A device for slowing down corrosion of bistrifluoromethylsulfonimide acid enamel retort

Abstract

The present application belongs to the technical field of anti-erosion and anti-corrosion protection structure of the pipe orifice of an enamel distillation kettle for processing highly corrosive media, and particularly relates to a device for slowing down corrosion of a bistrifluoromethyl sulfonimide acid enamel distillation kettle. The device comprises protective sleeve pipes which are detachably installed on different pipe orifices of the enamel distillation kettle; the protective sleeve pipes comprise at least one of a T-shaped sleeve pipe for protecting a pipe orifice with reflux, a Y-shaped plug-in protective sleeve for protecting a bottom discharge port, and a U-shaped sleeve pipe for protecting a top feed port. The present application prolongs the service life of the enamel reaction kettle by transferring the corrosion and erosion to replaceable protective sleeve pipes.

Description

Technical Field

[0001] This invention belongs to the technical field of anti-erosion and corrosion protection structure for the nozzle of enamel distillation kettles used for processing highly corrosive media, and specifically relates to a device for mitigating corrosion of bis(trifluoromethanesulfonyl)imide enamel distillation kettles. Background Technology

[0002] Di(trifluoromethanesulfonyl)imide acid is extremely corrosive. In industrial production, the purification of bis(trifluoromethanesulfonyl)imide acid usually requires a distillation process, and the distillation vessel is often a glass-lined (enamel-lined) reactor or distillation vessel. Enameled equipment is made by coating a metal substrate with a high-silicon content enamel and then sintering it at high temperatures. However, although the enamel layer is corrosion-resistant, it has inherent weaknesses such as high brittleness and poor resistance to mechanical and thermal shock. During dynamic operations such as distillation, complex conditions such as material flow, temperature changes, and vacuum suction pose a serious threat of erosion and corrosion to the enamel layer, especially in stress concentration areas such as equipment nozzles. The enamel-lined distillation vessel in the bis(trifluoromethanesulfonyl)imide acid purification system mainly faces the following three typical erosion and corrosion problems: (1) During distillation, the reflux liquid condensed at the top of the column returns to the reactor through the reflux pipe. Under the influence of gravity, the reflux liquid continuously impacts the inner wall of the reflux pipe inlet, the edge of the weld connecting the pipe inlet and the reactor body, and the area near the flange sealing surface in the form of droplets or fine streams. In addition, due to the extremely strong corrosiveness of bis(trifluoromethanesulfonyl)imide acid, it will gradually wear down and penetrate the enamel layer in this area, thereby affecting the entire enamel-lined equipment.

[0003] (2) When a raw material liquid with a high density or low temperature is added from the top feed inlet, the material forms a high-speed falling liquid column under the action of gravity, directly impacting the inner wall of the bottom of the reactor, especially the area near the center of the bottom or the discharge port. Continuous concentrated impact will generate microcracks in these areas, which will then lead to the peeling of the enamel layer and corrosion of the metal substrate. This impact corrosion is highly concealed and is usually only discovered during equipment maintenance, resulting in high repair costs.

[0004] (3) During the discharge process, the fluid flows from the large cross-section of the reactor into the small cross-section discharge pipe, and the flow velocity increases sharply. The corrosive medium carried by the high-speed fluid causes strong scouring and abrasion on the inner wall of the discharge port short section and the valve inlet. The erosion corrosion rate in this area is higher than that in other parts, making it a relatively weak point of the enamel equipment.

[0005] To address the aforementioned issues, the following are the main existing technical solutions in the field of corrosion protection for chemical equipment: The first type involves replacing the materials with highly corrosion-resistant materials such as Hastelloy, tantalum, titanium, or high-silicon cast iron. However, this type of equipment is expensive.

[0006] The second method involves spraying or lining the inner surface of the equipment with corrosion-resistant materials such as polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF). However, the thickness of the sprayed layer is limited, the spraying process is difficult, and it may still penetrate localized erosion points.

[0007] The third method is to extend the service life by increasing the thickness of the enamel layer or metal wall. However, this does not fundamentally solve the problem of localized erosion.

