A high-efficiency stirring mechanical device specifically for carbonylation reactions

Abstract

This invention relates to the field of carbonylation reaction for preparing carboxylic esters, specifically a high-efficiency stirring mechanical device for carbonylation reactions. It includes a reaction mechanism and a coil mounted on the outside of the reaction mechanism. Inside the reaction mechanism, a stirring mechanism is rotatably mounted for stirring during the carbonylation reaction. The stirring mechanism includes a stirring shaft and a fixed frame fixedly connected to the bottom of the stirring shaft. Symmetrically arranged first stirring elements are rotatably connected to both sides of the fixed frame. This invention drives the stirring shaft to rotate via a drive component, which in turn drives the first, third, and second stirring elements to rotate synchronously. The large-sized blades of the first stirring element promote overall circulation of the material throughout the reactor, and the spiral arrangement of the third stirring element provides axial circulation capability, thereby improving the overall processing effect of the material. Simultaneously, the toothed protrusions on the outer sides of the third and second stirring elements break up air bubbles during rotation, increasing the gas-liquid contact area.

Description

Technical Field

[0001] This invention relates to the field of carbonylation reaction for the preparation of carboxylic acid esters, specifically to a high-efficiency stirring mechanical device for carbonylation reactions. Background Technology

[0002] Carbonylation is one of the most important catalytic reactions in the chemical industry, and it is widely used in the synthesis of chemical products such as carboxylic acids and esters. Carbonylation usually requires the participation of gases such as carbon monoxide and belongs to a typical gas-liquid heterogeneous reaction system. This places high demands on the mixing and mass transfer performance of the reaction mechanism. Carbonylation is the process of introducing carbonyl groups (C=O) into the substrate molecule. In most reactions, the total bond energy of the reactants is lower than that of the products. Excess energy during the reaction is released as heat. Most existing carbonylation reactions are processed using mechanical stirring mechanisms. The main components include a reaction vessel for processing and a stirring mechanism installed inside the reaction vessel. The materials to be processed are mixed by stirring blades. The stirring mechanism is driven by a drive unit. Coils are installed on the outside of the reaction vessel to cool the materials to be processed.

[0003] Most existing stirring mechanisms use anchor-type impellers for stirring. The low-speed operation of anchor-type impellers can reduce catalyst structure damage, and the large-sized impeller blades can promote the overall circulation of materials in the reactor, extending the gas residence time. Although this can meet the stirring requirements of carbonylation reactions to a certain extent, as the reaction proceeds, larger molecular weight carboxylic acid ester products are gradually generated and accumulated, the intermolecular forces of the system increase, and the viscosity gradually increases with the increase of product concentration. Since most existing anchor-type impellers are vertically set, the resistance encountered by the anchor-type impeller during rotation gradually increases, thus requiring more energy to complete the stirring process. At the same time, the axial circulation capability of high-viscosity materials is weak, and stratification is prone to occur, resulting in poor gas-liquid mixing and thus prolonging the reaction time.

[0004] Therefore, the present invention provides a high-efficiency stirring mechanical device specifically designed for carbonylation reactions that adapts to changes in carbonylation reaction concentration and can improve gas-liquid mixing effect. Summary of the Invention

[0005] To address the problem that existing anchor-type agitators cannot adapt to concentration changes during carbonylation reactions, a high-efficiency stirring mechanical device specifically designed for carbonylation reactions has been developed.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a high-efficiency stirring mechanical device for carbonylation reaction, including a reaction mechanism and a coil arranged outside the reaction mechanism. The reaction mechanism is rotatably arranged with a stirring mechanism for stirring during the carbonylation reaction. The stirring mechanism includes a stirring shaft and a fixed frame fixedly connected to the bottom of the stirring shaft. First stirring elements are symmetrically arranged on both sides of the fixed frame. The fixed frame includes a fixed part connected to the stirring shaft and fixed shafts fixedly connected to both sides of the fixed part. Several sets of auxiliary adjustment parts are provided on the outside of the fixed shafts. As the viscosity increases during the carbonylation reaction, the first stirring element is rotated by resistance and the rotation amplitude of the first stirring element is limited, thereby reducing the equipment energy consumption caused by the increase in viscosity during the carbonylation reaction. The fixed frame is fixedly connected to an auxiliary stirring part arranged in a spiral to improve the axial circulation capability of the processed material. The auxiliary stirring part is provided with toothed protrusions on the outside to break up bubbles and increase the gas-liquid contact area as the fixed frame rotates, thereby improving the gas-liquid mixing effect and further improving the carbonylation reaction efficiency.

