A reaction kettle applied to polymethyl methacrylate production
By using a double-layer reactor and an intelligent temperature control system, the problems of inaccurate temperature control, unsatisfactory stirring effect, and insufficient safety monitoring in the production of polymethyl methacrylate have been solved, thus achieving an efficient and safe production process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING SHUANGXIANG OPTICAL MATERIALS CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-06-02
AI Technical Summary
Existing reactors in the production of polymethyl methacrylate (PMMA) suffer from problems such as inaccurate temperature control, unsatisfactory stirring effect, and insufficient safety monitoring, leading to unstable product quality and safety hazards.
The reactor adopts a double-layer structure design, with a spiral circulation pipe in the interlayer between the inner and outer vessels, filled with synthetic heat transfer oil, and precise temperature control is achieved through a refrigeration and heating engine and electromagnetic valves in conjunction with a microprocessor; the stirring shaft is equipped with a multi-layer fan blade assembly, combined with temperature and pressure sensors and alarms, to achieve safety monitoring and automatic control.
It enables precise temperature control, uniform mixing, and safety monitoring in the production process of polymethyl methacrylate, improving product quality and production safety while reducing energy consumption and labor intensity.
Smart Images
Figure CN224308410U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of polymethyl methacrylate (PMMA) production, and specifically to a reaction vessel used in the production of PMMA. Background Technology
[0002] Polymethyl methacrylate (PMMA), commonly known as plexiglass, occupies an important position in many fields due to its excellent comprehensive properties. In the construction industry, its high light transmittance, lightweight, and impact resistance make it widely used in skylights, sound barriers, and interior partitions, effectively introducing natural light while resisting harsh weather and external impacts. In the field of optical instruments, its excellent optical stability and uniform refractive index make it an ideal material for manufacturing eyeglass lenses, microscope slides, and camera lens caps, ensuring image clarity and visual comfort. Furthermore, it plays a crucial role in medical devices, aerospace, and advertising displays, becoming an indispensable high-performance material in modern industry.
[0003] In the production of polymethyl methacrylate (PMMA), the performance of the reactor affects product quality and production efficiency in many ways: temperature control accuracy determines the growth and termination of molecular chains; excessively high temperatures can easily trigger explosive polymerization, resulting in a wider molecular weight distribution, increased product brittleness, and reduced optical transparency; while excessively low temperatures will cause slow decomposition of the initiator, incomplete reaction, and excessive residual monomers; uniform stirring ensures thorough mixing of materials and avoids excessive local concentration and temperature differences that lead to uneven molecular weight; in terms of safety management, pressure monitoring can prevent pressure runaway and safety accidents, ensuring continuous production.
[0004] Currently, existing reactors have several shortcomings when used in the production of polymethyl methacrylate (PMMA). Firstly, temperature control is not precise enough. The polymerization reaction of PMMA is extremely sensitive to temperature; prolonged exposure to excessively high or low temperatures can easily lead to unstable product quality and uneven molecular weight distribution. Secondly, material adhering to the inner wall of the reactor prevents thorough mixing, resulting in inadequate stirring and affecting the uniformity and speed of the reaction, thus reducing product quality. Furthermore, existing reactors also have deficiencies in safety management, lacking effective intelligent safety monitoring and handling mechanisms. In emergencies such as excessively high temperatures or abnormal pressure, they cannot be handled promptly, potentially leading to safety accidents. Utility Model Content
[0005] The present invention aims to provide a reaction vessel for the production of polymethyl methacrylate (PMMA) to solve the technical problem that existing reaction vessels cannot simultaneously achieve precise temperature control, efficient stirring and risk prevention.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] 1) A reaction vessel for the production of polymethyl methacrylate (PMMA), comprising a base, the base including an upper base and a lower base, a double-layered reaction vessel body mounted on the upper surface of the upper base, the reaction vessel body including an inner vessel body and an outer vessel body, the inner vessel body and the outer vessel body forming a sandwich, a circulating pipe spirally extending along the axial direction of the reaction vessel body wound within the sandwich, the circulating pipe being filled with synthetic heat transfer oil, the two ends of the circulating pipe having two sets of branch pipes, one set of branch pipes connected to a chiller, and the other set of branch pipes connected to a heat generator, and further including a drive motor, the drive motor being fixed to the upper surface of the outer vessel body, the drive motor having... An output shaft extends through the outer vessel body into the interlayer. The free end of the output shaft is connected to a hollow stirring shaft. The stirring shaft extends through the interlayer to the bottom of the inner vessel body and is connected to the circulation pipe. The stirring shaft is vertically arranged with an upper impeller assembly, a middle impeller assembly, and a lower impeller assembly, all located inside the inner vessel body. The top of the reactor body has a feed inlet and an exhaust pipe, and the bottom of the reactor body has a discharge outlet. A temperature sensor and a pressure sensor are installed inside the inner vessel body. The reactor body also includes an alarm and a microprocessor, with the temperature sensor, pressure sensor, and alarm electrically connected to the microprocessor.
