Energy-saving device for producing sodium methoxide

Abstract

The utility model provides an energy-saving device for producing sodium methoxide, which comprises a reaction tower, a rectifying tower and a recovery tower which are connected in sequence, tower kettles of the rectifying tower and the recovery tower are respectively provided with a rectifying tower reboiler and a recovery tower reboiler, and a reaction tower reboiler is arranged in a tower kettle of the reaction tower. The tower top of the rectifying tower is connected with a tower kettle of the reaction tower through a rectifying tower gas phase pipeline I, a compressor I is arranged on the rectifying tower gas phase pipeline I, the rectifying tower gas phase pipeline I is connected with a rectifying tower gas phase pipeline II, the rectifying tower gas phase pipeline II is connected with the recovery tower reboiler, and a compressor II and a compressor III are arranged on the rectifying tower gas phase pipeline II; the rectifying tower gas phase pipeline II is connected with a rectifying tower gas phase pipeline III, the rectifying tower gas phase pipeline III is connected with a rectifying tower reboiler, and a rectifying tower reboiler discharge pipeline and a recovery tower reboiler discharge pipeline are respectively connected with the middle upper part of the rectifying tower; the energy utilization efficiency can be greatly improved, the energy consumption can be reduced, and the product purity can be improved.

Description

Technical Field

[0001] This application relates to the technical field of sodium methoxide synthesis, and particularly relates to an energy-saving device for producing sodium methoxide. Background Art

[0002] Sodium methoxide is an important chemical product, mainly used as an intermediate raw material for the synthesis of pharmaceuticals and pesticides, and can also be used as a catalyst for the production of edible oil and biodiesel, as well as an analytical reagent, with good market prospects; at present, the main production methods of sodium methoxide in China are the alkali method and the metallic sodium method, both of which have achieved large-scale industrialization.

[0003] The metallic sodium method refers to the direct reaction of metallic sodium with alcohol to produce sodium alkoxide and hydrogen. This method has a simple process, but the production process is extremely unsafe, and the price of metallic sodium is expensive; the alkali method uses sodium hydroxide to react with methanol to produce sodium methoxide, and the reaction equation is: CH 3 OH + NaOH → CH 3 ONa + H 2 O.

[0004] Because the metallic sodium method has low safety and high cost, therefore, in large-scale continuous industrial production, the alkali method is mostly used to produce sodium methoxide in the reaction stripping tower, and the cost of the alkali method is relatively low; however, there are some technical and economic challenges in the production of sodium methoxide by the alkali method, as follows:

[0005] First of all, due to the reversibility of the reaction, it needs to be carried out at a relatively high temperature, which increases energy consumption; the alkalinity of sodium methoxide is stronger than that of sodium hydroxide, and the generated sodium methoxide is extremely easy to regenerate methanol and sodium hydroxide when encountering water. Therefore, in order to prevent the reversibility of the reaction, a relatively high temperature needs to be ensured during the reaction.

[0006] Secondly, a large amount of water is generated in the reaction, and additional energy is required to remove this water, further increasing the production cost; the content of free alkali in the sodium methoxide synthesized by the alkali method is higher than that of the metallic sodium method. Therefore, reducing the water content in the raw materials and reaction equipment and promptly removing the water generated in the reaction can make the reaction move in the direction of producing sodium methoxide to obtain a sodium methoxide product that meets the requirements.

[0007] The raw materials for obtaining sodium methoxide by the alkali method are easily available, the cost is low, and the operation safety is good. However, due to incomplete reaction, the product often contains sodium hydroxide impurities. Therefore, the sodium hydroxide in sodium methoxide should be controlled within a relatively low range.

[0008] In order to solve the above technical problems, the commonly used processes in the prior art are double-tower processes, or three-tower + two-heat pump process flows, such as a double heat pump energy-saving system for alkaline sodium methoxide with application number: 202322403305.4, which discloses a technical scheme including a reaction tower, a methanol distillation tower and a wastewater recovery tower, and also including a low-pressure heat pump, a high-pressure heat pump, a methanol distillation tower reboiler and a reflux cooler; the reaction tower is connected to the methanol distillation tower, and the methanol distillation tower is connected to the wastewater recovery tower; one side of the methanol distillation tower is connected to a first connector through a pipeline, and the beneficial effects of the utility model are as follows: The result is: on the basis of the original sodium methoxide process, the principle of split heat pump distillation is adopted, and the split point of the original sodium methoxide distillation tower is accurately determined by using simulation software such as Aspen and ProII and production experience. The wastewater recovery tower and a high-pressure heat pump after the added split point are used to fully utilize the latent heat of methanol vapor in the distillation tower to reduce the energy consumption of the entire device; this application utilizes part of the heat from the top of the methanol distillation tower. The heat from the top of the methanol distillation tower is used to heat the reaction tower and the reboiler of the methanol distillation tower respectively, and it is not fully utilized, and the purity of the product obtained by this device is low.

