15 results about "Sodium bifluoride" patented technology

In one embodiment, an anhydrous hydrogen fluoride generator vessel (also referred to herein as the “AHF generator vessel”) is provided. In several embodiments, an AHF generator vessel may include a container assembly, one or more shelves, and a center pipe assembly. The container assembly may include a lid assembly that may be removably coupled to the wall, and one or more feet. The center pipe assembly may include a base adapter, a center pipe, and a bottom adapter. In one embodiment, sodium bifluoride is loaded onto the one or more shelves which are positioned perpendicular to the center pipe and stacked upon one another. An external heat source may provide the heat to the vessel to thermally degrade the sodium bifluoride into HF and sodium fluoride (NaF). In various embodiments, the HF may be carried by a carrier gas out of the AHF generator vessel via the lid assembly.

The invention relates to an etching solution composition for a Cu-Mo alloy multi-film structure. The etching solution comprises the following components in percentage by weight: 13-25% of hydrogen peroxide, 1-5% of a chelating agent, 0.2-9% of an etching agent, 0.01-1.5% of an inhibitor, 0.005-1% of a fluorine compound, 0.005-0.5% of an interface protective agent, 0.01-3% of a hydrogen peroxide stabilizer and the balance of water, the interface protective agent comprises a compound containing a sulfonic acid group. The etching solution composition prepared by the invention can be adapted to a 2W1D (two-time wet etching and one-time dry etching) process, the panel manufacturing cost is reduced, and the yield is improved; the fluorine compound comprises hydrogen fluoride and sodium hydrogenfluoride in a weight ratio of (1-3): 1, the roughness of the a-Si surface can be reduced, CD-loss (unilateral loss) is 0.6-0.7 [mu] m, and the taper angle is 50-60 degrees.

The present invention relates to the field of sodium ion battery technology and provides sodium tetrafluoroborate, a preparation method, and applications thereof. The method comprises the following steps: introducing a gas into a sodium bifluoride solution, mixing, and concentrating the solution to obtain the sodium tetrafluoroborate. The method utilizes a one-step method to synthesize the sodium tetrafluoroborate, which is low-cost, simple, fast, and thorough, shortening the process time. No water is produced as a by-product, and the product yield reaches 92.2%. The resulting sodium tetrafluoroborate has a purity of 99.9%.

The invention discloses a method for recovering HF (hydrogen fluoride) from hydrofluoric acid waste liquid obtained in an aromatic fluoride industrial synthesis process. According to the HF recovery method provided by the invention, sodium fluoride is taken as a carrier, excessive sodium fluoride reacts with hydrogen fluoride in the hydrofluoric acid waste liquid to generate sodium bifluoride, and HF is released through suction filtration, drying and thermal liberation. The HF is subjected to adsorption-desorption circulation through NaF, so that the purpose of recycling HF without discharging three wastes is achieved; meanwhile, the filtrate returns to the aromatic fluoride industrial synthesis process to be recycled as an absorbent of diazonium salt pyrolysis tail gas; the obtained sodium fluoride is recycled as an HF adsorbent, so that the effect of recycling multiple resources is achieved.

The invention provides an AG glass etching method and equipment thereof, and relates to the technical field of glass etching. A sodium hydrogenfluoride solution is stored in the etching pool, a motor is fixedly mounted outside the etching pool, a driving chain wheel is arranged on a driving shaft of the motor, and a short chain is connected outside the driving chain wheel; a transmission shaft is connected outside the etching pool, a driven chain wheel is arranged at the end of the transmission shaft, and the driving chain wheel is in transmission connection with the driven chain wheel through a short chain. Two long chains are connected to the exterior of the transmission shaft, and two rotating frames are symmetrically mounted in the etching pool. When AG glass at one station is subjected to soaking etching operation, feeding and discharging operation can be carried out on AG glass at the other station, etching treatment can be carried out on the AG glass continuously, and the etching treatment efficiency of the AG glass is greatly improved. The problems that in the actual application scene of existing AG glass etching processing equipment, time consumed in the feeding and discharging links is long, the proportion is large, and the production efficiency of AG glass etching is greatly restricted are solved.

