CN117185934A - Preparation method of difluoro sulfonimide organic ammonium salt - Google Patents

Preparation method of difluoro sulfonimide organic ammonium salt Download PDF

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CN117185934A
CN117185934A CN202311136301.2A CN202311136301A CN117185934A CN 117185934 A CN117185934 A CN 117185934A CN 202311136301 A CN202311136301 A CN 202311136301A CN 117185934 A CN117185934 A CN 117185934A
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ammonium salt
difluoro
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张先满
崔毅鑫
徐鹏飞
马帅
张涛
袁少岚
王超
陈寅镐
徐建国
戴国桥
缪永奕
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Fujian Zhongxin Fluorine Material Gaobao Technology Co ltd
Zhejiang Zhongxin Fluorine Materials Co ltd
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Fujian Zhongxin Fluorine Material Gaobao Technology Co ltd
Zhejiang Zhongxin Fluorine Materials Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
    • C01B21/087—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms
    • C01B21/093—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms containing also one or more sulfur atoms
    • C01B21/096—Amidosulfonic acid; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
    • C01B21/086—Compounds containing nitrogen and non-metals and optionally metals containing one or more sulfur atoms
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
    • C01P2002/86—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by NMR- or ESR-data
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

The invention discloses a preparation method of difluoro sulfimide organic ammonium salt, which belongs to the technical field of chemical synthesis and is characterized by comprising the following steps: taking sulfuryl fluoride and ammonium salt as reaction raw materials, and obtaining difluoro sulfimide organic ammonium salt under the action of an aprotic polar solvent and an organic alkaline acid binding agent; the invention provides a preparation method of difluoro sulfonimide organic salt, which has the advantages of few reaction steps, high yield, avoidance of fluorination reaction steps under high temperature and high pressure conditions, no use of high-risk toxic gas materials such as hydrogen fluoride, fluorine gas and the like, high reaction safety, easy operation and low equipment requirements, and is suitable for industrial production.

Description

Preparation method of difluoro sulfonimide organic ammonium salt
Technical Field
The invention relates to a preparation method of difluoro sulfimide organic ammonium salt, belonging to the technical field of chemical synthesis.
Background
In recent years, with the strong support of the new energy automobile industry by the state, the rapid development of the new energy electric automobile (ElectricVehicle, EV) industry, energy storage industry and the like is promoted, and the requirements on the energy density, the cycle life, the safety, the environmental protection and the like of the lithium ion battery of the key core technology of the new energy are continuously improved. In order to ensure healthy development of new energy markets, development of high performance, high safety and environmental protection, and production of lithium ion battery industry technology at a reasonable cost are urgently required. Considering the comprehensive properties of lithium ion battery production cost, electrochemistry, safety, environmental protection and the like, lithium hexafluorophosphate (Lithium hexafluorophosphate, liPF) 6 ) Is the electrolyte which is most widely used in the lithium ion battery which is already industrialized at present, plays a role in transporting charges and is one of key factors for determining the performance of the battery, but LiPF 6 Has the natural defects of poor heat and chemical stability, safety, low-temperature cycle efficiency and the like which cannot be overcome, such as about 60 ℃ LiPF 6 The decomposition starts, and if the process is further met with a trace amount of water, the electrolyte degradation is further accelerated. Accompanied by LiPF 6 The degradation process can also generate highly corrosive Hydrogen Fluoride (HF) gas, so that the chemical structure of the electrolyte can be damaged to reduce the concentration of the electrolyte, meanwhile, the chemical structure of the electrolyte and the electrode can be changed, the reversible cycle working condition of the battery is damaged, the capacity of the battery is quickly attenuated, and great challenges and potential safety hazards are brought to practical production and application. Therefore, the development of the high-quality electrolyte which is safer, more efficient and applicable to severe conditions such as low temperature, high temperature and the like is a most economical and effective way for improving the comprehensive performance of various ion batteries and expanding the application range of the ion batteries. Conductivity, heat resistance stability, water resistance stability, low temperature cycle efficiency and other comprehensive electrochemical properties of lithium bis (fluorosulfonyl) imide (Lithium bisfluorosulfonylimide, liSSI) and other metal bis (fluorosulfonyl) imide salts are better than those of corresponding hexafluorophosphate (MPF) 6 ) Is more excellent. The alkali metal salt of the difluoro-sulfonyl imide is known by the domestic and foreign industry to be the next generation novel ion battery electrolyte for replacing the corresponding hexafluorophosphate electrolyteThe ideal electrolyte with the most industrialization prospect becomes the core competitiveness of new energy lithium battery enterprises.
