repair of a single pipeline without affecting the normal use of other pipelines.

[0038] In some alternative embodiments, a first valve 41 is provided on the first delivery line 40, which is used to deliver refined comonomer.

[0039] Optionally, the refined comonomer includes one or more of ethylene, propylene, and α-olefins. α-olefins are various monoolefins with double bonds at the ends of the molecular chain that are commonly used in the art for solution polymerization; preferably, the α-olefin is selected from at least one of 1-butene, 1-hexene, 1-octene, and 1-decene.

[0040] In some alternative embodiments, a second valve 51 is provided on the second delivery line 50, which is used to deliver refined solvent.

[0041] Optionally, the refining solvent may include nonpolar hydrocarbon solvents and haloalkanes (weakly electrophilic solvents), such as n-hexane, n-octane, cyclohexane, toluene, benzene, carbon tetrachloride, chloroform, chlorobenzene, carbon disulfide, dichloroethane, IsoparE, etc. The refining solvent may also include ethers, aldehydes, ketones, esters, amides, and amines (electron-donating solvents), such as diethyl ether, ethyl acetate, tetrahydrofuran, butyraldehyde, butanone, acetaldehyde, cyclohexanone, acetone, pyridine, dimethylformamide, etc. The refining solvent may also include alcohols, phenols, nitro acids, sulfonic acids, and carboxylic acids (strongly electron-donating or strong hydrogen-bonding solvents), such as hexanol, n-pentanol, n-butanol, n-propanol, m-cresol, acetonitrile, ethanol, acetic acid, formic acid, methanol, phenol, water, sulfuric acid, etc.

[0042] In some alternative embodiments, a third valve 61 is provided on the third delivery line 60, which is used to deliver refined monomers.

[0043] Optionally, the refined monomer includes one or more of ethylene and propylene, and in particular, ethylene is preferred as the refined monomer used.

[0044] First, the refined solvent is sent to the first inlet 12 through the second conveying pipeline 50, and then dispersed into small liquids by the spraying device 20 and sprayed into the pre-dissolving tank 10. Then, the refined monomer is added to the pre-dissolving tank 10 through the third conveying pipeline 60 and the refined copolymer monomer is added to the pre-dissolving tank 10 through the first conveying pipeline 40. The refined monomer is pre-dispersed into small droplets by the spraying device 20 through the packing 30 and then comes into contact with and mixes with the refined solvent, which greatly increases the contact area between the gas and liquid phases, increases the mass transfer time, and increases the solubility and dissolution rate of the refined monomer and refined copolymer monomer in the refined solvent.

[0045] In some alternative embodiments, the pre-dissolving device further includes a first cooling device, at least a portion of which is located within the containment space 11. Heat of dissolution is the heat released when a gaseous monomer, such as ethylene, dissolves in a liquid solvent. If not removed promptly, it can cause a rapid rise in the tank temperature, affecting not only the efficiency of the polymerization reaction and product quality but also potentially posing safety hazards. Placing a portion of the first cooling device within the containment space 11 means that the first cooling device can directly contact the material during the pre-dissolution process, effectively removing the heat of dissolution. Timely removal of heat during the pre-dissolution process helps stabilize the tank pressure, preventing pressure spikes due to temperature increases, thereby reducing the risk of potential bursts or leaks. Furthermore, the structure of the cooling device (such as a coil design) can, while removing heat, also promote turbulence and mixing of the material through contact with the surface of the cooling device, further improving mass transfer efficiency and the contact area between the gas and liquid phases.