[0007] Furthermore, the stirring mechanism also includes a scraper assembly disposed on the side of the first stirring member near the inner wall of the reaction mechanism, a second stirring member fixedly connected to the upper end of the stirring shaft, used to improve the stirring effect on the upper material, and an auxiliary stirring part including a third stirring member fixedly connected to both ends of the fixed frame.

[0008] Furthermore, the fixed frame also includes several sets of adjusting protrusions arranged on the outside of the fixed shaft, the fixed part includes a first fixing member fixedly connected to the upper end of the fixed shaft and a second fixing member fixedly connected to the lower end of the fixed shaft, the auxiliary adjusting part includes several sets of first adjusting grooves opened on the outside of the fixed shaft, several sets of limiting blocks protruding on the outside of the fixed shaft, a limiting ring fixedly connected inside the limiting block, and a first elastic member fixedly connected inside the limiting block.

[0009] Furthermore, the ends of the first and second fixing members away from the fixed shaft are rotatably connected to the stirring shaft. The first adjusting groove is used to assist the rotation adjustment of the first stirring member. The limiting block is used to limit the rotation amplitude of the first stirring member. The limiting ring is used to assist the rotation of the first stirring member. The first elastic member is used to compress and reset with the rotation of the first stirring member. The adjusting protrusion is used to assist the scraper assembly in position adjustment.

[0010] Furthermore, the first stirring component includes several sets of adjusting blocks arranged inside the first adjusting groove, with the adjusting blocks having annular adjusting holes that pass through the limiting ring. The first stirring component also includes several sets of second adjusting grooves arranged inside the adjusting protrusions and a third adjusting groove arranged inside the scraper assembly. The first stirring component is also fixedly connected with snap fasteners symmetrically arranged around the scraper assembly.

[0011] Furthermore, the scraper assembly includes a scraper component that is slidably connected to the inside of the first stirring component at one end. A symmetrically arranged abutting component is fixedly connected to one side of the scraper component inside the first stirring component. A symmetrically arranged sliding block is fixedly connected to the middle of one side of the scraper component inside the first stirring component. A symmetrically arranged second elastic component is fixedly connected to the side of the sliding block near the scraper component.

[0012] Furthermore, the third adjustment groove is used for sliding adjustment of the sliding block, the second elastic element is located inside the third adjustment groove, and several sets of abutting elements are provided about the adjustment protrusion. The end of the abutting element away from the scraper element is connected to the outer side of the abutting element, and the buckling elements are symmetrically arranged about the sliding block.

[0013] Furthermore, the second stirring component includes several sets of stirring blades arranged around the circumference of the stirring shaft, the stirring blades being inclined about the stirring shaft, and the stirring blades having a uniformly distributed first toothed edge on the upper side, and the third stirring component includes a second toothed edge on the upper side.

[0014] Furthermore, the reaction mechanism includes a tank and an end cap fixedly connected to the upper end of the tank. A drive unit for driving the stirring mechanism to rotate is fixedly connected to the upper end of the end cap, and a coil is fixedly connected to the outside of the tank.