The preparation of lithium bis (fluorosulfonyl) imide and other metal salts is first carried out by synthesizing bis (fluorosulfonyl) imide; initially in the laboratory, the bis-fluorosulfonyl imide is prepared by synthesizing sulfamic acid and phosphorus pentachloride as raw materials through a multi-step reaction (j.k.ruff, et al, inorg.Synth.1968,11,138;J.M.Shreeve,et al, inorg.chem.1998,37,6295.), but the reaction process is complicated in route, various in intermediate product types, difficult in product purification, high in production difficulty and high in production cost, and restricts commercial use thereof. In recent years, as the technology for producing the bisfluorosulfonyl imide breaks through and the production cost is continuously reduced, the bisfluorosulfonyl imide has the conditions of industrial production and large-scale commercial application. The existing industrialized synthesis routes of the difluoro sulfimide mainly comprise two routes:
(1) Based on the optimization of the traditional synthetic reaction process, chlorosulfonic acid and sulfamic acid or chlorosulfonyl isocyanate are used as raw materials to synthesize a dichloro-sulfonyl-imide (HClSI) intermediate product through reaction, then the difluoro-sulfonyl-imide (HFSI) intermediate product is obtained through fluorination reaction and distillation, and finally LiFSI (for example, CN105731399B, CN106044728B and the like) is obtained through three-step reactions such as lithiation and the like. Compared with the traditional reaction process, the optimized production process reduces the reaction steps and the types of reaction intermediate products, the production difficulty and the production cost are obviously reduced compared with the traditional process, and most chemical enterprises such as polyfluoro poly and other companies adopt the reaction process to produce the lithium bis-fluorosulfonyl imide. However, the fluorination process adopted by the process generally adopts hydrogen fluoride or fluorine gas and other raw materials with extremely strong corrosiveness to react at high temperature and high pressure, the risk of the reaction process is high, and the requirement on production equipment is high. The lithium difluorosulfimide can be obtained by three steps of reaction synthesis, and has the advantages of more reaction steps, complex reaction, difficult purification, low yield, large pollution and higher production cost, so that the comprehensive cost performance of the lithium difluorosulfimide hardly meets the requirements and the expectations of the well-blown development of the lithium ion battery market on the production of lithium difluorosulfimide and other salts with high quality and high productivity.
(2) Directly reacting sulfuryl fluoride and ammonia gas as raw materials to synthesize a difluoro-sulfonyl imide (HFSI) intermediate product, and then carrying out lithiation two-step reaction to synthesize the difluoro-sulfonyl imide lithium (for example, CN 111620315A). Although the synthetic reaction process has high yield and few steps, as the reaction involves two toxic gases to participate in the reaction at the same time, the difficulty of reaction control is high, and only a small part of enterprises are currently developing and adopting the production process, such as potential hazards of safety accidents and the like caused by improper operation. .
Disclosure of Invention
The invention aims to solve part of defects in the current production process of the difluoro sulfonimide salt, and provides a brand new preparation method of the difluoro sulfonimide organic ammonium salt, which has the advantages of good purity of reaction products, high yield, safety, environmental protection and high efficiency. In order to achieve the above purpose, the invention adopts the following technical scheme:
the preparation method of the difluoro sulfimide organic ammonium salt is characterized by comprising the following steps: the difluoro sulfinyl imine organic ammonium salt is obtained by taking sulfuryl fluoride and ammonium salt as reaction raw materials and reacting under the action of an aprotic polar solvent and an organic alkaline acid binding agent.
The synthetic route of the invention is as follows:
the further arrangement is that:
the aprotic solvent is: acetonitrile, acetone, esters such as dimethyl carbonate, diethyl carbonate, ethyl acetate, etc., ethers such as tetrahydrofuran, methyl tert-butyl ether, ethylene glycol dimethyl ether, etc., and acetonitrile is preferred.
The molar ratio of the sulfuryl fluoride, the organic alkaline acid binding agent and the ammonium salt is 1:1-10:0.2-1, and is preferably 1:1.5:0.5.
The organic alkaline acid binding agent is as follows: any one of trimethylamine, triethylamine, N-diisopropylethylamine, tri-N-propylamine, tri-N-butylamine, pyridine and the like, preferably triethylamine.
