17results about "Boron halogen compounds" patented technology

The invention relates to a preparation method of sodium fluoborate, which comprises the following steps: step a, dissolving sodium fluoride and sodium sulfate solid residues generated in the production process of nuclear grade boron-10 acid in a certain amount of deionized water, and filtering; b, evaporating the filtered solution, crystallizing when the residual volume of the evaporated solution reaches a certain degree, and then filtering again; and step c, dissolving the sodium fluoroborate obtained after filtration in a certain amount of ultrapure water, filtering and drying to obtain the high-purity sodium fluoborate. According to the invention, direct preparation of sodium fluoborate is realized, the step of firstly converting sodium fluoborate into boric acid in the traditional process is omitted, the process steps are optimized, the reaction time is shortened, the reaction flow is reduced, the utilization rate of raw materials is increased, and the reaction economy is improved.

The present invention provides a semiconductor process gas purification system that can repeatedly purify and regenerate semiconductor process gases and purification equipment without cooling them to extremely low temperatures or reducing purification efficiency. [Solution] A process gas purification apparatus comprising a cylindrical container, a heater positioned to cover the outer surface of the container, and a cooling gas pipe passing through the inside of the container, wherein the container is filled with a purifying agent for adsorbing impurity gases contained in the semiconductor process gas to be purified, and a semiconductor process gas inlet and outlet are provided for passing the semiconductor process gas to be purified through and bringing it into contact with the purifying agent, and the cooling gas pipe is covered with the purifying agent inside the container.

The invention discloses a low-cost high-purity potassium fluoborate preparation method based on ammonium fluoride, and belongs to the field of inorganic salt chemical industry, the method comprises the following steps: S1, reacting by-product ammonium fluoride with the purity of more than or equal to 99% with boric acid to synthesize an ammonium fluoborate solution; s2, at 60-80 DEG C, precisely dropwise adding a potassium chloride solution into the ammonium fluoborate solution at a rate of 1-2 mL / (min.L), and carrying out a replacement reaction; s3, performing crystallization and purification by adopting a two-stage gradient cooling program from fast to slow; s4, a low-temperature saturated potassium fluoborate solution and absolute ethyl alcohol are sequentially adopted for targeted washing, and impurities such as chloride ions are effectively removed; and S5, performing vacuum drying to obtain a product. According to the method, the phosphorus fertilizer industrial byproduct ammonium fluoride is originally adopted to replace expensive hydrogen fluoride or fluoboric acid, so that the raw material cost is reduced by 90% or above; meanwhile, impurity inclusion is effectively inhibited, the problem of impurity introduction caused by byproduct raw materials is solved, and the electronic-grade high-purity potassium fluoborate with the main content larger than or equal to 99.95% and the chloride ion smaller than or equal to 10 ppm can be stably prepared.

The present invention relates to a process for preparing hydroboranes by the hydrogenolysis of corresponding (pseudo-)haloboranes, in the presence of a base and optionally a catalyst. The process of the invention contributes to the circularity of the boron element by enabling the recycling of (pseudo-)haloborane compounds, common waste products of boron chemistry, into higher value-added hydroboranes. Figure for the abstract: None

The present disclosure provides a method for producing lithium fluoride, and the like, comprising: a step 1 for preparing an aqueous solution of at least one of lithium chloride and lithium sulfate; a step 2 in which an aqueous solution of at least one of lithium chloride and lithium sulfate is mixed with an aqueous hydrofluoric acid solution; and a step 3 in which a mixed solution of an aqueous solution of at least one of lithium chloride and lithium sulfate and an aqueous solution of hydrofluoric acid is mixed with an alkali, the pH of the liquid obtained in the step 3 being 3-6.

The present disclosure provides a method of preparing a target compound. The method includes the step of combining (A) an organosilicon component and (B) a catalyst including a boron cluster to give a mixture. The method further includes preparing a reaction mixture including the target compound from the mixture. The organosilicon component (A) includes (A1) a first organosilicon compound having a silicon-bonded C1-C4 alkyl group. When the first organosilicon compound (A1) does not include a silicon-bonded halogen atom, the organosilicon component (A) includes a second organosilicon compound (A2) including at least one silicon-bonded halogen atom. The disclosure further provides a reaction product prepared according to the method.

