20 results about "Bromate" patented technology

Method for producing ferronickel and removing chromium from nickel laterite ore. This disclosure discloses a method for producing ferronickel and removing chromium from nickel laterite ore, comprising the following steps: (1) washing and separating the nickel laterite ore to obtain an ore slurry and mineral aggregate, adding an alkaline liquid and a bromate, and introducing oxygen into the ore slurry to enable oxidation leaching, and then carrying out solid-liquid separation to obtain a chromium-containing solid and filtrate; (2) washing and separating the solid obtained in step (1) to obtain a solid phase and wash water, and mixing the solid phase with quicklime and a reducing agent to obtain a mixture; and (3) roasting and smelting the mixture obtained in step (2) successively to obtain a finished ferronickel product.The method can achieve chromium enrichment and produce ferronickel by smelting nickel laterite ore while removing chromium impurities, which can protect the safety of a furnace.

This invention provides a temperature-resistant shape memory polymer plugging agent, its preparation method, and its application, belonging to the field of oil and gas drilling technology. The preparation method of this plugging agent includes the following steps: mixing acetic acid and perchloric acid to obtain a mixed acid, then adding bromate, potassium permanganate, and natural flake graphite, and stirring to obtain low-temperature expanded graphite; mixing cyanate ester, linear aliphatic epoxy resin, and an active diluent, then adding low-temperature expanded graphite, organotin compounds, and amine catalysts, and carrying out a curing reaction to obtain a temperature-resistant shape memory polymer material; testing the glass transition temperature (Tg) of the synthesized temperature-resistant shape memory polymer material, compressing it at (Tg+5)~(Tg+10)℃, and then cooling, pulverizing, and granulating to obtain the final product. The plugging agent of this invention can rapidly recover its original shape at high temperatures, accumulate and seal leakage channels, and form a high-strength sealing layer in fractures, meeting the requirements of safe and efficient drilling.

The present application relates to a trace neodymium doped phenethylamine lead bromide monocrystal capable of simultaneously enhancing light yield and shortening decay time and application thereof, which solves the technical problem that the prior art is difficult to simultaneously improve light yield and shorten luminescence decay time. The trace neodymium doped phenethylamine lead bromide monocrystal capable of simultaneously enhancing light yield and shortening decay time is prepared by the following steps: 1) weighing; phenethylamine hydrobromide, lead bromide and neodymium bromide are weighed and placed in a glass bottle; the molar ratio of the phenethylamine hydrobromide, lead bromide and neodymium bromide is 2:1:(0.02-0.05); 2) obtaining a precursor solution; N,N-dimethylformamide is added to the glass bottle, heated and stirred until completely dissolved to obtain a precursor solution; 3) obtaining a crystal; the precursor solution is filtered and placed in a glass beaker for crystallization to obtain a neodymium doped phenethylamine lead bromide monocrystal; through adjustment of the crystal band structure by neodymium, the radiation recombination rate is improved.

Methods and systems for the controlled production of aqueous halogen solutions with varying compositions are disclosed. According to an embodiment, aqueous solutions of hypochlorite ions are modified through the sequential addition of pH adjusting chemicals, non-chloride halide ions, and halogen stabilizing compounds. Sensors, for measuring physical and chemical properties of the solutions as they change due to the impact of the various chemical reactions, are linked to a control system which, in turn, can control the input of one or more chemicals. The control system facilitates the production of a solution with desired characteristics in terms of pH, specific halogen composition, degree of halogen stabilization, and limiting the production of undesired by products such as bromate ions.

The invention provides a diaphragm, a preparation method and a lithium secondary battery, the diaphragm comprises a diaphragm base material and a coating covering at least one surface of the diaphragm base material, and the coating contains a bromine-containing compound; the diaphragm base material comprises a positive electrode side facing a battery positive electrode, the coating comprises a first coating covering the positive electrode side, and a bromine-containing compound in the first coating comprises bromide; the diaphragm base material comprises a negative electrode side facing a battery negative electrode, the coating comprises a second coating covering the negative electrode side, and a bromine-containing compound in the second coating comprises at least one of bromate and hyperbromate. The coating containing the bromine-containing compound is arranged on the surface of the diaphragm base material and reacts with the lithium dendrites to convert the lithium dendrites into active lithium ions, so that the lithium dendrites are prevented from puncturing the diaphragm to cause internal short circuit of the battery, the safety performance of the battery is improved, and the service life of the battery is prolonged. And meanwhile, irreversible attenuation of battery capacity caused by loss of active lithium ions is reduced, the capacity retention ratio of the lithium secondary battery is improved, the performance stability is improved, and the service life is prolonged.