[0008] This utility model adopts a double-layer base structure design, which is composed of an upper base and a lower base. The upper base is used to support the reactor body, while the lower base is used to fix the heating and cooling units. The upper and lower bases cooperate with each other to provide stable support for the entire reactor. The reactor body has a double-layer structure, consisting of an inner reactor body and an outer reactor body, with a sandwich space between them. A circulating pipe extending spirally along the axial direction of the reactor body is arranged in the sandwich space. The circulating pipe is filled with synthetic heat transfer oil, which can transfer heat during circulation. There are two sets of branch pipes at both ends of the circulating pipe. One set of branch pipes is connected to the cooling unit, and the other set of branch pipes is connected to the heating unit, which can realize heating or cooling according to the reaction requirements.
[0009] A drive motor is fixed on the upper surface of the outer vessel body. The drive motor has an output shaft that extends through the outer vessel body into the jacket. The free end of the output shaft is connected to a hollow stirring shaft. The stirring shaft extends through the jacket to the bottom of the inner vessel body. The stirring shaft located in the jacket is connected to the circulation pipe, allowing the heat transfer oil in the circulation pipe to flow into the stirring shaft. While stirring the material, heat can be transferred to the material, further improving the mixing effect and accelerating the reaction process. The stirring shaft is vertically equipped with an upper fan blade assembly, a middle fan blade assembly, and a lower fan blade assembly. All three fan blade assemblies are located inside the inner vessel body. When the stirring shaft rotates, the upper fan blade assembly, the middle fan blade assembly, and the lower fan blade assembly stir the material in the vessel, promoting the mixing of the material.
[0010] The reactor body has an inlet and an exhaust pipe at the top for adding materials and venting gases during the reaction, respectively; and an outlet at the bottom for discharging materials after the reaction. Inside the reactor body are temperature and pressure sensors. The temperature sensor is electrically connected to an alarm and a microprocessor. The temperature sensor continuously collects temperature data and feeds it back to the microprocessor. When the temperature data is abnormal, the microprocessor controls the alarm to sound an alarm, alerting the operator to take appropriate measures. The pressure sensor is also electrically connected to the alarm and the microprocessor. The pressure sensor continuously collects pressure data and transmits it to the microprocessor. When the pressure data is abnormal, the microprocessor triggers the alarm to sound an alarm, alerting the operator to take appropriate measures. This design ensures the safety of the reaction process and reduces the risk of accidents caused by temperature or pressure runaway.
[0011] 2) A reaction vessel for the production of polymethyl methacrylate as described in 1), wherein:
[0012] Both ends of the circulation pipe extend through the bottom of the interlayer to the lower base. One set of branch pipes of the circulation pipe includes a first initial branch pipe and a second initial branch pipe. Another set of branch pipes of the circulation pipe includes a first final branch pipe and a second final branch pipe. The first initial branch pipe and the first final branch pipe are connected to the heating unit, and the second initial branch pipe and the second final branch pipe are connected to the cooling unit. Each of the first initial branch pipe, the second initial branch pipe, the first final branch pipe, and the second final branch pipe is equipped with a first solenoid valve. The heating unit, the cooling unit, and the first solenoid valves are all electrically connected to the microprocessor.
[0013] The branch pipe design of the circulation pipeline in this invention allows the synthetic heat transfer oil to form two independent circulation paths within the jacket, corresponding to heating and cooling functions respectively. This design enables more flexible adjustment of the temperature inside the reactor. The first solenoid valve enables rapid switching and precise control of the circulation path. When the microprocessor receives a signal from the temperature sensor, it can quickly control the corresponding first solenoid valve to open or close, promptly starting the heating or cooling unit and rapidly adjusting the temperature inside the reactor to ensure timely and accurate temperature control.
[0014] By using a microprocessor to coordinate the control of the heating unit, the cooling unit, and the first solenoid valve, the temperature of the reactor can be precisely regulated, ensuring that the reaction temperature better meets the process requirements. This avoids the impact of prolonged excessively high or low temperatures on the reaction process and product quality, while also improving energy efficiency and reducing unnecessary energy consumption.
[0015] 3) A reaction vessel for the production of polymethyl methacrylate as described in 1), wherein:
[0016] The stirring shaft has a flow cavity, the stirring shaft is equipped with a rotary joint, the circulation pipe includes a branch pipe, and the rotary joint is connected to the branch pipe.