[0009] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0010] The present application provides an energy-saving device for producing sodium methoxide, comprising a reaction tower, a distillation tower, and a recovery tower connected in sequence, wherein the tower kettles of the distillation tower and the recovery tower are respectively provided with a distillation tower reboiler and a recovery tower reboiler, the tower kettle of the reaction tower is provided with a reaction tower reboiler, the tower top of the distillation tower is connected to the tower kettle of the reaction tower through a distillation tower gas phase pipeline 1, a compressor 1 is provided on the distillation tower gas phase pipeline 1, the distillation tower gas phase pipeline 1 is connected to a distillation tower gas phase pipeline 2, the distillation tower gas phase pipeline 2 is connected to the recovery tower reboiler, a compressor 2 and a compressor 3 are provided on the distillation tower gas phase pipeline 2, the distillation tower gas phase pipeline 2 between the compressor 2 and the compressor 3 is connected to the distillation tower gas phase pipeline 3, the distillation tower gas phase pipeline 3 is connected to the distillation tower reboiler, the distillation tower reboiler discharge pipeline is connected to the middle and upper part of the distillation tower, and the recovery tower reboiler discharge pipeline of the recovery tower reboiler is connected to the middle and upper part of the distillation tower.

[0011] As a preferred solution, a distillation tower reflux device is provided on the distillation tower reboiler discharge pipeline, and the distillation tower reflux device is also connected to the recovery tower reboiler discharge pipeline of the recovery tower reboiler.

[0012] As a preferred solution, the distillation tower reflux device comprises a distillation tower cooler, a distillation tower reflux tank, and a reflux pump which are connected in sequence.

[0013] As a preferred solution, a feed pipeline is provided on one side of the reaction tower, and a feed preheater is provided on the feed pipeline.

[0014] As a preferred solution, the recovery tower reboiler discharge pipeline is connected to the distillation tower reflux device through a feed preheater.

[0015] As a preferred solution, the top of the recovery tower is provided with a recovery tower gas phase pipeline 1 and a recovery tower gas phase pipeline 2, the recovery tower gas phase pipeline 1 is connected to the middle and lower part of the distillation tower, the recovery tower gas phase pipeline 2 is connected to the recovery tower reflux device, and the recovery tower reflux device is connected to the upper part of the recovery tower.

[0016] As a preferred embodiment, the recovery tower reflux device includes a recovery tower reflux tank, the recovery tower gas phase pipeline 2 is connected to the recovery tower reflux tank, a recovery tower air cooler is provided on the recovery tower gas phase pipeline 2, the bottom of the recovery tower reflux tank is connected to the upper part of the recovery tower through the recovery tower reflux pipeline, and a recovery tower reflux pump is provided on the recovery tower reflux pipeline.

[0017] As a preferred solution, a distillation tower steam reboiler is provided at the lower part of the distillation tower.

[0018] As a preferred solution, a recovery tower steam reboiler is provided at the lower part of the recovery tower.

[0019] This application has the following advantages:

[0020] (1) The configuration of compressor 1, compressor 2, and compressor 3 changes the steam heating mode in the traditional process and can convert the low-grade methanol vapor at the top of the distillation tower into high-grade thermal energy. While compressor 1 provides heat for the reaction tower, refined methanol can also promote the synthesis of sodium methoxide. Compressor 2 and compressor 3 provide the required heat for the reboiler of the distillation tower and the reboiler of the recovery tower respectively. The heat at the top of the distillation tower is fully utilized, and only a small amount of steam is required to supplement the reboiler of the reaction tower in the reactor of the reaction tower, thereby greatly improving the energy utilization efficiency.

