69 results about "Bromate salt" patented technology

Compositions and methods are given for delayed breaking of viscoelastic surfactant gels inside formation pores, particularly for use in hydraulic fracturing. Breaking inside formation pores is accomplished without mechanical intervention or use of a second fluid. Bromate oxidizing agents are used along with selected breaking activators for the bromate breaking compounds. Useful bromate breaking activators include acid-generating breaking activators, oxidizing sulfur containing breaking activators, and reducing agent breaking activators.

A high-glossiness flame-retardant polypropylene composite comprises, by weight, from 45 to 95 parts of polypropylene, from 5 to 15 parts of flame-retardant agent, from 0 to 40 parts of flame retardant synergist, from 5 to 10 parts of compatilizer, from 0.5 to 3.0 parts of nucleating agent, from 0.2 to 1.0 part of lubricant, from 0.2 to 0.4 part of coupling agent and from 0.1 to 0.5 part of antioxidant. A flame-retardant system composed of magnesium hydroxide and melamine bromated is compounded with the polypropylene to endow the polypropylene composite with excellent flame-retardant performance, and polypropylene graft compound is added to improve compatibility of the flame-retardant agent with the polypropylene so as to further improve the flame retardancy. The high-glossiness flame-retardant polypropylene composite belongs to low-halogen flame-retardant polypropylene, contains little halogen flame-retardant components, is low in smoke generating quantity and toxicity, has the advantages of high glossiness, free of precipitation, high glow wire, low smoke density, high rigidity, surface hardness and heat resistance, and the like, and is widely applicable to fields of switch panels, sanitary wares, home appliance casings and the like.

The invention relates to a detection method for trace forbidden or restricted iodate and bromate in a cosmetic, and aims to provide the method which has the characteristics of high specificity, high anti-interference capacity and high accuracy. According to the technical scheme, the ion chromatography method for detecting iodate and bromate in the cosmetic comprises the following steps of: (1) preparing a sample: weighing a certain amount of cosmetic and placing in a centrifuge tube, and adding ultra-pure water to keep constant volume for later use; or adding the ultra-pure water and then ultrasonically oscillating, then loading on a centrifuge for centrifugal separation, taking supernatant and keeping constant volume for later use by using the ultra-pure water; or adding a certain amount of methylene dichloride, uniformly mixing through vortex, adding the ultra-pure water, ultrasonically oscillating, then loading on a centrifuge for centrifugal separation, taking the supernatant and keeping constant volume for later use by using the ultra-pure water; (2) enriching and purifying: taking the supernatant and collecting eluent through a water-phase filter membrane and an RP (Reversed Phase) column; and (3) loading on a machine for detection: taking the eluent and inputting into an ion chromatograph equipped with a post-column derivation device and an ultraviolet detector for detection.

Nucleoside compounds represented by formula (II) may be prepared by subjecting a 2′,3′,5′-triacyloxynucleoside compound represented by formula (I) to deacylation using alkali metal hydroxide in a 0.01- to 0.5-fold amount in a molar ratio relative to the moles of the 2′,3′,5′-triacyloxynucleoside compound. The production method of the nucleoside compound of formula (II) suppresses the formation of by-products, and the products amy be used for the production of nucleoside derivatives. In addition, oxidation of a nucleoside compound represented by formula (1) in the presence of a 2,2,6,6-tetramethylpiperidine-1-oxy catalyst, and hypochlorite or hypobromite, while adjusting pH to fall within 5 to 9, and further, extracting a nucleoside-carboxylic acid compound represented by the formula (2) into an organic solvent under acidic conditions, back-extracting the compound from the organic solvent into an aqueous alkali solution, and neutralizing the aqueous alkali solution by adding an acid thereto affords highly pure crystals of the compound of formula (2) or a salt thereof. wherein each symbol is as defined in the Description.