[0017] In this invention, the stirring shaft has a flow cavity and is equipped with a rotary joint. The circulation pipe includes a branch pipe located at the top of the jacket. The rotary joint is connected to the branch pipe and can rotate with the stirring shaft, thus realizing the connection between the fixed branch pipe and the rotating stirring shaft. This allows the synthetic heat transfer oil in the branch pipe to flow smoothly into the stirring shaft through the rotary joint, while ensuring that there is no leakage or obstruction of the stirring shaft rotation at the connection point during the rotation of the stirring shaft.
[0018] 4) A reaction vessel for the production of polymethyl methacrylate as described in 1), wherein:
[0019] The upper wind vane assembly includes two downward-sloping blades, the middle wind vane assembly includes two horizontal blades, and the lower wind vane assembly includes two upward-sloping blades. All blades have blade channels distributed along the circumferential direction of the blades. The stirring shaft has a flow cavity, and several through holes are evenly distributed along its axial direction. The positions of the through holes correspond one-to-one with the positions of the blades, and the blade channels are connected to the stirring shaft through the through holes.
[0020] In this invention, the upper impeller assembly includes two downward-sloping blades, the middle impeller assembly includes two horizontal blades, and the lower impeller assembly includes two upward-sloping blades. The design of blades with different tilt angles allows the upper, middle, and lower impeller assemblies to generate stirring forces in different directions when the stirring shaft rotates, thereby creating a more comprehensive and effective stirring effect on the material.
[0021] Each blade has blade channels arranged along the circumferential direction. These blade channels are connected to the stirring shaft. When the synthetic heat transfer oil in the circulation pipe flows into the stirring shaft, it can be further transferred to the blade through the blade channels, realizing the heat transfer function of the blade. During the stirring process, the blade can evenly transfer heat to the material, avoiding local temperature differences and further improving the uniformity and efficiency of the reaction.
[0022] 5) A reaction vessel for the production of polymethyl methacrylate as described in 1), wherein:
[0023] The feed inlet passes through the interlayer and communicates with the inner vessel body. A feed valve that can open and close the feed inlet is installed on the upper part of the feed inlet. The feed valve is electrically connected to the microprocessor.
[0024] In this invention, the feed inlet penetrates the jacket and connects to the inner vessel body, enabling the transport of materials from the outside of the reactor body to the inner vessel body. A feed valve is installed at the top of the feed inlet, which controls the opening and closing of the feed inlet, thereby controlling the material feeding process. The feed valve is electrically connected to a microprocessor, which can send control signals to the feed valve according to the reaction progress and preset programs, reducing manual labor intensity and improving the level of automation and efficiency of production.
[0025] 6) A reaction vessel for the production of polymethyl methacrylate as described in 1), wherein:
[0026] A crossbar is provided in the middle of the stirring shaft, and the central axis of the crossbar is perpendicular to the central axis of the stirring shaft. A vertically arranged scraper is fixedly connected to the end of the crossbar away from the stirring shaft. A gap is reserved between the side wall of the scraper and the inner wall of the inner vessel. An elastic scraper is provided on the side of the scraper facing the inner wall of the inner vessel, and the elastic scraper is in contact with the inner wall of the inner vessel.
[0027] In this invention, a crossbar is provided in the middle of the stirring shaft, and the central axis of the crossbar is perpendicular to the central axis of the stirring shaft. A vertically arranged scraper is fixedly connected to the end of the crossbar away from the stirring shaft. A certain gap is reserved between the side wall of the scraper and the inner wall of the inner vessel. This gap can ensure that the scraper rotates smoothly under the drive of the stirring shaft, and can also make the scraper as close as possible to the inner wall of the inner vessel. An elastic scraper is provided on the side of the scraper facing the inner wall of the inner vessel. The elastic scraper can make close contact with the inner wall of the inner vessel. The elastic scraper has a certain elasticity and can fit tightly against the inner wall of the inner vessel. While scraping off the material, the elastic scraper can avoid causing hard damage to the inner wall of the inner vessel and protect the integrity of the inner wall of the inner vessel.
[0028] During the rotation of the stirring shaft, the stirring shaft drives the crossbar and scraper to rotate together. The elastic scraper continuously scrapes the inner wall of the inner vessel as the scraper rotates, thereby removing the material adhering to the inner wall of the inner vessel and preventing the material from accumulating on the inner wall of the inner vessel. This helps to improve the heat transfer efficiency of the reactor, avoids the problem of poor heat transfer caused by scaling on the inner wall of the inner vessel, and also reduces material waste. It also prevents the adhering material from not being fully mixed, which would lead to unsatisfactory stirring effect, affect the uniformity and speed of the reaction, and thus reduce product quality.
[0029] 7) A reaction vessel for the production of polymethyl methacrylate as described in 1), wherein:
[0030] The inner vessel body has two symmetrically arranged discharge ports at its bottom. The discharge ports are located on both sides of the central axis of the inner vessel body and extend downward to the lower base. Each discharge port is equipped with a discharge valve that can open and close the discharge port. The discharge valve is electrically connected to the microprocessor.