The utility model provides a hydrofluoric acid recovery device for replacing aromatic hydrogen fluoride diazonium salt pyrolytic reaction waste liquid. The hydrofluoric acid recovery device comprises a rectifying still, a rectifying tower, a reflux device, an oil-water separator, a moisture meter, a liquid level meter and a finished product receiving tank, the top of the rectifying tower is connected with an inlet end of a reflux device, an outlet end of the reflux device is connected with an oil-water separator, an upper-layer overflow port of the oil-water separator is connected with the rectifying still, and a lower-layer outlet end of the oil-water separator is connected with a finished product receiving tank; the side wall of the oil-water separator is provided with a transparent observation window; the transparent observation window is connected with a liquid level meter; and the moisture meter and the liquid level meter are both connected with the oil-water separator. Probes of the moisture meter and the liquid level meter are positioned in the oil-water separator, so that monitoring is facilitated. After hydrofluoric acid is recovered by the device, an upper-layer organic solvent flows back to the rectifying still again, so that residual liquid is reduced, and meanwhile, sodium hydrogenfluoride and sodium fluoride can be further recovered conveniently; concentrated sulfuric acid is not used, hazardous waste is not generated, and the process temperature is reduced.

The application discloses a preparation method of sodium tetrafluoroborate and an electrolyte, and the preparation method comprises the following steps: S1, preparation of an ionic raw material solution: mixing a boron source compound and a sodium source compound according to a stoichiometric ratio to obtain a raw material mixture, and dissolving the raw material mixture to form the ionic raw material solution; S2, preparation of sodium tetrafluoroborate crude product: performing a hydrothermal reaction on the ionic raw material solution obtained in the step S1, crystallizing, and vacuum drying to obtain the sodium tetrafluoroborate crude product; S3, purification of sodium tetrafluoroborate: dissolving and filtering the sodium tetrafluoroborate crude product obtained in the step S2, and crystallizing to obtain the final sodium tetrafluoroborate; and the sodium source compound is sodium fluoride and / or sodium hydrogen fluoride. The preparation method of the sodium tetrafluoroborate has the characteristics of low safety risk, green environmental protection, high product yield and strong process operability.

The application provides a method for preparing sodium hexafluorophosphate for sodium batteries from sodium bifluoride, which comprises the following steps: taking electronic-grade sodium hydroxide and electronic-grade hydrofluoric acid as raw materials to generate an intermediate product sodium fluoride, and then reacting the intermediate product with phosphorus pentafluoride to obtain high-purity sodium hexafluorophosphate for sodium batteries. The particle size distribution and yield of sodium fluoride crystals are controlled by adjusting the stirring rate and cooling conditions, and then the purity and yield of sodium hexafluorophosphate are controlled, so that the purity of the finally obtained sodium hexafluorophosphate can reach more than 99.8%, the yield can reach more than 85%, the sodium hexafluorophosphate has the advantages of low cost and high yield, and is beneficial to industrialized production.

The invention discloses a preparation method of a fluoro aromatic compound, which comprises the following steps: (1) preparing arylamine hydrofluoride from hydrogen fluoride and arylamine in a ring reactor, and (2) enabling the arylamine hydrofluoride to flow into a diazotization ring reactor, and adding solid sodium nitrite into the diazotization ring reactor in proportion by a continuous feeder to carry out diazotization reaction; (3) transferring the diazotization product to carry out solid-liquid separation, and enabling the liquid to flow into a multi-stage pyrolysis annular reactor; (4) the multi-stage annular pyrolysis reactor comprises at least three stages of annular pyrolysis reactors, the pyrolysis temperature is gradually increased according to the inflow direction, and the temperature difference between the adjacent annular pyrolysis reactors is 3-10 DEG C; and (5) carrying out post-treatment to obtain the fluoro aromatic hydrocarbon compound. According to the method disclosed by the invention, the byproduct sodium bifluoride is recovered by solid-liquid separation of the diazonium liquid, and the tandem ring-shaped reactors can realize full-process automation, so that the reaction is accurately controlled, reliable, continuous and stable, few organic byproducts are generated, the yield is as high as 92% or above, and the purity is as high as 99.97%.

The application relates to a preparation method of sodium bisfluorosulfonimide, which comprises the following steps: carrying out fluorination reaction on bischlorosulfonimide acid and sodium fluoride in a weak polar solvent under microwave-induced catalysis to generate sodium bisfluorosulfonimide, wherein the weak polar solvent is an ester solvent. In the application, sodium fluoride is used as a fluorination reagent and a sodium reagent, bischlorosulfonimide acid can be directly converted into sodium bisfluorosulfonimide, the synthesis steps and the discharge of three wastes are reduced, the production efficiency is improved, and the production cost is reduced.