A method for extracting precious metals from a polymetallic ore, comprising a) generating hypochlorites from a salt brine; b) chlorination of the ore using hypochlorites under acidic conditions; c) filtering to collect a pregnant solution and treating the pregnant solution for collection of precious metals; d) filtering to separate the precious metals and a barren brine; e) purifying the barren brine; and f) recycling halogens from the purified brine in the form of hypohalites formed by electrolysis of the purified brine, and comprising hypochlorite and hypobromite; step b) further comprising scrubbing excess halogens using calcium hydroxide; treating the pregnant solution in step c) comprises reducing an oxydo reduction potential of the pregnant solution and using calcium hydroxide for neutralization; and step e) comprising increasing the pH of the barren brine by addition of calcium hydroxide.

The invention relates to a method for preparing 5-methyl-3-bromomethylpyridine hydrobromide. The method comprises a step of preparing methyl 5-methyl nicotinate; a step of preparing 5-methyl-3-pyridinemethanol; a step of preparing 5-methyl-3-pyridinemethanol hydrobromide; and a step of preparing 5-methyl-3-bromomethylpyridine hydrobromide. In the step of preparing methyl 5-methyl nicotinate, esterification of 5-methyl nicotinic acid and thionyl chloride is carried out under heating reflux to obtain methyl 5-methyl nicotinate; in the step of preparing 5-methyl-3-pyridinemethanol, a reduction reaction of methyl 5-methyl nicotinate and sodium borohydride is carried out in an organic solvent to obtain 5-methyl-3-pyridinemethanol; in the step of preparing 5-methyl-3-pyridinemethanol hydrobromide, 5-methyl-3-pyridinemethanol reacts with hydrobromic acid to obtain 5-methyl-3-pyridinemethanol hydrobromide; and in the step of preparing 5-methyl-3-bromomethylpyridine hydrobromide, 5-methyl-3-pyridinemethanol hydrobromide reacts with hydrobromic acid in an organic solvent and water is removed from the reaction system to obtain 5-methyl-3-bromomethylpyridine hydrobromide. According to the method, 5-methyl-3-bromomethylpyridine hydrobromide is obtained by four steps; the process is simple; and yield is high.

The invention relates to a preparation method of a homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane. The preparation method comprises the following steps: step 1, performing a reaction on 3-bromopropylamine-methylimidazole bromate (I) and x-chloro-1-alkanol (II) so as to generate an x-dihydroxy-alkyl-chain side-chain imidazolium salt (III); step 2, performing a reaction on the compound (III) so as to prepare an x-dichloro-alkyl-chain side-chain imidazolium salt (IV); step 3, dissolving amino-containing polyether sulphone (V), the x-dichloro-alkyl-chain side-chain imidazolium salt (IV) and 1-bromo-3-methylimidazolium salt-alkyl chain (VI) in an organic solvent, and carrying out still standing for defoaming so as to obtain a membrane castingsolution; and step 4, coating a clean glass plate with the membrane casting solution obtained in the step 3, carrying out an in-situ reaction, and performing vacuum drying so as to obtain the homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane. The prepared anion exchange membrane has the characteristics of a low swelling rate, good structural stability and high monovalent-multivalent permeation selectivity.

The invention discloses a disinfection composition and use thereof as well as a method for preparing a disinfectant from the same. The disinfection composition is composed of a component A and a component B, wherein the mass percent of the component A in the disinfection composition is M which is greater than or equal to 25% and less than or equal to 75%, and the mass percent of the component B in the disinfection composition is N which equals to result of 1 subtracting M; the component A is bromate, and the component B is reducing sulphur-containing compounds. The disinfectant provided by the invention has a good decontamination effect and is low in cost as the raw materials are easily available. The disinfectant disclosed by the invention has bactericidal broad-spectrum, is simple and efficient, and is good in fluidity, wide in suitable temperature, safe to use, free from pungent smell, small in corrosion to metal, free from toxicity residue, free from secondary pollution, and suitable for disinfection of environment, air and substance surfaces.