[0046] In some alternative embodiments, such as Figure 1As shown, the first cooling device includes a heat-removing pipeline 70 and a first heat exchange assembly. At least a portion of the heat-removing pipeline 70 is located within the receiving space 11. The heat-removing pipeline 70 has a refrigerant inlet 71 and a refrigerant outlet 72, both located outside the pre-dissolving tank 10. The first heat exchange assembly is located outside the receiving space 11 and is connected to both the refrigerant inlet 71 and the refrigerant outlet 72. The first heat exchange assembly is used to exchange heat with the refrigerant within the heat-removing pipeline 70. At least a portion of the heat-removing pipeline 70 extends into the receiving space 11 of the pre-dissolving tank 10, directly contacting the material during the pre-dissolving process, enabling rapid removal of the heat of dissolution. The refrigerant (such as cooling water) enters the heat-removing pipeline 70 through the refrigerant inlet 71, absorbs heat from the pre-dissolving tank 10, and is then discharged through the refrigerant outlet 72. This cycle ensures that the refrigerant with increased temperature can be quickly removed to the outside of the pre-dissolving tank 10, thereby maintaining a highly efficient heat removal capability. After absorbing heat from the pre-dissolving tank 10, the refrigerant in the heat removal pipeline 70 flows through the first heat exchange component located outside the pre-dissolving tank 10. The heat exchange component can be any type of heat exchanger, such as a shell-and-tube heat exchanger or a plate heat exchanger. It utilizes an external cooling medium (such as chilled water or air) to further cool the refrigerant in the heat removal pipeline, restoring its cooling capacity and maintaining the overall system's heat removal efficiency. Through the cooling of the first heat exchange component, rapid cooling of the refrigerant is achieved, preventing a decrease in heat transfer efficiency due to increased refrigerant temperature in the heat removal pipeline 70, and maintaining continuous and efficient cooling capacity. The immediate cooling capacity of the first cooling device effectively controls the temperature inside the pre-dissolving tank 10, preventing excessively high temperatures due to the accumulation of heat of solution, reducing the risk of runaway reaction, and ensuring production safety. By removing heat in a timely manner, the first cooling device helps maintain the pressure inside the pre-dissolving tank within a safe range, preventing material leakage or container damage caused by high pressure, and reducing potential safety hazards.

[0047] In some alternative embodiments, control valves are respectively provided at the refrigerant inlet 71 and the refrigerant outlet 72 to control the opening and closing of the refrigerant inlet 71 and the refrigerant outlet 72.

[0048] Furthermore, the first cooling device is separated from the material conveying system of the pre-dissolving tank 10. This not only reduces cross-contamination between materials and the cooling medium but also facilitates independent operation and maintenance of the cooling system, improving the overall reliability and flexibility of the device. The arrangement of the first heat exchange component allows the operator to control the cooling effect of the refrigerant in the heat dissipation pipeline by adjusting the flow rate and temperature of the external cooling medium, thereby better regulating the temperature inside the pre-dissolving tank 10 and ensuring that the pre-dissolving process is carried out under optimal conditions.

[0049] Optionally, the refrigerant in the heat dissipation pipeline 70 can be adjusted according to the actual situation. The most commonly used is cooling water. Of course, other fluids can also be used, which can be selected according to the actual cooling needs, such as mineral oil / synthetic oil (-40℃~200℃), ethylene glycol aqueous solution (-40℃~100℃, the higher the concentration, the lower the freezing point, the commonly used concentration is 30%~50%), and liquid nitrogen, etc.

[0050] Optionally, the heat dissipation pipeline 70 may be made of one or more of stainless steel, copper, and carbon steel.

[0051] In some alternative embodiments, the heat removal line 70 has a bend located directly below the first inlet 12. This bend increases the path length of the heat removal line 70 within the pre-dissolving tank 10, meaning a longer contact time between the cooling medium (e.g., cooling water) and the material. This helps to remove the heat of dissolution more thoroughly, maintain the target temperature within the pre-dissolving tank 10, and ensure the pre-dissolving process proceeds under stable conditions.

[0052] The injection of solvent often involves a certain amount of heat, and the dissolution process of monomers (especially gaseous monomers such as ethylene) in solvents also releases a significant amount of heat of solution. The design of the bend section can quickly capture and begin to remove this heat, preventing heat accumulation in the tank and affecting temperature control and reaction efficiency during the pre-dissolution process. When the solvent falls into the bend section, it is dispersed by the heat removal line 70, forming a thinner liquid film or smaller droplets. This helps to increase the contact area between the material and the cooling medium, thereby improving heat transfer efficiency. At the same time, the bend section of the heat removal line 70 promotes turbulence and mixing of the material through its structural characteristics, improving the mass transfer process, ensuring uniform mixing of gas and liquid materials, and accelerating the dissolution rate.

[0053] In some optional embodiments, the pre-dissolving device further includes a second cooling device, which is fitted around the outside of the pre-dissolving tank 10. The first cooling device (heat removal pipeline 70) is responsible for directly removing the heat of dissolution within the pre-dissolving tank 10, while the second cooling device controls the overall temperature of the pre-dissolving tank 10 from the outside. The two work together to form a comprehensive heat management system. This efficiently removes internally generated heat and effectively controls the influence of external environmental factors on the tank temperature, ensuring that the pre-dissolving process takes place in a stable temperature environment. As an external barrier to the pre-dissolving tank 10, the second cooling device can absorb heat emitted from the tank or prevent external heat sources from interfering with the internal temperature, thus acting as a thermal buffer. This design helps maintain a stable temperature inside the pre-dissolving tank, ensuring ideal temperature conditions for the pre-dissolving process even when the external temperature fluctuates. The uniform distribution of the second cooling device ensures the temperature consistency of the pre-dissolving tank wall, avoiding local overheating or undercooling, which is crucial for the uniform dissolution of materials and the smooth progress of subsequent polymerization reactions.