The application discloses a visible light catalyst and a preparation method thereof. Firstly, ZnFe2O4 nanoparticles are prepared by a liquid phase mixing-evaporating solvent-calcining method; then the ZnFe2O4 nanoparticles are uniformly dispersed in an aqueous solution containing different mass of glucose, the glucose is converted into hydrothermal carbon (HC) through a hydrothermal reaction, and the HC is combined with the ZnFe2O4 nanoparticles to obtain a series of HC / ZnFe2O4 nanocomposites. The method is simple and easy to implement, raw materials are easy to obtain, and the cost is low; the nanocomposite has high visible light catalytic activity on the reduction of bromate and hexavalent chromium in water, and can be applied to treating bromate and hexavalent chromium pollutants in water as a new visible light catalyst.

The application provides a preparation method of a silver-copper ferrite-iron-based metal organic framework composite material, and comprises the following steps: step S1, a copper ferrite material is prepared by improving a pH value and a hydrothermal temperature and by adding different additives through a modified solvothermal method; step S2, an iron-based metal organic framework material is prepared by improving a pH value and stirring conditions at room temperature through a sol-gel method; step S3, a heterostructure is formed by combining the copper ferrite material and the iron-based metal organic framework material through an ultrasonic method, so that a copper ferrite-iron-based metal organic framework composite material is obtained; and step S4, a silver quantum dot is photo-deposited on the surface of the copper ferrite-iron-based metal organic framework composite material through a photo-deposition method, so that a silver-copper ferrite-iron-based metal organic framework composite material is prepared. The silver-copper ferrite-iron-based metal organic framework composite material prepared by the application can be used for removing oxygen-containing acid salt pollutants in drinking water, such as nitrate, bromate and chlorite, and has a wide application prospect.

This invention discloses a method for the etherification of 5-cyanodiol hydrochloride to citalopram bromate using a dehydration membrane. The method includes: adding 5-cyanodiol hydrochloride, toluene, and a strong acid resin catalyst to a round-bottom reaction flask equipped with a magnetic stirrer; placing a water separation membrane in the reaction flask; maintaining a high vacuum on the permeate side of the water separation membrane; and then heating the reaction on a magnetically stirred heater. In the toluene system, the water separation membrane removes the water generated in situ through vapor permeation, driving the reaction forward, breaking the thermodynamic equilibrium constraint, improving product yield and purity, and achieving coupling of reaction and separation. This invention uses a strong acid resin catalyst coupled with a water separation membrane, resulting in a simple reaction procedure and favorable reaction conditions; the catalyst is safe and stable, with a low risk factor, is a green catalyst, can be recycled, and is easily separated from the reaction liquid; the water separation membrane removes water in situ through vapor permeation, improving raw material conversion rate and product purity.

The invention provides a synthesis method of an (E)-2-methylpentyl-1, 3-diene compound, which comprises the following steps: by taking a compound as shown in a formula (3) as a raw material, reacting in an organic solvent under the action of triethylamine hydrobromide (Et3N.HBr) to generate the (E)-2-methylpentyl-1, 3-diene compound as shown in a formula (4). The method can be carried out under mild conditions, and the problems that traditional metal catalysis or strong acid catalysis is poor in compatibility with sensitive functional groups, harsh in reaction condition, serious in environmental pollution and the like are solved; meanwhile, the substrate is high in universality and can be compatible with electron-donating and electron-withdrawing substituted benzene ring substrates and various heteroaromatic ring substrates; besides, post-treatment of the product is simple and convenient, a high-purity product can be obtained through conventional column chromatography, and a brand new scheme is provided for green synthesis of isoprene fine chemicals.

The invention discloses a transition metal nanoparticle graphene oxide self-assembled catalytic membrane for effectively removing oxysalt in a water body, and belongs to the technical field of water treatment functional membranes. A transition metal nanoparticle (such as iron, manganese and the like) dispersion liquid and a graphene oxide dispersion liquid are directly mixed, and the composite catalytic membrane is formed through self-assembly by utilizing the interaction between nanoparticles and graphene oxide lamellas. Metal ion adsorption and in-situ reduction steps are not needed, the process is simple and efficient, and large-scale preparation is easy. The obtained composite membrane has a remarkable nano confinement effect, can efficiently activate sulfite to generate reducing free radicals and rapidly degrade oxysalt pollutants such as bromate in a water body, the removal rate of 80 micrograms / L bromate in 3 minutes exceeds 96%, and the composite membrane has good stability and reusability.