The invention relates to the field of water treatment, in particular to modified activated carbon, a preparation method thereof and a method for removing bromate in water. The method comprises the following steps: reacting the epoxidized quaternary ammonium salt solution with activated carbon to prepare the modified activated carbon; mixing the modified activated carbon with an aqueous solution containing bromate, and adsorbing to remove bromate. According to the method, the epoxidized quaternary ammonium salt is adopted to modify activated carbon, so that epoxidized functional groups and oxygen-containing functional groups on the surface of the activated carbon are subjected to a cationization reaction, quaternary ammonium salt functional groups and activated carbon chemical bonds are combined, the connection strength is improved, and the activated carbon is not prone to falling off in the water treatment process. After the modified activated carbon is in contact with bromate ions inwater, on one hand, nitrogen-containing functional groups with positive charges in quaternary ammonium salt have a strong electrostatic adsorption effect on bromate with negative charges; and on theother hand, alkyl long chains in the quaternary ammonium salt have strong adsorption attraction on the surface of the modified activated carbon, so that the removal effect on bromate is greatly improved under the dual effects.

The invention provides a synthetic method of dopamine hydrochloride, and belongs to the field of drug synthesis. The preparation method comprises the following steps: taking 3,4-dimethoxyphenylethylamine as an initial raw material, firstly reacting with an acid to form a salt, re-crystallizing and refining to obtain 3,4-dimethoxyphenylethylamine salt, reacting with hydrobromic acid to remove methyl to generate dopamine hydrobromide, and finally reacting with hydrochloric acid to form a salt so as to obtain dopamine hydrochloride. The preparation method provided by the invention has the advantages of cheap and easily available initial raw materials, simple process, no high-temperature and high-pressure hydrogenation step, low cost, high purity and high yield, and is suitable for industrialproduction.

The invention relates to application of a hydrogen matrix bio-membrane reactor in removal of bromated (BrO3) in drinking water, belonging to the technical field of water purification. According to the application, the hydrogen matrix bio-membrane reactor comprises a cylinder body, a reflux system, an inflow-outflow pipeline system and a hydrogen supply system, wherein a hollow fiber membrane as an attachment carrier of a bio-membrane is arranged in the center of the cylinder body, and two ends of the hollow fiber membrane are fixed at two ends of the cylinder body; the hollow fiber membrane is connected with the hydrogen supply system, hydrogen enters the hollow fiber membrane from the top of the reactor, is dispersed to an outer layer from an inner layer of the hollow fiber membrane, discharged into the cylinder body and is discharged out from a water outlet. The application provided by the invention has the beneficial effects that the operation is simple and safe, and BrO3 in the drinking water can be efficiently and rapidly removed.

An antifungus compound 1-(1H-1,2,4-triazole-1-yl)-2-(2,4- difluorophenyl)-3-[N-methyl-N-(4-substituted amino) benzylamino]-2-propanol and its salts, and its preparing process are disclosed. Its advantages are high curative effect, low poison and broad spectrum.

The invention discloses the application of a material for ultraviolet photocatalytic removal of bromate in water. The material is obtained by modifying TiO2 with HF and graphene, and its molecular formula is FxGyT, where x is HF and TiO2. The mass percentage of molecules, y is the mass percentage of graphene oxide and TiO2 molecules. The specific application steps include: adding ultraviolet photocatalytic material for removing bromate in water to an aqueous solution containing bromate pollutants, first adsorbing in a dark state for 0.2 to 1 hour, and then performing ultraviolet irradiation. In the present invention, fluorine (F) and graphene (GR) are co-doped to modify titanium dioxide to obtain a material for ultraviolet photocatalytic removal of bromate in water, which can efficiently remove bromate in water under ultraviolet photocatalysis. The reaction conditions for removing bromate in the present invention are simple, the reaction can be effectively carried out at normal temperature, and the bromate in water can be effectively removed.

