27 results about "Bromic acid" patented technology

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 present invention relates to the preparation and use of high-entropy nanozymes with multi-pathway synergistic antibacterial effects, belonging to the field of nanozyme catalytic materials. The present invention, for the first time, utilizes a hydrothermal method and high-temperature calcination method to synthesize oxygen-vacancy-rich high-entropy oxides with haloperoxidase-like, peroxidase-like, and glutathione oxidase-like activities. These oxides can catalyze bromide ions and hydrogen peroxide to generate hypobromous acid, which interferes with bacterial quorum sensing, and hydroxyl radicals, which disrupt structure and function. Furthermore, these oxides consume glutathione, which maintains the internal redox balance of bacteria. This allows for multi-pathway synergistic and efficient bacterial damage and inactivation, helping to address the problems of existing antifouling nanozyme materials, which suffer from a single catalytic pathway and poor component adjustability. This allows for the practical expansion of high-entropy nanozyme coatings, and has potential application prospects in the field of marine biofouling.

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.

A urea treatment method in which hypobromite ions are generated by adding a chlorine-based oxidizer and a bromide salt to to-be-treated water containing urea so as to break down the urea in the to-be-treated water and obtain treated water, the method including: a) determining the free residual bromine concentration and the free residual chlorine concentration in the treated water; and b) controlling the added amount of the chlorine-based oxidizer and the bromide salt on the basis of the free residual bromine concentration and the free residual chlorine concentration. The device includes a bromide salt adding means, a chlorine-based oxidizer adding means, a urea decomposition tank, a residual chlorine meter, and a control device for controlling the added amount of the chlorine-based oxidizer by the chlorine-based oxidizer adding means on the basis of the method.

Provided is a water treatment method and the like that enables stable management of water systems. [Solution] According to one aspect of the present invention, there is provided a water treatment method for an aqueous system, comprising a supplying step and a control step, in which the supplying step supplies hypochlorite ions to the aqueous system to be treated, the aqueous system containing a bromide salt and a chlorine stabilizer, and the control step controls the concentration of hypobromite ions in the aqueous system to be treated at one or more of the timings before, during, and after the supplying step.

The invention belongs to the technical field of electro-catalysis, and discloses a method and device for preparing ethylene oxide through cathode and anode coupling electro-catalysis, and the method comprises the following steps: obtaining an electrolyte containing hydrogen peroxide in a cathode electrolytic cell; feeding the electrolyte containing hydrogen peroxide into a cathode reaction tank; electrolyte containing potassium hypobromite is obtained in an anode electrolytic cell; feeding the electrolyte containing potassium hypobromite into an anode reaction tank; in a cathode reaction tank, obtaining a reaction solution containing ethylene oxide; feeding the reaction liquid containing ethylene oxide into a reaction liquid flow mixing tank; in an anode reaction tank, obtaining a reaction solution containing a bromoalcohol intermediate; feeding the reaction liquid containing the bromoalcohol intermediate into a reaction liquid flow mixing tank; carrying out saponification reaction on the bromo-alcohol intermediate in the mixed flow tank; and after the saponification reaction is finished, carrying out reduced pressure distillation on the mixed solution to separate out ethylene oxide gas, and respectively feeding the liquid into an external catholyte tank and an external anolyte tank. The method improves the energy utilization rate.

A treatment liquid for a semiconductor containing a group 6 metal, the treatment liquid containing hypobromite ions. Also provided is a treatment liquid for a semiconductor containing a group 6 metal, the treatment liquid characterized by being formed by adding and mixing at least a bromine-containing compound, an oxidizing agent, a base compound, and water, wherein relative to a total mass, an added amount of the bromine-containing compound is 0.008 mass % or more and less than 10 mass % as an amount of bromine element, and an added amount of the oxidizing agent is 0.1 mass ppm or more and 20 mass % or less; and pH at 25° C. is 8 or higher and 14 or lower. Further provided is a method for producing the treatment liquid for a semiconductor.