The invention provides a temperature-resistant shape memory polymer plugging agent as well as a preparation method and application thereof, and belongs to the technical field of petroleum and natural gas drilling. The preparation method of the plugging agent comprises the following steps: mixing acetic acid and perchloric acid to obtain mixed acid, then adding bromate, potassium permanganate and natural crystalline flake graphite, and carrying out stirring reaction to obtain low-temperature expanded graphite; the preparation method comprises the following steps: mixing cyanate ester, straight-chain aliphatic epoxy resin and a reactive diluent, then adding low-temperature expanded graphite, an organic tin compound and an amine catalyst, and carrying out a curing reaction to obtain the temperature-resistant shape memory polymer material, testing the glass transition temperature Tg of the synthesized temperature-resistant shape memory polymer material, compressing at (Tg + 5)-(Tg + 10) DEG C, cooling, crushing and granulating to obtain the temperature-resistant shape memory polymer material. The plugging agent disclosed by the invention can quickly recover to the original shape at high temperature, is stacked to plug a leakage channel, forms a high-strength plugging layer in a crack, and meets the requirements of safe and efficient drilling.

The invention discloses a gradient separation and recovery method for halogen in combustion tail gas, and belongs to the technical field of environmental protection. The method comprises the following steps: spraying combustion tail gas introduced into a spraying tower by utilizing spraying liquid containing alkaline earth metal ions, reacting calcium ions in the spraying liquid with hydrogen fluoride to generate alkaline earth metal fluoride precipitate, and filtering to separate calcium chloride precipitate and tail gas absorption liquid; the tail gas absorption liquid is conveyed into the electrochemical treatment tank for electrochemical treatment, and bromide ions in the tail gas absorption liquid are oxidized into bromate ions, so that chloride and bromate in reaction effluent can be separated by using a nanofiltration membrane in subsequent steps; the halogen is separated and recycled from the tail gas through an integrated process of spraying, electrochemical treatment and membrane separation, so that the integration of pollution reduction and recycling is realized, the waste gas treatment process is simplified, the waste gas treatment cost is favorably reduced, and the conversion from the halogen pollution attribute to the resource attribute is innovatively realized.

This invention discloses a method for the cascade separation and recovery of halogens from combustion exhaust gas, belonging to the field of environmental protection technology. This invention utilizes a spray liquid containing alkaline earth metal ions to treat the combustion exhaust gas fed into a spray tower. Calcium ions in the spray liquid react with hydrogen fluoride to form alkaline earth metal fluoride precipitates. The alkaline earth metal fluoride precipitates and exhaust gas absorbent are separated by filtration. The exhaust gas absorbent is then transported to an electrochemical treatment tank for electrochemical treatment, oxidizing bromide ions in the absorbent to bromate ions. This allows for subsequent separation of chlorides and bromates in the reaction water using a nanofiltration membrane. This invention, through an integrated process of "spraying + electrochemical treatment + membrane separation," separates and recovers halogens from exhaust gas, achieving integrated pollution reduction and reuse, simplifying the waste gas treatment process, reducing waste gas treatment costs, and innovatively transforming halogens from a pollution resource.

The application relates to a neodymium-doped phenethylamine lead bromide monocrystal capable of greatly shortening light emission decay time and an application thereof, and solves the technical problem of long light emission decay time of an existing phenethylamine lead bromide monocrystal. The neodymium-doped phenethylamine lead bromide monocrystal capable of greatly shortening light emission decay time is prepared by the following steps: 1) weighing; phenethylamine hydrobromide, lead bromide and neodymium bromide are weighed and placed in a glass bottle; the mass ratio of the phenethylamine hydrobromide, the lead bromide and the neodymium bromide is (2.0-2.4):0.8:0.2; 2) obtaining a precursor solution; N,N-dimethylformamide is added to the glass bottle, heated and stirred until completely dissolved to obtain the precursor solution; 3) obtaining a crystal; the precursor solution is filtered and then placed in a glass beaker to crystallize, so that the neodymium-doped phenethylamine lead bromide monocrystal is obtained, the light emission decay time of which can be greatly shortened by about 3 times, but the quantum yield is not significantly reduced.