[0031] In this invention, two discharge ports are symmetrically arranged at the bottom of the inner vessel body. These two discharge ports are located on both sides of the central axis of the inner vessel body. The two discharge ports can make the material discharge more evenly, avoiding the problems of uneven discharge and large residual amount, which would reduce the material utilization rate and production efficiency. The discharge ports extend downward to the lower base to provide a channel for material discharge. A discharge valve is installed at the bottom of each discharge port. The discharge valve can control the opening and closing of the discharge port, thereby controlling the material discharge process.
[0032] The discharge valve is electrically connected to the microprocessor. The microprocessor can control the opening and closing of the discharge valve based on the material state after the reaction and the pressure inside the reactor, thereby controlling the material discharge amount and speed. This reduces manual operation, improves production efficiency, and also helps ensure the safety of operators.
[0033] 8) A reaction vessel for the production of polymethyl methacrylate according to 1), wherein:
[0034] The exhaust pipe passes through the interlayer and communicates with the inner vessel body. A one-way valve is provided at one end of the exhaust pipe near the reactor, and a second electromagnetic valve is provided at the other end of the exhaust pipe. The second electromagnetic valve is electrically connected to the microprocessor.
[0035] In this invention, an exhaust pipe extends through the interlayer to the inner vessel, enabling gas communication between the inner vessel and the outside environment for discharging gases generated during the reaction. A one-way valve is installed at the end of the exhaust pipe near the reaction vessel. This valve ensures that gas flows only from the inner vessel towards the exhaust pipe, preventing backflow of external gas into the inner vessel and ensuring the stability of the reaction environment. A second solenoid valve is installed at the other end of the exhaust pipe. This second solenoid valve is electrically connected to a microprocessor, which controls the opening and closing of the second solenoid valve based on the internal gas pressure of the inner vessel, thus controlling the exhaust.
[0036] Compared with the prior art, this utility model also has the following technical effects:
[0037] In this invention, a circulating pipeline, a temperature sensor, a chiller, a heater, and a microprocessor constitute a highly efficient temperature control system. The circulating pipeline within the interlayer connects the chiller and the heater, which provide the cold source and heat source for the temperature control system, respectively. Branch pipelines are provided at both ends of the circulating pipeline, and each branch pipeline is equipped with a first solenoid valve. All first solenoid valves are connected to the microprocessor. When the temperature sensor inside the inner vessel detects a temperature change, the microprocessor quickly controls the first solenoid valves to switch the flow direction of the synthetic heat transfer oil, causing the heater or chiller to start working. This dual-circulation temperature control system can quickly adjust the reaction temperature, ensuring that the reaction takes place at a suitable temperature and avoiding the instability of product quality caused by the material being in a state of excessively high or low temperature for a long time.
[0038] Meanwhile, the deep integration of stirring and heat transfer design within the inner vessel effectively solves the problems of numerous dead zones in stirring and low heat transfer efficiency. The hollow stirring shaft is connected to the circulation pipe via a rotary joint, allowing synthetic heat transfer oil to flow into the stirring shaft. The stirring shaft is equipped with an upper, middle, and lower fan blade assembly. Each of the blades in the upper, middle, and lower fan blade assemblies has a blade pipe connected to the stirring shaft. When the stirring shaft rotates, the upper, middle, and lower fan blade assemblies generate downward, horizontal, and upward stirring forces, respectively, ensuring thorough mixing of the materials. The synthetic heat transfer oil flows through the blade pipes, enabling the blades to transfer heat synchronously during stirring, evenly distributing heat to all parts of the material. Compared to the single stirring and heat transfer method of traditional reactors, this invention significantly improves the uniformity of material mixing and the reaction rate, promoting the full reaction of polymethyl methacrylate to enhance product quality.
[0039] Furthermore, the temperature sensor, alarm, and pressure sensor work in conjunction with the microprocessor to achieve safe control of the reaction process, building a solid safety barrier for the production of polymethyl methacrylate, protecting the lives of production personnel and the property of the company, and promoting the production process towards a safer, more reliable, and stable direction. During the reaction, the temperature and pressure sensors continuously monitor the data, and the microprocessor analyzes and judges the data in real time. Once an abnormality occurs, the alarm is immediately activated and corresponding improvement measures are initiated. After the reaction is completed, the microprocessor can also evaluate the equipment status based on the data fed back by the temperature and pressure sensors to determine whether there are any potential safety hazards. Attached Figure Description
[0040] Figure 1 This is a schematic diagram of the structure of a reaction vessel used in the production of polymethyl methacrylate according to this utility model;
[0041] Figure 2 This is a schematic diagram of the blade structure of a reaction vessel used in the production of polymethyl methacrylate according to this utility model. Detailed Implementation
[0042] The following detailed description illustrates the specific implementation method:
[0043] The reference numerals in the accompanying drawings include: lower base 1, discharge port 2, second first-end branch pipe 3, first first-end branch pipe 4, upper base 5, circulation pipe 6, outer vessel 7, inner vessel 8, stirring shaft 9, blade 10, pressure sensor 11, exhaust pipe 12, drive motor 13, rotary joint 14, branch pipe 15, temperature sensor 16, feed port 17, elastic scraper 18, scraper 19, crossbar 20, first solenoid valve 21, first end branch pipe 22, second end branch pipe 23, heating unit 24, cooling unit 25, through hole 26, blade pipe 27.