A method for etching a metal barrier layer and a metal layer, and a method for manufacturing a semiconductor device, are disclosed. The method includes: forming a metal barrier layer and a metal layer on a substrate; and etching the metal barrier layer and the metal layer using an etching composition. The etching composition may include: an oxidant selected from nitric acid, bromic acid, iodic acid, perchloric acid, perbromic acid, periodic acid, sulfuric acid, methanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid, or combinations thereof; a metal etching inhibitor, including a compound represented by chemical formula 1 as shown in the specification; and a metal oxide solubilizer selected from phosphoric acid, phosphates, carboxylic acids having 3 to 20 carbon atoms, or combinations thereof.

The invention belongs to the technical field of green electrochemistry, and particularly relates to a synchronous electrooxidation reduction bromine extraction method which is carried out in an electrolysis device composed of an anode electrolytic tank and a cathode electrolytic tank, and the anode electrolytic tank and the cathode electrolytic tank are separated through a diaphragm; the method comprises the following steps: S1, introducing a bromine-containing raw material solution into an anode electrolytic tank; s2, adding an electrolyte into the cathode electrolytic tank; s3, applying oxidation potential to the working electrode, and carrying out electrochemical oxidation reaction to generate bromine molecules; s4, blowing out bromine molecules and carrying the bromine molecules into a cathode electrolytic tank; s5, the bromine molecules are subjected to a disproportionation reaction in the cathode electrolytic tank, and bromine ions and hypobromite ions are generated; the hypobromite ions are subjected to an electrochemical reduction reaction to generate bromide ions and hydroxyl ions; s6, continuously carrying out reactions in the steps S3 to S5; and S7, obtaining a concentrated bromine salt solution from the cathode electrolytic tank. The method provided by the invention realizes greenization and high efficiency of the bromine extraction process.

The invention relates to the technical field of organic synthesis, and discloses a synthesis method of 2-cyano-5-fluorobenzyl bromide, which comprises the following steps: mixing a compound I with sulfuric acid, adding potassium bromate, reacting, adding water, layering, distilling and purifying to obtain a compound II; mixing the compound II, cuprous cyanide and DMF, carrying out reflux reaction under stirring, cooling, adding water, extracting and filtering with ethyl acetate, layering, washing with water, desolventizing, and recrystallizing and purifying with methanol to obtain a compound III; mixing the compound III, tetrahydrofuran, water and methanol, dropwise adding a mixed solution of potassium borohydride, water and methanol while stirring, adding water, layering, extracting, desolventizing, cooling to separate out a solid, and filtering to obtain a compound IV; and mixing the compound IV, DCM and DMF, dropwise adding boron tribromide in batches while stirring, adding water, layering, desolventizing, cooling to separate out a solid, and filtering to obtain the 2-cyano-5-fluorobenzyl bromide. The method is reasonable in design route, short in synthesis route, high in safety coefficient and suitable for industrial production.

The utility model discloses a device for refining by-product hydrobromic acid and recovering organic raw materials in the by-product hydrobromic acid, which comprises a box body, a gas guide pipe is arranged on the outer surface wall of the box body close to the top along the horizontal direction in a penetrating manner, and a first partition plate, a second partition plate and a third partition plate are sequentially welded on the inner wall of the box body along the vertical direction. According to the utility model, on the basis of the original recovery device, the device is added to realize the effect of secondary condensation, and the gas with organic raw materials is totally condensed into water and flows into the recovery chamber through continuous circulating ventilation in the cold air chamber, primary condensation treatment on the gas and continuous circulating cold water in the cold water chamber; the gas which does not achieve the condensation effect can enter the gas guide pipe again through the recovery pipe under the action of the gas pump and is circularly condensed, so that the organic raw materials can be thoroughly condensed and recovered, and the bromine dropping speed can be accelerated and the production efficiency can be improved through the device.