[0021] (2) Improving product purity, the methanol vapor after heating the reboiler of the distillation tower and the reboiler of the recovery tower is condensed and refluxed to the distillation tower for secondary distillation, which effectively improves product purity; preferably, part of the 99.8% methanol vapor generated at the top of the recovery tower is refluxed after condensation, and part is sent back to the middle of the distillation tower for secondary distillation, which further improves product purity;

[0022] (3) Reduce energy consumption: The bottom of the distillation tower contains a methanol-water solution with 50% methanol. Its lower bottom temperature reduces the demand for high-grade heat energy in the reboiler of the distillation tower, thereby significantly reducing the power consumption of compressor 2;

[0023] (4) Significant energy-saving effect: The power consumption of the present application is 316 kg / ton of 30% sodium methoxide solution; after conversion into steam consumption, only 0.41 tons of steam are required to produce one ton of sodium methoxide, which has a strong energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of this application;

[0025] 1. Reaction tower; 2. Distillation tower; 3. Recovery tower; 4. Reaction tower top extraction pipeline; 5. Reaction tower kettle extraction pipeline; 6. Solution extraction pipeline; 7. Solution cooler; 8. Feed pipeline; 9. Feed preheater; 10. Distillation tower kettle pipeline; 11. Distillation tower kettle pump; 12. Recovery tower kettle pipeline; 13. Wastewater pump; 14. Reaction tower reboiler; 15. Distillation tower reboiler; 16. Recovery tower reboiler; 17. Distillation tower gas phase pipeline 1; 18. Compressor 1; 19. Distillation tower gas phase pipeline 2; 20. Compressor 2; 21. Compressor 3; 22. Distillation tower gas phase pipeline 3; 23. Distillation tower reboiler discharge pipeline; 24. Recovery tower reboiler discharge pipeline; 25. Distillation tower cooler; 26. Distillation tower reflux tank; 27. Reflux pump; 28. Recovery tower gas phase pipeline 1; 29. ​​Recovery tower gas phase pipeline 2; 30. Recovery tower reflux tank; 31. Recovery tower air cooler; 32. Recovery tower reflux pipeline; 33. Recovery tower reflux pump; 34. Distillation tower steam reboiler; 35. Recovery tower steam reboiler. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 The specific implementation of the utility model is described in detail. It should be noted that the specific implementation described here is only used to illustrate and explain the utility model, and is not used to limit the utility model.

[0027] Embodiment 1:

[0028] The present application provides an energy-saving device for producing sodium methoxide, comprising a reaction tower 1, a distillation tower 2, and a recovery tower 3 connected in sequence; the pressure of the distillation tower 2 is normal pressure, the top temperature of the distillation tower 2 is 65° C., and the bottom temperature is 77° C.; the pressure of the recovery tower 3 is normal pressure, the top temperature of the recovery tower 3 is 66° C., and the bottom temperature is 104° C.

[0029] The top of the reaction tower 1 is connected to the distillation tower 2 through the reaction tower top extraction pipeline 4, and the methanol water vapor at the top of the reaction tower 1 enters the distillation tower 2. The reactor of the reaction tower 1 is provided with a reaction tower reactor extraction pipeline 5, and the reaction tower reactor extraction pipeline 5 and the solution extraction pipeline 6. The reaction tower reactor extraction pipeline 5 extracts the solid in the reaction tower 1 and transports it to the solid workshop for the next step of processing. The solution extraction pipeline 6 extracts 30% sodium methoxide solution and methanol solution at 105°C. The solution extraction pipeline 6 is provided with a solution cooler 7, and the solution cooler 7 cools the 30% sodium methoxide solution and methanol solution to 40°C for extraction; a feed pipeline 8 is provided on one side of the reaction tower 1, and a feed preheater 9 is provided on the feed pipeline 8. The 50°C sodium hydroxide solution and the methanol solution are preheated to 80°C by the feed preheater 9 and enter the reaction tower 1 for reaction;

[0030] The bottom of the distillation tower 2 is connected to the recovery tower 3 through the distillation tower kettle pipeline 10. The kettle of the distillation tower 2 contains 50% methanol aqueous solution, and its temperature is maintained at a relatively low level of 77°C; the distillation tower kettle pipeline 10 is provided with a distillation tower kettle pump 11, and 50% of the methanol liquid produced from the distillation tower 2 kettle enters the recovery tower 3. The kettle of the recovery tower 3 is provided with a recovery tower kettle pipeline 12, and the recovery tower kettle pipeline 12 is provided with a wastewater pump 13, and the recovery tower kettle pipeline 12 produces wastewater;

