Fermentation equipment for preparing methyl propionate and use method of fermentation equipment
By designing a fermentation equipment for preparation of methyl propionate including a fermentation reaction device and an auxiliary heating device, the problem of difficulty in uniform control of the reaction temperature in the prior art is solved, and the efficient preparation of methyl propionate is achieved, the yield and purity are improved, and the pollution is reduced.
Patent Information
- Application Number
- CN202411709255.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-02-28
AI Technical Summary
In the prior art, it is difficult to evenly control the reaction temperature of reactants in various places in the reactor, resulting in too high or too low reaction temperature, increasing the possibility of side reactions, reducing the yield and purity of methyl propionate, prolonging the reaction time, and reducing production efficiency.
A fermentation equipment for preparation of methyl propionate including a fermentation reaction device and an auxiliary heating device is designed. The resistive wire spiral tube wrapped around the outside of the reactor is heated by an electric heater, and a plurality of heating tubes and stirring plates are used to rotate at a constant speed in the tank body to achieve uniform heating and stirring of the solution in the reactor.
The uniform heating of reactants in the reactor is achieved, side reactions caused by excessive or low temperatures and problems of prolonging reaction time are avoided, the preparation yield, preparation purity and preparation efficiency of methyl propionate are improved, and the pollution to the atmospheric environment is reduced.
Smart Images
Figure CN119529977A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of methyl propionate preparation, in particular to fermentation equipment for preparing methyl propionate and a method for using the same. Background Art
[0002] Methyl propionate is an organic substance that can be used as a solvent for nitrocellulose, nitro paint, coatings, varnishes, etc. It can also be used as a solvent for spices and condiments. In organic synthesis, it can be used as an organic synthesis intermediate for the synthesis of other compounds. Methyl propionate is flammable, and its vapor can form an explosive mixture with air with an explosion limit of 2.5% to 13% (volume). Operators should wear self-priming filter-type gas masks (half masks), chemical safety glasses, anti-static work clothes, rubber oil-resistant gloves, etc. for protection. Methyl propionate can be prepared by the esterification reaction of propionic acid and methanol. A catalyst is usually required in this process. During the preparation process, a certain amount of propionic acid and methanol need to be added to the reactor. In the presence of a catalyst, the esterification reaction is heated to reflux. After the reaction is completed, the product is distilled and rectified to obtain pure methyl propionate.
[0003] In the prior art, when a certain amount of propionic acid and methanol are added to a reactor and heated under the action of a catalyst for an esterification reaction, it is difficult to uniformly control the reaction temperature of the reactants at various locations in the reactor. If the reaction temperature is too high, side reactions may be accelerated, reducing the yield and purity of methyl propionate. If the temperature is too low, the reaction rate will be too slow, extending the reaction time and reducing production efficiency, thereby being detrimental to the preparation yield, purity and efficiency of methyl propionate.
[0004] Therefore, we propose a fermentation device for preparing methyl propionate in order to solve the above-mentioned problems. Summary of the Invention
[0005] The object of the present invention is to provide a fermentation device for preparing methyl propionate, so as to solve the problem that it is difficult to accurately control the temperature of the reactants in the reactor in the prior art proposed in the above background art. If the reaction temperature is too high, the occurrence of side reactions may be accelerated, and the yield and purity of methyl propionate may be reduced. If the temperature is too low, the reaction rate will be too slow, the reaction time will be prolonged, and the production efficiency will be reduced, which is not conducive to the preparation of methyl propionate.
[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fermentation device for preparing methyl propionate, comprising a fermentation reaction device, the fermentation reaction device comprising a support frame, a tank body, an outer shell, an electric heater 1 and a discharge pipe, a resistance wire spiral tube is provided inside the outer shell, and the bottom end of the outer shell is fixedly installed with the top end of the electric heater 1, an auxiliary heating device is installed at the top end of the fermentation reaction device, the auxiliary heating device comprises a sealing cover, a motor, a fan and a heating assembly, the bottom ends of the sealing cover are fixedly installed with the top end of the tank body, and the top end of the sealing cover is fixedly installed with the bottom end of the motor, the heating assembly comprises an electric heater 2, a movable ring, a connecting ring, A rotating rod, a connecting tube and an assembly rod, the top of the movable ring is rotatably installed with the bottom end of the sealing cover, and the bottom of the movable ring is rotatably installed with the top of the tank body, the top of the assembly rod is fixedly connected to the bottom of the rotating rod, and the two ends of the bottom of the assembly rod are fixedly connected to the inner side of the movable ring, the output end of the motor is fixedly connected to the top of the rotating rod, the outer wall of the connecting ring is fixedly connected to the inner side of the movable ring, one end of the connecting tube is fixedly connected to the top of the connecting ring, and the other end of the connecting tube is fixedly connected to one end of the electric heater 2, the bottom annular array of the connecting ring is fixedly connected to a plurality of heating tubes, and the bottoms of the plurality of heating tubes are fixedly connected to a stirring plate.
