20 results about "Potassium fluoride" patented technology

The application discloses a potassium fluorotantalate crystallization purification method, and relates to the technical field of tantalum hydrometallurgy and fluorotantalate crystallization purification. The method comprises the following steps: filtering a tantalum-containing fluorine acid solution, adding a potassium source and a tantalum-niobium separation type composite crystallization regulator, stirring and complexing, seed induction, controlled cooling crystallization, graded removal of the regulator, solid-liquid separation, and potassium fluoride containing fluorine acid washing to obtain primary purified potassium fluorotantalate crystals, and then redissolving the primary purified potassium fluorotantalate crystals in a fluorine-containing acid solution, correcting the K / Ta molar ratio, repeatedly regulating and crystallizing, graded removal of the regulator, washing, and drying to obtain high-purity potassium fluorotantalate. The regulator can reduce the entrainment of niobium impurities and reduce the residual amount of the regulator itself, thereby improving the purity of the product and the Ta yield.

This application relates to the field of synthesis technology of lithium-ion battery electrolyte additives, specifically to a synthesis process of 1,3-propanedisulfonyl fluoride. The synthesis process includes the following steps: S1. Adding 1,3-propanedisulfonyl chloride and potassium fluoride to a reaction vessel; S2. Adding distilled water as a reaction solvent to the reaction vessel and refluxing under stirring; S3. After the reaction solution has settled and separated into layers, separating and collecting the oil phase, adding toluene and activated carbon to the oil phase, and refluxing for decolorization; S4. Performing a first crystallization treatment on the decolorized solution, followed by filtration, and washing the filter cake obtained from the filtration; S5. Collecting the filtrate obtained after the first washing and performing a second crystallization treatment, followed by filtration again; S6. Vacuum drying the filter cake obtained in steps S4 and S5 to obtain 1,3-propanedisulfonyl fluoride. This application features mild reaction conditions, simple operation, low cost, and environmental friendliness.

The present application relates to the technical field of lithium ion battery recycling, in particular to a method for stripping lithium ion battery pole piece and application thereof. The method for stripping lithium ion battery pole piece comprises: immersing the pole piece into a mixed solution containing a stripping agent and a stripping aid for reaction, and obtaining the separated active material layer and the current collector layer after a period of time; the stripping agent comprises a carboxylic acid containing at least two carboxyl groups; the stripping aid comprises at least one of sodium fluoride, potassium fluoride, ammonium fluoride, phosphoric acid, sodium phosphate, monosodium phosphate, sodium metaphosphate, potassium phosphate, monopotassium phosphate, potassium metaphosphate, ammonium phosphate, disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, inositol hexaphosphate and its salt, inositol pentaphosphate and its salt, inositol tetraphosphate and its salt, and inositol triphosphate and its salt. The method can realize the separation of the active material and the current collector, the hydrogen production amount is small during the whole stripping process, the current collector obtained after stripping is intact, the separation time is short, and the separation efficiency is high.

This invention relates to the field of lithium fluoride mother liquor resource recovery technology, and discloses a low-energy-consumption method for treating lithium fluoride mother liquor containing impurities. The method involves filtering the impure lithium fluoride mother liquor and then passing it through a potassium chloride or sodium chloride aqueous solution into a displacement electrodialysis device for desalination, yielding lithium chloride solution, dilute lithium fluoride solution, and potassium fluoride or sodium fluoride solution. The lithium chloride solution and potassium fluoride or sodium fluoride solution are then concentrated using a low-pressure reverse osmosis device. The resulting concentrate is subsequently pre-concentrated by membrane distillation and further concentrated by electrodialysis. The high-concentration lithium chloride concentrate is then purified by defluorination resin to obtain lithium chloride mother liquor. The dilute lithium fluoride solution is concentrated by reverse osmosis and purified by a heavy-duty softening resin before being refluxed. This invention, by combining reverse osmosis, membrane distillation, and electrodialysis, along with a dedicated purification resin and a multi-path circulation and reflux mechanism for desalination permeate, reduces the system energy consumption of lithium fluoride mother liquor treatment, improves water resource utilization, and increases the overall purity of the final mother liquor product.

