Oxidation kettle and method for preparing isocaprylic acid intermediate product sodium isocaprylate by using oxidation kettle

Abstract

The invention discloses an oxidation kettle and a method for preparing an isocaprylic acid intermediate product sodium isocaprylate, the oxidation kettle comprises a kettle body and a jacket fixedly sleeved outside the circular outer part and the bottom end of the kettle body, a sealing seat is arranged at the center of the top end of the kettle body, a speed reducer is fixed at the top end of the sealing seat through a flange and a screw, and a speed reduction shaft of the speed reducer penetrates through the sealing seat; a speed reducer is arranged in the kettle body, the top end of the speed reducer is in transmission connection with a stirring motor, the stirring motor is electrically connected with an external power supply through an electric wire, and a stirring shaft is vertically arranged at the center of the kettle body. According to the device, the stirring effect on fluid in the kettle body can be enhanced through automatic up-down swinging of the metal stirring rollers, synchronous swinging of the multiple stirring rollers is achieved through the linkage mechanism, stable and controllable swinging action is ensured through the driving mechanism, the mixing uniformity and reaction efficiency of materials in the oxidation kettle are remarkably improved, and the production cost is reduced. And the stirring requirements of high-viscosity and easily-layered materials are met. The oxidation kettle can be used for preparing an isocaprylic acid intermediate product sodium isocaprylate.

Description

Technical Field

[0001] This invention relates to the technical field of chemical equipment, specifically to an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid. Background Technology

[0002] This oxidation reactor is a core piece of equipment in the production process of isooctanoic acid and sodium isooctanoate. It is mainly used in key reaction steps such as isooctanoic acid synthesis and refining. In the production of isooctanoic acid, the oxidation reactor is required to complete the oxidation reaction of raw materials (such as 2-ethylhexanol, oxygen, etc.) and subsequent processes such as neutralization, dehydration, and pretreatment before distillation. The internal stirring effect and the uniformity of material mixing directly affect the reaction conversion rate, product purity and production efficiency of isooctanoic acid. The oxidation reactor currently used for isooctanoic acid production usually uses the reactor body as the reaction vessel, with an external jacket for temperature control. The internal stirring shaft and fixed stirring rod are set up. The stirring rod is driven by a stirring motor to rotate, so as to achieve mixing and reaction promotion of materials in the reactor. At the same time, it integrates manholes, external connectors and other components to meet the needs of feeding, sampling, temperature measurement and other operations. However, in practical applications, the existing oxidation reactors for isooctanoic acid production have problems restricting production efficiency and product quality in terms of stirring reaction due to the characteristics of isooctanoic acid (the viscosity of the material gradually increases during the reaction, and local agglomeration and stratification are easy to occur) and the limitations of traditional stirring structures. Specifically, the existing oxidation reactors mentioned above have large stirring blind zones and uneven material mixing. For example, most existing oxidation reactors use stirring rods with fixed angles, which can only achieve stirring along the circumference of the stirring axis. For oxidation reactors with a large longitudinal height, the material flow and exchange between the upper and lower areas are insufficient, easily forming stirring blind zones. In the sodium isooctanoate oxidation reaction, the raw materials need to be in full contact with the catalyst, but the fixed stirring rod is difficult to drive the high-viscosity materials to achieve three-dimensional circulation, resulting in excessively high raw material concentration in local areas and incomplete reaction. This not only reduces the conversion rate of sodium isooctanoate but also easily generates by-products, affecting product purity. Summary of the Invention

[0003] The purpose of this invention is to provide an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid, to solve the problems mentioned in the background art. These problems include the fact that existing oxidation reactors mostly use fixed-angle stirring rods, which only perform circumferential stirring. When the reactor body is vertically high, the material exchange between the upper and lower parts is insufficient and there are blind spots. In the isooctanoic acid oxidation reaction, it is difficult to drive the three-dimensional circulation of highly viscous materials, resulting in uneven contact of raw materials, incomplete reaction, reduced conversion rate, and the generation of by-products, which affects the purity.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an oxidation reactor, comprising a reactor body and a jacket fitted and fixed to the outer circular and bottom ends of the reactor body, a sealing seat being provided at the center of the top end of the reactor body, a speed reducer being fixed to the top end of the sealing seat by a flange and screws, and the speed reducer's reduction shaft passing through the sealing seat, a stirring motor being drivenly connected to the top end of the speed reducer, and the stirring motor being electrically connected to an external power source via wires, a stirring shaft being vertically arranged at the center of the reactor body, and the top end of the stirring shaft being connected to the bottom end of the speed reducer's reduction shaft via a coupling, and a self-oscillating efficiency-enhancing stirring device being provided on the stirring shaft.

[0005] The oxidation vessel is a reaction vessel used for oxidation reactions.

[0006] In one embodiment, the self-oscillating enhanced stirring device includes a stirring roller fixing sleeve, a self-oscillating stirring mechanism, a self-oscillating linkage mechanism, and a self-oscillating drive mechanism. Multiple stirring roller fixing sleeves are equidistantly sleeved at the center of the stirring shaft and its lower outer side. Self-oscillating stirring mechanisms are provided at both ends of the multiple stirring roller fixing sleeves. The self-oscillating stirring mechanisms at the right end of the multiple stirring roller fixing sleeves and at the left end are respectively connected by a self-oscillating linkage mechanism. The top ends of two self-oscillating linkage mechanisms are connected by a self-oscillating drive mechanism.

[0007] In one embodiment, the self-oscillating enhanced stirring device further includes a metal fixing ring and a fixing bracket. The top of the self-oscillating drive mechanism is fixed with a metal fixing ring, and multiple fixing brackets are welded at equal intervals to the circular outer wall of the metal fixing ring. The ends of the multiple fixing brackets away from the outer wall of the metal fixing ring are all fixedly connected to the inner wall by welding.

[0008] In one embodiment, the self-oscillating stirring mechanism at the right end of the stirring roller fixing sleeve includes a metal stirring roller, a connecting rotating block, a metal connecting shaft, and a U-shaped connecting rotating groove. The outer wall of the right end of each of the multiple stirring roller fixing sleeves is welded with a connecting rotating block. There are multiple metal stirring rollers, equal in number to the number of stirring roller fixing sleeves. The left end of each of the multiple metal stirring rollers is provided with a U-shaped connecting rotating groove. The multiple U-shaped connecting rotating grooves are respectively fitted onto the front and rear ends and the right end of the connecting rotating block corresponding to their positions. The metal stirring rollers and the corresponding connecting rotating blocks are rotatably connected by a metal connecting shaft. The metal stirring rollers can rotate up and down through the metal connecting shaft.