[0007] Preferably, one end of the second electric heater is fixedly mounted on the outer side of the movable ring, the top of the sealing cover is fixedly connected to a square tube, and the bottom of the square tube is fixedly connected to a plurality of vertical tubes.
[0008] Preferably, the bottom ends of the plurality of vertical pipes are fixedly connected to an air intake pipe through a sealing cover, and a plurality of air intake holes are evenly opened on the outer side of the air intake pipe.
[0009] Preferably, one end of the fan is fixedly connected to one end of the square tube, and the other end of the fan is fixedly communicated with one end of the air guide tube.
[0010] Preferably, one end of the top of the sealing cover is fixedly connected to a first feeding pipe, and the other end of the top of the sealing cover is fixedly connected to a second feeding pipe.
[0011] Preferably, the top end of the support frame is fixedly mounted to the outer wall of the tank body, and the bottom end of the support frame is fixedly mounted to the outer wall of the shell.
[0012] Preferably, an insulating shell is fixedly connected to the inner side of the outer shell, and an outer side of the insulating shell is fixedly connected to the outer wall of the tank body.
[0013] Preferably, one end of the discharge pipe is fixedly connected to the bottom of the tank body, and the other end of the discharge pipe is fixedly connected to a discharge valve, one end of the bottom of the tank body is fixedly connected to a temperature detection rod, and the bottom end of the temperature detection rod is fixedly connected to a temperature detector.
[0014] A method for using a fermentation device for preparing methyl propionate, comprising the following steps: S1. Add a certain amount of propionic acid and methanol into the tank through feeding pipe 1, and then add a certain amount of catalyst into the tank through feeding pipe 2; S2, turning on electric heater 1, electric heater 2 and the motor, electric heater 1 heats the resistance wire spiral tube inside the shell, and the resistance wire spiral tube heats the solution in the tank through the insulating shell; S3, the second electric heater can heat multiple heating tubes through the connecting tube and the connecting ring. At the same time, the motor drives the rotating rod and the movable ring to rotate, so that the multiple heating tubes and the stirring plate rotate at a uniform speed, stirring the solution in the tank and assisting in uniform heating; S4. During the fermentation reaction, the temperature detector can detect the temperature of the reaction solution in the tank in real time through the end of the temperature detection rod, and the operator can adjust the temperature according to the temperature requirements; S5. During the fermentation reaction, the fan is turned on to suck the waste gas generated during the reaction through the suction pipe, the vertical pipe, the square pipe and the air guide pipe and introduce it into the collection device for treatment; S6. Under the action of the catalyst, the tank body is heated, fermented and esterified. After the reaction is completed, the discharge valve is opened, the product is discharged through the discharge pipe and distilled and rectified to obtain methyl propionate.