The invention discloses an o-phenylenediamine borane derivative as well as a preparation method and application thereof in treatment of morphine addiction, and the preparation method comprises the following steps: carrying out substitution reaction on an o-nitroaniline compound and 2-(N, N-dimethylamino) ethyl bromohydrobromide under the action of alkali to obtain a compound c; reducing nitryl by the compound c under the action of a reducing agent to obtain a compound d; and reacting the compound d under the action of BH3. THF to obtain the o-phenylenediamine borane derivative. Compared with DMT, the o-phenylenediamine borane derivative prepared by the preparation method disclosed by the invention has the advantage that the anti-neuroinflammation activity is remarkably improved.

The application discloses a hydrated electron solution for degrading pollutants and application thereof, and belongs to the technical field of pollutant degradation. 16 The PBS solution is prepared under ultrasonic conditions by dropwise adding the [Bmim]PF6 and [C The preparation method of the application can be used for degrading pollutants, is simple, has low preparation cost, and can reach degradation rates of 75% and above for perfluorooctanoic acid and bromate after adding potassium iodide, respectively.

The invention belongs to the field of chemical engineering, and discloses a method and device for producing lithium bromide, and the method comprises the following steps: introducing bromine-containing gas into an iron powder suspension to obtain a first mixed solution; filtering the first mixed solution to obtain an iron bromide solution and iron powder; adding lithium carbonate into the ferric bromide solution to obtain a second mixed solution; carrying out filter pressing on the second mixed solution to obtain a lithium bromide solution and a ferric hydroxide solid; and evaporating and drying the lithium bromide solution to obtain a lithium bromide solid product. According to the method, the use of hazardous chemical chlorine in the traditional bromine extraction process is avoided, meanwhile, the use of hazardous chemical bromine is avoided, the problem of byproduct lithium bromate in the traditional lithium bromide production process is avoided, high-purity lithium bromide is prepared, and safe and environment-friendly extraction and utilization of bromine resources are achieved.

The application belongs to the technical field of chemical reducing materials, and specifically discloses a nitrogen and phosphorus co-doped carbon-based confined ferrophosphorus composite material, a preparation method and application thereof, and regeneration. First, iron precursor molecules, zinc salt, organic ligand and solvent are mixed to perform a polymerization reaction to obtain Fe@ZIF-8 material; then, the Fe@ZIF-8 material and a phosphorus source are sequentially subjected to phosphorization reaction and carbonization reaction to obtain the nitrogen and phosphorus co-doped carbon-based confined ferrophosphorus composite material. In the material, P doping can improve the specific surface area, electron transfer capacity and dispersibility of the material. Fe2P active sites formed by coordination of Fe and P significantly inhibit Fe leaching in the reaction process, and enhance the stability of the material; the material can efficiently reduce and remove bromate ions and other harmful substances in a wide pH value range; and the material can be regenerated by phosphorization, and a high reduction rate is maintained.

This invention provides a method for preparing a nickel foam-supported Ru-Ni(OH)2 electrode with good catalytic performance and its application. The preparation method is as follows: (1) The initial nickel foam support is immersed in a 3 mol / L hydrochloric acid solution for ultrasonic etching, and then removed and ultrasonicated with ethanol and deionized water respectively; (2) The nickel foam from step (1) is placed in a homogeneous solution of nickel nitrate, ammonium fluoride and urea for hydrothermal reaction. After the reaction, it is removed, washed with ethanol and deionized water, and dried to obtain nickel foam loaded with nickel hydroxide; (3) The nickel foam loaded with nickel hydroxide from step (2) is immersed in a ruthenium trichloride solution for ion exchange. After the reaction, the electrode is removed, washed with water, and dried to obtain a nickel foam-supported Ru-Ni(OH)2 electrode. The nickel foam-supported Ru-Ni(OH)2 electrode prepared by the method of this invention exhibits excellent removal effect on bromate in wastewater, and the prepared electrode has high stability.

The invention relates to a BLG-1-based electric ignition element and a preparation method thereof. Wherein the primary explosive is bromic acid 4, 4 '-diazo-1, 2, 4-triazole copper (BLG-1); the binder is one or more of polyvinyl alcohol, nitrocotton and phenolic resin; the ignition powder is one or more of Zr / KClO4, B / KNO3 and Al / KClO4; the ignition component is one of a bridge wire, a bridge belt and a semiconductor bridge. The ignition powder and the binder are mixed in proportion and coated on the surface of an ignition component, and after drying, the mixture of the ignition powder and the binder is dipped to prepare the ignition head. The electric ignition element has high safety, can continuously release bright flames and generate hot solid residues, and has high ignition capacity.