[0015] The beneficial effects of this invention are: The present invention discloses a high-efficiency stirring mechanical device for carbonylation reaction. A driving component drives a stirring shaft to rotate. As the stirring shaft rotates, a fixed frame drives a first stirring component to rotate. Simultaneously, the stirring shaft drives a third stirring component and a second stirring component to rotate synchronously. The large-sized blades of the first stirring component push the material in the entire reactor to form an overall circulation. The spiral setting of the auxiliary stirring part provides axial circulation capability for the material, thereby improving the overall processing effect of the material. At the same time, the toothed protrusions on the outer side of the third and second stirring components break up air bubbles during rotation to increase the gas-liquid contact area, thereby improving the gas-liquid mixing effect and further improving the carbonylation reaction efficiency. As processing time increases, larger molecular weight carboxylic acid ester products are gradually generated and accumulated within the material, strengthening the intermolecular forces and causing the viscosity to gradually increase with the product concentration. At this point, the resistance experienced by the first agitator increases accordingly. The first agitator rotates around a fixed axis due to the resistance, limiting the rotation amplitude. As the first agitator rotates, the resistance decreases, preventing the energy consumption of the existing anchor-type agitator from gradually increasing due to the increased viscosity during the carbonylation reaction. Simultaneously, the scraper assembly on the first agitator can automatically adjust its position as the agitator rotates. By contacting the adjusting protrusion, the scraper assembly is kept in contact with the inner wall of the tank, scraping away the adhering material and preventing material accumulation from affecting the heat exchange efficiency of the outer coil, thus ensuring a stable reaction temperature. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional view of the tank body of the present invention; Figure 3 This is a top view of the internal structure of the tank of the present invention; Figure 4 This is a schematic diagram of the stirring mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of a portion at point A; Figure 6 For the present invention Figure 4 A magnified view of section B; Figure 7 This is a schematic diagram of the fixed frame structure of the present invention; Figure 8 For the present invention Figure 7 A magnified view of a portion at point C; Figure 9 This is a schematic diagram of the structure of the first stirring element and scraper assembly of the present invention; Figure 10 This is a top view of the structure of the first stirring element and scraper assembly of the present invention; Figure 11 This is a cross-sectional view of the first stirring component of the present invention; Figure 12 This is a partial structural cross-sectional view of the first stirring element and the fixed shaft of the present invention; Figure 13 This is a schematic diagram of the structure of the abutting member and the adjusting protrusion when they are in contact. Figure 14 This is a top view of the scraper assembly structure of the present invention; Figure 15 This is a top view of the structure of the first stirring element of the present invention; Figure 16 This is a schematic diagram of the structure of the first stirring element of the present invention; Figure 17 For the present invention Figure 16 A partially enlarged sectional view at point D; Figure 18 This is a schematic diagram of the buckle structure of the present invention; Figure 19 This is a schematic diagram of the scraper assembly structure of the present invention.

[0018] In the diagram: 1. Reaction mechanism; 11. Tank body; 12. End cap; 2. Drive component; 3. Coil; 4. Stirring mechanism; 41. Stirring shaft; 42. Fixing frame; 421. First fixing component; 422. Second fixing component; 423. Fixing shaft; 424. First adjusting groove; 425. Limiting block; 426. Limiting ring; 427. First elastic component; 428. Adjusting protrusion; 43. First stirring component; 431. Adjusting block; 432. Adjusting hole; 433. Second adjusting groove; 434. Third adjusting groove; 435. Fastening component; 44. Scraper assembly; 441. Scraper component; 442. Abutting component; 443. Sliding block; 444. Second elastic component; 45. Second stirring component; 451. Stirring blade; 452. First toothed edge; 46. Third stirring component; 461. Second toothed edge. Detailed Implementation

[0019] To make the technical means, technical features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Example: Figures 1-19 As shown, the present invention discloses a high-efficiency stirring mechanical device for carbonylation reaction, comprising a reaction mechanism 1 and a coil 3 disposed outside the reaction mechanism 1. A stirring mechanism 4 is rotatably disposed inside the reaction mechanism 1 for stirring during the carbonylation reaction. The stirring mechanism 4 includes a stirring shaft 41 and a fixed frame 42 fixedly connected to the bottom of the stirring shaft 41. Symmetrically arranged first stirring elements 43 are rotatably connected to both sides of the fixed frame 42. The fixed frame 42 includes a fixed part connected to the stirring shaft 41 and fixed shafts 423 fixedly connected to both sides of the fixed part. Several sets of auxiliary adjustment parts are disposed outside the fixed shafts 423, used to adjust the rotation of the first stirring elements 43 by resistance as the viscosity increases during the carbonylation reaction, and to limit the rotation amplitude of the first stirring elements 43. A spirally arranged auxiliary stirring part is fixedly connected outside the fixed frame 42 to improve the axial circulation capability of the processed material. The auxiliary stirring part has toothed protrusions on its outer side to break bubbles and increase the gas-liquid contact area as it rotates with the fixed frame 42.