The invention provides stabilized concentrated aqueous solutions of alkali hypobromites, as well as a process for the preparation of said stabilized concentrated solutions at low temperatures, comprising reacting a concentrated alkali hydroxide aqueous solution with bromine, adding to the non-stabilized reaction product an aqueous solution of a sulfamic compound to stabilize the hypobromite, and oxidizing bromide to produce additional hypobromite.

The invention discloses a mesoporous gamma-Fe-Ti-Al2O3 catalyst. The catalyst is prepared from the following raw materials of aluminum isopropoxide C6H21AlO3, glucose C6H12O6.H2O, Fe(NO3)3.9H2O, and tetrabutyl titanate (TBOT) aqueous solution. The invention further discloses a preparation method and application of the mesoporous gamma-Fe-Ti-Al2O3 catalyst. The novel mesoporous gamma-Fe-Ti-Al2O3 catalyst can be applied to catalytic ozonation of ibuprofen and blocking of bromate generation, and has remarkable effect.

The invention discloses application of 2-arylmorpholine as shown in the chemical structural formula I or salt thereof serving as an insecticide. The formula I is shown in the specification, wherein, R<2> is chosen from H, OH or OR<1>, and R<1> is chosen from C1-C2 alkyl and C3-C4 linear alkyl or branched alkyl; R<3> is chosen from H, C1-C2 alkyl and C3-C4 linear alkyl or branched alkyl; R<4> is chosen from H, C1-C2 alkyl, C3-C4 linear alkyl or branched alkyl, ethoxyl and benzyl; R<5> is chosen from H, C1-C2 alkyl, C3-C4 linear alkyl or branched alkyl, phenyl or substituted phenyl; Ar is chosen from phenyl, substituted phenyl or 6-methoxy-2-naphthyl; and the salt of the 2-arylmorpholine is chosen from hydrochloride, hydrobromate, sulphate, nitrate or phosphate.

The invention relates to the technical field of pharmaceutical chemicals, and particularly discloses a preparation formula of 4'-bromomethyl-2-cyanobiphenyl. The 4'-bromomethyl-2-cyanobiphenyl is prepared from, by weight, 550-650 parts of an organic solvent, 550-650 parts of water, 190-195 parts of 4'-methyl-2-cyanobiphenyl, 60-85 parts of bromide, 45-55 parts of bromate or chlorate, 150-250 partsof a hydrochloric acid solution and 450-550 parts of a recrystallization solvent. The formula overcomes the defects of the prior art, and has the advantages of mild reaction conditions, high reactionselectivity, fewer byproducts, low equipment corrosion, simple operation, low cost, low environmental protection pressure, easy product separation, safe and easy operation of bromination reagents, high bromine atom utilization rate, easy industrial production and high product purity.

The invention discloses a preparation method of a hot dip galvanizing layer vanadate conversion film. The preparation method comprises the steps: (1) mixing tetrabutyl ammonium fluoride and caprolactam, heating the mixture until the solid is melted completely, then adding water into the mixture, and uniformly mixing the mixture to obtain an ionic liquid aqueous solution; (2) uniformly mixing sodium metavanadate, sodium metaborate, 3-bromopropylamine hydrobromide, N,N-bis(octyhminoethyl)hydrochloride, the ionic liquid aqueous solution and the water, and adjusting the pH value to 2.0-3.0 by using a hydrochloric acid solution to obtain a conversion solution; and (3) degreasing, washing and drying a hot dip galvanizing plate, spraying ammonia water on the surface of the hot dip galvanizing plate, and after reacting for 5-10 min, immersing the hot dip galvanizing plate in the conversion solution, and washing and drying the hot dip galvanizing plate after conversion treatment to obtain the finished product. The prepared vanadate conversion film is compact and flat in surface, and excellent in quality and corrosion resistance.