[0044] Reference will now be made in detail to the embodiments disclosed herein. Although the disclosure will be described in conjunction with embodiments and / or examples, they are not intended to limit the disclosure to these embodiments and / or examples. Rather, the disclosure covers alternatives, modifications, and equivalents.
[0045] See the example. Figure 1As shown, this embodiment is a reactor used in the production of polymethyl methacrylate (PMMA). It includes a base, comprising an upper base 5 and a lower base 1. A double-layered reactor body is mounted on the upper surface of the upper base 5. The reactor body includes an inner vessel 8 and an outer vessel 7, forming a sandwich layer. A circulating pipe 6, spirally extending along the axial direction of the reactor body, is wound within the sandwich layer. The circulating pipe 6 is filled with synthetic heat transfer oil. Two sets of branch pipes are located at both ends of the circulating pipe 6. One set of branch pipes is connected to a chiller 25, and the other set of branch pipes is connected to a heater 24. The reactor also includes a drive motor 13, which is fixed to the upper surface of the outer vessel 7. The motor 13 has an output shaft that extends through the outer vessel body 7 into the interlayer. The free end of the output shaft is connected to a hollow stirring shaft 9. The stirring shaft 9 extends through the interlayer to the bottom of the inner vessel body 8. The stirring shaft 9 is connected to the circulation pipe 6. The stirring shaft 9 is vertically arranged with an upper impeller group, a middle impeller group, and a lower impeller group. The upper impeller group, the middle impeller group, and the lower impeller group are all located inside the inner vessel body 8. The top of the reactor body is provided with a feed inlet 17 and an exhaust pipe 12. The bottom of the reactor body is provided with a discharge outlet 2. A temperature sensor 16 and a pressure sensor 11 are installed inside the inner vessel body 8. It also includes an alarm and a microprocessor. The temperature sensor 16, the pressure sensor 11, and the alarm are electrically connected to the microprocessor.
[0046] This utility model adopts a double-layer base structure design, which is composed of an upper base 5 and a lower base 1. The upper base 5 is used to support the reactor body, while the lower base 1 is used to fix the heating unit 24 and the cooling unit 25. The upper base 5 and the lower base 1 cooperate with each other to provide stable support for the entire reactor. The reactor body has a double-layer structure, consisting of an inner reactor body 8 and an outer reactor body 7. An interlayer space is formed between the inner reactor body 8 and the outer reactor body 7. A circulation pipe 6 is spirally extended along the axial direction of the reactor body in the interlayer space. The circulation pipe 6 is filled with synthetic heat transfer oil, which can transfer heat during circulation. There are two sets of branch pipes at both ends of the circulation pipe 6. One set of branch pipes is connected to the cooling unit 25, and the other set of branch pipes is connected to the heating unit 24, which can realize heating or cooling according to the reaction requirements.
[0047] A drive motor 13 is fixed on the upper surface of the outer vessel body 7. The drive motor 13 has an output shaft that extends through the outer vessel body 7 into the jacket. The free end of the output shaft is connected to a hollow stirring shaft 9. The stirring shaft 9 extends through the jacket to the bottom of the inner vessel body 8. The stirring shaft 9 located in the jacket is connected to the circulation pipe 6, so that the heat transfer oil in the circulation pipe 6 can flow into the interior of the stirring shaft 9. While stirring the material, heat can be transferred to the material, further improving the mixing effect of the material and accelerating the reaction process. The stirring shaft 9 is vertically equipped with an upper fan blade group, a middle fan blade group, and a lower fan blade group. The upper fan blade group, the middle fan blade group, and the lower fan blade group are all located inside the inner vessel body 8. When the stirring shaft 9 rotates, the upper fan blade group, the middle fan blade group, and the lower fan blade group stir the material in the vessel and promote the mixing of the material.
[0048] The reactor body has an inlet 17 and an exhaust pipe 12 at the top for adding materials and venting gases during the reaction, respectively; and an outlet 2 at the bottom for discharging materials after the reaction. The inner reactor body 8 is equipped with a temperature sensor 16 and a pressure sensor 11. The temperature sensor 16 is electrically connected to an alarm and a microprocessor, continuously collecting temperature data and feeding it back to the microprocessor. When the temperature data is abnormal, the microprocessor controls the alarm to sound an alarm, reminding the operator to take appropriate measures. The pressure sensor 11 is also electrically connected to the alarm and the microprocessor, continuously collecting pressure data and transmitting it to the microprocessor. When the pressure data is abnormal, the microprocessor triggers the alarm to sound an alarm, reminding the operator to take appropriate measures. This design ensures the safety of the reaction process and reduces the risk of accidents caused by temperature or pressure runaway.