The application belongs to the technical field of compound preparation, and particularly relates to a preparation method of an alkali metal salt of an oxalate chelate structure, at least comprising the following steps: mixing tris(trimethylsilyl) phosphate, an oxalate and a phosphorus-containing or boron-containing fluorine compound in a first organic solvent, stirring and heating to obtain lithium phosphate, trimethyl fluorosilane gas, and difluorobisoxalate phosphate or difluorooxalate borate, filtering the reaction solution to obtain lithium phosphate solid and a difluorobisoxalate phosphate solution or a difluorooxalate borate solution; adding a second organic solvent for recrystallization after concentration; and obtaining difluorobisoxalate phosphate or difluorooxalate borate solid after filtration, and drying the solid under reduced pressure to obtain a finished product. The process is simple, and the cost is low. By-products lithium phosphate, potassium fluoride and hexamethyldisiloxane can be directly sold as products after purification. Therefore, the application has an atomic utilization rate close to 100%, no invalid waste, less three-waste emissions, and is friendly to the environment.

This invention discloses a continuous method for preparing 3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxylic acid based on a cascaded process of cyclization-de-alcoholization-scraped membrane fluorination, belonging to the field of continuous synthesis technology in fine chemicals. The method includes: cyclizing ethyl 2-ethoxymethylene-4,4-dichloroacetoacetate with methylhydrazine in a loop reactor with forced external circulation, controlling the circulation ratio boundary at 15:1 to 18:1 to improve the selectivity of the target isomer; continuously removing at least some ethanol from the cyclized liquid and adding sulfolane for solvent replacement, ensuring that the ethanol content in the system before entering the fluorination stage is no higher than 1.0% (wt) and the water content is 0.1-0.2% (wt); subsequently, the resulting intermediate material, along with anhydrous potassium fluoride and 18-crown-6 to form a heterogeneous slurry, is fed into a vertical scraped membrane reactor, with a residence time strictly controlled at 169-171°C for 80-100 seconds, and rapid cooling within 3 seconds after discharge; finally, the target product is obtained through hydrolysis and acidification. This specific combined process can achieve high 1,3-isomer selectivity, high fluorination conversion, low aldehyde byproduct levels, and good long-term continuous operation stability without separating the cyclization intermediate.

The application belongs to the technical field of photocatalysis, and particularly relates to a substructure-controllable penicillium crustosum template titanium-based composite material and a preparation method and application thereof. The application uses cheap and easily obtained penicillium crustosum with high silicon content as a biological template, and uses potassium fluoride and glycerol as a regulator to realize multi-element step-by-step complex regulation of the substructure of the composite material. The addition of potassium fluoride makes K 1.28 Ti8O 16 , K2Ti6O 13 appear, and form a ternary heterojunction with anatase TiO2, so as to realize the substructure regulation of the penicillium crustosum template titanium-based composite material. The application first proposes the ternary heterojunction, and introduces the penicillium crustosum biological template with high silicon content, so that the adsorption performance and visible light catalytic performance are both optimized, and the complex structure is achieved. The composite material is used as a catalyst to degrade tetracycline under visible light, the method used is simple and convenient, is suitable for expanding the production scale, and has a good application prospect.

This invention discloses a method for preparing hydrogen fluoride using ammonium fluoride. Specifically, ammonium fluoride and potassium fluoride are dissolved in water to obtain a mixed solution. After the mixed solution reacts at 100℃~200℃, solid-liquid separation is performed. The solid is dried to obtain potassium fluoride solid, while the liquid is returned to the initial ammonium fluoride and potassium fluoride reaction system for recycling. Potassium fluoride and sodium fluoride are mixed and hydrogen fluoride gas is prepared under molten conditions. After the reaction, the residual solid is dissolved in water, filtered, and the filtrate is returned to the ammonium fluoride and potassium fluoride reaction system for recycling. The filter cake is dried and returned to the potassium fluoride and sodium fluoride reaction system for recycling. This method can realize material recycling and solves the problems of low raw material utilization and serious material waste in existing hydrogen fluoride preparation processes.

This application discloses a molten salt electrolyte for preparing aluminum-scandium master alloys and its application. The molten salt electrolyte comprises, by weight, the following components: 65-80 parts sodium fluoride; 10-20 parts potassium fluoride; 1-15 parts lithium fluoride; and 2-30 parts interfacial active salt; wherein the aluminum content is less than or equal to 500 ppm; and the interfacial active salt is selected from magnesium fluoride and / or calcium fluoride.

