14 results about "Bromic acid" patented technology

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.

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.

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 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.