[0054] The second cooling device, used in conjunction with the first cooling device, forms a dual cooling protection system, further reducing the risk of temperature rise within the pre-dissolving tank 10 and improving the safety of the entire pre-dissolving process. Stable temperature control indirectly affects the management of pressure within the tank. The second cooling device helps maintain the pressure within the tank at a safe level, preventing sudden pressure increases due to excessively high temperatures and reducing potential safety hazards.

[0055] In some optional embodiments, the second cooling device includes a cooling jacket 80 and a second heat exchange assembly. The cooling jacket 80 is fitted around the outside of the pre-dissolving tank 10 and has a cooling space 81. The cooling jacket 80 has a cooling medium inlet 82 and a cooling medium outlet 83 communicating with the cooling space 81. The second heat exchange assembly is disposed outside the cooling jacket 80 and is connected to both the cooling medium inlet 82 and the cooling medium outlet 83. The second heat exchange assembly is used to exchange heat with the cooling medium inside the cooling jacket 80. The cooling jacket 80, fitted around the outside of the pre-dissolving tank 10, can uniformly surround the tank body, ensuring that the cooling medium can contact the entire outer wall of the pre-dissolving tank, achieving comprehensive cooling of the pre-dissolving tank. Compared with local cooling, the design of the cooling jacket helps to maintain the uniformity and stability of the temperature inside the tank, avoiding uneven material dissolution or local overheating caused by temperature gradients. The cooling medium inside the cooling jacket 80 can enter through the cooling medium inlet 82, absorb heat from the tank wall of the pre-dissolving tank 10, and then flow out through the cooling medium outlet 83, entering the second heat exchange assembly for heat exchange. The second heat exchange component can be any type of heat exchanger. Its function is to transfer the heat absorbed by the cooling medium in the cooling jacket 80 to an external cooling medium (such as water or air), thereby reducing the cooling medium to a lower temperature and allowing it to flow back to the cooling jacket 80 for cooling operations. This cycle improves the overall efficiency of the cooling system, ensuring that the cooling medium can continuously and effectively perform its cooling task. The coordinated operation of the second cooling device with the pre-dissolving tank 10 reduces temperature fluctuations within the tank, preventing changes in reaction rate or product quality degradation due to temperature instability, and ensuring the stability and controllability of the continuous solution polymerization process.

[0056] In some alternative embodiments, control valves are provided at both the cooling medium inlet 82 and the cooling medium outlet 83 to control the opening and closing of the cooling medium inlet 82 and the cooling medium outlet 83.

[0057] In some alternative embodiments, the ratio of the height of the cooling jacket 80 to its inner diameter is greater than or equal to 4 and less than or equal to 13.5. A higher aspect ratio means that the height of the cooling jacket is longer relative to its inner diameter, which provides a larger contact area for the cooling medium, thereby increasing the total heat transfer area of ​​the cooling jacket. The increased heat transfer area helps to improve the cooling efficiency of the pre-dissolving tank wall, ensuring that heat can be removed from the tank more evenly and quickly. A longer cooling jacket can better distribute heat, avoiding a decrease in material dissolution efficiency or product quality fluctuations due to local overheating or uneven cooling during the pre-dissolution process. Uniform heat distribution is crucial for maintaining the consistency of the material temperature inside the tank, which helps to improve the pre-dissolution effect and the controllability of the polymerization reaction. A cooling jacket with a higher aspect ratio is beneficial for the design of the cooling medium circulation path, which can adopt a bottom-in, top-out method to increase the residence time of the cooling medium in the cooling jacket and improve its heat absorption efficiency. An appropriate aspect ratio also takes into account the control of circulation resistance, avoiding an increase in the flow resistance of the cooling medium due to an excessively long cooling jacket, which would affect the cooling efficiency.