The invention discloses a resource recycling process of a sodium hydrogenfluoride mother liquor byproduct, and belongs to the technical field of fluorine chemical industry waste liquid treatment. The process comprises the following three steps: firstly, preparing a sodium fluoride crystal by regulating the molar ratio of Na to F to be (1.05-1.08): 1, optimizing a feeding mode and adding a seed crystal; secondly, regulating the molar ratio of F to Si to be (6-9): 1 by using the sodium fluoride mother liquor, and adding white carbon black to prepare sodium fluosilicate; and finally, treating the F-containing waste liquid by compounding quick lime and slaked lime, regulating the molar ratio of Ca to F to be (2.1-2.5): 1, and reacting for 1-2 hours under the conditions of 50-70 DEG C and 300-400 r / min, so that the F content in the wastewater is less than or equal to 10 mg / L and the ammonia nitrogen content is less than or equal to 15 mg / L. According to the process, the total fluorine recovery rate is larger than or equal to 99%, the silicon recovery rate is larger than or equal to 95%, the main content of prepared sodium fluoride is larger than or equal to 98%, the main content of sodium fluosilicate is larger than or equal to 98%, and efficient resource utilization of sodium hydrogenfluoride mother liquor byproducts is achieved.

The invention provides a preparation method of sodium hexafluorophosphate and a sodium-ion battery electrolyte in order to solve the problems that reaction conditions are harsh and chlorine-containing impurities are introduced when phosphorus pentachloride and hydrofluoride are used for preparing sodium hexafluorophosphate in the prior art. The preparation method comprises the following operation steps: synthesis of sodium hexafluorophosphate: introducing phosphorus pentafluoride gas into a hydrogen fluoride solution of sodium hydrogenfluoride, and reacting to obtain the hydrogen fluoride solution of sodium hexafluorophosphate; and solvent removal: distilling the hydrogen fluoride solution of sodium hexafluorophosphate to remove hydrogen fluoride and unreacted phosphorus pentafluoride to obtain sodium hexafluorophosphate. The preparation method provided by the invention can effectively reduce side reactions of the system, avoid introduction of impurities, and effectively improve the yield and purity of sodium hexafluorophosphate.

The present invention relates to a method for preparing sodium difluorophosphate, comprising the following steps: 1) reacting sodium fluoride, phosphorus pentoxide and hydrogen fluoride gas in a reaction vessel with supercritical carbon dioxide fluid as a dispersion medium; or reacting sodium hydrogen fluoride and phosphorus pentoxide in a reaction vessel with supercritical carbon dioxide fluid as a dispersion medium; 2) the generated sodium difluorophosphate is insoluble in the supercritical carbon dioxide fluid, and after the reaction is completed, the supercritical carbon dioxide fluid is discharged from the reaction vessel to obtain sodium difluorophosphate solid. The purity of the sodium difluorophosphate generated by the reaction is detected to be above 99%, and the yield is above 89%. The method for preparing sodium difluorophosphate provided by the present invention is simple to operate, has high reaction efficiency, high utilization rate of reaction raw material elements, high purification efficiency, and is green and environmentally friendly, and is suitable for large-scale industrial production.

The invention relates to a preparation method of bis (fluorosulfonyl) imide sodium, which comprises the following steps: in a weak polar solvent, bis (chlorosulfonyl) imide acid and sodium hydrogenfluoride are subjected to a fluorination reaction under microwave-induced catalysis to generate bis (fluorosulfonyl) imide sodium, and the weak polar solvent is an ester solvent. According to the invention, sodium hydrogen fluoride is used as a fluorination reagent and a sodium modification reagent, bis (chlorosulfonyl) imidic acid can be directly converted into bis (chlorosulfonyl) imidic acid sodium, synthesis steps and emission of three wastes are reduced, the production efficiency is improved, and the production cost is reduced.

This invention discloses a method for preparing sodium difluorophosphate, comprising the following steps: reacting phosphorus pentachloride, phosphorus pentoxide, and sodium hydrogen fluoride as raw materials in an organic solvent; after the reaction, purging with inert gas, filtering, concentrating and crystallizing, washing, and drying to obtain sodium difluorophosphate. This method features low raw material cost, simple process, rapid reaction, few by-products, no water introduction, high product purity, and is environmentally friendly.