[0009] In one embodiment, the self-oscillating stirring mechanism further includes a wave-shaped oscillating groove and turbulence holes. The upper and lower ends of the plurality of metal stirring rollers are provided with wave-shaped oscillating grooves, and the front end of the top and the rear end of the plurality of wave-shaped oscillating grooves are all treated with bevels. The wave-shaped oscillating grooves can generate vertical turbulence with the fluid being stirred through their own wave grooves and bevels at the corners, and cause the metal stirring rollers to rotate vertically through the metal connecting shaft. The center of the plurality of metal stirring rollers is provided with a plurality of turbulence holes, and the turbulence holes penetrate the metal stirring rollers from front to back.

[0010] In one embodiment, the self-oscillating linkage mechanism includes an up-and-down oscillation travel groove, a metal anti-slip rod, a long strip linkage rod, and a U-shaped connecting slot. Each of the multiple metal stirring rollers has a U-shaped connecting slot inside its right end, with the U-shaped opening facing right. Both ends of the U-shaped connecting slot have horizontally penetrating up-and-down oscillation travel grooves. A long strip linkage rod is vertically inserted into the center of each of the multiple U-shaped connecting slots. Multiple sets of metal anti-slip rods are welded to both ends of each of the multiple long strip linkage rods. Each set of metal anti-slip rods is inserted into the up-and-down oscillation travel groove at the corresponding position of the U-shaped connecting slot. When the long strip linkage rod moves up and down, it can drive the metal stirring rollers to rotate and oscillate up and down through the metal anti-slip rods inserted in the up-and-down oscillation travel grooves. When the metal stirring rollers rotate and oscillate up and down, the metal anti-slip rods slide within the up-and-down oscillation travel grooves to provide the up-and-down oscillation travel range for the metal stirring rollers.

[0011] In one embodiment, the self-oscillating drive mechanism includes a welded fixing plate, a horizontal limiting bracket, an arc-shaped drive ramp, and a ramp fixing ring. A welded sleeve is sleeved and fixed to the outside of the stirring shaft near the top end. The welded sleeve is located below the coupling. Horizontally arranged horizontal limiting brackets are welded to both the left and right ends of the welded sleeve. A rectangular movable hole is provided inside the center of the horizontal limiting bracket at the right end of the welded sleeve, and a welded fixing plate is provided at the right end of the horizontal limiting bracket. The welded fixing plate is fixed to the inner wall of the vessel by welding. The top end of the elongated linkage rod passes through the rectangular movable hole and can move up and down in the rectangular movable hole. A ramp fixing ring is welded to the outer wall of the bottom end of the metal fixing ring. Multiple arc-shaped drive ramps are equidistantly arranged on the outer wall of the bottom end of the ramp fixing ring, and the arc-shaped drive ramps are arranged in a downward arc-shaped arch.

[0012] In one embodiment, the self-oscillating drive mechanism further includes a U-shaped wheel sleeve, an oscillating stabilizing motion roller, and a roller shaft. The top of the elongated linkage rod is welded with a U-shaped wheel sleeve, and the U-shaped opening of the U-shaped wheel sleeve faces upward. The oscillating stabilizing motion roller is provided inside the U-shaped wheel sleeve, and the oscillating stabilizing motion roller is rotatably connected to the U-shaped wheel sleeve through the roller shaft. The top of the oscillating stabilizing motion roller is in contact with the arc-shaped outer wall of the bottom end of the arc-shaped drive ramp or the outer wall of the bottom end of the ramp fixing ring, and the oscillating stabilizing motion roller can roll along the outer wall of the bottom end of the arc-shaped drive ramp or the ramp fixing ring.

[0013] In one embodiment, the self-oscillating drive mechanism further includes a self-oscillating pressure spring and a spring stop. A spring stop is welded to the outside of the bottom end of the U-shaped wheel sleeve, and a self-oscillating pressure spring is disposed between the bottom end of the spring stop and the top end of the horizontal limiting bracket. The self-oscillating pressure spring is sleeved on the outside of the elongated linkage rod. In one embodiment, when the top of the oscillating stabilizing motion roller is in contact with the outer wall of the bottom end of the slope block fixing ring, the self-oscillating pressure spring is in a one-third compression state. As the oscillating stabilizing motion roller rolls from the outer wall of the bottom end of the slope block fixing ring toward the outer wall of the arc-shaped driving slope block, it pushes the elongated linkage rod downward and further compresses the self-oscillating pressure spring downward through the blocking action of the spring baffle. During the downward movement of the elongated linkage rod, it pushes multiple metal stirring rollers downward through the metal anti-slip rod inserted in the upper and lower swing stroke groove, so that the right ends of the multiple metal stirring rollers rotate downward. During the upward movement of the elongated linkage rod, it pulls multiple metal stirring rollers upward through the metal anti-slip rod inserted in the upper and lower swing stroke groove, so that the multiple metal stirring rollers rotate upward and reset and continue to rotate upward.

[0014] In one embodiment, when the swinging stabilizing motion roller rolls a full circle on the outer wall of the bottom end of the arc-shaped driving ramp and the ramp fixing ring, the long strip linkage rod will drive the right end of multiple metal stirring rollers connected to it to swing up and down, and the multiple metal stirring rollers swing up and down at the same angle.

[0015] In one embodiment, a metal coil is provided inside the circular interior of the vessel body. The metal coil is spirally arranged from bottom to top inside the vessel body. The metal coil is close to the circular inner wall of the vessel body but does not contact the circular inner wall of the vessel body. The left and right ends of the metal coil are respectively provided with a coil inlet and a coil outlet. The coil inlet and coil outlet are at the same height and respectively penetrate through the left and right ends of the vessel body near the top. The left end of the coil inlet and the right end of the coil outlet are exposed outside the outer wall of the left and right ends of the vessel body, respectively.

[0016] In one embodiment, a manhole and multiple external connectors are arranged in a circular angle on the outer side of the center of the top of the vessel body. The manhole is sealed with a sealing end cap by a sealing cap and is connected to the inside of the jacket. The multiple external connectors are a pressing port, a high-pressure water inlet, a vent port, a nitrogen inlet, a safety valve port, a pressure gauge port, an octanol inlet, a vent port, a temperature measuring port, and an exhaust port. The bottom end of the pressing port is connected to a pressing pipe, and the bottom end of the pressing pipe extends to fit the inner wall of the center of the bottom of the vessel body. The pressing port can convey the reactants inside the vessel body upward through the pressing pipe.