[0058] In some optional embodiments, the pre-dissolving device further includes a temperature measuring component 90 and a central control component. A portion of the temperature measuring component 90 is disposed within the receiving space 11, and the central control component is signal-connected to the temperature measuring component 90, the first cooling device, and the second cooling device. The portion of the temperature measuring component 90, disposed within the receiving space 11 of the pre-dissolving tank 10, can directly contact the pre-dissolved material, enabling real-time monitoring of the material temperature. This is crucial for continuous solution polymerization processes, as the material temperature directly affects the dissolution efficiency and the subsequent polymerization reaction during the pre-dissolving stage. The temperature measuring component 90 establishes a signal connection with the central control component, enabling it to instantly transmit the monitored temperature data to the central control component. The central control component then automatically adjusts the operating status of the first and second cooling devices based on this data, ensuring that the temperature within the pre-dissolving tank 10 remains within the ideal range. This real-time feedback mechanism significantly improves the accuracy of temperature control, reduces the need for manual intervention, and enhances the system's automation level.

[0059] Based on real-time data from the temperature sensing component 90, the central control unit intelligently controls the flow rate and temperature of the cooling media in the first and second cooling devices, achieving dynamic heat management. When a temperature rise is detected inside the pre-melting tank 10, the central control unit can automatically increase the flow rate of the cooling media or use a lower-temperature cooling media, and vice versa, ensuring that the temperature of the material during the pre-melting process does not deviate from the set value. Through the precise adjustment of the central control unit, overheating or overcooling inside the pre-melting tank can be effectively prevented, which is extremely important for polymer quality control and production safety.

[0060] The temperature sensing component 90 can be set with an early warning threshold. Once the temperature inside the pre-melting tank 10 exceeds the safe range, an alarm is immediately sent to the central control component, triggering a safety response, such as automatically closing the material inlet or increasing the cooling intensity, to prevent accidents and ensure production safety. The temperature stability during the pre-melting stage directly affects the polymerization reaction. Through the cooperation of the temperature sensing component 90 and the central control component, the constant temperature conditions required for the reaction can be maintained, avoiding changes in the reaction rate due to temperature fluctuations, and ensuring the quality and yield of the polymer.

[0061] Furthermore, the central control unit allows operators to remotely monitor the temperature of the pre-melting tank and remotely control the cooling system, greatly enhancing operational flexibility and convenience. The central control unit can adjust the cooling system's operating status in a timely manner according to the actual temperature requirements of the pre-melting tank 10, avoiding over-cooling or unnecessary energy consumption, thereby reducing production costs and improving energy efficiency.

[0062] Furthermore, the central control unit can record all temperature data detected by the temperature sensing component 90, providing information resources for subsequent process optimization and fault diagnosis. Long-term temperature data recording helps operators or engineers analyze temperature variation patterns during the pre-melting process, adjust pre-melting conditions based on data analysis results, further optimize the polymerization process, and improve product consistency and performance.

[0063] The cooling pipeline 70 contains refrigerant, which enters from the refrigerant inlet 71 and exits from the refrigerant outlet 72, carrying away the heat of dissolution. To monitor the temperature change inside the pre-dissolving tank 10, a temperature measuring component 90 is provided. A cooling jacket 80 is also provided outside the pre-dissolving tank 10. Cooling medium flows through the cooling space 81 of the cooling jacket 80. The cooling medium enters from the cooling medium inlet 82 and exits from the cooling medium outlet 83. The temperature difference is used to carry away the heat of dissolution generated by the refining monomer and the refining copolymer monomer in the refining solvent, maintaining a constant system temperature and ensuring the safe conduct of the reaction. Since the dissolution process requires a certain pressure, the pre-dissolving device also has a pressure gauge 100 and a safety accessory 110. The mixture obtained after pre-dissolution is completed is output to the reaction vessel through the outlet valve 14 at the bottom of the pre-dissolving tank 10.

[0064] Optionally, safety accessory 110 includes a safety valve and a rupture disc to enhance the system's safety performance. For example, the safety valve and rupture disc operate at pressures below 2.8 MPa, with a burst pressure of 2.8 MPa. The rupture disc bursts when the pressure inside the pre-melting tank 10 exceeds 3 MPa.

[0065] In some optional embodiments, during the operation of the pre-dissolving device, the pressure inside the pre-dissolving tank 10 is controlled at 1.5 to 3.5 MPa, preferably 2 MPa, the temperature is 10 to 80°C, preferably 20 to 30°C, and the feed rate is 2000 to 10000 ml / h, preferably 5000 ml / h.