[0021] Specifically, in this embodiment, the stirring mechanism 4 rotates in a forward direction. The reaction mechanism 1 includes a tank 11 and an end cap 12 fixedly connected to the upper end of the tank 11. A driving component 2 for driving the stirring mechanism 4 to rotate is fixedly connected to the upper end of the end cap 12. A coil 3 is fixedly connected to the outside of the tank 11. The coil 3 is used to cool and control the temperature of the material processed inside the reactor, because heat is generated during the carbonylation reaction, and a certain amount of heat is also generated during stirring. The reaction mechanism 1 is a reactor used for the carbonylation reaction to prepare carboxylic acid esters, and it has a good sealing effect. The driving component 2 can be set as a drive motor and a reducer to drive the stirring shaft 41 to rotate. The coil 3 is semi-circular. The spiral pipe is used to introduce a medium to heat or cool the material inside the reactor, ensuring good processing effect. The stirring mechanism 4 is used to process the material for carbonylation reaction to prepare carboxylic esters, while ensuring good gas-liquid mixing effect. Carbonylation reaction refers to the transformation process of introducing carbonyl (C=O) into the substrate molecule in the presence of a catalyst. It is an important route for preparing carbonyl compounds (including carboxylic esters) and can provide high-value-added and high-purity products. The carbonylation preparation of carboxylic esters usually uses CO or CO2 as carbonyl source. Under the action of transition metal (palladium, cobalt, rhodium, etc.) catalyst, the substrate and alcohol undergo addition or coupling reaction to generate the target ester. During processing, the driving component 2 drives the stirring shaft 41 to rotate. As the stirring shaft 41 rotates, the fixed frame 42 drives the first stirring component 43 to rotate. At the same time, the stirring shaft 41 drives the auxiliary stirring part to rotate synchronously. During the carbonylation reaction, the material is initially in a low viscosity state. The large-sized blades of the first stirring component 43 push the material in the entire reactor to form an overall circulation. The spiral setting of the auxiliary stirring part provides axial circulation capability for the material, thereby improving the overall processing effect of the material. At the same time, the toothed protrusions on the outside of the auxiliary stirring part break up air bubbles during rotation to increase the gas-liquid contact area, thereby improving the gas-liquid mixing effect and further improving the carbonylation reaction efficiency. As the processing time increases, larger molecular weight carboxylic acid ester products are gradually generated and accumulated inside the material. The intermolecular forces of the system are enhanced, and the viscosity gradually increases with the increase of product concentration. At this time, the resistance of the first stirring component 43 increases accordingly. The resistance drives the first stirring component 43 to rotate around the fixed shaft 423 for adjustment and limits the rotation amplitude of the first stirring component 43. As the first stirring component 43 rotates, the resistance decreases, thereby reducing the equipment energy consumption caused by the increase in viscosity during the carbonylation reaction.

[0022] In this embodiment, the stirring mechanism 4 also includes a scraper assembly 44 disposed on the side of the first stirring member 43 near the inner wall of the reaction mechanism 1, and a second stirring member 45 fixedly connected to the upper end of the stirring shaft 41 to improve the stirring effect on the upper material. The auxiliary stirring part includes a third stirring member 46 fixedly connected to both ends of the fixed frame 42.

[0023] Specifically, such as Figures 2-7 As shown, the fixed shaft 423 is located inside the first stirring member 43 on the side away from the inner wall of the tank 11, so that the rotation direction of the first stirring member 43 is opposite to the overall rotation direction of the stirring mechanism 4. The maximum rotation amplitude of the first stirring member 43 is set to 20° to avoid the stirring effect from decreasing due to excessive rotation amplitude. At the same time, excessive rotation amplitude of the first stirring member 43 will cause the distance between the scraper assembly 44 and the tank 11 to be too large and difficult to adjust, thus making it difficult to maintain the scraping effect of the scraper assembly 44 on the material adhering to the inner wall of the tank 11. The upper end of the first stirring member 43 is sealed with the first fixing member 421 and the lower end is sealed with the second fixing member 422 to prevent the processed material from entering the interior of the first stirring member 43. The scraper member 441 is sealed with the first stirring member 43 to prevent the processed material from entering the interior of the first stirring member 43 when the scraper member 441 is adjusted. The fixed frame 42 is used to install the first stirring component 43 and the third stirring component 46 for stirring. The first stirring component 43 is initially set vertically, and the side near the inner wall of the tank 11 has an arc to reduce the resistance during rotation. The scraper assembly 44 is used to scrape off the material adhering to the inner wall of the tank 11 to prevent accumulation and reduce the cooling effect of the coil 3. The second stirring component 45 includes several sets of stirring blades 451 arranged around the circumference of the stirring shaft 41. The third stirring component 46 is spirally arranged and distributed on both sides of the fixed frame 42 to lift the material axially. The stirring effect is achieved by tilting the stirring blades 451 about the stirring shaft 41. The stirring blades 451 are used to assist in stirring the upper material and improve the axial stirring effect of the material. The stirring blades 451 have a uniformly distributed first toothed edge 452 on the upper side. The third stirring element 46 includes a uniformly distributed second toothed edge 461 on the upper side. The first toothed edge 452 and the second toothed edge 461 are used to break up air bubbles to increase the gas-liquid mixing effect inside the material, thereby improving the reaction effect and reaction rate of the carbonylation reaction.