The ammonium salt is selected from any one of the following ammonium salts: ammonium fluoride, ammonium chloride, ammonium bromide, ammonium bisulfate, ammonium bicarbonate, ammonium bisulfate.
The reaction temperature is 0 to 60 ℃, preferably 10 to 30 ℃.
The organic ammonium salt of the difluoro-sulfonyl imide prepared by the invention can be directly used for preparing the metal salt of the difluoro-sulfonyl imide through further metal exchange reaction without purification, such as sodium difluoro-sulfonyl imide and lithium difluoro-sulfonyl imide.
A preparation method of sodium bis (fluorosulfonyl) imide is characterized in that: the method comprises the steps of taking organic ammonium salt of difluoro-sulfonyl imide as a raw material, and reacting with an alkaline sodium reagent in a polar solvent to obtain the difluoro-sulfonyl imide sodium.
The alkaline sodium reagent is selected from sodium hydroxide, sodium acetate, sodium alkoxide such as sodium methoxide or sodium ethoxide, sodium carbonate, sodium bicarbonate, sodium oxide, sodium sulfate, etc.
The polar solvent is: any one of water, alcohols such as methanol or ethanol, nitriles such as acetonitrile or propionitrile, ketones such as acetone or 2-butanone, esters such as dimethyl carbonate, diethyl carbonate, ethyl acetate, etc., ethers such as tetrahydrofuran, methyl tert-butyl ether, ethylene glycol dimethyl ether, etc., or mixed solvents prepared according to different proportions, preferably ethanol or acetonitrile; the organic alkaline acid binding agent is as follows: any one of trimethylamine, triethylamine, N-diisopropylethylamine, tripropylamine, tributylamine, pyridine and the like is preferably triethylamine or tri-N-butylamine.
The reaction temperature is-40-120 ℃; the reaction temperature is preferably 0 to 60 ℃.
Further, the reaction solution of sodium difluorosulfimide obtained by the reaction is removed insoluble inorganic matters, the reaction solvent and the trialkylamine acid-binding agent are recovered by reduced pressure distillation, and the obtained solid is purified into white solid of sodium difluorosulfimide.
A preparation method of lithium bis (fluorosulfonyl) imide is characterized in that: the difluoro sulfonimide organic ammonium salt is taken as a raw material and directly reacts with an alkaline lithium reagent to obtain the difluoro sulfonimide lithium.
The molar ratio of the bis (fluorosulfonyl) imide trialkyl ammonium salt to the alkaline lithium reagent is 1:0.5-10, preferably 1:1.0-1.2.
The alkaline lithium reagent is selected from the group consisting of: any one of alkaline lithium reagents such as lithium alkoxide (e.g., lithium methoxide, lithium ethoxide, or lithium tert-butoxide), lithium organic carboxylate (e.g., lithium formate, lithium acetate), lithium oxide, lithium hydroxide, and lithium carbonate.
The reaction is preferably carried out in the presence of a solvent, which is a polar organic solvent or an aqueous solution, preferably: any one or a mixed solvent of water, nitriles such as acetonitrile or propionitrile, alcohols such as methanol or ethanol, ketones such as acetone or 2-butanone, esters such as dimethyl carbonate, diethyl carbonate, ethyl acetate, etc., ethers such as tetrahydrofuran, methyl tert-butyl ether, ethylene glycol dimethyl ether, etc., and particularly preferably ethanol or acetonitrile.
The reaction temperature is-50 to 50 ℃, preferably-20 to 5 ℃. The applicant found through experiments that: when the reaction temperature is higher, decomposition products are obtained; when the reaction is carried out at a lower temperature, the hydrolysis product can be obviously reduced, and the ideal product yield is obtained, so that when the reaction temperature is controlled between-20 ℃ and 5 ℃, the yield and purity of the reaction are higher.
After the reaction is finished, insoluble inorganic matters generated by the reaction are removed by filtration, and the obtained reaction solution is distilled under reduced pressure to recover a reaction solvent and a trialkylamine acid-binding agent, so that a white solid lithium bis (fluorosulfonyl) imide reaction product is obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a preparation method of difluoro sulfimide organic salt, which has the advantages of few reaction steps, safety, environmental protection, easy operation, good product purity, high yield and the like.
2. The invention avoids the fluorination reaction step under the conditions of high temperature and high pressure, does not use high-risk poisonous gas materials such as hydrogen fluoride, fluorine gas and the like, has the advantages of high reaction safety, easy operation, low equipment requirement, suitability for industrial production and the like.