[0066] In some alternative embodiments, the pre-dissolving device further includes an insulation layer 120, which surrounds the outside of the cooling jacket 80 to reduce the impact of external temperature fluctuations on the temperature of the pre-dissolving system.

[0067] Optionally, the insulation layer 120 is made of asbestos.

[0068] In some embodiments, the wall thickness of the pre-dissolving tank 10 is greater than or equal to 10 mm and less than or equal to 25 mm, preferably 15 mm, and the height of the pre-dissolving tank 10 is greater than or equal to 1000 mm and less than or equal to 2500 mm, preferably 1500 mm. The height-to-diameter ratio is between 5 and 12.5, preferably 8. The inner diameter of the pre-dissolving tank 10 is greater than or equal to 1000 mm and less than or equal to 1100 mm, and it is designed to withstand a maximum pressure of 3 MPa and a maximum temperature of 150°C. The tank wall of the pre-dissolving tank 10 undergoes high-precision polishing to reduce its surface roughness, with a polishing degree of 0.2–0.4 μm, preferably 0.3 μm.

[0069] In some optional embodiments, the cooling jacket 80 is made of stainless steel or ordinary carbon steel and is a full-enclosed jacket. The inner diameter of the cooling jacket 80 is greater than or equal to 1200 mm and less than or equal to 1500 mm, preferably 1300 mm. The thickness of the cooling jacket 80 is greater than or equal to 10 mm and less than or equal to 15 mm. The ratio of the height to the inner diameter of the cooling jacket 80 is greater than or equal to 4 and less than or equal to 13.5, preferably 8. The cooling jacket 80 can withstand a maximum pressure of less than 2 MPa. The cooling medium can be condensate to prevent the heat released during dissolution in the pre-dissolving tank 10 from causing an overall temperature increase and increasing pressure, thus creating safety hazards. The cooling medium inlet 82 on the cooling jacket 80 is located below the cooling medium outlet 83, using a bottom-in, top-out circulation method to increase the heat transfer area. The heat transfer area of ​​the cooling jacket 80 is greater than or equal to 3.4 m². 2 And less than or equal to 4.5m 2 Preferably 4m 2 .

[0070] In some alternative embodiments, the heat transfer coefficient of the cooling jacket 80 is greater than or equal to 100 W / (m²). 2 ·K) and less than or equal to 500W / (m 2 ·K), the heat transfer coefficient of the heat dissipation pipeline 70 is greater than or equal to 300W / (m). 2 ·K) and less than or equal to 1000W / (m 2·K).

[0071] In some optional embodiments, the temperature, pressure, and material flow rate inside the tank are monitored in real time by a DCS (Distributed Control System), and a threshold triggering coordination mechanism is set: when the temperature rise rate is <1℃ / min, only the cooling jacket 80 works; when the temperature rise rate is ≥1℃ / min and <3℃ / min, the cooling jacket 80 and the heat dissipation pipeline 70 are activated simultaneously, and the refrigerant flow rate in the heat dissipation pipeline 70 operates at 50% of the rated value; when the temperature rise rate is ≥3℃ / min, the heat dissipation pipeline 70 operates at full load, and the cooling jacket 80 is linked to increase the medium flow rate to ensure that the temperature is controlled within a safe range (e.g., ≤60℃, adjusted according to process parameters).

[0072] In some optional embodiments, the cooling medium in the cooling jacket 80 is circulating water, the temperature at the cooling medium inlet 82 is in the range of 25°C to 30°C, the temperature at the cooling medium outlet 83 is less than or equal to 35°C, the temperature difference is controlled within 5-8°C, and the rated flow rate is 2 m / s. The refrigerant in the heat dissipation pipeline 70 is chilled brine, the temperature at the refrigerant inlet 71 is in the range of -15°C to -10°C, the temperature at the refrigerant outlet 72 is less than or equal to -5°C, the temperature difference is controlled within the range of 3-5°C, and the rated flow rate is 1.5 m / s.

[0073] In some alternative embodiments, the pre-dissolving device further includes a flange 130 disposed on the outer wall of the pre-dissolving tank 10 and located above the cooling jacket 80.