[0008] In summary, to address the challenge of localized erosion corrosion at the nozzle caused by hydrodynamic effects during the purification process of highly corrosive media such as bis(trifluoromethanesulfonyl)imide acid in enamel-lined distillation kettles, there is an urgent need for a solution that is simple in structure, low in cost, easy to implement, and can effectively provide targeted protection. Summary of the Invention

[0009] To address the problem of localized erosion corrosion at the nozzle caused by hydrodynamic effects during the purification of highly corrosive media such as bis(trifluoromethanesulfonyl)imide acid in enamel-lined distillation kettles, this invention proposes a solution that is simple in structure, low in cost, easy to implement, and provides effective targeted protection.

[0010] The technical solution of the present invention is as follows: A device for mitigating corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel includes protective sleeves detachably installed at different ports of the enamel distillation vessel; the protective sleeves include at least one of a T-type sleeve for protecting ports with reflux, a Y-type insert-type protective sleeve for protecting the bottom discharge port, and a U-type sleeve for protecting the top feed port.

[0011] Preferably, the T-shaped sleeve includes a vertical pipe and a connecting flange disposed at one end of the vertical pipe; the inner diameter of the vertical pipe is greater than or equal to the nominal diameter of the enamel-lined distillation vessel nozzle to which it is connected; the length of the vertical pipe extends into the enamel-lined distillation vessel, and the length of the portion of the vertical pipe extending into the vessel is not less than twice the nominal diameter of the nozzle; the connecting flange is clamped and fixed between the enamel-lined distillation vessel nozzle flange and the external pipe flange; the vertical pipe and the connecting flange communicate to form a medium channel.

[0012] Preferably, the wall thickness of the T-shaped sleeve is not less than 1 / 10 of the inner diameter of the sleeve.

[0013] Preferably, the Y-shaped insertable protective sleeve includes a flared head and a tubular tail integrally connected to the flared head; the tubular tail is inserted into and fixed inside the discharge port of the enamel distillation kettle; the flared head covers and adheres to the inner wall of the kettle bottom corresponding to the discharge port.

[0014] Preferably, the outer diameter of the flared head is 2.5 to 3.5 times the inner diameter of the discharge port.

[0015] Preferably, the tubular tail and the discharge port are fixed by interference fit, threaded connection or flange cover; when interference fit is used, the outer diameter of the tubular tail is 1.005 to 1.02 times the inner diameter of the discharge port.

[0016] Preferably, the U-shaped sleeve includes an inlet section, a buffer bend section, and an outlet section connected in sequence; the inlet section is connected to an external feed pipe; the outlet section extends into the interior of the enamel-lined distillation vessel; the bending radius of the buffer bend section is 3 to 5 times the nominal diameter of the inlet section; and the end opening of the outlet section faces upward.

[0017] Preferably, the end of the outlet section extends to a position close to the end cap on the wall of the enamel-lined distillation vessel, and the distance between the end of the outlet section and the inner wall of the enamel-lined distillation vessel is 50mm to 150mm.

[0018] Preferably, the material of the T-shaped sleeve, Y-shaped insert protective sleeve and U-shaped sleeve is any one of polytetrafluoroethylene, polyvinylidene fluoride or perfluoroalkoxy resin.

[0019] This invention addresses the problem of localized erosion and corrosion at the inlet and bottom of enamel-lined reactors during the purification process of bis(trifluoromethanesulfonyl)imide acid. By designing detachable protective sleeves with different structures, it achieves protection for the easily corroded and vulnerable parts of the enamel-lined reactor, and has many beneficial effects compared to existing technologies.

[0020] First, this invention designs T-shaped sleeves, Y-shaped insert-type protective sleeves, and U-shaped sleeves respectively, solving three typical erosion and corrosion problems: reflux liquid impacting the enamel layer of the reflux port, concentrated impact of the feed liquid column on the bottom of the vessel, and high-speed discharge fluid scouring the discharge port. By transferring the corrosion and erosion effects to the replaceable protective sleeves, direct contact between the highly corrosive medium and the vulnerable parts of the enamel-lined reactor is isolated, thus extending the service life of the enamel-lined reactor.