[0017] In one embodiment, multiple support brackets are welded at equal intervals to the top circular outer wall of the vessel body, and the support brackets can be fixedly connected to the support pillars by screws. The support brackets are located above the jacket.

[0018] In one embodiment, a heat transfer oil inlet and a steam outlet are provided on both sides of the center of the bottom end of the jacket. A heat transfer oil outlet and a steam inlet are provided near the top left end of the jacket, and an exhaust port is provided near the top right end of the jacket. The heat transfer oil inlet and steam outlet, the heat transfer oil outlet and steam inlet, and the exhaust port are all connected to the interior of the area between the jacket and the vessel body.

[0019] A method for preparing sodium isooctanoate in an oxidation reactor includes the following steps: First, add the full amount of sodium hydroxide and zinc oxide from the formula. Isooctol is pumped from the raw material tank area into the isooctol metering tank via a centrifugal pump. The isooctol is then added to the oxidation reactor. After the feeding is complete, the system is sealed. The reactor is pressure tested with nitrogen to replace the oxygen. Once the pressure is qualified, the hot oil system is turned on to raise the temperature. When the reactor temperature reaches 160℃, stirring is started. The reaction temperature is controlled at 255±5℃, and the reaction pressure is controlled at 2.5MPa. The generated hydrogen gas is discharged into the atmosphere through a condenser, a two-stage cyclone separator, and a three-stage spray. When no more hydrogen gas is released from the reaction, the pressure is maintained for 40 minutes. Then, the pressure inside the reactor is released to atmospheric pressure. Tap water from the formula is added to the oxidation reactor through a high-pressure water tank. The mixture is stirred for 40 minutes to ensure that the oxidation product is evenly dissolved in the water. Stirring is stopped, and the oxidation product is pressurized into the sodium salt storage tank with nitrogen to obtain sodium isooctanoate. The reactor is then dried for the next batch.

[0020] Furthermore, isooctanoic acid is obtained by acidification of sodium isooctanoate.

[0021] Compared with the prior art, the present invention provides an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid, which has the following beneficial effects: This invention designs a novel self-oscillating enhanced stirring device on the stirring shaft of an oxidation reactor. This device can enhance the stirring effect on the fluid inside the reactor by autonomously oscillating the metal stirring rollers. At the same time, it uses a linkage mechanism to realize the synchronous oscillation of multiple stirring rollers and a drive mechanism to ensure that the oscillation action is stable and controllable, which significantly improves the mixing uniformity and reaction efficiency of materials in the oxidation reactor and is suitable for the stirring needs of high viscosity and easily stratified materials. 1. This invention adds a self-oscillating stirring mechanism to the stirring shaft. The main body of this mechanism is a metal stirring roller. When the stirring shaft drives the metal stirring rollers on both sides to stir the fluid inside the vessel through the stirring roller fixing sleeve, the metal stirring roller will oscillate up and down through the wave-shaped oscillating grooves at the top and bottom ends during the stirring process. The oscillation up and down increases the stirring effect. The wave-shaped oscillating grooves at the top and bottom ends of the metal stirring roller adopt a wave groove design, and the front end of the top and the rear end of the bottom are treated with bevels. When rotating with the stirring shaft, the wave-shaped oscillating grooves come into contact with the fluid and generate differential reaction forces. The raised part of the groove is pushed upward by the fluid, and the beveled part is resisted downward by the fluid, forming a force difference in the vertical direction, which pushes the metal stirring roller to rotate automatically up and down around the metal connecting shaft. At the same time, multiple turbulence holes at the center of the metal stirring roller allow some fluid to flow through, reducing stirring resistance and enhancing local turbulence. Combined with the up and down oscillation action, it expands the stirring coverage area and avoids the stirring blind spots that exist in traditional fixed stirring rods. Especially for high viscosity fluids, it can effectively break up material agglomeration and improve the mixing uniformity. 2. To enable multiple metal stirring rollers in the same vertical column to swing synchronously up and down, a novel self-swinging linkage mechanism is added to the rollers. This mechanism drives the rollers to swing synchronously up and down. The mechanism uses a long, strip-shaped linkage rod that passes through a U-shaped connecting slot on the right end of each roller. A linkage constraint is formed by the cooperation of a metal anti-slip rod and a vertical swing stroke groove. When the long, strip-shaped linkage rod moves up and down, the anti-slip rod slides within the vertical swing stroke groove, causing the rollers to rotate synchronously. This ensures that all rollers in the same column swing at the same angle and move in a coordinated manner. The length of the vertical swing stroke groove provides a stable limit to the swing stroke of the rollers, preventing excessive swing amplitude from causing structural interference or insufficient amplitude from affecting the mixing effect. Simultaneously, the insertion structure of the U-shaped connecting slot and the long, strip-shaped linkage rod adapts to changes in the rotation angle of the rollers, ensuring linkage stability and solving the problem of mixing disorder that easily occurs when multiple mixing components operate independently. 3. To enable the stirring shaft to actively drive multiple metal stirring rollers to swing up and down via a self-oscillating linkage mechanism during rotation, a new self-oscillating drive mechanism is added to the existing self-oscillating linkage mechanism. When the stirring shaft rotates, the self-oscillating drive mechanism actively drives the self-oscillating linkage mechanism, which in turn actively drives multiple metal stirring rollers in the same vertical column to swing up and down. The self-oscillating drive mechanism drives the slope fixing ring and the arc-shaped drive slope block to rotate via the stirring shaft. When the oscillating stabilizing roller rolls along the arc-shaped outer wall of the arc-shaped drive slope block, the slope thrust compresses the self-oscillating pressure spring downwards, pushing the long strip linkage rod downwards, thus driving the metal rollers to swing up and down. The right end of the stirring roller swings downwards; when the roller rolls to the bottom of the slope block fixing ring, the self-oscillating pressure spring resets and pushes the long strip linkage rod upwards, causing the right end of the metal stirring roller to swing upwards and reset, forming a periodic up-and-down oscillation; the horizontal limiting bracket and the rectangular movable hole constrain the movement direction of the long strip linkage rod, ensuring that it only moves in the vertical direction and avoiding lateral deviation that affects the linkage effect; this design, which is directly driven by the rotation of the stirring shaft, can realize the active oscillation of the metal stirring roller without an additional power source, reducing energy consumption while ensuring that the oscillation frequency matches the stirring speed, making the stirring action more coordinated, and further improving the material mixing efficiency and reaction uniformity. Attached Figure Description

[0022] Figure 1 This is a front cross-sectional three-dimensional structural diagram of an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid, according to the present invention.