[0074] Example 1

[0075] The pre-dissolving tank 10 has a volume of 30L and is made of stainless steel. 6L of refined hexane is added to the pre-dissolving tank 10, with the flow rate controlled by a flow pump (not shown in the diagram) at 300ml / min. The refined hexane enters the pre-dissolving tank 10 through a spray device 20. Specifically, the multi-hole coil sprayer has 100 holes. The spray device 20 then adds 1.8L of refined octene to the pre-dissolving tank 10, with the flow rate controlled by a flow pump (not shown in the diagram) at 80ml / min. 1.2L of refined ethylene (set to 80ml / min) enters the pre-dissolving tank 10 through the spray device 20. It then passes through the third conveying pipeline 60 at the bottom of the tower, and is mixed with refined octene and refined hexane via packing 30. The temperature change inside the pre-dissolving tank 10 is monitored in real time. When a temperature rise occurs, the refrigerant inlet 71 and refrigerant outlet 72 of the internal heat dissipation pipeline 70 are opened. Simultaneously, the cooling medium inlet 82 and cooling medium outlet 83 of the cooling jacket 80 are opened, allowing the cooling medium to circulate within the cooling jacket 80, reducing the temperature inside the pre-dissolving tank 10 and preventing poor pre-dissolving effect due to system overheating. The temperature rise inside the pre-dissolving tank 10 is observed. If the temperature stabilizes, the pressure is increased to 3MPa, and feeding continues into the pre-dissolving tank 10. When the blended components fill the pre-dissolving tank 10 to 70% of its liquid level, the inlets for the comonomer and ethylene outside the tank are closed. Simultaneously, the outlet valve 14 at the bottom of the pre-dissolving tank 10 is opened to allow the mixture to enter the next system for polymerization. If the temperature inside the tank continues to rise, turn on the external cooling medium and set the flow rate. The flow rate is set according to the heating rate.

[0076] The polymerization reaction ends when the catalyst in the polymerization system is exhausted. The outlet valve 14 is closed, along with the external comonomer and ethylene feed inlets. The refrigerant inlet 71 and outlet 72 of the internal heat dissipation pipeline 70 are closed, as are the cooling medium inlet 82 and outlet 83 of the cooling jacket 80, stopping the circulation of the cooling medium. The spray equipment 20 is then shut down. At 25℃ and 1.8MPa, the dissolution limit is reached in approximately 1 hour. The solubility of ethylene in the mixture of hexane and octene reaches 25.4g ethylene / 100g hexane, significantly shortening the dissolution time and improving the dissolution efficiency. The mixture is then transferred to the reactor (not shown in the diagram). During the dissolution process, the temperature of the pre-dissolved system is maintained at 25±3℃, indicating that this device has excellent heat dissipation capabilities.

[0077] Example 2

[0078] like Figure 1The pre-dissolving tank has a volume of 30L and is made of stainless steel. 6L of refined nonane is added to the pre-dissolving tank 10, with the flow rate controlled by a flow pump (not shown in the diagram) at 300ml / min. The refined nonane enters the pre-dissolving tank 10 through a spray device 20. Specifically, the multi-hole coil sprayer has 100 holes. The spray device 20 then adds 1.8L of refined octene to the pre-dissolving tank 10, with the flow rate controlled by a flow pump (not shown in the diagram) at 80ml / min. 1.8L of refined ethylene (set to 80ml / min) enters the pre-dissolving tank 10 through the spray device 20. It then passes through the third conveying pipeline 60 at the bottom of the tower, and is mixed with refined octene and refined nonane via packing 30. The temperature change inside the pre-dissolving tank 10 is monitored in real time. When a temperature rise occurs, the refrigerant inlet 71 and refrigerant outlet 72 of the heat dissipation pipeline 70 inside the tank are opened. Simultaneously, the cooling medium inlet 82 and cooling medium outlet 83 of the cooling jacket 80 are opened, allowing the cooling medium to circulate within the cooling jacket 80, reducing the temperature inside the pre-dissolving tank 10 and preventing poor pre-dissolving effect due to system overheating. The temperature rise inside the pre-dissolving tank 10 is observed. If the temperature stabilizes, the pressure is increased to 3MPa, and feeding continues into the pre-dissolving tank 10. When the blended components fill the pre-dissolving tank 10 to 70% of its liquid level, the comonomer and ethylene inlets outside the tank are closed. Simultaneously, the outlet valve 14 at the bottom of the pre-dissolving tank 10 is opened to allow the mixture to enter the next system for polymerization. If the temperature inside the tank continues to rise, open the external condensate and set the flow rate. The flow rate is set according to the heating rate.