[0021] Secondly, the protective sleeve of this invention has a simple structure, made of commonly used corrosion-resistant materials such as polytetrafluoroethylene, polyvinylidene fluoride, or perfluoroalkoxy resin. This results in low material and processing costs, eliminating the need for any modifications to the existing enamel-lined reactor structure and significantly reducing the investment cost for equipment corrosion protection upgrades. Furthermore, all protective sleeves of this invention are detachable. When the protective sleeve becomes worn or corroded due to long-term use, only the corresponding flange needs to be removed or the old sleeve replaced with a new one. Simultaneously, the three types of protective sleeves of this invention can be used individually or in any combination according to actual production conditions, exhibiting strong adaptability and meeting the corrosion protection requirements of bis(trifluoromethanesulfonyl)imide acid purification production under different scales and process conditions. Attached Figure Description

[0022] Appendix Figure 1 Schematic diagram of a distillation and purification system for bis(trifluoromethanesulfonyl)imide acid; Appendix Figure 2 Top view of the T-shaped sleeve; Appendix Figure 3 This is a front view of the T-shaped sleeve; Appendix Figure 4 This is an isometric view of the T-shaped sleeve. Appendix Figure 5 This is a diagram showing the T-sleeve not being installed; Appendix Figure 6 Diagram for installing a T-sleeve at the return port; Appendix Figure 7 Diagram showing the installation of a Y-type insert protective sleeve at the discharge port; Appendix Figure 8 Diagram for installing a U-shaped sleeve at the feed inlet; Appendix Figure 9 This is an enlarged view of the U-shaped sleeve.

[0023] Attached diagram labels: 1. Enameled distillation kettle; 2. Feed inlet; 3. Reflux outlet; 4. Discharge outlet; 5. Receiving tank; 200. U-shaped sleeve; 201. Inlet section; 202. Buffer bend; 203. Outlet section; 300. T-shaped sleeve; 301. Vertical pipe; 302. Connecting flange; 400. Y-type insert protective sleeve; 401. Flared head; 402. Tubular tail. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0025] Example 1

[0026] This embodiment provides a distillation and purification system for bis(trifluoromethanesulfonyl)imide acid. (See [link to documentation]) Figure 1 It includes an enamel-lined distillation vessel 1 and a receiving tank 5.

[0027] The enamel-lined distillation vessel 1 is a vertical enamel-lined distillation vessel. Its top is provided with a feed port 2 for adding crude bis(trifluoromethanesulfonyl)imide acid to be purified and a reflux port 3 for discharging distillation steam. Its bottom is provided with a discharge port 4 for discharging distillation residue.

[0028] The reflux port 3 of the enamel-lined distillation kettle 1 is connected to the top inlet of the receiving tank 5 via a pipeline. A first condenser 6 and a second condenser 7 are sequentially installed on the pipeline connecting the enamel-lined distillation kettle 1 and the receiving tank 5. The first condenser 6 is positioned near the reflux port 3, and the second condenser 7 is positioned near the inlet of the receiving tank 5.

[0029] The working process of this embodiment is as follows: The crude bis(trifluoromethanesulfonyl)imide acid to be purified is added to the enamel-lined distillation vessel 1 through the feed port 2, and the material in the vessel is distilled. The bis(trifluoromethanesulfonyl)imide acid vapor produced by distillation is discharged from the reflux port 3 and enters the first condenser 6. Most of the vapor is condensed into liquid in the first condenser 6, and part of the condensate is returned to the enamel-lined distillation vessel 1 through the reflux port 3. The small amount of vapor that is not condensed by the first condenser 6 is further condensed into liquid in the second condenser 7. Finally, the condensed bis(trifluoromethanesulfonyl)imide acid liquid flows into the receiving tank 5 for collection. After distillation is completed, the material in the vessel is discharged from the discharge port 4.

[0030] Testing showed that the system of this embodiment can achieve a purity of over 99.9% and a yield of 96.2% when used for distillation and purification of crude bis(trifluoromethanesulfonyl)imide acid. The system also showed no significant corrosion after 6 months of continuous operation.