[0031] The reactors of the distillation tower 2 and the recovery tower 3 are respectively provided with a distillation tower reboiler 15 and a recovery tower reboiler 16, which are respectively provided with a distillation tower falling film reboiler and a recovery tower falling film reboiler. The reactor of the reaction tower 1 is provided with a reaction tower reboiler 14, which is provided with an inner coil heater. The reaction tower reboiler 14 is arranged on the inner side of the reactor of the reaction tower 1 to save space and facilitate the transfer and utilization of heat. The top of the distillation tower 2 is connected to the reaction tower 1 through a distillation tower gas phase pipeline 17. The tower kettle is connected, the distillation tower gas phase pipeline one 17 is provided with a compressor one 18, the distillation tower gas phase pipeline one 17 is connected to the distillation tower gas phase pipeline two 19, the distillation tower gas phase pipeline two 19 is connected to the recovery tower reboiler 16, the distillation tower gas phase pipeline two 19 is provided with a compressor two 20 and a compressor three 21, the distillation tower gas phase pipeline two 19 between the compressor two 20 and the compressor three 21 is connected to the distillation tower gas phase pipeline three 22, the distillation tower gas phase pipeline three 22 is connected to the distillation tower reboiler 15, the distillation tower reboiler discharge pipeline 2 3 is connected to the middle and upper part of the distillation tower 2, and a distillation tower reflux device is provided on the distillation tower reboiler discharge pipeline 23, and the distillation tower reflux device is also connected to the recovery tower reboiler 16 through the recovery tower reboiler discharge pipeline 24; preferably, the distillation tower reflux device includes a distillation tower cooler 25, a distillation tower reflux tank 26, and a reflux pump 27 connected in sequence; more preferably, the recovery tower reboiler discharge pipeline 24 is connected to the distillation tower reflux device through the feed preheater 9, and the heat of the tower top is further utilized, more specifically, the recovery tower reboiler discharge pipeline 24 is connected to the distillation tower reflux device. Line 24 is connected to the distillation tower reflux tank 26, and the methanol vapor after heat exchange with the distillation tower reboiler 15 enters the distillation tower reflux tank 26 after being cooled by the distillation tower cooler 25, and the liquid methanol after heat exchange with the feed preheater 9 enters the distillation tower reflux tank 26, and the methanol in the distillation tower reflux tank 26 returns to the distillation tower 2; the function of compressor 1 18 and compressor 2 20 is to convert the low-grade thermal energy of the methanol vapor at the top of the distillation tower 2 into high-grade thermal energy, and compressor three 21 further converts the methanol vapor pressurized and heated by compressor two 20 into higher-grade thermal energy.

[0032] The methanol vapor at the top of the distillation tower 2 is divided into three parts, one part of which is compressed to 105°C by a compressor 18 and then sent back to the reaction tower 1 for recycling, which not only promotes the forward reaction but also provides the required heat for the reaction tower 1; one part is heated to 88°C saturated vapor by a compressor 2 20 for the low-grade methanol vapor at the top of the distillation tower 2, providing a heat source for the distillation tower reboiler 15, that is, providing the heat required for the distillation of the distillation tower 2, and the liquid methanol after heat exchange with the distillation tower reboiler 15 is refluxed to the distillation tower 2 to continue distillation, thereby increasing the concentration of the product; one part is heated to 115°C saturated vapor by a compressor 3 21 for the recovery tower reboiler The heat source is provided by the reboiler 16, that is, the heat required for distillation is provided for the recovery tower 3. The methanol vapor after heat exchange with the recovery tower reboiler 16 continues to provide heat for the feed preheater 9, and then flows back to the distillation tower 2; when entering the feed preheater 9, the feed temperature of the reaction tower 1 is increased to 80°C; the low-grade methanol vapor at the top of the distillation tower 2 can be converted into high-grade thermal energy through the arrangement of the compressor 1 18, the compressor 2 20, and the compressor 3 21. While the compressor 1 18 provides heat for the reaction tower 1, the refined methanol can also promote the synthesis of sodium methoxide. The compressor 2 20 and the compressor 3 21 respectively provide the required heat for the distillation tower reboiler 15 and the recovery tower reboiler 16, so as to realize heat recycling, thereby greatly improving the energy utilization efficiency;

[0033] In this embodiment, in order to reduce the power consumption of compressor 20, the bottom of the distillation tower 2 contains 50% methanol aqueous solution, and its temperature is maintained at a relatively low level of 77°C. This not only reduces the load of the distillation tower reboiler 15, but also makes the compressor 20 consume less energy when providing a heat source. The 50% methanol aqueous solution then enters the recovery tower 3 to continue to recover methanol, thereby reducing energy consumption.