The invention discloses a synthesis method of 2, 4, 6-tribromophenol, which comprises the following steps: dissolving phenol and metal bromide in water to obtain a mixed solution of phenol and metal bromide, and recording the mixed solution as a first mixed solution; dropwise adding a bromate solution and hydrochloric acid into the first mixed solution for reaction; and after the reaction is finished, adding sodium sulfite into the reaction liquid until the light brown color in the reaction liquid completely disappears, filtering, washing and drying to obtain the 2, 4, 6-tribromophenol. According to the synthesis method disclosed by the invention, the bromide salt is used as a bromine source, so that available resources are fully utilized, and the use of an organic solvent is avoided; after the reaction is finished, a crude product is separated out in a water phase, and a product with enough purity is obtained after simple filtering treatment; according to the process method, the production cost is greatly reduced, meanwhile, potential safety hazards in transportation and production are reduced, and the working environment is improved.

The invention belongs to the technical field of preparation of drug intermediates, and particularly relates to a preparation method of o-carboxybenzaldehyde. The method comprises the following steps:a crude o-carboxybenzaldehyde product preparation step: taking phthalide as a raw material, carrying out bromination reaction under the action of a bromination reagent and an initiator to obtain 3-bromophthalide, and then carrying out hydrolysis reaction to obtain a crude o-carboxybenzaldehyde product; salifying and purifying, namely adjusting the solution of the o-carboxybenzaldehyde crude product to be weakly alkaline by using inorganic base, filtering to obtain a filter cake, dissolving the filter cake, adjusting the pH value to be acidic, cooling, crystallizing and filtering to obtain o-carboxybenzaldehyde; wherein the bromination reagent is tetrabromo cyclic ketone, dibromohydantoin, NBS, pyridine hydrobromide over-bromide, over-bromo quaternary ammonium salt or quaternary phosphoniumsalt. The preparation method of o-carboxybenzaldehyde provided by the invention is low in pollution, mild in condition, high in safety, high in product purity and yield, and suitable for industrial production.

The invention belongs to the technical field of photocatalyst, and discloses a molybdenum disulfide / formamidinium lead bromate composite photocatalyst, and a preparation method and applications thereof. The preparation method comprises following steps: with magnetic stirring, a formamidinium lead bromate precursor solution is added into a molybdenum disulfide dispersion liquid drop by drop, a toluene solution is added, and at last vacuum drying is carried out; wherein the formamidinium lead bromate precursor solution is prepared through mixing of lead bromide, formamidinium bromide, and N , N-dimethyl formamide and ultrasonic treatment until complete dissolving; the molybdenum disulfide dispersion liquid is prepared through following steps: molybdenum disulfide is added into N, N-dimethylformamide for ultrasonic treatment, and then centrifugation processing of an upper layer solution is carried out, and the upper layer solution is subjected to gas introduction treatment, wherein the adopted gas is nitrogen gas or argon gas. The molybdenum disulfide / formamidinium lead bromate composite photocatalyst is wide in visible light response ranges, high in light adsorption capacity, possesses excellent photocatalytic activity, and can be adopted in benzyl alcohol photocatalytic oxidation.

The invention relates to a hydrogen matrix biofilm reactor for removing bromate (BrO 3 ‑ ), belongs to the field of water purification technology. In the application of the hydrogen matrix biofilm reactor provided by the present invention in the removal of bromate in drinking water, the hydrogen matrix biofilm reactor includes a cylinder body, a return system, an inlet and outlet water piping system and a hydrogen supply system; the cylinder The center of the body is equipped with a hollow fiber membrane as the attachment carrier of the biofilm, and the two ends of the hollow fiber membrane are fixed at both ends of the cylinder; the hollow fiber membrane is connected to the hydrogen supply system, and hydrogen enters the hollow fiber membrane from the top of the reactor. , diffuse from the inner layer of the hollow fiber membrane of the membrane to the outer layer in a bubble-free manner, discharge into the cylinder, and then discharge from the water outlet. The application provided by the invention is simple and safe to operate, and can realize the treatment of BrO in drinking water 3 ‑ Efficient and fast removal.