[0049] Both ends of the circulation pipe 6 extend through the bottom of the interlayer to the lower base 1. One set of branch pipes of the circulation pipe 6 includes a first head branch pipe 4 and a second head branch pipe 3. Another set of branch pipes of the circulation pipe 6 includes a first tail branch pipe 22 and a second tail branch pipe 23. The first head branch pipe 4 and the first tail branch pipe 22 are connected to the heating unit 24, and the second head branch pipe 3 and the second tail branch pipe 23 are connected to the cooling unit 25. The first head branch pipe 4, the second head branch pipe 3, the first tail branch pipe 22, and the second tail branch pipe 23 are all equipped with a first solenoid valve 21. The heating unit 24, the cooling unit 25, and the first solenoid valve 21 are all electrically connected to the microprocessor.
[0050] The branch pipe design of the circulation pipe 6 in this invention allows the synthetic heat transfer oil to form two independent circulation paths within the jacket, corresponding to heating and cooling functions respectively. This design enables more flexible adjustment of the temperature inside the reactor. The first solenoid valve 21 enables rapid switching and precise control of the circulation path. When the microprocessor receives the signal from the temperature sensor 16, it can quickly control the corresponding first solenoid valve 21 to open or close, promptly starting the heating unit 24 or the cooling unit 25 to quickly adjust the temperature inside the reactor, ensuring the timeliness and accuracy of temperature control.
[0051] In this invention, the heating unit adopts an Orland thermal oil electric heater, and the cooling unit adopts a Kelida LC-04 chiller. Through the coordinated control of the heating unit 24, the cooling unit 25, and the first solenoid valve 21 by the microprocessor, the temperature of the reactor can be precisely adjusted, so that the reaction temperature better meets the process requirements, avoiding the impact of excessively high or low temperatures on the reaction process and product quality for a long time. At the same time, it also improves energy utilization efficiency and reduces unnecessary energy consumption.
[0052] The stirring shaft 9 has a flow cavity inside, and the stirring shaft 9 is equipped with a rotary joint 14. The circulation pipe 6 includes a branch pipe 15, and the rotary joint 14 is connected to the branch pipe 15.
[0053] In this invention, the stirring shaft 9 has a flow cavity inside, and the stirring shaft 9 is equipped with a rotary joint 14. The circulation pipe 6 includes a branch pipe 15 set at the top of the interlayer. The rotary joint 14 is connected to the branch pipe 15 and can rotate with the stirring shaft 9, realizing the connection between the fixed branch pipe 15 and the rotating stirring shaft 9. This allows the synthetic heat transfer oil in the branch pipe 15 to flow smoothly into the interior of the stirring shaft 9 through the rotary joint 14, while ensuring that there is no leakage or obstruction of the stirring shaft 9 at the connection point during the rotation of the stirring shaft 9.
[0054] The upper wind blade assembly includes two downward-sloping blades 10, the middle wind blade assembly includes two horizontal blades 10, and the lower wind blade assembly includes two upward-sloping blades 10. All blades 10 have blade channels 27 distributed along the circumferential direction of the blades 10. The stirring shaft 9 has a flow cavity. Several through holes 26 are evenly distributed along the axial direction of the stirring shaft 9. The positions of the through holes 26 correspond one-to-one with the positions of the blades 10. The blade channels 27 are connected to the stirring shaft 9 through the through holes 26.
[0055] In this invention, the upper impeller assembly includes two downward-sloping blades 10, the middle impeller assembly includes two horizontally positioned blades 10, and the lower impeller assembly includes two upward-sloping blades 10. The design of blades 10 with different tilt angles allows the upper, middle, and lower impeller assemblies to generate stirring forces in different directions when the stirring shaft 9 rotates, thereby creating a more comprehensive and effective stirring effect on the material.
[0056] Each blade 10 has a blade channel 27 arranged along the circumferential direction of the blade 10. These blade channels 27 are connected to the stirring shaft 9. When the synthetic heat transfer oil in the circulation pipe 6 flows into the stirring shaft 9, it can be further transferred to the blade 10 through the blade channel 27, realizing the heat transfer function of the blade 10. During the stirring process, the blade 10 can evenly transfer heat to the material, avoid local temperature differences, and further improve the uniformity and efficiency of the reaction.
[0057] The feed inlet 17 passes through the jacket and is connected to the inner vessel body 8. A feed valve that can open and close the feed inlet 17 is installed on the upper part of the feed inlet 17. The feed valve is electrically connected to the microprocessor.