[0023] Figure 2 This is a front view of the external three-dimensional structure of an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid, according to the present invention.

[0024] Figure 3 This is a front view of the external planar structure of an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid, according to the present invention.

[0025] Figure 4 This is a front view of the internal planar structure of an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid, according to the present invention.

[0026] Figure 5 This is a schematic diagram of the overall three-dimensional structure of the self-oscillating enhanced stirring device of the present invention.

[0027] Figure 6 This is a schematic diagram of the overall planar structure of the self-oscillating enhanced stirring device of the present invention.

[0028] Figure 7 This is a front-view three-dimensional structural diagram of the self-oscillating stirring mechanism of the present invention.

[0029] Figure 8 This is a front-view three-dimensional structural diagram of the self-oscillating linkage mechanism of the present invention.

[0030] Figure 9 This is a schematic diagram of the overall three-dimensional structure of the self-oscillating drive mechanism of the present invention.

[0031] Figure 10 This is a partial three-dimensional structural diagram of the self-oscillating drive mechanism of the present invention.

[0032] In the diagram: 1. Jacket; 2. Vessel body; 3. Support bracket; 4. Sealing end cap; 5. Manhole; 6. Sealing seat; 7. Reducer; 8. Stirring motor; 9. External connector; 10. Stirring shaft; 11. Metal coil; 12. Self-oscillating efficiency-enhancing stirring device; 13. Pressurizing pipe; 14. Heat transfer oil inlet and steam outlet; 15. Heat transfer oil outlet and steam inlet; 16. Coil inlet; 17. Coil outlet; 18. Exhaust port; 19. Stirring roller fixing sleeve; 20. Self-oscillating stirring mechanism; 21. Self-oscillating linkage mechanism; 22. Self-oscillating drive mechanism; 23. Metal... 24. Fixed ring; 25. Fixed bracket; 26. Metal stirring roller; 27. Wave-shaped swing groove; 28. Connecting rotating block; 29. ​​Metal connecting shaft; 30. U-shaped connecting groove; 31. Turbulence hole; 32. Up and down swing stroke slide groove; 33. Metal anti-slip rod; 34. Long strip linkage rod; 35. U-shaped connecting slot; 36. Welded fixing plate; 37. Horizontal limiting bracket; 38. Arc-shaped drive ramp; 39. Ramp block fixing ring; 40. Self-swinging pressure spring; 41. U-shaped wheel sleeve; 42. Swinging stabilizing motion roller; 43. Roller shaft; 44. Spring baffle. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides, for example Figure 1-10The diagram illustrates an oxidation reactor and a method for preparing sodium isooctanoate, an intermediate product of isooctanoic acid. The reactor uses a reactor body 2 as the core reaction vessel, with a jacket 1 fixed externally via a sleeve connection. The jacket 1 covers the circular outer wall and bottom outer wall of the reactor body 2, forming a sealed heat exchange chamber for regulating the internal reaction temperature of the reactor body 2 using a heat transfer medium (heat transfer oil or steam). A sealing seat 6 is fixed at the center of the top of the reactor body 2, and the sealing seat 6 is connected to a reducer 7 via a flange and screws to ensure a tight seal between the reducer 7 and the reactor body 2, preventing material leakage or the entry of external impurities during the reaction. A stirring motor 8 is driven from the top of the reducer 7, and a reduction shaft at the bottom passes through the sealing seat 6 and is connected to the top of a stirring shaft 10 vertically positioned at the center of the reactor body 2 via a coupling. This allows the power of the stirring motor 8 to be transmitted to the stirring shaft 10 after reduction, driving the stirring shaft 10 to rotate stably. The reactor body 2 also integrates multiple auxiliary structures, with metal discs spirally arranged from bottom to top near the circular inner wall of the reactor body 2. The metal coil 11 does not contact the inner wall of the vessel body 2, avoiding direct heat transfer between the coil and the vessel body 2 and affecting the temperature control accuracy. The coil inlet 16 and coil outlet 17 at both ends pass through the top left and right ends of the vessel body 2 and are exposed, allowing cooling or heating media to be introduced. Together with the jacket 1, they form a dual internal and external temperature control function to improve the temperature uniformity inside the vessel. The outer side of the top center of the vessel body 2 is distributed with manhole 5 and multiple external connectors 9 (pressurization port, high-pressure water inlet, vent port, etc.) along a circular angle. The manhole 5 is sealed by the sealing end cap 4, facilitating personnel to enter the vessel for maintenance. The external connectors 9 respectively realize the functions of material conveying, pressure regulation, and safety protection. The pressurization pipe 13 connected to the pressurization port extends to the inner wall of the bottom center of the vessel body 2 to ensure that the material can be completely discharged after the reaction. Multiple support brackets 3 are welded to the circular outer wall of the vessel body 2 near the top for fixing the support pillars, realizing the overall stable support of the oxidation vessel. The support brackets 3 are located above the jacket 1 and do not affect the heat exchange function of the jacket 1.