This invention provides oxyhalides, a method for producing the same, and an all-solid-state lithium battery. The production method includes step 1, in which a mixture of lithium and boron sources weighed in stoichiometric ratios is polished, sheeted, placed in a reaction tube, the reaction tube is vacuumed and sealed, and a first firing is performed at a temperature of 300-450°C for a duration of 4-20 hours; and step 2, after the first firing, the mixture is cooled to room temperature, the intermediate product in the reaction tube is removed, further polished, sheet-pressed, placed in the reaction tube, the reaction tube is vacuumed and sealed, a second firing is performed, and then the mixture is cooled to room temperature. The production method of this invention is simple, has a high utilization rate of raw materials, and does not contain by-products, making it advantageous for industrial production. The oxyhalides produced have high ionic conductivity and stability, and good interfacial stability with metallic lithium. The all-solid-state lithium batteries produced have excellent electrochemical performance.

This invention discloses a method for preparing high-purity potassium fluoroborate using by-product fluorosilicic acid, belonging to the field of fine chemical technology. It aims to solve the problems of incomplete removal of silicon impurities, limited product purity, and high raw material costs and environmental pressures associated with traditional fluorosilicic acid methods for potassium fluoroborate preparation. This invention uses by-product fluorosilicic acid as raw material and achieves green and efficient preparation of high-purity potassium fluoroborate by introducing a multi-stage targeted silicon removal and purification control strategy. The process includes raw material pretreatment and compatibility, primary reaction and initial silicon removal, secondary reaction and deep silicon removal, and tertiary reaction and directional crystallization. This methodological innovation, combined with the discovery of key parameters, enables a product purity of up to 99.7%, with the key impurity silica content below 0.02%, and a product yield as high as 96.2%. This invention not only significantly improves product purity and realizes high-value utilization of by-product resources and reduces production costs, but also has the advantages of being green, environmentally friendly, and highly safe.

Aspects of the present disclosure are directed to methods, compositions, and kits for detection and analysis of DNA and RNA modifications, such as DNA and RNA nucleobase methylation. Certain aspects include methods, compositions and kits useful in sequencing of methylated nucleic acids, including methylated nucleic acids from low-input samples such as cell-free DNA and cell-free RNA. Certain aspects include novel N-nitrosation strategies for deamination of DNA and RNA biological macromolecules under mild conditions. In some aspects, provided are compositions, methods, and kits comprising means for cooperative catalysis of a carbonyl organocatalyst with a Lewis acid to facilitate the formation of a C-nitro intermediate from a primary amine, which, upon rearrangement into N-nitrosamine, leads to selective deamination of unsubstituted canonical DNA and RNA bases under mild conditions.

A conjugate acid proton exchange polymer molecule includes an acidic aromatic unit in a main chain or a side chain, wherein the acidic aromatic unit is a conjugate acid of a basic aromatic unit, and a non-coordinating counter anion ionically linked with the acidic aromatic unit.

This invention relates to a compound, potassium fluoroborate, a nonlinear optical crystal of potassium fluoroborate, its preparation method, and its uses. The chemical formula of the compound is K₂B₂OF₆, and its molecular weight is 229.82. It is prepared by a room temperature solution method or a hydrothermal method. The crystal belongs to the hexagonal crystal system, with space group P₆(_)₂m, and cell parameters a=9.1105(13)Å, b=9.1105(13)Å, c=6.9919(17)Å, α=90°, β=90°, γ=120°, Z=3, and V=502.59(16)Å. 3 Potassium fluoroborate nonlinear optical crystals obtained by growing crystals using room-temperature solution methods, hydrothermal methods, or high-temperature melt methods possess advantages such as a wide transmission band, stable physicochemical properties, moderate mechanical hardness, resistance to breakage, and ease of cutting, polishing, and storage. They can be widely used in nonlinear optical devices such as frequency doubling converters and optical parametric oscillators.