[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the electric heater and the auxiliary heating device are combined to heat the reactor tank body by heating the resistance wire spiral tube wrapped around the insulating shell outside the reactor tank body by the electric heater. At the same time, multiple heating tubes and stirring plates rotate at a constant speed in the tank body, thereby achieving the effect of stirring and assisting uniform heating of the solution in the tank body. The reactants in the tank body can be uniformly heated, and the reaction temperature of the reactants at various locations in the reactor can be uniformly controlled, thereby avoiding problems such as accelerated side reactions and prolonged reaction time caused by excessively high or low temperatures, thereby improving the preparation yield, preparation purity and preparation efficiency of methyl propionate. 2. In the present invention, during the fermentation reaction, the fan is turned on, and the exhaust gas generated during the reaction is sucked in by the fan through the suction pipe, the vertical pipe, the square pipe and the air guide pipe and introduced into the collection equipment for treatment, so as to prevent the exhaust gas generated during the reaction from being discharged to the outside, thereby reducing the pollution to the atmospheric environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a perspective view of a fermentation device for preparing methyl propionate according to the present invention; Figure 2 This is a rear perspective view of a fermentation device for preparing methyl propionate according to the present invention; Figure 3 This is a front structural perspective view of a fermentation device for preparing methyl propionate according to the present invention; Figure 4 This is a structural perspective diagram of a tank body of a fermentation device for preparing methyl propionate according to the present invention; Figure 5 This is a schematic structural diagram of an auxiliary heating device for fermentation equipment for preparing methyl propionate according to the present invention; Figure 6 This is a schematic diagram of the bottom structure of a sealing cover of a fermentation device for preparing methyl propionate according to the present invention; Figure 7 This is a front schematic diagram of an auxiliary heating device for fermentation equipment for preparing methyl propionate according to the present invention; Figure 8 The present invention provides a schematic structural diagram of a heating tube and a stirring plate for fermentation equipment for preparing methyl propionate.
[0017] In the picture: 1. Fermentation reaction device; 2. Auxiliary heating device; 10. Temperature detection rod; 11. Support frame; 12. Tank body; 13. Outer shell; 14. Electric heater 1; 15. Temperature detector; 16. Discharge pipe; 17. Discharge valve; 18. Resistance wire spiral tube; 19. Insulation shell; 21. Sealing cover; 22. Motor; 23. Square tube; 24. Fan; 25. Air guide tube; 26. Feeding pipe 1; 27. Heating component; 28. Feeding pipe 2; 29. Vertical pipe; 210. Intake pipe; 211. Intake hole; 271. Electric heater 2; 272. Movable ring; 273. Connecting ring; 274. Heating tube; 275. Stirring plate; 276. Rotating rod; 277. Connecting pipe; 278. Assembly rod. DETAILED DESCRIPTION
[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.
[0019] Example 1: Reference Figure 1 - Figure 8As shown: A fermentation device for preparing methyl propionate, comprising a fermentation reaction device 1, the fermentation reaction device 1 comprises a support frame 11, a tank body 12, a shell 13, an electric heater 14 and a discharge pipe 16, a resistance wire spiral tube 18 is provided inside the shell 13, and the bottom end of the shell 13 is fixedly installed with the top of the electric heater 14, an auxiliary heating device 2 is installed on the top of the fermentation reaction device 1, and the auxiliary heating device 2 comprises a sealing cover 21, a motor 22, a fan 24 and a heating component 27, the bottom ends of the sealing cover 21 are fixedly installed with the top of the tank body 12, and the sealing cover 21 is fixedly installed with the top end of the tank body 12. The top of the sealing cover 21 is fixedly mounted to the bottom of the motor 22. The heating assembly 27 includes an electric heater 271, a movable ring 272, a connecting ring 273, a rotating rod 276, a connecting pipe 277 and an assembly rod 278. The top of the movable ring 272 is rotatably mounted to the bottom of the sealing cover 21, and the bottom of the movable ring 272 is rotatably mounted to the top of the tank body 12. The top of the assembly rod 278 is fixedly connected to the bottom of the rotating rod 276, and the two ends of the bottom of the assembly rod 278 are fixedly connected to the inner side of the movable ring 272. The output end of the motor 22 is fixedly connected to the top of the rotating rod 276. The outer wall of the connecting ring 273 is fixedly connected to the inner side of the movable ring 272, one end of the connecting pipe 277 is fixedly connected to the top of the connecting ring 273, and the other end of the connecting pipe 277 is fixedly connected to one end of the electric heater 271. The bottom annular array of the connecting ring 273 is fixedly connected to multiple heating pipes 274, and the bottoms of the multiple heating pipes 274 are fixedly connected to the stirring plate 275. One end of the electric heater 271 is fixedly installed to the outer side of the movable ring 272, and one end of the top of the sealing cover 21 is fixedly connected to the feeding pipe 1 26, and the sealing cover 21 is fixedly connected to the feeding pipe 1. The other end of the top is fixedly connected to a feeding pipe 28, the top of the support frame 11 is fixedly installed on the outer wall of the tank body 12, and the bottom end of the support frame 11 is fixedly installed on the outer wall of the outer shell 13, the inner side of the outer shell 13 is fixedly connected to an insulating shell 19, and the outer side of the insulating shell 19 is fixedly connected to the outer wall of the tank body 12, one end of the discharge pipe 16 is fixedly connected to the bottom of the tank body 12, and the other end of the discharge pipe 16 is fixedly connected to a discharge valve 17, one end of the bottom of the tank body 12 is fixedly connected to a temperature detection rod 10, and the bottom end of the temperature detection rod 10 is fixedly connected to a temperature detector 15.