[0058] In this invention, the feed inlet 17 penetrates the interlayer and communicates with the inner vessel body 8, realizing the conveying of materials from the outside of the reactor body to the inner vessel body 8; a feed valve is installed at the top of the feed inlet 17, which can control the opening and closing of the feed inlet 17, thereby controlling the feeding process of materials. The feed valve is electrically connected to a microprocessor, which can send control signals to the feed valve according to the reaction process and preset program, reducing the intensity of manual labor and improving the level of automation and efficiency of production.
[0059] A crossbar 20 is provided in the middle of the stirring shaft 9. The central axis of the crossbar 20 is perpendicular to the central axis of the stirring shaft 9. A vertically arranged scraper 19 is fixedly connected to the end of the crossbar 20 away from the stirring shaft 9. A gap is reserved between the side wall of the scraper 19 and the inner wall of the inner vessel 8. An elastic scraper 18 is provided on the side of the scraper 19 facing the inner wall of the inner vessel 8. The elastic scraper 18 contacts the inner wall of the inner vessel 8.
[0060] In this invention, a crossbar 20 is provided in the middle of the stirring shaft 9, and the central axis of the crossbar 20 is perpendicular to the central axis of the stirring shaft 9. A vertically arranged scraper 19 is fixedly connected to the end of the crossbar 20 away from the stirring shaft 9. A certain gap is reserved between the side wall of the scraper 19 and the inner wall of the inner vessel 8. This gap can ensure that the scraper 19 can rotate smoothly under the drive of the stirring shaft 9, and can also make the scraper 19 as close as possible to the inner wall of the inner vessel 8. An elastic scraper 18 is provided on the side of the scraper 19 facing the inner wall of the inner vessel 8. The elastic scraper 18 can make close contact with the inner wall of the inner vessel 8. The elastic scraper 18 has a certain elasticity and can fit tightly against the inner wall of the inner vessel 8. While scraping off the material, the elastic scraper 18 can avoid causing hard damage to the inner wall of the inner vessel 8 and protect the integrity of the inner wall of the inner vessel 8.
[0061] During the rotation of the stirring shaft 9, the stirring shaft 9 drives the crossbar 20 and the scraper 19 to rotate together. The elastic scraper 18 continuously scrapes the inner wall of the inner vessel 8 as the scraper 19 rotates, thereby removing the material adhering to the inner wall of the inner vessel 8, preventing the material from accumulating on the inner wall of the inner vessel 8, which helps to improve the heat transfer efficiency of the reactor, avoids the problem of poor heat transfer caused by scaling on the inner wall of the inner vessel 8, and also reduces material waste. It also prevents the adhering material from not being fully mixed, resulting in unsatisfactory stirring effect, affecting the uniformity and speed of the reaction, and thus reducing product quality.
[0062] Two discharge ports 2 are symmetrically arranged at the bottom of the inner vessel body 8. The discharge ports 2 are located on both sides of the central axis of the inner vessel body 8. Both discharge ports 2 extend downward to the lower base 1. A discharge valve that can open and close the discharge port 2 is installed at the bottom of each discharge port 2. The discharge valve is electrically connected to the microprocessor.
[0063] In this invention, two discharge ports 2 are symmetrically arranged at the bottom of the inner vessel body 8. These two discharge ports 2 are located on both sides of the central axis of the inner vessel body 8. The two discharge ports 2 can make the material discharge more evenly, avoiding the problem of uneven discharge and large residual amount, which would reduce the utilization rate and production efficiency of the material. The discharge ports 2 extend downward to the lower base 1 to provide a channel for the discharge of the material. A discharge valve is installed at the bottom of each discharge port 2. The discharge valve can control the opening and closing of the discharge port 2, thereby controlling the material discharge process.
[0064] The discharge valve is electrically connected to the microprocessor. The microprocessor can control the opening and closing of the discharge valve based on the material state after the reaction and the pressure inside the reactor, thereby controlling the material discharge amount and speed. This reduces manual operation, improves production efficiency, and also helps ensure the safety of operators.
[0065] The exhaust pipe 12 passes through the interlayer and is connected to the inner vessel body 8. A one-way valve is provided at one end of the exhaust pipe 12 near the reactor, and a second electromagnetic valve is provided at the other end of the exhaust pipe 12. The second electromagnetic valve is electrically connected to the microprocessor.
[0066] In this invention, the exhaust pipe 12 extends through the interlayer to the inner vessel 8, enabling gas communication between the inner vessel 8 and the outside environment for discharging gases generated during the reaction process. A one-way valve is provided at one end of the exhaust pipe 12 near the reaction vessel. This one-way valve ensures that gas can only flow from the inner vessel 8 towards the exhaust pipe 12, preventing backflow of external gas into the inner vessel 8 and ensuring the stability of the reaction environment. A second solenoid valve is provided at the other end of the exhaust pipe 12. This second solenoid valve is electrically connected to a microprocessor. The microprocessor can control the opening and closing of the second solenoid valve based on the internal gas pressure of the inner vessel 8, thereby controlling the exhaust.