[0024] In this embodiment, the fixed frame 42 further includes a plurality of sets of adjusting protrusions 428 provided on the outside of the fixed shaft 423. The fixing part includes a first fixing member 421 fixedly connected to the upper end of the fixed shaft 423 and a second fixing member 422 fixedly connected to the lower end of the fixed shaft 423. The auxiliary adjusting part includes a plurality of sets of first adjusting grooves 424 opened on the outside of the fixed shaft 423. A plurality of sets of limiting blocks 425 protrude on the outside of the fixed shaft 423. A limiting ring 426 is fixedly connected inside the limiting block 425. A first elastic member 427 is fixedly connected inside the limiting block 425. The reaction mechanism 1 includes a tank 11 and an end cap 12 fixedly connected to the upper end of the tank 11. A driving member 2 for driving the stirring mechanism 4 to rotate is fixedly connected to the upper end of the end cap 12. The coil 3 is fixedly connected to the outside of the tank 11.

[0025] Specifically, such as Figures 1-3 and Figure 7 , Figure 8 As shown, the ends of the first fixing member 421 and the second fixing member 422 away from the fixing shaft 423 are rotatably connected to the stirring shaft 41. The first adjusting groove 424 is used to assist the first stirring member 43 in rotational adjustment. The limiting block 425 is used to limit the rotation amplitude of the first stirring member 43. The limiting ring 426 is used to assist the first stirring member 43 in rotation. The first elastic member 427 is used to compress and reset with the rotation of the first stirring member 43. The adjusting protrusion 428 is used to assist the scraper assembly 44 in position adjustment. The outer sides of the first fixing member 421 and the second fixing member 422 are designed with arcs to reduce the rotational resistance during stirring. The upper and lower ends of the fixing shaft 423 are fixedly connected to the first fixing member 421 and the second fixing member 422 respectively. The first fixing member 421 and the second fixing member 422 are symmetrically arranged about the stirring shaft 41. The first adjusting groove 424 is used to rotate with the protrusion inside the first stirring member 43. At the same time, when the first stirring member 43 rotates due to resistance, it can rotate inside the first adjusting groove 424. At the same time, the limiting block 425 can limit the rotation amplitude of the first stirring member 43. The limiting ring 426 is used to assist the rotation of the first stirring member 43 and limit the first elastic member 427. When the first stirring element 43 rotates, the first elastic element 427 is compressed. When the stirring process is completed, the first elastic element 427 resets and adjusts the first stirring element 43. The first elastic element 427 provides a certain support force for the first stirring element 43 during low-viscosity stirring to prevent it from rotating directly. As the carbonylation reaction time increases, its internal viscosity increases, and the first elastic element 427 is gradually compressed. The adjusting protrusion 428 is used to assist in adjusting the position of the scraper assembly 44 when the first stirring element 43 rotates, to prevent the scraper assembly 44 from being unable to scrape off the material adhering to the inner wall of the tank 11 due to the rotation of the first stirring element 43. The rotation of the first stirring element 43, combined with the adjustment of the adjusting protrusion 428, is sufficient to complete the scraping work of the scraper assembly 44 on the side of the tank 11. The first elastic element 427 can be set as an arc spring, or any other structure that can achieve the same effect.

[0026] In this embodiment, the scraper assembly 44 includes a scraper 441 slidably connected to the inside of the first stirring member 43 at one end. Abutment members 442 are fixedly connected to one side of the scraper 441 inside the first stirring member 43. A sliding block 443 is fixedly connected to the middle of one side of the scraper 441 inside the first stirring member 43. A second elastic member 444 is fixedly connected to the side of the sliding block 443 near the scraper 441.

