阅读说明：本技术 一种微通道反应器制备双氟磺酰亚胺的方法 (Method for preparing bis (fluorosulfonyl) imide by using microchannel reactor ) 是由 周峰 顾培洋 刘海丰 王安山 于 2021-03-19 设计创作，主要内容包括：本发明公开了一种微通道反应器制备双氟磺酰亚胺的方法,包括以下操作步骤：S1：材料的准备：准备一定量的氨气、有机溶剂、铵盐、有机碱缚酸剂、硫酰氟气体、碱、酸,准备柱塞泵、气体流量计、微混合器、碳化硅微通道反应器、精馏装置等；S2：配制反应液：所述氨气通入有机溶剂或者铵盐溶解于有机溶剂中,并加入有机碱缚酸剂配制成溶液；S3：气液混合：所述S2步骤中得到的溶液与硫酰氟气体分别经过柱塞泵及气体流量计加入到微混合器内。本发明所述的一种微通道反应器制备双氟磺酰亚胺的方法,通过成熟的碳化硅微通道反应器来实现,安全、反应时间短、工艺稳定可靠、操作简单,同时不存在设备腐蚀问题,带来更好的应用前景。(The invention discloses a method for preparing bis (fluorosulfonyl) imide by a microchannel reactor, which comprises the following operation steps: s1: preparation of materials: preparing a certain amount of ammonia gas, an organic solvent, ammonium salt, an organic alkali acid-binding agent, sulfuryl fluoride gas, alkali and acid, and preparing a plunger pump, a gas flowmeter, a micro mixer, a silicon carbide micro-channel reactor, a rectifying device and the like; s2: preparing a reaction solution: introducing the ammonia gas into an organic solvent or dissolving ammonium salt in the organic solvent, and adding an organic alkali acid-binding agent to prepare a solution; s3: gas-liquid mixing: and adding the solution obtained in the step S2 and sulfuryl fluoride gas into a micro mixer through a plunger pump and a gas flowmeter respectively. The method for preparing the bis-fluorosulfonyl imide by the microchannel reactor is realized by a mature silicon carbide microchannel reactor, is safe, short in reaction time, stable and reliable in process and simple to operate, does not have the problem of equipment corrosion, and brings better application prospect.)

1. A method for preparing bis (fluorosulfonyl) imide by a microchannel reactor is characterized by comprising the following steps: the method comprises the following operation steps:

s1: preparation of materials: preparing a certain amount of ammonia gas, an organic solvent, ammonium salt, an organic alkali acid-binding agent, sulfuryl fluoride gas, alkali and acid, and preparing a plunger pump, a gas flowmeter, a micro mixer, a silicon carbide micro-channel reactor, a rectifying device and the like;

s2: preparing a reaction solution: introducing the ammonia gas into an organic solvent or dissolving ammonium salt in the organic solvent, and adding an organic alkali acid-binding agent to prepare a solution;

s3: gas-liquid mixing: the solution obtained in the step S2 and sulfuryl fluoride gas are respectively added into a micro mixer through a plunger pump and a gas flowmeter to complete the mixing of gas and liquid phases;

s4: concentration and neutralization: the mixed solution in the step S3 completely reacts in the silicon carbide microchannel reactor module, after the reaction solution is discharged, firstly adding alkali, filtering out fluoride salt, concentrating the filtrate to recover solvent and amine, and adding acid into the concentrated solution for neutralization;

s5: and (3) rectification under reduced pressure: and (8) obtaining a concentrated solution in the step S4, and then carrying out vacuum rectification on the concentrated solution to obtain the bis (fluorosulfonyl) imide, namely the preparation is completed.

2. The method for preparing the bis-fluorosulfonyl imide by using the microchannel reactor, according to claim 1, wherein: the organic solvent in the step S1 is one or a mixture of methanol, ethanol, propanol, isopropanol, acetonitrile, DMF, acetone, butanone, tetrahydrofuran and 1, 4-dioxane.

3. The method for preparing the bis-fluorosulfonyl imide by using the microchannel reactor, according to claim 1, wherein: the amine salt in the step 1 of S1 is ammonia gas, ammonia gas solution, ammonium halide and ammonium carboxylate of C1-C4.