[0035] like Figure 1 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, the self-oscillating enhanced stirring device 12 is mounted on the stirring shaft 10. Its core includes stirring roller fixing sleeve 19, self-oscillating stirring mechanism 20, self-oscillating linkage mechanism 21, and self-oscillating drive mechanism 22. Multiple stirring roller fixing sleeves 19 are equidistantly sleeved and fixed at the center and lower outer wall of the stirring shaft 10, which serve as the mounting base for the self-oscillating stirring mechanism 20. Each stirring roller fixing sleeve 19 is equipped with a set of self-oscillating stirring mechanism 20 at both ends. Multiple sets of self-oscillating stirring mechanisms 20 on the same side (left or right end) are connected by the self-oscillating linkage mechanism 21 to ensure synchronous operation. The top ends of the two self-oscillating linkage mechanisms 21 are connected to the self-oscillating drive mechanism 22, which provides active oscillation power, forming a complete transmission chain of driving, linkage, and stirring. In addition, a metal fixing ring 23 is fixed at the top end of the self-oscillating drive mechanism 22. The metal fixing ring 23 is welded and fixed to the inner wall of the vessel body 2 through multiple fixing brackets 24 to ensure that the self-oscillating drive mechanism 22 remains fixed during the rotation of the stirring shaft 10, providing a stable reference for the oscillation drive. Furthermore, in the above-mentioned self-oscillating stirring mechanism 20, the metal stirring roller 25 is the core stirring component. A U-shaped connecting groove 29 is provided inside its left end. This U-shaped connecting groove 29 is sleeved on the front and rear ends and the right side exterior of the connecting rotating block 27 welded to the right end of the stirring roller fixing sleeve 19, and is rotatably connected via a metal connecting shaft 28. This U-shaped sleeve structure ensures a stable connection between the metal stirring roller 25 and the connecting rotating block 27, and also provides the metal stirring roller 25 with vertical rotational freedom, allowing it to oscillate vertically around the metal connecting shaft 28 by 30 degrees. The metal stirring roller 25 also has wave-shaped oscillation grooves 26 machined at both ends. The front end of the top and the rear end of the bottom of the wave-shaped oscillation grooves 26 are beveled. Their function is that when the stirring shaft 10 drives the metal stirring roller 25 to rotate, the wave-shaped oscillation grooves 26 come into contact with the fluid inside the vessel, and the protruding parts of the wave grooves are subjected to [unclear - possibly a specific action or process]. The upward reaction force of the fluid, while the inclined section is resisted by the downward force of the fluid, creates a force difference in the vertical direction, which drives the metal stirring roller 25 to automatically swing around the metal connecting shaft 28. At the same time, multiple turbulence holes 30 are set through the center of the metal stirring roller 25, which allows some fluid to flow through during the stirring process. On the one hand, this reduces the fluid resistance when the metal stirring roller 25 rotates and reduces the energy consumption of the stirring motor 8. On the other hand, it forms local turbulence, breaks up material agglomeration, and can significantly improve the uniformity of stirring, especially for high viscosity materials. It avoids the stirring blind zone that exists in traditional fixed stirring rods. The inclined design of the wave-shaped swing groove 26 mentioned above effectively avoids the shearing damage of the fluid by the sharp corners and protects the characteristics of easily degradable materials. The coordination of the turbulence holes 30 and the swinging action expands the stirring coverage from rotating circular stirring to a three-dimensional area of ​​combined rotation and swinging stirring, thereby improving the mixing efficiency of materials in the vessel. Furthermore, the self-oscillating linkage mechanism 21 includes a long strip linkage rod 33, a U-shaped connecting slot 34, a vertical oscillation stroke groove 31, and a metal anti-slip rod 32. Each metal stirring roller 25 has a U-shaped connecting slot 34 with its U-shaped opening facing right inside its right end. The vertical oscillation stroke groove 31 extends horizontally through both ends of the U-shaped connecting slot 34. All metal stirring rollers 25 on the same side are connected in series via a long strip linkage rod 33. The long strip linkage rod 33 is vertically inserted into the center of each U-shaped connecting slot 34, and multiple sets of metal anti-slip rods 32 welded to its front and rear ends are respectively inserted into the corresponding vertical oscillation stroke grooves 31. When the long strip linkage rod 33 moves up and down, the metal anti-slip rods 32 slide within the vertical oscillation stroke grooves 31. Through the limiting effect of the grooves on the rods, the metal stirring rollers 25 are driven to oscillate up and down synchronously around the metal connecting shaft 28. Conversely, when a single metal stirring roller 25 moves down, the vertical oscillation stroke groove 32 slides within the vertical oscillation stroke groove 31. When the mixing roller 25 swings due to the fluid force difference, it can also push the long strip linkage rod 33 through the metal anti-slip rod 32, which will drive other metal mixing rollers 25 on the same side to move synchronously. The length design of the vertical swing stroke groove 31 provides a stable swing stroke limit for the metal mixing roller 25, avoiding excessive swing amplitude that may cause interference between adjacent mixing components, or too small swing amplitude that may affect the mixing effect. The opening structure of the U-shaped connecting slot 34 is adapted to the swing angle change of the metal mixing roller 25, ensuring that the long strip linkage rod 33 and the metal mixing roller 25 always maintain stable transmission without jamming. Through the above-mentioned self-swing linkage mechanism 21, a dual mixing effect combining synchronous swing and coordinated mixing can be achieved, which solves the problem of mixing disorder that is easy to be caused by the independent action of traditional multiple mixing components. Especially for scenarios with a large longitudinal height of the vessel body 2, it can ensure that the mixing intensity of materials in the upper and lower areas is consistent and improve the overall mixing uniformity. Furthermore, to enable the stirring shaft 10 to actively drive multiple metal stirring rollers 25 to swing up and down via the self-oscillating linkage mechanism 21 during rotation, a new self-oscillating drive mechanism 22 is added to the self-oscillating linkage mechanism 21. When the stirring shaft 10 rotates, the self-oscillating drive mechanism 22 actively drives the self-oscillating linkage mechanism 21, which in turn actively drives multiple metal stirring rollers 25 in the same vertical column to swing up and down. The self-oscillating drive mechanism 22 includes a welding sleeve, a horizontal limiting bracket 36, a ramp fixing ring 38, an arc-shaped drive ramp 37, an oscillating stabilizing motion roller 41, and a self-oscillating pressure spring 39. The welding sleeve is sleeved and fixed to the outer wall of the stirring shaft 10 near the top (below the coupling). Horizontally set horizontal limiting brackets 36 are welded to the left and right ends of the welding sleeve. The right horizontal limiting bracket 36 has a rectangular movable hole in its center and is welded and fixed to the inner wall of the vessel body 2 by a welding fixing piece 35 to ensure the horizontal limiting bracket... Position 36 is fixed; the top of the long strip linkage rod 33 passes through a rectangular movable hole, and a U-shaped wheel sleeve 40 is welded to the top. Inside the U-shaped wheel sleeve 40, a swing stabilizing motion roller 41 is assembled through a roller shaft 42. The fixed end of the self-swinging drive mechanism 22 is connected to the inner wall of the vessel body 2 through a metal fixing ring 23. A slope block fixing ring 38 is welded to the bottom end of the metal fixing ring 23. Multiple arc-shaped drive slope blocks 37 (arc-shaped drive slope blocks 37 arch downwards) are evenly distributed on the outer wall of the bottom end of the slope block fixing ring 38. The top of the swing stabilizing motion roller 41 is attached to the outer wall of the bottom end of the slope block fixing ring 38 or the outer wall of the bottom end of the arc-shaped drive slope block 37, and can roll along its surface; a spring baffle 43 is welded to the bottom end of the U-shaped wheel sleeve 40. A self-swinging pressure spring 39 is sleeved between the spring baffle 43 and the top of the horizontal limiting bracket 36. When the swing stabilizing motion roller 41 is attached to the slope block fixing ring 38, the self-swinging pressure spring 39 is in a one-third compression state, storing the initial elastic potential energy; Furthermore, when the stirring shaft 10 rotates, it drives the welding sleeve and the horizontal limiting bracket 36 to rotate synchronously, which in turn drives the U-shaped wheel sleeve 40 and the swinging stabilizing motion roller 41 to rotate around the center of the stirring shaft 10. When the swinging stabilizing motion roller 41 rolls to the arc-shaped drive ramp 37, the inclined surface of the arc-shaped drive ramp 37 will generate a downward thrust on the roller, pushing the U-shaped wheel sleeve 40 and the long strip linkage rod 33 to move downward. The spring baffle 43 compresses the self-swinging pressure spring 39, and the long strip linkage rod 33 drives the right end of the metal stirring roller 25 to swing downward through the metal anti-slip rod 32. When the roller rolls to the ramp fixing ring 38 between the adjacent arc-shaped drive ramps 37, the self-swinging pressure spring 39 releases its elastic potential energy, pushing the spring baffle 43 and the U-shaped wheel sleeve 40 to reset upward, driving the long strip linkage rod 33 to move upward, which in turn pulls the right end of the metal stirring roller 25 to swing upward. This cycle continues. This system ensures that for every revolution of the stirring shaft 10, the metal stirring roller 25 completes one up-and-down oscillation, with the oscillation frequency perfectly matching the rotational speed of the stirring shaft 10. The rectangular movable hole of the horizontal limiting bracket 36 constrains the movement direction of the elongated linkage rod 33, ensuring it moves only vertically and preventing lateral deviation that could lead to linkage failure. The pre-compression design of the self-oscillating pressure spring 39 ensures that the oscillating stable moving roller 41 always adheres to the slope fixing ring 38 or the arc-shaped drive slope 37, eliminating free rotation and guaranteeing continuous and stable oscillation. The entire driving process requires no additional power source, utilizing only the rotational power of the stirring shaft 10 itself, reducing equipment energy consumption. Furthermore, the oscillation frequency can be adjusted with the rotational speed of the stirring shaft 10 to adapt to the stirring needs of different reaction stages (e.g., high speed and high oscillation frequency in the early stages of the reaction to accelerate material mixing, and low speed and low oscillation frequency in the later stages to avoid excessive material shearing).