[0079] When the catalyst in the polymerization reaction system is exhausted, the polymerization reaction ends. Close the outlet valve 14, and simultaneously close the inlets for the comonomer and ethylene outside the tank, close the refrigerant inlet 71 and refrigerant outlet 72 of the heat dissipation pipeline 70 inside the tank, close the cooling medium inlet 82 and cooling medium outlet 83 of the cooling jacket 80 to stop the circulation of the cooling medium, and shut down the spray equipment 20.

[0080] Example 3

[0081] like Figure 1The pre-dissolving tank has a volume of 30L and is made of stainless steel. 6L of refined cyclohexane is added to the pre-dissolving tank 10, with the flow rate controlled by a flow pump (not shown in the diagram) at 300ml / min. The refined hexane enters the pre-dissolving tank 10 through a spray device 20. Specifically, the multi-hole coil sprayer has 100 holes. The spray device 20 then adds 1.8L of refined octene to the pre-dissolving tank 10, with the flow rate controlled by a flow pump (not shown in the diagram) at 80ml / min. 1.2L of refined ethylene (set to 80ml / min) enters the pre-dissolving tank 10 through the spray device 20. It then passes through the third conveying pipeline 60 at the bottom of the tower, and is mixed with refined octene and refined hexane via packing 30. The temperature change inside the pre-dissolving tank 10 is monitored in real time. When a temperature rise occurs, the refrigerant inlet 71 and refrigerant outlet 72 of the internal heat dissipation pipeline 70 are opened. Simultaneously, the cooling medium inlet 82 and cooling medium outlet 83 of the cooling jacket 80 are opened, allowing the cooling medium to circulate within the cooling jacket 80, reducing the temperature inside the pre-dissolving tank 10 and preventing poor pre-dissolving effect due to system overheating. The temperature rise inside the tank is observed. If the temperature stabilizes, the pressure is increased to 3MPa, and the pre-dissolving tank 10 continues to be fed. When the blended components fill the pre-dissolving tank 10 to 70% of its liquid level, the comonomer and ethylene inlets outside the tank are closed. Simultaneously, the outlet valve 14 at the bottom of the pre-dissolving tank 10 is opened to allow the mixture to enter the next system for polymerization. If the temperature inside the tank continues to rise, open the external condensate and set the flow rate. The flow rate is set according to the heating rate.

[0082] When the catalyst in the polymerization reaction system is exhausted, the polymerization reaction ends. Close the outlet valve 14, and simultaneously close the inlets for the comonomer and ethylene outside the tank, close the refrigerant inlet 71 and refrigerant outlet 72 of the heat dissipation pipeline 70 inside the tank, close the cooling medium inlet 82 and cooling medium outlet 83 of the cooling jacket 80 to stop the circulation of the cooling medium, and shut down the spray equipment 20.

[0083] Comparative Example 1

[0084] The pre-dissolving tank has a volume of 30L and is made of stainless steel. 6L of refined hexane is added to the pre-dissolving tank 10, with the flow rate controlled by the flow pump (not shown in the diagram) at 300ml / min. Specifically, the pre-dissolving device in the comparative example does not include spray equipment, tower packing, or a heat removal system. 1.8L of refined octene is added to the pre-dissolving tank 10, with the flow rate controlled by the flow pump (not shown in the diagram) at 80ml / min. 1.2L of refined ethylene is added, also at 80ml / min, and mixed with the refined octene and hexane. The temperature change inside the pre-dissolving tank is monitored in real time. Simultaneously, the outlet valve 14 at the bottom of the pre-dissolving tank 10 is opened to allow the material to enter the next system for polymerization. If the temperature inside the tank continues to rise, the external condensate is opened and the flow rate is set according to the heating rate.

[0085] The polymerization reaction ends when the catalyst in the polymerization system is exhausted. Close outlet valve 14, and simultaneously close the comonomer and ethylene inlets outside the tank.

[0086] In summary, the parameters such as heat of solution, solubility, and temperature fluctuation in Examples 1 to 3 and Comparative Example 1 are detailed in Table 1. MFR is an abbreviation for Melt Flow Rate, also known as Melt Index (MI). It is a core indicator for evaluating the processing fluidity of thermoplastics, defined as the mass of molten resin passing through a standard capillary tube within 10 minutes at a specific temperature and pressure (unit: g / 10min).