[0067] The above are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A reaction vessel for the production of polymethyl methacrylate, comprising a base, characterized in that, The base includes an upper base and a lower base. A double-layered reactor body is mounted on the upper surface of the upper base. The reactor body includes an inner vessel and an outer vessel, forming a sandwich layer. A circulating pipe, spirally extending along the axial direction of the reactor body, is wound within the sandwich layer. The circulating pipe is filled with synthetic heat transfer oil. Each end of the circulating pipe has two sets of branch pipes; one set of branch pipes is connected to a chiller, and the other set is connected to a heat generator. The base also includes a drive motor, which is fixed to the upper surface of the outer vessel. The drive motor extends through the outer vessel and into the sandwich layer. The inner reactor has an output shaft with a hollow stirring shaft connected to its free end. The stirring shaft extends through the interlayer to the bottom of the inner vessel and is connected to the circulation pipe. The stirring shaft has an upper impeller assembly, a middle impeller assembly, and a lower impeller assembly arranged vertically. The upper impeller assembly, the middle impeller assembly, and the lower impeller assembly are all located inside the inner vessel. The top of the reactor body has a feed inlet and an exhaust pipe, and the bottom of the reactor body has a discharge outlet. The inner vessel body is equipped with a temperature sensor and a pressure sensor, as well as an alarm and a microprocessor. The temperature sensor, the pressure sensor, and the alarm are electrically connected to the microprocessor.
2. The reaction vessel for the production of polymethyl methacrylate according to claim 1, characterized in that, Both ends of the circulation pipe extend through the bottom of the interlayer to the lower base. One set of branch pipes of the circulation pipe includes a first initial branch pipe and a second initial branch pipe. Another set of branch pipes of the circulation pipe includes a first final branch pipe and a second final branch pipe. The first initial branch pipe and the first final branch pipe are connected to the heating unit, and the second initial branch pipe and the second final branch pipe are connected to the cooling unit. Each of the first initial branch pipe, the second initial branch pipe, the first final branch pipe, and the second final branch pipe is equipped with a first solenoid valve. The heating unit, the cooling unit, and the first solenoid valves are all electrically connected to the microprocessor.
3. The reaction vessel for the production of polymethyl methacrylate according to claim 1, characterized in that, The stirring shaft has a flow cavity, the stirring shaft is equipped with a rotary joint, the circulation pipe includes a branch pipe, and the rotary joint is connected to the branch pipe.
4. The reaction vessel for the production of polymethyl methacrylate according to claim 1, characterized in that, The upper wind vane assembly includes two downward-sloping blades, the middle wind vane assembly includes two horizontal blades, and the lower wind vane assembly includes two upward-sloping blades. All blades have blade channels distributed along the circumferential direction of the blades. The stirring shaft has a flow cavity, and several through holes are evenly distributed along its axial direction. The positions of the through holes correspond one-to-one with the positions of the blades, and the blade channels are connected to the stirring shaft through the through holes.
5. The reaction vessel for the production of polymethyl methacrylate according to claim 1, characterized in that, The feed inlet passes through the interlayer and communicates with the inner vessel body. A feed valve that can open and close the feed inlet is installed on the upper part of the feed inlet. The feed valve is electrically connected to the microprocessor.
6. The reaction vessel for the production of polymethyl methacrylate according to claim 1, characterized in that, A crossbar is provided in the middle of the stirring shaft, and the central axis of the crossbar is perpendicular to the central axis of the stirring shaft. A vertically arranged scraper is fixedly connected to the end of the crossbar away from the stirring shaft. A gap is reserved between the side wall of the scraper and the inner wall of the inner vessel. An elastic scraper is provided on the side of the scraper facing the inner wall of the inner vessel, and the elastic scraper is in contact with the inner wall of the inner vessel.
7. The reaction vessel for the production of polymethyl methacrylate according to claim 1, characterized in that, The inner vessel body has two symmetrically arranged discharge ports at its bottom. The discharge ports are located on both sides of the central axis of the inner vessel body and extend downward to the lower base. Each discharge port is equipped with a discharge valve that can open and close the discharge port. The discharge valve is electrically connected to the microprocessor.
8. The reaction vessel for the production of polymethyl methacrylate according to claim 1, characterized in that, The exhaust pipe passes through the interlayer and communicates with the inner vessel body. A one-way valve is provided at one end of the exhaust pipe near the reactor, and a second electromagnetic valve is provided at the other end of the exhaust pipe. The second electromagnetic valve is electrically connected to the microprocessor.