[0031] Example 2

[0032] This embodiment is based on Embodiment 1, with improvements made to the corrosion resistance of the reflux port 3 of the enamel distillation kettle 1. The rest of the structure is the same as in Embodiment 1.

[0033] like Figures 1-6 As shown, this embodiment provides a T-shaped sleeve protection structure for the reflux port of an enamel-lined distillation vessel used in a bis(trifluoromethanesulfonyl)imide acid distillation purification system to prevent corrosion. A T-shaped sleeve 300 is provided at the top reflux port 3 of the enamel-lined distillation vessel 1 to protect the enamel layer of the reflux port from erosion and corrosion by the reflux liquid.

[0034] The material of the T-type sleeve 300 can be polytetrafluoroethylene, polyvinylidene fluoride or perfluoroalkoxy resin. The T-type sleeve 300 includes a riser 301 and a connecting flange 302.

[0035] During installation, insert the vertical pipe 301 of the T-type sleeve 300 into the enameled distillation vessel 1 from the outside of the reflux port 3. Then, clamp the connecting flange 302 of the T-type sleeve 300 between the reflux port flange of the enameled distillation vessel and the external reflux pipe flange. Tighten the two flanges with bolts to fix the T-type sleeve 300. The length of the vertical pipe extending into the vessel should not be less than twice the nominal diameter of the pipe opening, and the wall thickness of the vertical pipe of the T-type sleeve should not be less than 1 / 10 of the inner diameter of the vertical pipe. After installation, the lower end of the vertical pipe 301 extends into the enameled distillation vessel 1.

[0036] The working principle of this embodiment is as follows: Before improvement (see) Figure 5 The reflux droplets fall directly from the reflux pipe, impacting the inner wall of the vessel body at high speed. Due to the strong corrosiveness of bis(trifluoromethanesulfonyl)imide acid, long-term erosion will gradually peel off and damage the enamel layer, exposing the metal substrate of the vessel body and causing leakage.

[0037] Improved (see) Figure 6 The reflux droplets first impact the inner wall of the T-shaped sleeve riser 301. Because the riser 301 is long enough, the impact point is entirely inside the sleeve, far from the vulnerable inner wall of the enamel-lined nozzle and the flange sealing surface. Therefore, erosion corrosion only occurs on the inner wall of the polyvinylidene fluoride sleeve, while the enamel layer at the reflux port of the enamel-lined distillation vessel is completely protected.

[0038] When the T-type sleeve 300 is damaged due to long-term use, simply loosen the bolts of the connecting flange, remove the old sleeve, and replace it with a new T-type sleeve. There is no need to disassemble the entire distillation system or replace the expensive enamel distillation kettle, which reduces maintenance costs and downtime.

[0039] Example 3

[0040] This embodiment is based on Embodiment 1, with improvements made to the corrosion resistance of the bottom discharge port 4 and the bottom of the enamel-lined distillation vessel 1. This embodiment can also be used in combination with Embodiment 2.

[0041] like Figure 1 and Figure 7 As shown, this embodiment provides a Y-shaped insert-type protective sleeve structure for corrosion protection of the bottom of an enamel distillation vessel in a bis(trifluoromethanesulfonyl)imide acid distillation purification system. A Y-shaped insert-type protective sleeve 400 is provided at the bottom discharge port 4 of the enamel distillation vessel 1 to protect the discharge port and the surrounding inner wall of the vessel bottom from erosion and corrosion.

[0042] The Y-type insert protective sleeve 400 can be made of polytetrafluoroethylene, polyvinylidene fluoride or perfluoroalkoxy resin. The Y-type insert protective sleeve 400 includes a flared head 401 and a tubular tail 402.

[0043] The tubular tail section 402 is a cylindrical straight tube whose outer diameter matches the inner diameter of the enamel discharge port 4. It can be securely inserted and fixed into the discharge port 4 by means of interference fit (when interference fit is used, the outer diameter of the tubular tail section is 1.005 to 1.02 times the inner diameter of the discharge port), threaded connection, or flange tightening. The flared head 401 is a disc-shaped or umbrella-shaped structure with an outer edge dimension 2.5 to 3.5 times larger than the diameter of the discharge port 4. Its lower surface is machined flat to ensure that it can fit tightly against and cover the area around the discharge port 4 on the inner wall of the vessel bottom after installation.