4. The method for preparing the bis-fluorosulfonyl imide by using the microchannel reactor, according to claim 1, wherein: the organic base acid-binding agent in the step S1 is common organic tertiary amine or a nitrogen-containing aromatic heterocyclic compound, such as trimethylamine, triethylamine, tri-N-propylamine, tri-N-butylamine, diisopropylethylamine, N-tetramethylpropylenediamine, pyridine, and the like.

5. The method for preparing the bis-fluorosulfonyl imide by using the microchannel reactor, according to claim 1, wherein: the mol ratio of the ammonia gas/ammonium salt to the acid-binding agent in the step S2 is 1: 2-1: 4, the optimal ratio is 1:2.1, and the mass ratio of the ammonia gas/ammonium salt to the organic solvent is 1: 50-1: 10.

6. The method for preparing the bis-fluorosulfonyl imide by using the microchannel reactor, according to claim 1, wherein: the flow rate of the pre-prepared feed liquid in the step S3 is 2-8 mL/min, the flow rate of the sulfuryl fluoride gas is 2-6L/min, the molar ratio of the ammonia gas/ammonium salt to the sulfuryl fluoride is 1: 2-1: 4, and the optimal ratio is 1: 2.1.

7. The method for preparing the bis-fluorosulfonyl imide by using the microchannel reactor, according to claim 1, wherein: the diameter of a channel of a microchannel in the microchannel module in the step S4 is 1.5-2.0 mm, the liquid holdup of a single module is 10mL, the reaction flux is 1-30L/h, the number of the microchannel modules is 2-8, the temperature of the microchannel module is controlled at 10-80 ℃, the flow rate of reaction materials is controlled at 2-8 mL/min, the reaction temperature of the microchannel module is controlled at 50-60 ℃ for ammonium salt, the reaction temperature of the microchannel module is controlled at 20-30 ℃ for ammonia gas, the number of the microchannel modules is 4-6, the reaction flow rate of the microchannel module is controlled at 6-8 mL/min, and the residence time of the mixed liquid in the microchannel module is 4-10 min, preferably 5-7 min.

8. The method for preparing the bis-fluorosulfonyl imide by using the microchannel reactor, according to claim 1, wherein: and distilling under reduced pressure in the step S5 to obtain the bis (fluorosulfonyl) imide, wherein the distillation pressure, namely the gauge pressure, is 500-2000 Pa, the optimal gauge pressure is 600Pa, and collecting fractions at 80 ℃.

Technical Field

The invention relates to the field of fine chemical products, in particular to a method for preparing bis (fluorosulfonyl) imide by using a microchannel reactor.

Background

Bis-fluorosulfonylimide (HFSI), formula (FSO2)2NH, melting point 17 ℃, boiling point 170 ℃, is a raw material for preparing lithium bis-fluorosulfonylimide (LIFSI) as an electrolyte of a lithium secondary battery, the LIFSI has a very weak force with lithium ions due to its bulky anion structure and strong electronegativity of sulfonyl and fluoride ions, so that the lithium ions have high freeness and excellent conductivity when being in a molten state or being dissolved in an organic solvent, and can be used for electrolytes, supercapacitors, ionic liquid catalysts and the like of the lithium secondary battery, and have very important industrial and commercial application prospects and values, along with higher and higher national requirements and supervision measures on chemical safety, in the field of chemical engineering, research of modifying a traditional process route in a microchannel continuous flow mode is more and more increasing, and a microchannel continuous flow reactor causes an overcurrent medium in a microchannel due to its very high specific surface area (the specific surface area is more than that of a traditional tank reactor 103) Compared with the conventional kettle type reactor, the mass heat transfer efficiency and the mass transfer efficiency are greatly improved, the reactor is particularly suitable for reactions with huge heat effects, the reactions can be enhanced by heating, pressurizing, enhancing mixing and other modes, the reactions can be completed in a short time, and meanwhile, the continuity, the intelligence and the intrinsic safety of the process flow can be easily realized, so that the reactor is widely concerned by people.