[0034] Embodiment 2:

[0035] In order to further increase the concentration of the product, the following solutions are provided:

[0036] The top of the recovery tower 3 is provided with a recovery tower gas phase pipeline 1 28 and a recovery tower gas phase pipeline 2 29, the recovery tower gas phase pipeline 1 28 is connected to the middle and lower part of the distillation tower 2, the recovery tower gas phase pipeline 2 29 is connected to the recovery tower reflux device, and the recovery tower reflux device is connected to the upper part of the recovery tower 3; specifically: the recovery tower reflux device includes a recovery tower reflux tank 30, the recovery tower gas phase pipeline 2 29 is connected to the recovery tower reflux tank 30, a recovery tower air cooler 31 is arranged on the recovery tower gas phase pipeline 2 29, the bottom of the recovery tower reflux tank 30 is connected to the upper part of the recovery tower 3 through the recovery tower reflux pipeline 32, and a recovery tower reflux pump 33 is arranged on the recovery tower reflux pipeline 32; part of the methanol vapor containing 99.8% generated at the top of the recovery tower 3 is refluxed after condensation, and part is sent back to the middle part of the distillation tower 2 for secondary distillation to improve the purity of the methanol vapor without increasing the heat load of the distillation tower 2.

[0037] A distillation tower steam reboiler 34 is provided at the lower part of the distillation tower 2, and the distillation tower steam reboiler 34 is heated by steam; a recovery tower steam reboiler 35 is provided at the lower part of the recovery tower 3, and the recovery tower steam reboiler 35 is heated by steam; the distillation tower steam reboiler 34 and the recovery tower steam reboiler 35 are only used when starting up or when the system steam is unstable, and are not used under normal working conditions; the process realizes the production of sodium methoxide and the recovery and reuse of methanol by adopting three key equipments, namely, the reaction tower 1, the distillation tower 2 and the recovery tower 3. In order to reduce energy consumption, the system innovatively uses compressors to provide the required heat instead of relying on additional steam for heating; the distillation tower steam reboiler 34 and the recovery tower steam reboiler 35 are used in the startup stage. After startup, the steam at the top of the distillation tower 2 is pressurized and heated by each compressor, and directly provides heat for the reaction tower 1, the distillation tower reboiler 15 and the recovery tower reboiler 16, and no additional steam supply is required, thereby realizing heat self-sufficiency.

[0038] The present invention not only improves the efficiency of sodium methoxide production, but also significantly reduces energy consumption, thereby achieving a more environmentally friendly and energy-saving production process.

[0039] In summary, due to the adoption of the above technical solution, the present application has the following advantages:

[0040] 1. The setting of compressor 1, compressor 2 and compressor 3 has changed the mode of steam heating in the traditional process, and can convert the low-grade methanol vapor at the top of the distillation tower into high-grade thermal energy. While compressor 1 provides heat for the reaction tower, refined methanol can also promote the synthesis of sodium methoxide. Compressor 2 and compressor 3 provide the required heat for the reboiler of the distillation tower and the reboiler of the recovery tower respectively; the heat at the top of the distillation tower is fully utilized, and only a small amount of steam is needed to supplement the reactor of the reaction tower, thereby greatly improving the energy utilization efficiency;

[0041] 2. Improve product purity. After heating the reboiler of the distillation tower and the reboiler of the recovery tower, the methanol vapor is condensed and refluxed to the distillation tower for secondary distillation, which effectively improves product purity. Preferably, part of the methanol vapor containing 99.8% produced at the top of the recovery tower is refluxed after condensation, and part is sent back to the middle of the distillation tower for secondary distillation, which further improves product purity.