The invention provides a dithiothreitol preparation method, which comprises: carrying out an addition reaction on butadiene and hypobromous acid, and refining to obtain 1, 4-dibromo-2, 3-butanediol; and adding hydrosulfide to carry out substitution reaction to obtain the dithiothreitol. According to the method, the synthesis route is greatly shortened, byproducts are few, the yield is improved, the product purity can reach 99% or above, and the cost is low; meanwhile, the intermediate is high in stability, high in purity and easy to store, the generation of intermediates which are extremely high in corrosivity and susceptibility to allergy is avoided, and the preparation method has great advantages on industrial enlarged production and environmental protection.

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.

The present invention provides a urea treatment method and apparatus, which can optimize the addition amount of chlorine-based oxidants such as NaClO required for urea decomposition. The urea treatment method generates hypobromite ions by adding a bromide salt and a chlorine-based oxidant to the water to be treated containing urea, thereby decomposing the urea in the water to be treated to obtain treated water, including: step a), respectively obtaining the residual free bromine concentration and the residual free chlorine concentration in the treated water; and step b), controlling the addition amounts of the bromide salt and the chlorine-based oxidant based on the residual free bromine concentration and the residual free chlorine concentration. As the apparatus (1), it has a bromide salt addition unit (11), a chlorine-based oxidant addition unit (12), a urea decomposition tank (2), a residual chlorine meter (3), and a control device (4) for controlling the addition amount of the chlorine-based oxidant added by the chlorine-based oxidant addition unit based on the above method.

Methods for treating water in a water system to reduce the amount of trihalomethanes (“THM”) in the water. The methods include combining with the water a stabilized halogen biocide that is stabilized with at least one of sulfamic acid and a hydantoin in sufficient amounts so that the water has a residual total halogen amount that is from 0.1 ppm to 50 ppm, for example. The THM in the treated water can be significantly reduced as compared to treatments in which hypochlorous acid and / or hypobromous acid are the only antimicrobial agents.

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 invention relates to Malabaricone A and an analogue thereof, a preparation method and an application of the Malabaricone A and the analogue thereof in resisting MRSA. The structural formula of the related compound is shown as a formula I; according to the method, bromic acid is taken as a raw material, and total synthesis is completed through four steps of arylation reaction, Grignard reaction and the like. The compound disclosed by the invention is applied to preparation of a medicine for resisting methicillin-resistant staphylococcus aureus.

The present disclosure provides a method for distinguishing potassium chlorate from potassium bromate, including the following steps: using a “HCHO—NaHSO3—Na2SO3” pH clock system as a distinguishing solution, and distinguishing the potassium chlorate and the potassium bromate according to different responses, namely different induction times, of the pH clock system, caused by the potassium chlorate and the potassium bromate, respectively. In the present disclosure, the pH clock system provided by the distinguishing method has an intuitive graph, and can easily and quickly distinguish the potassium chlorate and the potassium bromate; meanwhile, the distinguishing method has simple equipment, a high accuracy, and easy operation and observation.

The invention discloses a method for improving Faraday efficiency of bromine ion mediated styrene epoxidation. According to the method, a bromine ion mediated styrene photoelectrocatalysis epoxidation reaction is carried out by utilizing a three-electrode system taking alpha-Fe2O3 as a working electrode, bromine ions are oxidized in a photo-anode local acid environment to generate hypobromous acid under the condition of no stirring, and then styrene is oxidized by the hypobromous acid to generate epoxy with high selectivity and high Faraday efficiency. The method is simple, easy to operate and low in cost, and has certain universality for styrene substrates.

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.

Methods for treating water in a water system to reduce the amount of trihalomethanes ("THM") in the water. The methods include combining with the water a stabilized halogen biocide that is stabilized with at least one of sulfamic acid and a hydantoin in sufficient amounts so that the water has a residual total halogen amount that is from 0.1 ppm to 50 ppm, for example. The THM in the treated water can be significantly reduced as compared to treatments in which hypochlorous acid and / or hypobromous acid are the only antimicrobial agents.