[0027] Specifically, such as Figure 19As shown, the scraper 441 is used to scrape off the material adhering to the side wall of the tank 11. The abutment 442 is used to abut against the arc-shaped end face of the adjusting protrusion 428 when the first stirring member 43 rotates. As the abutment 442 slides on the arc-shaped end face, it drives the scraper 441 to slide to adjust its position and maintain the distance between it and the inner wall of the tank 11. While the scraper 441 moves, it drives the sliding block 443 to slide and compress the second elastic member 444. The sliding block 443 is used to limit the scraper 441 to prevent it from moving excessively and detaching from the first stirring member 43. The sliding block 443 has a snap-fit ​​groove on both sides about the snap-fit ​​member 435 to cooperate with the snap-fit ​​member 435 to snap and connect to the scraper 441 in the initial state. The second elastic member 444 can be set as a spring after the stirring process is completed and the first stirring member 43 is reset. The second elastic member 444 can be set as any other structure that can achieve the same effect.

[0028] In this embodiment, the first stirring member 43 includes several sets of adjusting blocks 431 disposed inside the first adjusting groove 424, the adjusting blocks 431 being opened through the annular adjusting hole 432 with respect to the limiting ring 426, several sets of second adjusting grooves 433 disposed inside the first stirring member 43 with respect to the adjusting protrusion 428, and a third adjusting groove 434 disposed inside the scraper assembly 44, and fasteners 435 symmetrically disposed with respect to the scraper assembly 44 are fixedly connected inside the first stirring member 43.

[0029] Specifically, such as Figures 9-18 As shown, the adjusting block 431 is an annular shape with a notch on one side, and can rotate inside the first adjusting groove 424 when the first stirring member 43 rotates. The adjusting hole 432 is opened inside the adjusting block 431, and both ends pass through the adjusting block 431 respectively. It is used to cooperate with the limiting ring 426 to improve the stability of the first stirring member 43 when it rotates. The third adjusting groove 434 is used for the sliding block 443 to slide and adjust. The second adjusting groove 422 is used for the adjusting protrusion 428 to adjust when the first stirring member 43 rotates. The second elastic member 444 is located inside the third adjusting groove 434. Several sets of abutting members 442 are provided about the adjusting protrusion 428. The end of the abutting member 442 away from the scraper member 441 is connected to the outer side of the abutting member 442. The latching member 435 is symmetrically arranged about the sliding block 443. The latching member 435 can be set as an elastic telescopic rod to cooperate with the top dome latching block to latch the sliding block 443. The latching groove provided on the outer side of the sliding block 443 is adapted to the shape of the dome latching block.

[0030] Working principle: The raw materials required for the carbonylation reaction to prepare carboxylic esters are added into the reaction mechanism 1. During processing, the driving component 2 drives the stirring shaft 41 to rotate. As the stirring shaft 41 rotates, the fixed frame 42 drives the first stirring component 43 to rotate. At the same time, the stirring shaft 41 drives the second stirring component 45 and the third stirring component 46 to rotate synchronously. During the carbonylation reaction, the material is initially in a low viscosity state. The large-sized blades of the first stirring component 43 push the material in the whole reactor to form an overall circulation. The spiral setting of the auxiliary stirring part provides axial circulation capability for the material, thereby improving the overall processing effect of the material. At the same time, the toothed protrusions on the outer side of the third stirring component 46 and the second stirring component 45 break the air bubbles during rotation to increase the gas-liquid contact area, thereby improving the gas-liquid mixing effect and further improving the carbonylation reaction efficiency. As processing time increases, larger carboxylic acid ester products with larger molecular weights are gradually generated and accumulated inside the material. The intermolecular forces of the system are enhanced, and the viscosity will gradually increase with the increase of product concentration. At this time, the resistance of the first stirring element 43 increases accordingly. The resistance drives the first stirring element 43 to rotate around the fixed shaft 423. The adjusting block 431 rotates inside the first adjusting groove 424, while compressing the first elastic element 427 and limiting the rotation amplitude of the first stirring element 43 by the limiting block 425. As the first stirring element 43 rotates, the resistance decreases, thereby reducing the equipment energy consumption caused by the increase in viscosity during the carbonylation reaction. Meanwhile, the scraper assembly 44 on the first stirring element 43 can automatically adjust its position as the first stirring element 43 rotates. By abutting the adjusting protrusion 428 through the contact element 442, the scraper 441 is moved to keep it always in contact with the inner wall of the tank 11. As it rotates, it scrapes off the adhering material, avoiding the accumulation of material that affects the heat exchange efficiency of the outer coil 3 and ensuring the stability of the reaction temperature. When the material inside the tank 11 has completed the carbonylation reaction, the prepared carboxylic acid ester can be taken out for subsequent processing.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency stirring mechanical device specifically for carbonylation reactions, comprising a reaction mechanism and a coil disposed outside the reaction mechanism, characterized in that: The reaction mechanism is internally equipped with a stirring mechanism for stirring during the carbonylation reaction. The stirring mechanism includes a stirring shaft and a fixed frame fixedly connected to the bottom of the stirring shaft. First stirring elements are symmetrically arranged on both sides of the fixed frame. The fixed frame includes a fixed part connected to the stirring shaft and fixed shafts fixedly connected to both sides of the fixed part. Several sets of auxiliary adjustment parts are provided on the outside of the fixed shafts. As the viscosity increases during the carbonylation reaction, the first stirring element is rotated by resistance and the rotation amplitude of the first stirring element is limited. An auxiliary stirring part arranged in a spiral is fixedly connected to the outside of the fixed frame to improve the axial circulation capability of the processed material. The auxiliary stirring part is provided with toothed protrusions on the outside to break up air bubbles and increase the gas-liquid contact area as the fixed frame rotates.

2. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 1, characterized in that: The stirring mechanism also includes a scraper assembly disposed on the side of the first stirring member near the inner wall of the reaction mechanism, a second stirring member fixedly connected to the upper end of the stirring shaft, used to improve the stirring effect on the upper material, and an auxiliary stirring part including a third stirring member whose two ends are fixedly connected to both sides of the fixed frame.

3. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 2, characterized in that: The fixed frame also includes several sets of adjusting protrusions on the outside of the fixed shaft. The fixed part includes a first fixing member fixedly connected to the upper end of the fixed shaft and a second fixing member fixedly connected to the lower end of the fixed shaft. The auxiliary adjusting part includes several sets of first adjusting grooves opened on the outside of the fixed shaft. Several sets of limiting blocks protrude on the outside of the fixed shaft. Limiting rings are fixedly connected inside the limiting blocks. First elastic members are fixedly connected inside the limiting blocks.

4. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 3, characterized in that: The ends of the first and second fixing members away from the fixed shaft are rotatably connected to the stirring shaft. The first adjusting groove is used to assist the first stirring member in rotation adjustment. The limiting block is used to limit the rotation amplitude of the first stirring member. The limiting ring is used to assist the first stirring member in rotation. The first elastic member is used to compress and reset as the first stirring member rotates. The adjusting protrusion is used to assist the scraper assembly in position adjustment.

5. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 4, characterized in that: The first stirring component includes several sets of adjusting blocks arranged inside the first adjusting groove, and annular adjusting holes through the limiting ring in the adjusting blocks. The first stirring component also includes several sets of second adjusting grooves arranged inside the adjusting protrusions and a third adjusting groove arranged inside the scraper assembly. The first stirring component is fixedly connected with fasteners symmetrically arranged around the scraper assembly.

6. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 5, characterized in that: The scraper assembly includes a scraper component with one end slidably connected inside the first stirring component. A symmetrically arranged abutting component is fixedly connected to one side of the scraper component inside the first stirring component. A symmetrically arranged sliding block is fixedly connected to the middle of one side of the scraper component inside the first stirring component. A symmetrically arranged second elastic component is fixedly connected to the side of the sliding block near the scraper component.

7. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 5, characterized in that: The third adjustment groove is used for sliding adjustment of the sliding block. The second elastic element is located inside the third adjustment groove. Several sets of abutting elements are arranged around the adjustment protrusion. The end of the abutting element away from the scraper element is connected to the outer side of the abutting element. The fasteners are symmetrically arranged around the sliding block.

8. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 2, characterized in that: The second stirring component includes several sets of stirring blades arranged around the circumference of the stirring shaft. The stirring blades are inclined about the stirring shaft, and the upper side of the stirring blades has a uniformly distributed first toothed edge. The third stirring component includes a second toothed edge on the upper side.

9. The high-efficiency stirring mechanical device for carbonylation reaction according to claim 2, characterized in that: The reaction mechanism includes a tank and an end cap fixedly connected to the upper end of the tank. A drive component for driving the stirring mechanism to rotate is fixedly connected to the upper end of the end cap, and a coil is fixedly connected to the outside of the tank.

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