The existing methods for preparing bis (fluorosulfonyl) imide have certain disadvantages when in use, for example, in patents CN 102046523, CN 106044728, CN 111483986, CN 110217763, CN 112320772 and CN 110155967, it is reported that sulfamic acid (chlorosulfonic acid isocyanate), chlorosulfonic acid and a chlorinating agent are used as starting materials, bis (chlorosulfonyl) imide is synthesized first under the action of a catalyst, and then fluorine and chlorine exchange is performed under the action of the catalyst to prepare bis (fluorosulfonyl) imide, although the used raw materials are very cheap and easily available, the method also has many problems of long process route, low yield, amplification of three wastes, high production safety risk, serious corrosion of equipment and the like, and is not suitable for being used as a green and safe production route, in patents CN 104495767 and CN 111099566, sulfuryl chloride and ammonia or inorganic ammonium salt are used as starting materials, bis (chlorosulfonyl) imide is synthesized first, and then fluorine and chlorine exchange is performed under the action of the catalyst, the prepared bis-fluorosulfonyl imide has the similar problems as the above, and in addition, the sulfuryl chloride has high activity, the reaction is difficult to control and does not generate oligomerization, which is not beneficial to the use of people.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a method for preparing bis (fluorosulfonyl) imide by using a microchannel reactor, which is realized by using a mature silicon carbide microchannel reactor.

(II) technical scheme

In order to achieve the purpose, the invention adopts the technical scheme that: a method for preparing bis (fluorosulfonyl) imide by a microchannel reactor comprises the following operation steps:

s1: preparation of materials: preparing a certain amount of ammonia gas, an organic solvent, ammonium salt, an organic alkali acid-binding agent, sulfuryl fluoride gas, alkali and acid, and preparing a plunger pump, a gas flowmeter, a micro mixer, a silicon carbide micro-channel reactor, a rectifying device and the like;

s2: preparing a reaction solution: introducing the ammonia gas into an organic solvent or dissolving ammonium salt in the organic solvent, and adding an organic alkali acid-binding agent to prepare a solution;

s3: gas-liquid mixing: the solution obtained in the step S2 and sulfuryl fluoride gas are respectively added into a micro mixer through a plunger pump and a gas flowmeter to complete the mixing of gas and liquid phases;

s4: concentration and neutralization: the mixed solution in the step S3 completely reacts in the silicon carbide microchannel reactor module, after the reaction solution is discharged, firstly adding alkali, filtering out fluoride salt, concentrating the filtrate to recover solvent and amine, and adding acid into the concentrated solution for neutralization;

s5: and (3) rectification under reduced pressure: and (8) obtaining a concentrated solution in the step S4, and then carrying out vacuum rectification on the concentrated solution to obtain the bis (fluorosulfonyl) imide, namely the preparation is completed.

As a preferable technical scheme, the organic solvent in the step S1 is one or a mixture of methanol, ethanol, propanol, isopropanol, acetonitrile, DMF, acetone, butanone, tetrahydrofuran and 1, 4-dioxane.

As a preferable technical scheme, the amine salt in the step 1 of S1 is ammonia gas and ammonia gas solution, ammonium halide and ammonium carboxylate of C1-C4.

As a preferable technical scheme, the organic base acid-binding agent in the step S1 is a common organic tertiary amine or a nitrogen-containing aromatic heterocyclic compound, such as trimethylamine, triethylamine, tri-N-propylamine, tri-N-butylamine, diisopropylethylamine, N-tetramethylpropylenediamine, pyridine, and the like.

As a preferable technical scheme, the molar ratio of the ammonia gas/ammonium salt to the acid-binding agent in the step S2 is 1: 2-1: 4, the optimal ratio is 1:2.1, and the mass ratio of the ammonia gas/ammonium salt to the organic solvent is 1: 50-1: 10.

As a preferable technical scheme, the flow rate of the pre-prepared feed liquid in the step S3 is 2-8 mL/min, the flow rate of the sulfuryl fluoride gas is 2-6L/min, the molar ratio of the ammonia gas/ammonium salt to the sulfuryl fluoride is 1: 2-1: 4, and the optimal ratio is 1: 2.1.