A method for preparing high-purity potassium fluoride by stepwise alkaline hydrolysis of potassium fluosilicate, which comprises: preparing a slurry by adding water to potassium fluosilicate with a K2SiF6 content of 99.0 wt.%; heating to 85-95 DEG C; rapidly adding potassium hydroxide to rapidly increase the pH of the reaction system to 12.0-14.0; stopping the addition of potassium hydroxide after the potassium fluosilicate is completely hydrolyzed; continuing the reaction under stirring until the pH falls to 10.0-10.5, white precipitate appears in the system; continuing the reaction until the pH falls to 9.0-9.5; adding potassium hydroxide to adjust the pH to 9.5-10.0; continuing the reaction until the hydrolysis reaction is completed; filtering the slurry to obtain a clear filtrate; adding an industrial hydrofluoric acid solution to the filtrate after heating; controlling the pH of the reaction end point to 7.5-8.0; filtering after 30-60 min of reaction; obtaining a clear potassium fluoride solution; evaporating and concentrating the potassium fluoride solution; cooling and crystallizing; drying; and obtaining high-purity potassium fluoride with a KF content of 99.5 wt.%.

This invention relates to a method for preparing and applying a highly dispersed Ni-TON molecular sieve, belonging to the field of molecular sieve material preparation and catalytic application technology. The preparation method achieves high dispersion of nickel species in the TON molecular sieve by optimizing the combination of key process parameters, particularly controlling the introduction of nickel nitrate within a "critical time window" of 10-30 minutes after mixing the potassium fluoride mineralizer with the gel, followed by hydrothermal crystallization, calcination, and nitric acid exchange. This molecular sieve possesses both high crystallinity and highly dispersed hydrogenation active centers, exhibiting high conversion rate (>99%), high selectivity (>87%), and excellent isomerization performance (isomeric / n-alkane ratio >2.5) in the hydrogenation of hydrocarbon-based biodiesel to biojet fuel. The process conditions of this invention are mild and controllable, with good reproducibility, suitable for large-scale production, providing a new strategy for the preparation of high-performance hydroisomerization catalysts.

The present application relates to a kind of method for extracting high-purity potassium fluoride solution and extraction system uses pre-dispensing, splitting fluorination, quenching absorption, spray absorption, tail gas purification five-step method, extracts high-purity potassium fluoride solution (including acid and alkaline two kinds), realizes waste gas liquid recycling and environmental protection standard discharge after use.

This invention discloses a continuous preparation method for 3,4-difluorobenzonitrile, using 3,4-dichlorobenzonitrile and potassium fluoride as raw materials, and carrying out a fluorination reaction in the presence of an aprotic polar solvent, a dehydrating agent, and a phase transfer catalyst. The method is characterized by the following steps: S1: 3,4-dichlorobenzonitrile, an aprotic polar solvent, and a dehydrating agent are continuously added to the middle of a dehydration tower; potassium fluoride and a composite phase transfer catalyst are continuously added to the bottom of the dehydration tower; the dehydrating agent-water azeotrope distilled from the top of the dehydration tower is condensed and separated, with the aqueous phase discharged and the oil phase dehydrating agent returned to the tower; the bottom material undergoes a fluorination reaction. This invention employs a composite phase transfer catalyst system composed of a main catalyst and a co-catalyst. The main catalyst, N-bis(dimethylamino)-1,3-dimethylimidazoline, ensures the reaction activity, while the co-catalyst, tetraphenylphosphonium chloride or tetraphenylphosphonium bromide, enhances the thermal stability of the system. The synergistic effect of these two catalysts significantly improves the reaction efficiency, with a total yield exceeding 98.0%.

This invention relates to the field of organic synthesis, specifically to a method for the preparation of difluoroenones and their in-situ reaction with amines, alcohols, etc., to convert them into the corresponding difluoroacetamides and difluoroacetic acid esters. The invention involves sequentially adding potassium fluoride, an amine or alcohol, and a difluorobromoacrylsilyl compound to a reaction solvent under a nitrogen atmosphere to obtain a mixture. This mixture is stirred at 25°C until the reaction is complete, filtered, and purified to obtain the difluoroacetamide or difluoroacetic acid ester compound. The preparation method of this invention is simple to operate (highly reactive difluoroenones are generated in situ and participate in the reaction), achieving efficient synthesis of difluoroacetamide / difluoroacetic acid esters and avoiding the use of highly volatile difluoroacetyl chloride. The difluorobromoacrylsilyl used in this invention can be conveniently prepared on a large scale and can be purified by distillation. The reaction conditions involved in the preparation method of this invention have good substrate tolerance and can be applied to aliphatic amines, aromatic amines, and various primary and secondary alcohols.