3. The invention has cheap and easily obtained raw materials, and the ammonium salt serving as the main reaction raw material can be added into a reaction system in a simple powder solid or solution mode prepared into accurate concentration, so that the simultaneous use of various toxic gas raw materials is avoided, and the reaction control difficulty and the reaction risk are effectively reduced.
4. The difluoro sulfonimide triethylammonium salt prepared by the invention can be further used for preparing difluoro sulfonimide lithium salt, difluoro sulfonimide sodium salt, difluoro sulfonimide potassium salt and the like, and the products are important raw materials for preparing lithium ion batteries, sodium ion batteries and potassium ion batteries, so that the difluoro sulfonimide triethylammonium salt has extremely high industrial application prospect.
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
Drawings
FIG. 1 is a diagram of a bis-fluorosulfonyl imide triethylammonium salt prepared according to example 1 of the present invention 1 HNMR spectra.
FIG. 2 is a diagram of a bis-fluorosulfonyl imide triethylammonium salt prepared according to example 1 of the present invention 19 FNMR spectrum.
FIG. 3 is a lithium bis-fluorosulfonyl imide salt prepared in example 7 of the present invention 19 FNMR spectrum.
FIG. 4 is a diagram of a sodium salt of bis-fluorosulfonyl imide prepared in example 8 of the present invention 19 FNMR spectrum.
Detailed Description
EXAMPLE 1 preparation of Difluorosulfonyl imide triethylammonium salt
Under the nitrogen atmosphere, 9.3 g of ammonium fluoride is added into a 250mL high-pressure reaction kettle, the temperature is controlled to 10 ℃, 75.5 g of triethylamine and 60.0 g of acetonitrile are sequentially pumped in, the mixture is stirred for 0.5 hour, 51.0 g of sulfuryl fluoride gas is slowly introduced at the temperature of 10 ℃ and is continuously kept at the temperature of 10 ℃ for 4 hours, and the reaction is finished. The reaction solution is distilled under reduced pressure to recover the reaction solvent, and the concentrated solution is washed with water and dried to obtain 65.0 g of bis (fluorosulfonyl) imide triethylammonium salt, and the yield is 95 percent% 1 HNMR spectra are shown in FIG. 1 and 19 the FNMR spectrum is shown in FIG. 2).
Product confirmation:
LC/MS detection shows that the molecular weight (m/e) of the negative ion is 180, which is consistent with the chemical structure (IV) of the difluoro sulfimide negative ion,
of the reaction products 1 HNMR spectra are shown in FIG. 1, which shows the results of the reaction with bis-fluorosulfonyl imide triethylammonium salt (II) (R=CH 2 CH 3 ) Is identical in chemical structure.
Example 2
The experimental conditions of the preparation method are the same as in example 1, except that: the selection and amount of ammonium salt was adjusted and its effect on the product yield was examined as shown in table 1.
TABLE 1 influence of the selection and amount of different ammonium salts on the reaction yield
Sequence number Ammonium salts Dosage of Yield is good
Example 2-1 Ammonium chloride 13.4 g (0.25 mol) 92％
Example 2-2 Ammonium bromide 24.5 g (0.25 mol) 95％
Examples 2 to 3 Ammonium bisulfate 28.8 g (0.25 mol) 95％
Examples 2 to 4 Ammonium bicarbonate 19.8 g (0.25 mol) 93％
Examples 2 to 5 Ammonium hydrogen oxalate 26.8 g (0.25 mol) 90％
Example 3
The experimental conditions of the preparation method are the same as in example 1, except that: aprotic polar solvents were adjusted and their effect on product yields was examined as shown in table 2.
TABLE 2 influence of different aprotic polar solvents on reaction yield
Sequence number Aprotic polar solvents Yield is good
Example 3-1 Acetonitrile 95％
Example 3-2 Acetone (acetone) 70％
Examples 3 to 3 Diethyl carbonate 80％
Examples 3 to 4 Acetic acid ethyl ester 55％
As shown in table 2: since both the reactants and the products are strongly polar ionic compounds, the polar solvent facilitates the completion of the reaction and yields a correspondingly higher reaction yield, it being evident that acetonitrile is the preferred reaction solvent.
Example 4
The experimental conditions of the preparation method are the same as in example 1, except that: the chemical structure of the organic basic acid-binding agent was adjusted and its effect on the product yield was examined as shown in table 3.