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, when putting the oxidation reactor into use, it is necessary to check the sealing status of each sealing part (sealing seat 6, manhole 5 sealing end cover 4, external connector 9 interface) to ensure there is no leakage; then check whether the inlet and outlet valves of jacket 1 and metal coil 11 are closed, and whether the metal stirring roller 25 of the self-oscillating enhanced stirring device 12 is flexible and without jamming; install a pressure gauge through the pressure gauge port and a temperature sensor through the temperature measuring port to ensure that the monitoring equipment is normal; then, according to the reaction requirements, introduce the heat transfer medium through the heat transfer oil inlet and steam inlet of jacket 1 (if heating is required, introduce...). Steam; if cooling is required, heat transfer oil is introduced. At the same time, auxiliary temperature control medium is introduced through the coil inlet 16 of the metal coil 11. The circulation system of the jacket 1 and the coil is started to adjust the temperature inside the vessel to the preset reaction temperature. Nitrogen is introduced into the vessel through the nitrogen inlet to replace the air inside the vessel and prevent oxygen in the air from affecting the reaction (for reactions that require an oxygen-free environment). When adding materials, the raw material inlet external connector 9 at the top of the vessel 2 must be opened (through manhole 5 or pressure port). The reaction raw materials are added into the vessel 2 in proportion. After the materials are added, the feed valve is closed to ensure that the vessel 2 is sealed. Furthermore, if stirring intervention is required for the reactants inside the vessel 2, the stirring motor 8 needs to be started. The motor power, after being reduced by the reducer 7, drives the stirring shaft 10 to rotate via the coupling. During the rotation of the stirring shaft 10, on the one hand, it drives the stirring roller fixing sleeve 19 and the metal stirring roller 25 to rotate around the center of the stirring shaft 10, performing circumferential stirring of the materials inside the vessel; on the other hand, the self-oscillating drive mechanism 22 drives the metal stirring roller 25 to oscillate up and down, achieving a compound stirring action combining circumferential rotation and up-and-down oscillation, accelerating material mixing. During the reaction, the temperature inside the vessel can be monitored through the temperature measuring port. If the temperature is higher than the preset value, the heat transfer oil outlet valve of the jacket 1 is adjusted to increase the cooling medium flow rate, or the inlet valve of the metal coil 11 is adjusted to introduce the cooling medium; if the temperature is lower than the preset value, the opening of the steam inlet valve is increased to raise the flow rate. The heat exchange temperature of jacket 1 is achieved through the heat transfer oil inlet and steam outlet 14 and the heat transfer oil outlet and steam inlet 15. The pressure inside the vessel is monitored by the pressure gauge. If the pressure is too high, the vent or exhaust port 18 is opened to release the pressure. If a high-pressure environment needs to be maintained, nitrogen is added through the nitrogen inlet to adjust the pressure to the preset range. If it is necessary to monitor the reaction material inside the vessel 2, the mixing state of the material inside the vessel can be observed through the sight glass at the top of the vessel 2 (a sight glass is preset inside the top of the vessel 2, or it can be temporarily observed through the manhole 5). If the material is found to be stratified or unevenly stirred, the speed of the stirring motor 8 can be appropriately increased to increase the rotation and oscillation frequency of the metal stirring roller 25 to improve the mixing effect. For materials that are easy to settle, the pressure pump can be started intermittently through the pressure port to transport the material at the bottom of the vessel 2 upward to avoid material sedimentation. Furthermore, after the material reaction reaches its endpoint through the sampling port (a sampling port is pre-set inside the top of the vessel 2, or a small amount of sample is taken through the pressure port), the stirring motor 8 is turned off to stop stirring, and the temperature control medium inlet valves of the jacket 1 and the metal coil 11 are closed to stop temperature control. If cooling is required, cooling medium can continue to be introduced. After the temperature inside the vessel drops to room temperature, the circulation system is closed, and then the outlet valve of the pressure port is opened to start the pressure pump. The material after reaction inside the vessel is sucked into the pressure port through the pressure pipe 13 and then transported to subsequent processing equipment (such as storage tanks and filters). During the material discharge process, the stirring motor 8 can be started intermittently to drive the metal stirring roller 25 to rotate and swing slightly to avoid material residue on the vessel wall or bottom and ensure that the material is completely discharged. After the material is discharged, the high-pressure water inlet is opened to introduce high-pressure water into the vessel, and the stirring motor 8 is started to drive the metal stirring roller 25 to rotate and swing, which will stimulate the inner wall of the vessel. Clean the stirring components. After cleaning, close the high-pressure water inlet, open the vent, and drain the residual moisture from the vessel. If drying is required, hot air can be introduced through the jacket 1 to dry the vessel. After cleaning, open the manhole 5 and the sealing end cover 4, and enter the vessel to check the components of the self-oscillating enhanced stirring device 12. Check whether there is any material residue blocking the wave-shaped oscillating groove 26 of the metal stirring roller 25, and whether the turbulence hole 30 is unobstructed. If there is any blockage, it needs to be cleaned. Check whether the metal connecting shaft 28, the long strip linkage rod 33, the metal anti-slip rod 32, and other components are worn. If the wear is severe, they need to be replaced. Check whether the elasticity of the self-oscillating pressure spring 39 is normal. If the elasticity is weakened, it needs to be replaced. If the oxidation vessel is idle for a long time, all external connectors 9 valves need to be closed, and the inside of the vessel body 2 needs to be dried to avoid corrosion of components caused by a humid environment. Nitrogen gas can be introduced periodically to replace the air inside the vessel and maintain a dry and oxygen-free environment inside the vessel.