As a preferable technical scheme, in the step S4, the diameter of a channel of a microchannel in a microchannel module is 1.5-2.0 mm, the liquid holdup of a single module is 10mL, the reaction flux is 1-30L/h, the number of the microchannel modules is 2-8, the temperature of the microchannel module is controlled at 10-80 ℃, the flow rate of a reaction material is controlled at 2-8 mL/min, the reaction temperature of the microchannel module is controlled at 50-60 ℃ for ammonium salt, the reaction temperature of the microchannel module is controlled at 20-30 ℃ for ammonia gas, the number of the microchannel modules is 4-6, the reaction flow rate of the microchannel module is controlled at 6-8 mL/min, and the residence time of a mixed solution in the microchannel module is 4-10 min, and the optimal residence time is 5-7 min.

In a preferable technical scheme, the bis-fluorosulfonyl imide is obtained by reduced pressure distillation in the step S5, the distillation pressure, i.e., gauge pressure, is 500 to 2000Pa, and most preferably 600Pa, and the fraction is collected at 80 ℃.

(III) advantageous effects

Compared with the prior art, the invention provides a method for preparing bis (fluorosulfonyl) imide by using a microchannel reactor, which has the following beneficial effects: the method for preparing the bis-fluorosulfonyl imide by the microchannel reactor is realized by a mature silicon carbide microchannel reactor, is safe, short in reaction time, stable and reliable in process and simple to operate, does not have the problem of equipment corrosion, ammonia gas is introduced into an organic solvent or ammonium salt is dissolved in the organic solvent, an organic alkali acid-binding agent is added to prepare a solution, the obtained solution and sulfuryl fluoride gas are respectively added into a micromixer through a plunger pump and a gas flowmeter to complete the mixing of gas and liquid phases, the mixed solution is completely reacted in a silicon carbide microchannel reactor module, after the reaction liquid is discharged, alkali is added firstly, fluoride salt is filtered out, the filtrate is concentrated to recover the solvent and the amine, the concentrated solution is added with acid for neutralization to obtain a concentrated solution, and the concentrated solution is subjected to reduced pressure rectification to obtain the bis-fluorosulfonyl imide, namely the preparation is completed, the whole structure for preparing the bis-fluorosulfonyl imide is simple, convenient operation, the effect of using is better than traditional mode.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a method for preparing bis (fluorosulfonyl) imide by using a microchannel reactor.

FIG. 2 is a schematic structural diagram of a data table of an embodiment of a method for preparing bis (fluorosulfonyl) imide by using a microchannel reactor according to the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-2, a method for preparing bis-fluorosulfonyl imide by using a microchannel reactor comprises the following steps:

s1: preparation of materials: preparing a certain amount of ammonia gas, an organic solvent, ammonium salt, an organic alkali acid-binding agent, sulfuryl fluoride gas, alkali and acid, and preparing a plunger pump, a gas flowmeter, a micro mixer, a silicon carbide micro-channel reactor, a rectifying device and the like;

s2: preparing a reaction solution: introducing the ammonia gas into an organic solvent or dissolving ammonium salt in the organic solvent, and adding an organic alkali acid-binding agent to prepare a solution;

s3: gas-liquid mixing: the solution obtained in the step S2 and sulfuryl fluoride gas are respectively added into a micro mixer through a plunger pump and a gas flowmeter to complete the mixing of gas and liquid phases;

s4: concentration and neutralization: the mixed solution in the step S3 completely reacts in the silicon carbide microchannel reactor module, after the reaction solution is discharged, firstly adding alkali, filtering out fluoride salt, concentrating the filtrate to recover solvent and amine, and adding acid into the concentrated solution for neutralization;

s5: and (3) rectification under reduced pressure: and (8) obtaining a concentrated solution in the step S4, and then carrying out vacuum rectification on the concentrated solution to obtain the bis (fluorosulfonyl) imide, namely the preparation is completed.

Further, the organic solvent in the step S1 is one or a mixture of methanol, ethanol, propanol, isopropanol, acetonitrile, DMF, acetone, butanone, tetrahydrofuran, and 1, 4-dioxane.

Further, the amine salt in step 1 of S1 is ammonia gas and ammonia solution, ammonium halide and ammonium carboxylate of C1-C4.

Further, the organic base acid-binding agent in the step S1 is a common organic tertiary amine or a nitrogen-containing aromatic heterocyclic compound, such as trimethylamine, triethylamine, tri-N-propylamine, tri-N-butylamine, diisopropylethylamine, N-tetramethylpropylenediamine, pyridine, and the like.