[0020] The working principle of this embodiment is as follows: the device combines an electric heater 14 and an auxiliary heating device 2. The electric heater 14 heats the resistance wire spiral tube 18 wrapped around the insulating shell 19 on the outer side of the reactor tank body 12 to heat the reactor tank body 12. At the same time, multiple heating tubes 274 and stirring plates 275 rotate at a constant speed in the tank body 12, thereby achieving the effect of stirring and assisting uniform heating of the solution in the tank body 12. The reactants in the tank body 12 can be uniformly heated, and the reaction temperature of the reactants at various locations in the reactor can be uniformly controlled to avoid problems such as accelerated side reactions and prolonged reaction time caused by excessively high or low temperatures, thereby improving the preparation yield, preparation purity and preparation efficiency of methyl propionate.
[0021] Example 2: Reference Figure 1 - Figure 8 The figure shows a fermentation device for preparing methyl propionate. A square tube 23 is fixedly connected to the top of a sealing cover 21. A plurality of vertical tubes 29 are fixedly connected to the bottom of the square tube 23. The bottom ends of the plurality of vertical tubes 29 pass through the sealing cover 21 and are fixedly connected to an air intake pipe 210. A plurality of air intake holes 211 are evenly formed on the outside of the air intake pipe 210. One end of a fan 24 is fixedly connected to one end of the square tube 23, and the other end of the fan 24 is fixedly connected to one end of an air guide pipe 25. A method for using a fermentation device for preparing methyl propionate, comprising the following steps: S1. Add a certain amount of propionic acid and methanol into the tank 12 through the feeding pipe 1 26, and then add a certain amount of catalyst into the tank 12 through the feeding pipe 2 28; S2. Turn on the electric heater 14, the electric heater 271 and the motor 22. The electric heater 14 heats the resistance wire spiral tube 18 inside the housing 13. The resistance wire spiral tube 18 heats the solution in the tank 12 through the insulating shell 19. S3. The second electric heater 271 can heat the multiple heating tubes 274 through the connecting tube 277 and the connecting ring 273. At the same time, the motor 22 drives the rotating rod 276 and the movable ring 272 to rotate, thereby causing the multiple heating tubes 274 and the stirring plate 275 to rotate at a uniform speed, stirring and assisting in uniform heating of the solution in the tank body 12; S4. During the fermentation reaction, the temperature detector 15 can detect the temperature of the reaction solution in the tank 12 in real time through the end of the temperature detection rod 10, and the operator adjusts the temperature according to the temperature requirements; S5. During the fermentation reaction, the fan 24 is turned on. The fan 24 sucks the waste gas generated during the reaction through the suction pipe 210, the vertical pipe 29, the square pipe 23 and the air guide pipe 25 and introduces it into the collection device for treatment; S6. Under the action of the catalyst, the tank body 12 is heated for fermentation and esterification reaction. After the reaction is completed, the discharge valve 17 is opened, and the product is discharged through the discharge pipe 16 and distilled and rectified to obtain methyl propionate.
[0022] The working principle of this embodiment is as follows: During the fermentation reaction, the fan 24 is turned on, and the exhaust gas generated during the reaction is sucked in by the fan 24 through the intake pipe 210, the vertical pipe 29, the square tube 23 and the air guide pipe 25 and introduced into the collection device for treatment, so as to prevent the exhaust gas generated during the reaction from being discharged to the outside, thereby reducing pollution to the atmospheric environment.