TABLE 3 influence of different organic basic acid-binding Agents on reaction yield
Sequence number Organic alkaline acid-binding agent Yield is good
Example 4-1 Trimethylamine 90％
Example 4-2 Triethylamine 95％
Examples 4 to 3 N, N-diisopropylethylamine 92％
Examples 4 to 4 Tripropylamine 85％
Examples 4 to 5 Trin-butylamine 65％
。
As shown in table 3: the organic alkaline acid-binding agent with different chemical structures is selected, and the product yield gradually decreases as the alkyl group in the acid-binding agent becomes larger, which may be related to the ability of the acid-binding agent to adsorb hydrofluoric acid byproducts generated by the reaction. It is clear that triethylamine is the preferred organic basic acid-binding agent.
Example 5
The experimental conditions of the preparation method are the same as in example 1, except that: the molar ratio of sulfuryl fluoride, organic basic acid-binding agent to ammonium salt was adjusted and its effect on the purity of the reaction was examined as shown in table 4.
TABLE 4 influence of different reaction Material ratios on reaction yields
Sequence number Sulfuryl fluoride, organic basic acid-binding agent and ammonium salt (molar ratio) Yield is good
Example 5-1 1：1：0.5 81％
Example 5-2 1：1：1 80％
Examples 5 to 3 1：1.5：0.5 95％
Examples 5 to 4 1:1.5:0.3 60％
Examples 5 to 5 1:1.5:1 94％
Examples 5 to 6 1:2:0.5 94.5％
。
As shown in table 4: the organic alkaline acid-binding agent not only participates in the hydrofluoric acid byproduct generated by the adsorption reaction, but also participates in the salification process of the reaction product, so that different reaction material ratios are selected, and the yield of the reaction product is greatly influenced, in general, the molar ratio of sulfuryl fluoride, the organic alkaline acid-binding agent and ammonium salt is controlled between 1:1 and 10:0.2 and 1, and the best embodiment is as follows: the molar ratio of the sulfuryl fluoride, the organic alkaline acid binding agent and the ammonium salt is 1:1.5:0.5.
Example 6:
the experimental conditions of the preparation method are the same as in example 1, except that: the reaction temperature was adjusted and its effect on the reaction yield was examined as shown in table 5.
TABLE 5 influence of different reaction temperatures on reaction yields
Sequence number Reaction temperature Holding time Yield is good
Example 6-1 0℃ 4h 90％
Example 6-2 10℃ 4h 95％
Examples 6 to 3 30℃ 4h 90％
Examples 6 to 4 60℃ 4h 75％
。
As shown in table 5: the reaction yield was 90% at a reaction temperature of 0 ℃. When the reaction temperature was increased to 10 ℃, the reaction yield reached 95%, and the reaction yield was not significantly increased but gradually decreased by continuing to increase the reaction temperature, presumably at a higher reaction temperature, the rate of by-product formation increased perhaps faster.
Example 7: preparation of lithium bis (fluorosulfonyl) imide
70.5 g of bis (fluorosulfonyl) imide triethylammonium salt and 141 g of acetonitrile are added into a 250mL three-port reaction bottle under the nitrogen atmosphere, the temperature of the reaction system is reduced to minus 30 ℃, then 9.49 g of lithium methoxide is added, the reaction is stirred for about 3 hours, then the temperature is raised to room temperature, the vacuum degree of the system reaches about 0.06Pa, the reaction is continued until the reaction is completed, insoluble inorganic byproducts are removed by filtration, trialkylamine and water generated in the reaction process are removed by reduced pressure distillation at 50 ℃ in the reaction solution, the reaction solvent is recovered, and 42.1 g of bis (fluorosulfonyl) imide lithium white solid is obtained, and the yield is 90.0%.
Product confirmation:
LC/MS test shows that the molecular weight (m/e) of the reaction product is 180, which is consistent with the chemical structure (II) of the difluoro sulfimide anion,
the reaction product is further tested by anion chromatography, and the ion peak retention time and the peak value of the obtained lithium difluorosulfimide are consistent with those of a standard lithium difluorosulfimide standard sample. The obtained lithium bis (fluorosulfonyl) imide reaction product 19 The FNMR spectrum is shown in FIG. 3, and only one resonance absorption peak of 51.90ppm fluorine is contained, which is consistent with the chemical structure of lithium bis-fluorosulfonyl imide.