Further, the molar ratio of the ammonia gas/ammonium salt to the acid-binding agent in the step S2 is 1: 2-1: 4, the optimal ratio is 1:2.1, and the mass ratio of the ammonia gas/ammonium salt to the organic solvent is 1: 50-1: 10.

Further, the flow rate of the pre-prepared feed liquid in the step S3 is 2-8 mL/min, the flow rate of the sulfuryl fluoride gas is 2-6L/min, the molar ratio of the ammonia gas/ammonium salt to the sulfuryl fluoride is 1: 2-1: 4, and the optimal ratio is 1: 2.1.

Further, in the step S4, the diameter of a channel of a microchannel in the microchannel module is 1.5-2.0 mm, the liquid holdup of a single module is 10mL, the reaction flux is 1-30L/h, the number of the microchannel modules is 2-8, the temperature of the microchannel module is controlled at 10-80 ℃, the flow rate of reaction materials is controlled at 2-8 mL/min, for ammonium salts, the reaction temperature of the microchannel module is controlled at 50-60 ℃, for ammonia gas, the reaction temperature of the microchannel module is controlled at 20-30 ℃, the number of the microchannel modules is 4-6, the reaction flow rate of the microchannel module is controlled at 6-8 mL/min, and the residence time of the mixed liquid in the microchannel module is 4-10 min, preferably 5-7 min.

Further, in the step S5, the bis-fluorosulfonyl imide is obtained by reduced pressure distillation, wherein the distillation pressure, namely the gauge pressure, is 500-2000 Pa, and the distillation pressure is 600Pa, and the fraction is collected at 80 ℃.

Example 1:

adding ammonium fluoride (converted according to purity), triethylamine (containing less than 500ppm) and methanol (containing less than 500ppm) into a liquid storage bottle according to the mass ratio of 1:5.465:19, and standing for later use after the ammonium fluoride is completely dissolved;

setting the temperature of the high-temperature and low-temperature machine to be 40 ℃, and adding methanol, triethylamine solution and sulfuryl fluoride gas with the mass concentration of 3.93% into the mixer through a plunger pump and a gas flowmeter respectively, wherein the flow rate of the methanol and triethylamine solution with the mass concentration of 3.93% is 8mL/min, the flow rate of the sulfuryl fluoride gas is 318mL/min, and the mass concentration of the reaction material sulfuryl fluoride: triethylamine: the mass molar ratio of ammonium fluoride is 2.1:2: 1;

injecting the mixed liquid in the premixer into a microchannel of a microchannel module for reaction, wherein the number of the microchannel reaction modules is 3, the liquid holdup is 30mL, the reaction materials stay in the microchannel for 3.75min, after the flow rate and the reaction are stable, sampling from a sampling valve 13, detecting the content of fluorine ions by using an ion chromatography method, and calculating the conversion rate of sulfuryl fluoride to be 89.3%;

fourthly, after the reaction is stable, receiving feed liquid after the reaction in a 10min micro-channel for post-treatment, sequentially carrying out alkali neutralization, filtering to remove sodium fluoride, evaporating out solvent methanol and free triethylamine, dropwise adding sulfuric acid into residual liquid, adjusting the pH value to 1.2, carrying out reduced pressure distillation, collecting a product, and drying the product through anhydrous sodium sulfate to obtain 9.91g of colorless liquid, wherein the water content is 0.11%, and the molar yield is 80.87%.

Example 2:

different from the embodiment 1, the microchannel reaction module is 4, the liquid holdup is 40mL, the reaction material stays in the microchannel for 5min, 10.72g of colorless liquid is obtained, the water content is 0.15%, and the molar yield is 87.45%.

Example 3:

different from the example 1, the microchannel reaction module is 5, the liquid holdup is 50mL, the reaction material stays in the microchannel for 6.25min, 10.38g of colorless liquid is obtained, the water content is 0.14%, and the molar yield is 84.69%.

Example 4:

in contrast to example 3, the reaction temperature was controlled to 50 ℃ to obtain 11.03g of a colorless liquid, which had a water content of 0.20% and a molar yield of 89.91%.

Example 5:

in contrast to example 3, the reaction temperature was controlled at 60 ℃ to obtain 11.5g of a colorless liquid having a water content of 0.14% and a molar yield of 93.82%.

