11 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 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.

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 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.

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 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 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.