[0023] In the present invention, when using propionic acid and methanol to prepare methyl propionate, a certain amount of propionic acid and methanol are first added to the tank body 12 through the first feeding pipe 26, and then a certain amount of catalyst is added to the tank body 12 through the second feeding pipe 28; the first electric heater 14, the second electric heater 271, and the motor 22 are turned on, and the first electric heater 14 heats the resistance wire spiral tube 18 inside the housing 13, and the resistance wire spiral tube 18 heats the solution in the tank body 12 through the insulating shell 19 (the first electric heater 14 heats the resistance wire spiral tube 18 wound on the insulating shell 19 outside the reactor tank body 12, thereby heating the reactor tank body 12. The electric heating equipment is lightweight, easy to adjust the temperature, and does not require facilities such as pumps, furnaces, and chimneys, making it convenient to use). Similarly, the connecting tube 277, the connecting ring 273 and the plurality of heating tubes 274 are all provided with interconnected resistance wires, and the electric heater 271 can heat the plurality of heating tubes 274 through the connecting tube 277 and the connecting ring 273. At the same time, the motor 22 drives the rotating rod 276 and the movable ring 272 to rotate, so that the plurality of heating tubes 274 and the stirring plate 275 rotate at a uniform speed, and the plurality of stirring plates 275 assist in uniform heating while stirring the solution in the tank body 12; under the action of the catalyst, the tank body 12 is heated for fermentation and esterification reaction. After the reaction is completed, the discharge valve 17 is opened, and the product is discharged through the discharge pipe 16 and distilled and rectified to obtain methyl propionate. Ester; The device is combined with an electric heater 14 and an auxiliary heating device 2. The electric heater 14 heats the resistance wire spiral tube 18 wrapped around the insulating shell 19 outside the reactor tank body 12 to heat the reactor tank body 12. At the same time, multiple heating tubes 274 and stirring plates 275 rotate at a constant speed in the tank body 12, thereby achieving the effect of stirring and assisting uniform heating of the solution in the tank body 12. The reactants in the tank body 12 can be uniformly heated, and the reaction temperature of the reactants at various locations in the reactor can be uniformly controlled to avoid problems such as accelerated side reactions and prolonged reaction time caused by excessively high or low temperatures, thereby improving the preparation yield, preparation purity and preparation efficiency of methyl propionate; At the same time, during the fermentation reaction process, the temperature detector 15 can detect the temperature of the reaction solution in the tank body 12 in real time through the end of the temperature detection rod 10, and the operator can adjust it according to the temperature requirements; during the fermentation reaction process, the fan 24 is turned on, and the fan 24 sucks in the exhaust gas generated during the reaction through the intake pipe 210, the vertical pipe 29, the square tube 23 and the air guide pipe 25 and introduces it into the collection equipment for treatment, so as to avoid the exhaust gas generated during the reaction from being discharged to the outside, so as to reduce the pollution to the atmospheric environment.
[0024] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A fermentation device for preparing methyl propionate, comprising a fermentation reaction device (1), wherein the fermentation reaction device (1) comprises a support frame (11), a tank body (12), a shell (13), an electric heater (14) and a discharge pipe (16), characterized in that: A resistance wire spiral tube (18) is arranged inside the shell (13), and the bottom end of the shell (13) is fixedly mounted to the top end of the electric heater (14). An auxiliary heating device (2) is installed at the top end of the fermentation reaction device (1). The auxiliary heating device (2) includes a sealing cover (21), a motor (22), a fan (24) and a heating component (27). The bottom ends of the sealing cover (21) are fixedly mounted to the top end of the tank body (12), and the top end of the sealing cover (21) is fixedly mounted to the bottom end of the motor (22). The heating component (27) includes an electric heater (271), a movable ring (272), a connecting ring (273), a rotating rod (276), a connecting pipe (277) and an assembly rod (278). The top end of the movable ring (272) is rotatably mounted to the bottom end of the sealing cover (21). , and the bottom of the movable ring (272) is rotatably mounted on the top of the tank body (12), the top of the assembly rod (278) is fixedly connected to the bottom of the rotating rod (276), and the two ends of the bottom of the assembly rod (278) are fixedly connected to the inner side of the movable ring (272), the output end of the motor (22) is fixedly connected to the top of the rotating rod (276), the outer wall of the connecting ring (273) is fixedly connected to the inner side of the movable ring (272), one end of the connecting pipe (277) is fixedly connected to the top of the connecting ring (273), and the other end of the connecting pipe (277) is fixedly connected to one end of the second electric heater (271), and a plurality of heating tubes (274) are fixedly connected to the bottom of the connecting ring (273) in an annular array, and a stirring plate (275) is fixedly connected to the bottom of the plurality of heating tubes (274).