Example 6:

unlike example 5, the flow rate of a 3.93% ammonium fluoride solution in methanol and triethylamine was 4mL/min, and the reaction retention time was 12.5min, whereby 11.57g of a colorless liquid was obtained, the water content was 0.19%, and the molar yield was 94.35%.

Example 7:

unlike example 5, the flow rate of a 3.93% solution of ammonium fluoride in methanol and triethylamine was 6mL/min, and the reaction retention time was 8.33min, whereby 11.4g of a colorless liquid was obtained, the water content was 0.17%, and the molar yield was 92.86%.

Example 8:

adding triethylamine (containing less than 500ppm of water) and methanol (containing less than 500ppm of water) into a liquid storage bottle according to the mass ratio of 1:11.9:38, then blowing ammonia gas into the solution (controlling the amount of the introduced ammonia gas by a weighing method), and sealing and standing for later use;

setting the temperature of the high-low temperature machine to be 20 ℃, and adding methanol of ammonia gas with the mass concentration of 1.96%, triethylamine solution and sulfuryl fluoride gas into the mixer through a plunger pump and a gas flowmeter respectively, wherein the flow rate of the methanol of ammonium fluoride with the mass concentration of 1.96% and the flow rate of the triethylamine solution are 8mL/min, the flow rate of the sulfuryl fluoride gas is 346mL/min, and the mass ratio of the reaction material sulfuryl fluoride: triethylamine: the mass molar ratio of ammonia gas to ammonia gas is 2.1:2: 1;

thirdly, injecting the mixed liquid in the premixer into a microchannel of a microchannel module for reaction, wherein the number of the microchannel reaction module is 5, the liquid holdup is 50mL, the reaction material stays in the microchannel for 6.25min, after the flow rate and the reaction are stable, sampling from a sampling valve 13, detecting the content of fluorine ions by using an ion chromatography method, and calculating the conversion rate of sulfuryl fluoride to be 97.8%;

fourthly, after the reaction is stable, receiving feed liquid after the reaction in a 10-min micro-channel for post-treatment, sequentially carrying out alkali neutralization and filtration to remove sodium fluoride, evaporating out a solvent methanol and free triethylamine, dropwise adding sulfuric acid into residual liquid, adjusting the pH value to 1.2, carrying out reduced pressure distillation, collecting a product, and drying the product through anhydrous sodium sulfate to obtain 10.32g of colorless liquid, wherein the water content is 0.11%, and the molar yield is 77.33%.

Example 9:

in contrast to example 7, the reaction temperature was controlled at 30 ℃ to obtain 9g of a colorless liquid having a water content of 0.21% and a molar yield of 67.38%.

Example 10:

respectively adding ammonium acetate (converted according to purity), triethylamine (containing less than 500ppm) and methanol (containing less than 500ppm) into a liquid storage bottle according to the mass ratio of 1:2.62:9, and standing for later use after the ammonium acetate is completely dissolved;

setting the temperature of the high-temperature and low-temperature machine to be 60 ℃, and adding methanol, triethylamine solution and sulfuryl fluoride gas with mass concentration of 7.92% into the mixer through a plunger pump and a gas flowmeter respectively, wherein the flow rate of the methanol and triethylamine solution of the 7.92% ammonium acetate is 8mL/min, the flow rate of the sulfuryl fluoride gas is 321mL/min, and the reaction material sulfuryl fluoride: triethylamine: the material molar ratio of ammonium acetate is 2.1:2: 1;

injecting the mixed liquid in the premixer into a microchannel of a microchannel module for reaction, wherein the number of the microchannel reaction module is 5, the liquid holdup is 50mL, the reaction material stays in the microchannel for 6.25min, after the flow rate and the reaction are stable, sampling from a sampling valve 13, detecting the content of fluorine ions by using an ion chromatography method, and calculating the conversion rate of sulfuryl fluoride to be 96.9%;

fourthly, after the reaction is stable, receiving feed liquid after the reaction in a 10min micro-channel for post-treatment, sequentially carrying out alkali neutralization and filtration to remove sodium fluoride, evaporating out a solvent methanol and free triethylamine, dropwise adding sulfuric acid into residual liquid, adjusting the pH value to 1.2, carrying out reduced pressure distillation, collecting a product, and drying the product through anhydrous sodium sulfate to obtain 11.37g of colorless liquid, wherein the water content is 0.12 percent, and the molar yield is 90.78 percent.