[0087] Dissolution conditions 25℃, 3.5MPa 25℃, 2.8MPa 25℃, 3.2MPa 25℃, 3.5MPa solvent Refined hexane Refined nonane Refined cyclohexane Refined hexane Heat of solution released upon complete dissolution 180.5 KJ / Kg 212.89 KJ / Kg 185.5 KJ / Kg 180.5 KJ / Kg solubility 34.4g ethylene / 100g hexane 25.4g ethylene / 100g nonane 28.1g ethylene / 100g cyclohexane 10.7g ethylene / 100g hexane Cooling system operating temperature fluctuations 0 0 0 35±5℃ (without cooling system) Comonomer unit content, wt% 0.30, octene 0.24, octene 0.27, octene 0.09, octene MFR, g / 10min 6.2 3.8 5.2 0.5 <![CDATA[Density, g / cm 3 > 0.877 0.886 0.884 0.902

[0088] Table 1

[0089] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0090] 1. The pre-dissolving device is equipped with a spraying device 20, which can significantly increase the contact area between the gas and liquid phases, enhance the mass transfer effect between the two phases, and make the ethylene dispersion more uniform.

[0091] 2. The pre-dissolving device is equipped with packing material, which can further increase the contact area between the gas and liquid phases, enhance the mass transfer effect between the two phases, and further make the ethylene dispersion more uniform.

[0092] 3. The pre-dissolving device is equipped with a first cooling device and a second cooling device, which can ensure the temperature and pressure inside the pre-dissolving device.

[0093] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0094] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0095] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0096] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pre-dissolving device, characterized in that, include: A pre-dissolving tank (10) has a receiving space (11) and a first inlet (12) and a second inlet (13) communicating with the receiving space (11). A spraying device (20) is provided in the containing space (11) and is connected to the first inlet (12) so that the material entering the containing space (11) through the first inlet (12) is sprayed into the containing space (11) by the spraying device (20); The pre-dissolving device further includes a packing material (30) disposed within the accommodating space (11), and the packing material (30) is located at least at the second inlet (13) so that the material entering through the second inlet (13) passes through the packing material (30).

2. The pre-dissolving device according to claim 1, characterized in that, The first entrance (12) is located above the second entrance (13).

3. The pre-dissolving device according to claim 1, characterized in that, The pre-dissolving device also includes: The first delivery line (40) is connected to the first inlet (12) and is used to deliver refined solvent; The second delivery pipeline (50) is connected to the first inlet (12) and is used to deliver refined comonomers; The third delivery line (60) is connected to the second inlet (13) and is used to deliver refined monomers.

4. The pre-dissolving apparatus according to any one of claims 1 to 3, characterized in that, The pre-dissolving device also includes a first cooling device, at least a portion of which is located within the containment space (11).

5. The pre-dissolving apparatus according to claim 4, characterized in that, The first cooling device includes: A heat removal pipeline (70), at least a portion of which is located within the containment space (11), the heat removal pipeline (70) having a refrigerant inlet (71) and a refrigerant outlet (72), both of which are located outside the pre-dissolving tank (10); The first heat exchange component is disposed outside the accommodating space (11). The first heat exchange component is connected to both the refrigerant inlet (71) and the refrigerant outlet (72). The first heat exchange component is used to exchange heat with the refrigerant in the heat dissipation pipeline (70).

6. The pre-dissolving apparatus according to claim 5, characterized in that, The heat dissipation pipeline (70) has a bend section located directly below the first inlet (12).

7. The pre-dissolving apparatus according to claim 4, characterized in that, The pre-dissolving device also includes a second cooling device, which is sleeved on the outside of the pre-dissolving tank (10).

8. The pre-dissolving apparatus according to claim 7, characterized in that, The second cooling device includes: Cooling jacket (80), the cooling jacket (80) is sleeved on the outside of the pre-dissolving tank (10), and the cooling jacket (80) has a cooling space (81), the cooling jacket (80) has a cooling medium inlet (82) and a cooling medium outlet (83) communicating with the cooling space (81). The second heat exchange component is disposed on the outside of the cooling jacket (80). The second heat exchange component is connected to both the cooling medium inlet (82) and the cooling medium outlet (83). The second heat exchange component is used to exchange heat with the cooling medium inside the cooling jacket (80).

9. The pre-dissolving apparatus according to claim 8, characterized in that, The ratio of the height of the cooling sleeve (80) to its inner diameter is greater than or equal to 4 and less than or equal to 13.

5.

10. The pre-dissolving apparatus according to claim 7, characterized in that, The pre-dissolving device also includes: A temperature measuring component (90), a portion of which is disposed within the receiving space (11), The central control component is signal-connected to the temperature measuring component (90), the first cooling device, and the second cooling device.

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