[0044] The working principle of this embodiment is as follows: Feed protection function: When crude bis(trifluoromethanesulfonyl)imide is added to the reactor from the top feed port 2, the falling liquid column will directly impact the upper surface of the flared head 401 of the Y-type insert protective sleeve 400. The large-area flared head 401 can effectively withstand and disperse the impact force of the liquid column, preventing the liquid column from directly impacting the enamel layer at the bottom of the reactor, and preventing the enamel layer at the bottom of the reactor from cracking or peeling off due to long-term impact.

[0045] Feeding protection function: When feeding is carried out after distillation, the fluid in the vessel first flows from the edge of the flared head 401 to the center, and then flows out of the feed port 4 through the tubular tail 402. The strong turbulence and erosion corrosion caused by the rapid increase in fluid velocity occur entirely on the inner wall of the tubular tail 402, while the inner wall of the enamel feed port is protected and will not be eroded by the fluid.

[0046] When the Y-type insert protective sleeve 400 is worn or corroded due to long-term use, only a new protective sleeve needs to be replaced. There is no need to empty the material inside the vessel or disassemble the external pipeline, making maintenance extremely convenient.

[0047] Example 4

[0048] This embodiment is based on Embodiment 1, with improvements made to the corrosion resistance of the top feed inlet 2 of the enamel distillation vessel 1. The rest of the structure is the same as in Embodiment 1. This embodiment can also be used in any combination with Embodiments 2 and 3.

[0049] like Figure 1 , Figure 8 and Figure 9 As shown, this embodiment provides a U-shaped sleeve structure for corrosion protection of the feed inlet of an enamel-lined distillation vessel in a bis(trifluoromethanesulfonyl)imide acid distillation purification system. A U-shaped sleeve 200 is installed at the top feed inlet 2 of the enamel-lined distillation vessel 1 to protect the bottom of the vessel from concentrated impact corrosion by the feed liquid column.

[0050] The U-shaped sleeve 200 can be made of polytetrafluoroethylene, polyvinylidene fluoride or perfluoroalkoxy resin. The U-shaped sleeve 200 includes an inlet section 201, a buffer bend section 202 and an outlet section 203 connected in sequence.

[0051] The inlet section 201 is located outside the enamel-lined distillation vessel 1, and its end is equipped with a connecting flange for bolting connection to the external feed pipe flange and the vessel body feed port flange. The buffer bend 202 effectively reduces eddies and pressure loss during fluid turning; the bending radius of the buffer bend is 3 to 5 times the nominal diameter of the inlet section. The outlet section 203 extends horizontally from the buffer bend 202 into the interior of the enamel-lined distillation vessel 1, with its end opening facing vertically upward, and the distance between the end and the inner wall of the vessel is 50mm to 150mm to prevent the fluid from directly impacting the vessel wall.

[0052] During installation, insert the outlet section 203 of the U-shaped sleeve 200 into the reactor from the outside of the inlet 2, adjust the outlet section 203 to a horizontal position with the opening facing upward, and then clamp the connecting flange of the inlet section 201 between the reactor body inlet flange and the external feed pipe flange, and tighten it with bolts.

[0053] The working principle of this embodiment is as follows: Before the improvement, the crude bis(trifluoromethanesulfonyl)imide acid fell vertically directly from the top feed inlet, forming a high-speed liquid column that continuously impacted the same part of the bottom of the reactor. Long-term operation would cause fatigue cracks in the enamel layer at that point and gradually peel off, eventually leading to corrosion and leakage of the reactor body.

[0054] After the improvement, during feeding, the corrosive liquid enters the U-shaped sleeve vertically from the inlet section 201. Smoothly guided by the buffer bend 202, the fluid flow reverses direction. Under the combined action of centrifugal force and pipe wall friction, most of the fluid's kinetic energy is reduced. Finally, the fluid flows horizontally out from the outlet section 203, which has an upward-facing opening. Because the opening is upward, the fluid must first overcome gravity to surge upward a short distance before overflowing in all directions, further consuming the remaining kinetic energy.

