Distillation reaction device for preparing liquid lithium bis (fluorosulfonyl) imide

Abstract

The utility model discloses a distillation reaction device for preparing liquid lithium bis (fluorosulfonyl) imide, which is characterized in that 1-3 feed pipes are arranged at the top of an evaporation tank main body, a steam output pipe is also arranged at the top of the evaporation tank main body, a temperature detector is arranged on the steam output pipe, a material output pipe is arranged at the bottom of the evaporation tank main body, and the temperature detector is arranged on the material output pipe. A constant-temperature electric heater is arranged at the bottom of the interior of the evaporation tank main body, and the distillation reaction device for preparing the liquid lithium bis (fluorosulfonyl) imide improves the conditions that in the actual use process in the prior art, evaporation is only performed on the surface of liquid under the condition that boiling is not performed in the heating process, and the evaporation efficiency is limited by the surface area of the liquid; through a spraying mode, the surface area of liquid evaporation is greatly increased, the evaporation efficiency is improved, and the overall working efficiency of equipment and an assembly line is improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a distillation reaction apparatus for preparing liquid bis(fluorosulfonyl)imide lithium. Background Technology

[0002] Lithium-ion battery electrolytes mainly consist of three parts: solvent, additives, and lithium salt. Regarding lithium salts, lithium hexafluorophosphate is currently the preferred choice due to its excellent conductivity, stability, and environmental friendliness. However, it still has drawbacks such as poor thermal stability, easy decomposition, the production of hydrogen fluoride (which affects battery performance at high temperatures), and easy crystallization at low temperatures.

[0003] The fluoride ions of LiFSI have strong electron-withdrawing properties, and the coordination between the cations and anions of lithium salts is weak and highly active. It has high stability and conductivity, and compared with lithium hexafluorophosphate, it has advantages such as high conductivity, low water sensitivity and good thermal stability.

[0004] LiFSI can be synthesized using either a three-step method or a two-step method (thioyl fluoride method), with the two-step method being the more common approach. The three-step synthesis process consists of three main steps: the synthesis of bis(chlorosulfonyl)imide (chlorination), fluorination, and lithiation, along with subsequent non-critical steps such as filtration and washing. The main raw materials include chlorosulfonic acid, thionyl chloride, aminosulfonic acid, chlorosulfonyl isocyanate (prepared from aminosulfonic acid and phosgene), and sulfur trichloride. The fluorination process typically uses fluoride salts and hydrofluoric acid (hydrogen fluoride). The two-step method (thioyl fluoride method) skips the chlorination process, directly yielding the fluorinated intermediate bis(chlorosulfonyl)imide (HFSI) from thioyl fluoride and lithium nitride. Currently, fewer companies use this method. The lithiation process generally uses alkaline lithium or lithium halides.

[0005] Distillation equipment is an indispensable part of the LiFSI production process. However, in actual use, the existing technology still has the problem that when there is no boiling during the heating process, the liquid will only evaporate on the surface, and the evaporation efficiency is limited by the surface area of ​​the liquid. Utility Model Content

[0006] Therefore, in view of the above problems, this utility model proposes a distillation reaction device for preparing liquid bis(fluorosulfonyl)imide lithium, which solves the technical problem that in the actual use of the prior art, when there is no boiling during the heating process, the liquid will only evaporate on the surface and the evaporation efficiency is limited by the surface area of ​​the liquid.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a distillation reaction apparatus for preparing liquid bis(fluorosulfonyl)imide lithium, the structure of which includes an evaporator body, a feed pipe, a steam output pipe, a temperature detector, a material output pipe, a constant temperature electric heater, a liquid pump, a liquid pump output pipe, an output plate, and a liquid output port. One to three feed pipes are provided at the top of the evaporator body, and a steam output pipe is also provided at the top of the evaporator body. A temperature detector is installed on the steam output pipe. A material output pipe is provided at the bottom of the evaporator body. A constant temperature electric heater is provided at the bottom inside the evaporator body. A liquid pump is located at a lower position inside the evaporator body. The output end of the liquid pump is connected to the liquid pump output pipe, and the upper end of the liquid pump output pipe is connected to the output plate. Multiple liquid output ports are provided on the bottom surface of the output plate.

[0008] Furthermore, a control valve for controlling the flow of materials is installed on each of the feed pipe, steam output pipe, and material output pipe.

[0009] Furthermore, a level gauge for detecting the liquid level is installed inside the main body of the evaporator.

[0010] Furthermore, the evaporator body is equipped with a temperature monitoring device for detecting the liquid temperature.

[0011] Furthermore, the constant temperature electric heater adopts a grid-shaped PTC electric heating plate structure.

[0012] Furthermore, the outer side of the evaporator body is provided with a heat insulation layer to prevent burns, and the heat insulation layer is a polyurethane heat insulation layer structure.