2. The fermentation equipment for preparing methyl propionate according to claim 1, characterized in that: One end of the second electric heater (271) is fixedly mounted on the outer side of the movable ring (272); the top of the sealing cover (21) is fixedly connected to a square tube (23); and the bottom of the square tube (23) is fixedly connected to a plurality of vertical tubes (29).
3. The fermentation equipment for preparing methyl propionate according to claim 2, characterized in that: The bottom ends of the plurality of vertical pipes (29) pass through the sealing cover (21) and are fixedly connected to an air intake pipe (210), and a plurality of air intake holes (211) are evenly arranged on the outside of the air intake pipe (210).
4. The fermentation equipment for preparing methyl propionate according to claim 1, characterized in that: One end of the fan (24) is fixedly connected to one end of the square tube (23), and the other end of the fan (24) is fixedly connected to one end of the air guide tube (25).
5. The fermentation equipment for preparing methyl propionate according to claim 1, characterized in that: One end of the top of the sealing cover (21) is fixedly connected to a feeding pipe 1 (26), and the other end of the top of the sealing cover (21) is fixedly connected to a feeding pipe 2 (28).
6. The fermentation equipment for preparing methyl propionate according to claim 1, characterized in that: The top end of the support frame (11) is fixedly mounted on the outer wall of the tank body (12), and the bottom end of the support frame (11) is fixedly mounted on the outer wall of the outer shell (13).
7. The fermentation equipment for preparing methyl propionate according to claim 1, characterized in that: An insulating shell (19) is fixedly connected to the inner side of the outer shell (13), and an outer side of the insulating shell (19) is fixedly connected to the outer wall of the tank body (12).
8. The fermentation equipment for preparing methyl propionate according to claim 1, characterized in that: One end of the discharge pipe (16) is fixedly connected to the bottom of the tank body (12), and the other end of the discharge pipe (16) is fixedly connected to a discharge valve (17); one end of the bottom of the tank body (12) is fixedly connected to a temperature detection rod (10), and the bottom end of the temperature detection rod (10) is fixedly connected to a temperature detector (15).
9. A method for using a fermentation device for preparing methyl propionate, characterized in that: The fermentation equipment for preparing methyl propionate according to any one of claims 1 to 8 is used, comprising the following steps: S1. Add a certain amount of propionic acid and methanol into the tank (12) through the first feeding pipe (26), and then add a certain amount of catalyst into the tank (12) through the second feeding pipe (28); S2, turning on the electric heater 1 (14), the electric heater 2 (271) and the motor (22), the electric heater 1 (14) heats the resistance wire spiral tube (18) inside the housing (13), and the resistance wire spiral tube (18) heats the solution in the tank body (12) through the insulating shell (19); S3, the second electric heater (271) can heat the plurality of heating tubes (274) through the connecting tube (277) and the connecting ring (273), and at the same time, the motor (22) drives the rotating rod (276) and the movable ring (272) to rotate, thereby causing the plurality of heating tubes (274) and the stirring plate (275) to rotate at a uniform speed, thereby stirring and assisting in uniform heating of the solution in the tank body (12); S4. During the fermentation reaction, the temperature detector (15) can detect the temperature of the reaction solution in the tank (12) in real time through the end of the temperature detection rod (10), and the operator can adjust the temperature according to the temperature requirement; S5. During the fermentation reaction, the fan (24) is turned on. The fan (24) sucks the waste gas generated during the reaction through the suction pipe (210), the vertical pipe (29), the square pipe (23) and the air guide pipe (25) and introduces the waste gas into the collection device for treatment; S6. Under the action of the catalyst, the tank body (12) is heated for fermentation and esterification reaction. After the reaction is completed, the discharge valve (17) is opened, and the product is discharged through the discharge pipe (16) and distilled and rectified to obtain methyl propionate.