[0037] A method for preparing sodium isooctanoate in an oxidation reactor includes the following steps: First, add the full amount of sodium hydroxide and zinc oxide from the formula. Isooctol is pumped from the raw material tank area into the isooctol metering tank via a centrifugal pump. The isooctol is then added to the oxidation reactor. After the feeding is complete, the system is sealed. The reactor is pressure tested with nitrogen to replace the oxygen. Once the pressure is qualified, the hot oil system is turned on to raise the temperature. When the reactor temperature reaches 160℃, stirring is started. The reaction temperature is controlled at 255±5℃, and the reaction pressure is controlled at 2.5MPa. The generated hydrogen gas is discharged into the atmosphere through a condenser, a two-stage cyclone separator, and a three-stage spray. When no more hydrogen gas is released from the reaction, the pressure is maintained for 40 minutes. Then, the pressure inside the reactor is released to atmospheric pressure. Tap water from the formula is added to the oxidation reactor through a high-pressure water tank. The mixture is stirred for 40 minutes to ensure that the oxidation product is evenly dissolved in the water. Stirring is stopped, and the oxidation product is pressurized into the sodium salt storage tank with nitrogen to obtain sodium isooctanoate. The reactor is then dried for the next batch.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oxidation kettle, comprising a kettle body (2) and a jacket (1) fixed to the circular outer part and the outer part of the bottom end of the kettle body (2), a sealing seat (6) is arranged at the center of the top end of the kettle body (2), a speed reducer (7) is fixed to the top end of the sealing seat (6) through a flange and screws, and the speed reduction shaft of the speed reducer (7) penetrates the sealing seat (6), a stirring motor (8) is drivingly connected to the top end of the speed reducer (7), a stirring shaft (10) is vertically arranged at the center of the kettle body (2), and the top end of the stirring shaft (10) is connected to the bottom end of the speed reduction shaft of the speed reducer (7) through a shaft coupling, characterized in that: The stirring shaft (10) is provided with a self-swinging efficiency increasing stirring device (12); The self-swinging efficiency increasing stirring device (12) comprises stirring roller fixing sleeves (19), self-swinging stirring mechanisms (20), self-swinging linkage mechanisms (21) and self-swinging driving mechanisms (22), a plurality of stirring roller fixing sleeves (19) are fixedly sleeved at the center and the lower outer part of the stirring shaft (10), the left and right ends of the stirring roller fixing sleeves (19) are provided with self-swinging stirring mechanisms (20), the self-swinging stirring mechanisms (20) at the right end of the stirring roller fixing sleeves (19) and the self-swinging stirring mechanisms (20) at the left end are respectively connected through self-swinging linkage mechanisms (21), and the top ends of the self-swinging linkage mechanisms (21) are connected through a self-swinging driving mechanism (22).

2. An oxidation kettle according to claim 1, characterized in that: The self-swinging efficiency increasing stirring device (12) further comprises metal fixing rings (23) and fixing supports (24), the top end of the self-swinging driving mechanism (22) is fixedly connected with a metal fixing ring (23), a plurality of fixing supports (24) are equidistantly welded on the outer wall of the metal fixing ring (23), and the ends of the fixing supports (24) away from the outer wall of the metal fixing ring (23) are fixedly connected with the inner wall of the kettle body (2) through welding.

3. An oxidation kettle according to claim 2, wherein: The self-swinging stirring mechanism (20) at the right end of the stirring roller fixing sleeve (19) comprises metal stirring rollers (25), connecting rotating blocks (27), metal connecting shafts (28) and U-shaped connecting rotating grooves (29), a connecting rotating block (27) is welded on the outer wall of the right end of each of the stirring roller fixing sleeves (19), a plurality of metal stirring rollers (25) are provided and equal in number to the stirring roller fixing sleeves (19), a U-shaped connecting rotating groove (29) is arranged in the left end of each of the metal stirring rollers (25), the U-shaped connecting rotating grooves (29) are respectively sleeved on the front and rear ends and the right end of the corresponding connecting rotating blocks (27), and the metal stirring rollers (25) are rotatably connected with the corresponding connecting rotating blocks (27) through the metal connecting shafts (28).

4. An oxidation kettle as claimed in claim 3, wherein: The top and bottom ends of the metal stirring rollers (25) are provided with wave-shaped swinging grooves (26), the top front end and the bottom rear end of the wave-shaped swinging grooves (26) are beveled, the wave-shaped swinging grooves (26) can generate up and down disturbance with the stirred fluid through the wave-shaped grooves and the bevels, and the metal stirring rollers (25) are rotated up and down through the metal connecting shafts (28), a plurality of disturbance holes (30) are arranged in the center of each of the metal stirring rollers (25), and the disturbance holes (30) penetrate the metal stirring rollers (25) front and rear.