[0013] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: The distillation reaction device for preparing liquid bis(fluorosulfonyl)imide lithium improves the existing technology in actual use, where the liquid only evaporates on the surface when it does not boil during heating, and the evaporation efficiency is limited by the surface area of ​​the liquid. By spraying, the surface area of ​​liquid evaporation is greatly increased, the evaporation efficiency is improved, and the overall working efficiency of the equipment and production line is improved. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] In the diagram: 1. Evaporator body; 2. Feed pipe; 3. Steam output pipe; 4. Temperature detector; 5. Material output pipe; 6. Constant temperature electric heater; 7. Liquid pump; 8. Liquid pump output pipe; 9. Output plate; 10. Liquid output port. Detailed Implementation

[0016] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0017] refer to Figure 1 This embodiment provides a distillation reaction apparatus for preparing liquid bis(fluorosulfonyl)imide lithium. Its structure includes an evaporator body 1, a feed pipe 2, a steam output pipe 3, a temperature detector 4, a material output pipe 5, a constant-temperature electric heater 6, a liquid pump 7, a liquid pump output pipe 8, an output plate 9, and liquid output ports 10. The top of the evaporator body 1 has 1-3 feed pipes 2. The top of the evaporator body 1 also has a steam output pipe 3, with a temperature detector 4 mounted on the steam output pipe 3. The bottom of the evaporator body 1 has a material output pipe 5. The bottom of the evaporator body 1 has a constant-temperature electric heater 6. The liquid pump 7 is located at a lower position inside the evaporator body 1. The output end of the liquid pump 7 is connected to the liquid pump output pipe 8. The upper end of the liquid pump output pipe 8 is connected to the output plate 9. The bottom surface of the output plate 9 has multiple liquid output ports 10.

[0018] Each of the feed pipe 2, steam output pipe 3, and material output pipe 5 is equipped with a control valve for controlling the flow of materials.

[0019] The evaporator body 1 is equipped with a level gauge for detecting the liquid level.

[0020] The evaporator body 1 is equipped with a temperature monitoring device for detecting the liquid temperature.

[0021] The constant temperature electric heater 6 adopts a grid-shaped PTC electric heating plate structure.

[0022] The outer side of the evaporator body 1 is provided with a heat insulation layer to prevent burns, and the heat insulation layer is a polyurethane heat insulation layer structure.

[0023] This distillation reaction apparatus for preparing liquid bis(fluorosulfonyl)imide lithium improves upon existing technologies where, in practical use, the liquid only evaporates on the surface without boiling during heating, and the evaporation efficiency is limited by the surface area of ​​the liquid. By using a spraying method, the surface area for liquid evaporation is greatly increased, thereby improving the evaporation efficiency and the overall working efficiency of the equipment and production line.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A distillation reaction apparatus for the production of liquid lithium bisfluorosulfonylimide, characterized by: The structure comprises an evaporation tank body, a feeding pipe, a steam output pipe, a temperature detector, a material output pipe, a constant temperature electric heater, a liquid pump, a liquid pump output pipe, an output disc and a liquid output port. The top of the evaporation tank body is provided with 1-3 feeding pipes. The top of the evaporation tank body is also provided with a steam output pipe. The steam output pipe is provided with a temperature detector. The bottom of the evaporation tank body is provided with a material output pipe. The bottom of the inside of the evaporation tank body is provided with a constant temperature electric heater. The lower position of the inside of the evaporation tank body is provided with a liquid pump. The output end of the liquid pump is connected with the liquid pump output pipe. The upper end of the liquid pump output pipe is connected with the output disc. The bottom surface of the output disc is provided with a plurality of liquid output ports.

2. A distillation reaction apparatus for producing liquid lithium bisfluorosulfonylimide according to claim 1, characterized by: The feeding pipe, the steam output pipe and the material output pipe are each provided with a control valve for controlling the flow of materials.

3. The distillation reaction apparatus for producing liquid lithium bisfluorosulfonylimide according to claim 1, characterized by: The inside of the evaporation tank body is provided with a liquid level meter for detecting the liquid level.

4. The distillation reaction apparatus for producing liquid lithium bisfluorosulfonylimide according to claim 1, characterized by: The inside of the evaporation tank body is provided with a temperature monitoring device for detecting the temperature of the liquid.

5. The distillation reaction apparatus for producing liquid lithium bisfluorosulfonylimide according to claim 1, characterized by: The constant temperature electric heater adopts a grid-shaped PTC electric heating plate structure.

6. A distillation reaction apparatus for the production of liquid lithium bisfluorosulfonylimide according to claim 1, characterized by: The outside of the evaporation tank body is provided with a heat insulation layer for avoiding scalding. The heat insulation layer is a polyurethane heat insulation layer structure.

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