Comparative example 1:

adding 9g of ammonium fluoride, 49.2g of triethylamine and 170g of methanol into a 500mL reaction bottle, sealing, pumping negative pressure to 0.08MPa (gauge pressure), starting stirring, slowly introducing sulfuryl fluoride gas into the reaction bottle, controlling the temperature in the reaction bottle to be 40 ℃, continuously introducing sulfuryl fluoride until the pressure in the bottle is close to the normal pressure and does not change, continuously carrying out heat preservation reaction for 10 hours, carrying out the whole reaction for 16 hours, consuming 55g of sulfuryl fluoride gas to obtain pale yellow liquid, sequentially carrying out alkali neutralization and filtration to remove sodium fluoride, evaporating solvent methanol and free triethylamine, dropwise adding sulfuric acid into residual liquid, adjusting the pH value to 1.2, carrying out reduced pressure distillation, collecting a product, and drying the product by anhydrous sodium sulfate to obtain 40.68g of colorless liquid, wherein the water content is 0.22%, and the molar yield is 92.13%.

The working principle is as follows: introducing ammonia gas into an organic solvent or dissolving ammonium salt in the organic solvent, adding an organic alkali acid-binding agent to prepare a solution, adding the obtained solution and sulfuryl fluoride gas into a micro mixer through a plunger pump and a gas flowmeter respectively to complete the mixing of gas and liquid phases, allowing the mixed solution to completely react in a silicon carbide micro-channel reactor module, discharging the reaction solution, firstly adding alkali, filtering out fluoride salt, concentrating the filtrate to recover solvent and amine, adding acid into the concentrated solution to neutralize to obtain concentrated solution, then carrying out reduced pressure rectification on the concentrated solution to obtain the bis (fluorosulfonyl) imide, the device connected with the microchannel reactor also comprises a feed liquid receiving tank, a first neutralization kettle, a filter, a first evaporator liquid storage tank, a first evaporator, a second neutralization kettle, a second evaporator liquid storage tank and a second evaporator; the device comprises a micro-channel reactor, a feed liquid receiving tank, a first neutralization kettle, a first evaporator liquid storage tank, a first filter inlet pipe, a first filter outlet pipe, a first circulating pump, a first filter outlet pipe, a first filter inlet pipe, a first filter outlet pipe, a first evaporator liquid storage tank, a first material inlet pipe, a first material outlet pipe, a second; the first evaporator liquid storage tank is connected with the first evaporator through a liquid conveying pipeline provided with a material transferring centrifugal pump, evaporation is carried out, the top of the first evaporator liquid storage tank is provided with a condensing system and a receiving storage tank, a discharge pipe at the bottom of the first evaporator is connected with the second neutralizing kettle, and the middle of the first evaporator liquid storage tank is provided with the material transferring centrifugal pump; the neutralization kettle is connected to a second evaporator liquid storage tank through a liquid conveying pipeline connected with a discharge valve at the bottom; the second evaporator liquid storage tank is connected with the second evaporator through a liquid conveying pipeline provided with a material transferring centrifugal pump, a condensing system and a product receiving storage tank are arranged at the top of the second evaporator, and a discharge pipe at the discharge end of the micro-channel module is provided with a sampling valve for sampling central control analysis, wherein the processing comprises neutralization, filtration, evaporation, re-neutralization and re-evaporation; the treatment specifically comprises the following steps: transferring the reaction liquid into a neutralization kettle, dropwise adding 32% alkali, and adjusting the pH to 10-11, preferably 10.7, namely completely dissociating the amine; separating out the generated fluoride salt from the solution, using a bag filter, beating the feed liquid to circularly remove the fluoride salt of the system, concentrating the obtained filtrate by an evaporator to recover the solvent and the acid-binding agent, and rectifying and separating the recovered solvent and the acid-binding agent to respectively recover and reuse; transferring the distilled residual liquid to a second neutralization kettle, adjusting the pH value to 1-2 by sulfuric acid, feeding the obtained feed liquid into a second evaporator, and distilling to obtain the bis (fluorosulfonyl) imide.

It is noted that, herein, relational terms such as first and second (a, b, etc.) and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.