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 invention provides a bromine extraction method and a bromine extraction system for seawater, and the bromine extraction method comprises the following steps: S1, adding a hydrochloric acid solution into the seawater for acidification treatment, and introducing chlorine into the seawater for oxidation treatment to obtain bromine-containing seawater; s2, enabling the bromine-containing seawater to be in reverse contact with the circulating gas, and performing blowing-out treatment to obtain bromine-containing circulating gas and bromine-blown seawater; s3, enabling the bromine-containing recycle gas to be in contact with a sodium hydroxide solution for absorption treatment, and carrying out disproportionation reaction to obtain absorption completion liquid rich in bromide ions and bromate ions and recycle gas; s4, enabling the absorption completion liquid to be in contact with a hydrochloric acid solution to generate a neutralization reaction, and introducing steam for distillation treatment to obtain bromine-containing steam and tail liquid; s5, sequentially performing condensation bromine-water separation treatment on the bromine-containing water vapor to obtain industrial bromine, bromine-containing water and bromine-containing gas; seawater is adopted as a raw material, and the whole process of hydrochloric acid acidification, chlorine oxidation, air blow-out, alkaline absorption and distillation bromine extraction is combined, so that efficient bromine extraction is realized.

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 the direct oxidation of nitrobenzaldehyde to nitrobenzaldehyde, belonging to the field of organic synthesis technology. The method includes the following steps: mixing nitrobenzaldehyde, an organic solvent, a catalyst, an oxidant, and a strongly oxidizing acid, and carrying out an oxidation reaction to obtain nitrobenzaldehyde; the catalyst is a heteropolyacid salt; the oxidant is Mn₂O₃, sodium hypochlorite, or hydrogen peroxide. This invention develops a highly efficient metal heteropolyacid salt catalyst, which, in conjunction with the oxidant, achieves highly selective direct catalytic oxidation of nitrobenzaldehyde to nitrobenzaldehyde, avoiding the numerous steps, severe over-oxidation, and large amounts of bromine / acid-containing wastewater generated by traditional methods. The direct oxidation method is simple, has high chemical selectivity, produces no wastewater, and the reaction medium can be recovered, showing broad application prospects.

The present invention provides a composition having an excellent dissolving ability for a transition metal-containing substance and a method for treating a substrate. The composition according to an embodiment of the present invention contains at least one oxohalogen acid compound selected from the group consisting of hypochlorous acid, chlorous acid, chloric acid, bromic acid, and salts thereof and a compound represented by Formula (1), in which a content of the compound represented by Formula (1) is 1.0% to 25.0% by mass with respect to a total mass of the composition.

The invention discloses a preparation method of a multifunctional polyoxometalate copper complex and application of the multifunctional polyoxometalate copper complex in water pollution treatment, and belongs to the technical field of high-molecular compounds, and the key points of the technical scheme are as follows: the chemical formula of the polyoxometalate copper complex is [Cu3 (L) 3 (H2O) 3 (PMo12O40)]. 3H2O, and an organic ligand HL is 2, 2 '-bipyridine-6-carboxylic acid. The organic ligand HL is formed by removing one carboxyl group from 2, 2 '-bipyridine-6, 6'-dicarboxylic acid (H2X) in situ. 6 L <-> connects 6 Cu < 2 + > by using carboxyl oxygen to form a metal calix [6] arene cyclic structure [Cu6 (L) 6 (H2O) 6] 6 < + >, four Cu < 2 + > are respectively connected with terminal oxygen of four (PMo12O40) 3 <->, (PMo12O40) 3 <-> anions are connected with adjacent [Cu6 (L) 6 (H2O) 6] 6 < + > rings by adopting a two-bridging coordination mode, and [Cu6 (L) 6 (H2O) 6] 6 < + > is connected to form a two-dimensional wave-shaped layered structure. The method is mainly used for synthesizing the inorganic-organic hybrid material of the polyacid-based copper complex, which has ferromagnetism, can be used for treating organic dye pollutants and antibiotic pollutants in wastewater, can be used for electrocatalytic oxidation and reduction of biomolecules and inorganic ions, and has current sensing response to bromate ions.