[0042] 3. Reduce energy consumption: The bottom of the distillation tower contains a methanol-water solution with 50% methanol. Its lower bottom temperature reduces the demand for high-grade thermal energy in the reboiler of the distillation tower, thereby significantly reducing the power consumption of the second compressor;

[0043] 4. Significant energy-saving effect: The power consumption of this application is 316 kg / ton of 30% sodium methoxide solution; after conversion into steam consumption, only 0.41 tons of steam are needed to produce one ton of sodium methoxide, which has a strong energy-saving effect. (Note: 1 kWh of electricity is equivalent to 0.123 kg of standard coal or 0.0013 tons of steam.)

[0044] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings; however, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, a variety of simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the protection scope of the present application.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of this application will not be described separately.

[0046] In addition, the various implementation modes of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. An energy-saving device for producing sodium methoxide, comprising a reaction tower (1), a distillation tower (2), and a recovery tower (3) connected in sequence, wherein the distillation tower (2) and the recovery tower (3) are respectively provided with a distillation tower reboiler (15) and a recovery tower reboiler (16), the reactor of the reaction tower (1) is provided with a reaction tower reboiler (14), the top of the distillation tower (2) is connected to the reactor of the reaction tower (1) through a distillation tower gas phase pipeline (17), and a compressor (18) is provided on the distillation tower gas phase pipeline (17), characterized in that: The first rectifying tower gas phase pipeline (17) is connected to the second rectifying tower gas phase pipeline (19), and the second rectifying tower gas phase pipeline (19) is connected to the recovery tower reboiler (16). The second rectifying tower gas phase pipeline (19) is provided with a second compressor (20) and a third compressor (21). The second rectifying tower gas phase pipeline (19) between the second compressor (20) and the third compressor (21) is connected to the third rectifying tower gas phase pipeline (22), and the third rectifying tower gas phase pipeline (22) is connected to the rectifying tower reboiler (15). The rectifying tower reboiler discharge pipeline (23) is connected to the middle and upper part of the rectifying tower (2), and the recovery tower reboiler discharge pipeline (24) is connected to the middle and upper part of the rectifying tower (2).

2. An energy-saving device for producing sodium methoxide according to claim 1, characterized in that: A distillation tower reflux device is provided on the distillation tower reboiler discharge pipeline (23), and the distillation tower reflux device is also connected to the recovery tower reboiler discharge pipeline (24) of the recovery tower reboiler (16).

3. An energy-saving device for producing sodium methoxide according to claim 2, characterized in that: The distillation tower reflux device comprises a distillation tower cooler (25), a distillation tower reflux tank (26), and a reflux pump (27) which are connected in sequence.

4. An energy-saving device for producing sodium methoxide according to claim 2, characterized in that: A feed pipeline (8) is provided on one side of the reaction tower (1), and a feed preheater (9) is provided on the feed pipeline (8).

5. An energy-saving device for producing sodium methoxide according to claim 4, characterized in that: The recovery tower reboiler discharge pipeline (24) is connected to the distillation tower reflux device through the feed preheater (9).

6. An energy-saving device for producing sodium methoxide according to claim 1, characterized in that: The top of the recovery tower (3) is provided with a recovery tower gas phase pipeline 1 (28) and a recovery tower gas phase pipeline 2 (29); the recovery tower gas phase pipeline 1 (28) is connected to the middle and lower part of the distillation tower (2); the recovery tower gas phase pipeline 2 (29) is connected to the recovery tower reflux device; and the recovery tower reflux device is connected to the upper part of the recovery tower (3).

7. An energy-saving device for producing sodium methoxide according to claim 6, characterized in that: The recovery tower reflux device comprises a recovery tower reflux tank (30), the recovery tower gas phase pipeline 2 (29) is connected to the recovery tower reflux tank (30), a recovery tower air cooler (31) is arranged on the recovery tower gas phase pipeline 2 (29), and the bottom of the recovery tower reflux tank (30) is connected to the upper part of the recovery tower (3) through the recovery tower reflux pipeline (32).

8. An energy-saving device for producing sodium methoxide according to claim 1, characterized in that: A distillation tower steam reboiler (34) is provided at the lower part of the distillation tower (2).

9. An energy-saving device for producing sodium methoxide according to claim 1, characterized in that: A recovery tower steam reboiler (35) is provided at the lower part of the recovery tower (3).

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