[0055] The horizontally flowing fluid tangentially impacts the vessel wall and, under gravity, forms a uniform thin liquid film that slowly flows down the wall. This process completely avoids concentrated vertical impact from the liquid column on any point on the vessel bottom, dispersing the erosion effect over a large area of ​​the vessel wall and greatly reducing the risk of localized impact damage. Simultaneously, the liquid always remaining within the U-shaped structure provides a reliable liquid seal, effectively preventing external air from being drawn back into the vessel when it is under negative pressure, thus avoiding product oxidation and contamination.

[0056] Corrosion and erosion mainly occur on the inner wall of the buffer bend 202 of the U-shaped sleeve 200. When the sleeve is damaged due to long-term use, simply remove the inlet flange, take out the old sleeve, and replace it with a new one.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Those skilled in the art, guided by the principles of the present invention, can modify or make equivalent substitutions to the specific parameters and structures, and such modifications or substitutions should all be covered within the scope of protection of the claims of the present invention. For example, the material of the protective sleeve can be selected from different corrosion-resistant plastics or alloys according to the specific corrosive medium; parameters such as the length of the vertical pipe, the diameter of the flared head, and the bending radius can be adjusted according to the actual vessel size and process conditions.

Claims

1. A device for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel, characterized in that, It includes protective sleeves that can be detachably installed at different ports of an enamel-lined distillation vessel; the protective sleeves include at least one of a T-type sleeve for protecting ports with backflow, a Y-type insert-type protective sleeve for protecting the bottom discharge port, and a U-type sleeve for protecting the top feed port.

2. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 1, characterized in that, The T-shaped sleeve includes a vertical pipe and a connecting flange disposed at one end of the vertical pipe; the inner diameter of the vertical pipe is greater than or equal to the nominal diameter of the enamel-lined distillation kettle pipe opening to which it is connected; the length of the vertical pipe extends into the enamel-lined distillation kettle, and the length of the portion of the vertical pipe extending into the kettle is not less than twice the nominal diameter of the pipe opening; the connecting flange is clamped and fixed between the enamel-lined distillation kettle pipe opening flange and the external pipe flange; the vertical pipe and the connecting flange communicate to form a medium channel.

3. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 2, characterized in that, The wall thickness of the vertical tube of the T-shaped sleeve is not less than 1 / 10 of the inner diameter of the vertical tube.

4. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 1, characterized in that, The Y-shaped insertable protective sleeve includes a flared head and a tubular tail integrally connected to the flared head; the tubular tail is inserted into and fixed inside the discharge port of the enamel distillation kettle; the flared head covers and adheres to the inner wall of the kettle bottom corresponding to the discharge port.

5. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 4, characterized in that, The outer diameter of the flared head is 2.5 to 3.5 times the inner diameter of the discharge port.

6. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 4, characterized in that, The tubular tail section is fixed to the discharge port by an interference fit, threaded connection, or flange cover. When an interference fit is used, the outer diameter of the tubular tail section is 1.005 to 1.02 times the inner diameter of the discharge port.

7. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 1, characterized in that, The U-shaped sleeve includes an inlet section, a buffer bend section, and an outlet section connected in sequence; the inlet section is connected to an external feed pipe; the outlet section extends into the interior of the enamel-lined distillation vessel; the bending radius of the buffer bend section is 3 to 5 times the nominal diameter of the inlet section; and the end opening of the outlet section faces upward.

8. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 7, characterized in that, The outlet section extends to a position close to the end cap on the wall of the enamel-lined distillation vessel, and the distance between the end of the outlet section and the inner wall of the enamel-lined distillation vessel is 50mm~150mm.

9. The apparatus for slowing down the corrosion of a bis(trifluoromethanesulfonyl)imide enamel distillation vessel according to claim 1, characterized in that, The T-shaped sleeve, Y-shaped insert protective sleeve, and U-shaped sleeve are made of any one of polytetrafluoroethylene, polyvinylidene fluoride, or perfluoroalkoxy resin.

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