The reaction product is tested by atomic absorption spectrum to obtain the following result, which proves that the reaction product is lithium salt
Sequence number Detection item (Test Items) Test method (Methods) Results (Results)
1 Lithium (Li, ppm) WI-24-19 148725
2 Sodium (Na, ppm) WI-24-16 11.59
3 Calcium (Ca, ppm) WI-24-16 1.33
4 Potassium (K, ppm) WI-24-16 1.97
5 Lead (Pb, ppm) WI-24-16 0.15
6 Iron (Fe, ppm) WI-24-16 0.66
7 Copper (Cu, ppm) WI-24-16 0.21
8 Zinc (Zn, ppm) WI-24-16 1.98
9 Magnesium (Mg, ppm) WI-24-16 0.12
10 Chromium (Cr, ppm) WI-24-16 0.01
11 Nickel (Ni, ppm) WI-24-16 ND
12 Manganese (Mn, ppm) WI-24-16 0.02
13 Barium (Ba, ppm) WI-24-16 ND
14 Cadmium (Cd, ppm) WI-24-16 0.01
15 Aluminium (Al, ppm) WI-24-16 0.19
。
Example 8: preparation of sodium bis (fluorosulfonyl) imide
In a 250mL three-port reaction flask, 56.4 g of bis-fluorosulfonyl imide triethylammonium salt and 56.4 g of acetonitrile were added under nitrogen atmosphere, followed by 10.6 g of sodium carbonate, and stirred and heated to 50℃until no carbon dioxide gas was generated. Insoluble inorganic matters are removed by filtration, the reaction solution is distilled under reduced pressure at 50 ℃ to recover the reaction solvent, 39.8 g of white solid is obtained, and the yield is 98.0 percent
Product confirmation:
LC/MS test shows that the molecular weight (m/e) of the reaction product is 180, which is consistent with the chemical structure (II) of the difluoro sulfimide anion,
the reaction product was further tested by anion chromatography, and the retention time and peak type of the ion peak of the obtained product are consistent with those of standard difluoro sulfonimide salt. Of the reaction products 19 The FNMR spectrum is shown in FIG. 4, which shows that only one resonance absorption peak of 51.90ppm of fluorine is contained, and the resonance absorption peak is consistent with the chemical structure of sodium bis-fluorosulfonyl imide.
The following results are obtained by the atomic absorption spectrum test of the reactant, and the reaction product is proved to be sodium salt
。

Claims (10)

1. The preparation method of the difluoro sulfimide organic ammonium salt is characterized by comprising the following steps: the difluoro sulfinyl imine organic ammonium salt is obtained by taking sulfuryl fluoride and ammonium salt as reaction raw materials and reacting under the action of an aprotic polar solvent and an organic alkaline acid binding agent.
2. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 1, which is characterized in that: the aprotic polar solvent is selected from any one of the following: acetonitrile, acetone, dimethyl carbonate, diethyl carbonate, ethyl acetate, tetrahydrofuran, methyl tert-butyl ether or ethylene glycol dimethyl ether.
3. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 2, which is characterized in that: the aprotic polar solvent is acetonitrile.
4. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 1, which is characterized in that: the ammonium salt is selected from any one of the following ammonium salts: ammonium fluoride, ammonium chloride, ammonium bromide, ammonium bisulfate, ammonium bicarbonate, ammonium bisulfate.
5. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 1, which is characterized in that: the organic basic acid-binding agent is selected from the group consisting of: trimethylamine, triethylamine, N-diisopropylethylamine, tri-N-propylamine, tri-N-butylamine, pyridine.
6. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 5, which is characterized in that: the organic alkaline acid-binding agent is triethylamine or tri-n-butylamine.
7. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 1, which is characterized in that: the molar ratio of the sulfuryl fluoride to the organic alkaline acid binding agent to the ammonium salt is 1:1-10:0.2-1.
8. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 7, which is characterized in that: the preferred molar ratio of the sulfuryl fluoride, the organic basic acid binding agent and the ammonium salt is 1:1.5:0.5.
9. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 1, which is characterized in that: the reaction temperature is 0-60 ℃.
10. The method for preparing the organic ammonium salt of difluoro-sulfonyl imide according to claim 9, which is characterized in that: the reaction temperature is 10-30 ℃.
CN202311136301.2A 2023-03-16 2023-09-05 Preparation method of difluoro sulfonimide organic ammonium salt Pending CN117185934A (en)

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