5. An oxidation kettle according to claim 4, wherein: The self-swing linkage mechanism (21) comprises up-down swing stroke sliding grooves (31), metal anti-slip rods (32), long strip linkage rods (33) and U-shaped connection grooves (34), the right end of each of the plurality of metal stirring rollers (25) is internally provided with a U-shaped connection groove (34), the U-shaped opening direction of the U-shaped connection groove (34) faces right, the front and rear ends of the U-shaped connection groove (34) are transversely penetrated by the up-down swing stroke sliding grooves (31), the center of each of the plurality of U-shaped connection grooves (34) is vertically inserted and connected with the long strip linkage rod (33), the front and rear ends of each of the plurality of long strip linkage rods (33) are welded with a plurality of groups of metal anti-slip rods (32), and each group of metal anti-slip rods (32) is inserted into the up-down swing stroke sliding grooves (31) at the front and rear ends of the corresponding position U-shaped connection groove (34), when the long strip linkage rod (33) moves up and down, the metal anti-slip rod (32) inserted in the up-down swing stroke sliding groove (31) can drive the metal stirring roller (25) to rotate and swing up and down, and when the metal stirring roller (25) rotates and swings up and down, the metal anti-slip rod (32) slides in the up-down swing stroke sliding groove (31) to provide the up-down swing of the metal stirring roller (25) with a stroke.

6. An oxidation kettle according to claim 5, wherein: The self-swing driving mechanism (22) comprises welding fixing plates (35), horizontal limiting supports (36), arc-shaped driving slope blocks (37) and slope block fixing rings (38), the welding sleeve is fixedly sleeved on the outer part close to the top end of the stirring shaft (10), the welding sleeve is located below the shaft coupling, the left and right ends of the welding sleeve are welded with horizontally arranged horizontal limiting supports (36), the center of the horizontal limiting support (36) at the right end of the welding sleeve is internally provided with a rectangular movable hole, the right end of the horizontal limiting support (36) is provided with a welding fixing plate (35), and the welding fixing plate (35) is fixedly welded on the inner wall of the kettle body (2), the top end of the long strip linkage rod (33) penetrates through the rectangular movable hole and can move up and down in the rectangular movable hole, the bottom end of the metal fixing ring (23) is welded with a slope block fixing ring (38), a plurality of arc-shaped driving slope blocks (37) are equidistantly arranged on the bottom end outer wall of the slope block fixing ring (38), and the arc-shaped driving slope blocks (37) are arranged in a downward arc shape.

7. An oxidation kettle according to claim 6, wherein: The self-swing driving mechanism (22) further comprises a U-shaped wheel sleeve (40), a swing stable movement roller (41) and a roller rotating shaft (42), the top end of the long strip linkage rod (33) is welded with a U-shaped wheel sleeve (40), the U-shaped opening direction of the U-shaped wheel sleeve (40) faces upward, the U-shaped inner part of the U-shaped wheel sleeve (40) is provided with a swing stable movement roller (41), and the swing stable movement roller (41) is rotationally connected with the U-shaped wheel sleeve (40) through the roller rotating shaft (42), the top end of the swing stable movement roller (41) abuts against the bottom end arc-shaped outer wall of the arc-shaped driving slope block (37) or the bottom end outer wall of the slope block fixing ring (38), and the swing stable movement roller (41) can roll along the bottom end outer wall of the arc-shaped driving slope block (37) or the slope block fixing ring (38).

8. An oxidation kettle according to claim 7, wherein: The self-swing driving mechanism (22) further comprises a self-swing pressure spring (39) and a spring stopper (43), the bottom end of the U-shaped wheel sleeve (40) is welded with the spring stopper (43), the self-swing pressure spring (39) is arranged between the bottom end of the spring stopper (43) and the top end of the horizontal limiting support (36), and the self-swing pressure spring (39) is sleeved on the outside of the long strip linkage rod (33).

9. An oxidation kettle according to claim 8, wherein: When the top end of the swing stable movement roller (41) is attached to the bottom end outer wall of the slope block fixing ring (38), the self-swing pressure spring (39) is in a one-third compressed state, and in the rolling process of the swing stable movement roller (41) from the bottom end outer wall of the slope block fixing ring (38) to the outer wall of the arc-shaped driving slope block (37), the long strip linkage rod (33) is pushed downward, and the self-swing pressure spring (39) is further compressed downward by the blocking effect of the spring stopper (43), and in the downward movement of the long strip linkage rod (33), the plurality of metal stirring rollers (25) are pushed downward through the metal anti-slip rod (32) inserted in the up-down swing stroke sliding groove (31), so that the right end of the plurality of metal stirring rollers (25) is rotated downward, and in the upward movement of the long strip linkage rod (33), the plurality of metal stirring rollers (25) are pulled upward through the metal anti-slip rod (32) inserted in the up-down swing stroke sliding groove (31), so that the plurality of metal stirring rollers (25) are rotated upward and reset and continue to rotate upward, and in the rolling of the swing stable movement roller (41) on the arc-shaped driving slope block (37) and the bottom end outer wall of the slope block fixing ring (38) for one circumference, the long strip linkage rod (33) drives the right end of the plurality of metal stirring rollers (25) connected thereto to swing up and down, and the plurality of metal stirring rollers (25) swing up and down by the same angle.

10. A method for preparing sodium iso-octoate using the oxidation kettle according to any one of claims 1-9, characterized in that, The method comprises the following steps: First, add all the formula amount of sodium hydroxide and zinc oxide, and isooctanol is pumped into an isooctanol metering tank from a centrifugal pump in a raw material tank area, isooctanol is added to an oxidation kettle, after the feeding is completed, the system is closed, nitrogen is used to test and replace the oxygen in the oxidation kettle, after passing the test, the heat oil system is started to heat, when the kettle temperature rises to 160°C, the stirring is started, the reaction temperature is controlled at 255±5°C, the reaction pressure is controlled at 2.5 MPa, and the generated hydrogen is discharged into the atmosphere through a condenser, a secondary cyclone separator and a tertiary spray, when there is no hydrogen gas emission in the reaction, the pressure is maintained for 40 minutes, then the pressure in the kettle is released to normal pressure, the formula tap water is added to the oxidation kettle from a high-pressure water tank, and the stirring is performed for 40 minutes, so that the oxidation product is uniformly dissolved in water, the stirring is stopped, the oxidation product is pressed into a sodium salt storage tank by nitrogen, and sodium isooctanoate is obtained, and the kettle is dried for preparation for the next batch.

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