The present application relates to the field of comprehensive utilization of wet-process phosphoric acid resources and preparation of new energy materials, and discloses a method for selectively recovering fluorine from wet-process phosphoric acid and preparing lithium difluorophosphate. By adding boric acid to the wet-process phosphoric acid, the fluorine species is converted, and tri-octylamine organic extraction system is used to selectively separate fluorine and phosphorus, and then lithium fluoroborate is prepared by back extraction, and further reacts with anhydrous oxalic acid to generate lithium difluorophosphate, and after recrystallization, battery-grade lithium difluorophosphate with a purity of 99.7% or above is obtained. The method realizes efficient recovery and high-value conversion of by-product fluorine resources in wet-process phosphoric acid, has the advantages of simplified process, high extraction selectivity, high resource utilization rate and significantly improved product added value, and can be used for preparation of lithium ion battery electrolyte.

The invention discloses a synthetic production method of white high-purity anhydrous silver tetrafluoroborate, which comprises the following steps: mixing and reacting mercury-free salt and anhydrous silver tetrafluoroborate in an anhydrous reaction medium to obtain anhydrous silver tetrafluoroborate; the mercury-free salt is at least one of anhydrous silver bis (trifluoromethanesulfonimide), anhydrous silver trifluoroacetate, anhydrous silver trifluoromethanesulfonate and anhydrous silver methanesulfonate; the tetrafluoroboric acid source is selected from at least one of anhydrous tetrafluoroboric acid and anhydrous tetrafluoroborate; the anhydrous reaction medium is at least one of absolute methanol, absolute ethyl alcohol, anhydrous dimethyl sulfoxide, anhydrous N-dimethylformamide, anhydrous dichloromethane, anhydrous tetrahydrofuran, anhydrous ethyl acetate, anhydrous ether, anhydrous petroleum ether, anhydrous isopropanol, anhydrous methyl acetate, anhydrous n-heptane, anhydrous cyclohexane and anhydrous acetone. According to the invention, the raw materials are non-toxic, no water is added or generated in the production process, and the prepared silver tetrafluoroborate is white, high in purity and free of crystal water.

The present disclosure provides a method of preparing an organosilicon compound. The method includes combining (A) a hydridosilane, (B) an arene compound, and (C) a catalyst including a boron cluster, thereby preparing a reaction mixture including the organosilicon compound. The hydridosilane (A) has the formula HSiQ3, where each Q is an individually selected halogen atom. The organosilicon compound has the formula RSiQ3, where R is an aryl group, and each Q is independently selected and defined above. The present disclosure further provides a reaction product prepared via the method.

The present application relates to a kind of low-temperature rectification separation methods of high-abundance boron halide-10 in the field of chemical synthesis and separation, comprising: S1, boron halide gas is pumped into dry device and is dry handled;S2, the boron halide gas that is handled by step S1 dry is pumped into rectification pipe body from the bottom of low-temperature rectification tower, rectification tank body is filled with liquid nitrogen, and multiple trays are arranged in rectification tank body, and the filler in the tray is graphene aerogel, and the boron halide pumped from the bottom of rectification tank body rises to the top of tower after sequentially passing through graphene aerogel in each layer of tray from bottom to top;S3, multiple low-temperature rectification towers are sequentially connected to form multistage low-temperature rectification tower, and the abundance of boron halide-10 in the boron halide gas output from the top of last-stage rectification tower is greater than or equal to 99%.The present application solves the technical problems such as corrosion and blockage caused by cracking in the chemical exchange rectification method of boron fluoride-methyl ether complex.

This invention discloses a lithium-rich ferric acid modified material, its preparation method, and its application. The lithium-rich ferric acid modified material comprises a lithium-rich ferric acid core and a coating layer; the coating layer covers at least a portion of the surface of the lithium-rich ferric acid core; the coating layer comprises lithium fluoride and lithium borate; the lithium-rich ferric acid core is doped with boron and fluorine. This invention constructs a lithium fluoride and lithium borate composite coating layer on the surface of a boron- and fluorine-doped lithium-rich ferric acid core. The resulting lithium-rich ferric acid modified material has the advantages of high charge / discharge specific capacity and good air stability, solving the problem of significant capacity reduction in lithium-rich ferric acid when exposed to air. This material can maintain a high specific capacity even after prolonged exposure to air, thus it can be used as a high-capacity lithium replenisher for lithium-ion batteries, achieving high lithium replenishment efficiency. Simultaneously, this material is prepared at low temperature, with short preparation time, simple process, low price, and is environmentally friendly.