The invention relates to a fast detection method of bromate in bread. The fast detection method comprises the following steps of: (1) preparing liquid A and liquid B, wherein the liquid A is a hydrochloric acid solution and the liquid B is a 1% of potassium iodide solution; (2) mixing the liquid A and the liquid B with equal volumes, putting the mixture into a test tube and adding a crushed bread sample; and (3) observing the color after 1-2 minutes, and if the light purple or purple or purple blue exists, showing that the potassium bromate exists. The fast detection method has the advantages that the cost is low, the operation is convenient, the sample detection can be finished for 10 minutes, and the quantitation is fast and accurate; and the applicability to site and fast detection is achieved, the anti-counterfeiting purpose on site and a home test of consumers are met to ensure the safety and the reassurance of foods, and an effective and fast monitoring means is provided for market supervision. The fast detection method has important practical significance on the aspects of facilitating the effective supervision on the quality of a bread product, protecting the benefit of the consumers and the like.

The invention discloses a preparation method of hordenine hydrochloride. The preparation method comprises the following steps: taking 4-(2-bromoethyl)phenol as a raw material, adding ethanol to prepare a solution, dropwise adding excessive dimethylamine solution, and stirring at a lower temperature to carry out amination reaction to obtain hordenine hydrobromide. The proper excessive dimethylamine is adopted, so that the quaternization side reaction is effectively inhibited, the solvent dispersion effect is also played, the contact reaction opportunity of the hordenine product generated in the first reaction and the 4-(2-bromoethyl)phenol added later is greatly reduced, the high product yield can be kept, and meanwhile the low preparation cost is achieved; 4-(2-bromoethyl) phenol is added into ethanol to prepare a dilute solution of ethanol, and the dilute solution of ethanol is dropwise added into a dimethylamine solution to improve the dispersity of 4-(2-bromoethyl) phenol in a reaction system and inhibit quaternization side reaction; and the amination reaction is carried out by stirring at a relatively low temperature of 10-25 DEG C, so that the occurrence of quaternization side reaction is inhibited, and a relatively good reaction effect is achieved.

The invention discloses a material for removing bromate and precursors thereof in water, and a preparation method and application thereof. The method comprises the following steps: (1) in a nitrogen protective atmosphere, swelling resin in a FeCl3.6H2O ethanol-water mixed solution, then adding a FeCl2.4H2O ethanol-water mixed solution, performing mixing with stirring, and then performing ultrasonic treatment, so that Fe<3+> and Fe<2+> are uniformly distributed in macropores of the resin; (2) in the nitrogen protective atmosphere, dropwisely adding a sodium hydroxide solution into the mixed solution obtained after the ultrasonic treatment in the step (1), performing a stirring reaction, and performing heating to 60-65 DEG C for a further reaction; and (3) after the reaction is completed, performing cooling to room temperature, performing filtration, performing washing, and performing drying to obtain magnetized resin which is the material for removing bromate and precursors thereof in water. The magnetized resin is applied to removal of bromate and precursors thereof in water; and the material can be recycled for a long time, and has the advantages of high removal efficiency, high separation speed and the like.

The invention discloses a preparation method of (E)-2, 3-dibromo-2-butene-1, 4-diol. The method consists of the steps of: (1) preparing an aqueous solution of the mixture of 2-butyne-1, 4-diol, a bromide and a bromate; (2) adding dilute sulfuric acid into the aqueous solution of the mixture dropwise at certain temperature, then further carrying out reaction for 10-120min, and then ending the reaction; and (3) conducting pumping filtration, recrystallization, drying and other steps on the reaction product, thus obtaining a white (E)-2, 3-dibromo-2-butene-1, 4-diol crystal. The method provided by the invention has the advantages of low cost, simple operation, safety, environmental protection, high selectivity, few by-product, high yield, etc.

The present invention relates to the technical field of drinking water, more specifically, to a method for producing fresh and healthy drinking water, comprising: delivering the source water to a water treatment workshop; Water tank; ultraviolet rays are used for the first sterilization; the effluent after the first sterilized treatment is filtered for the second time to remove the second solid particles; it flows into the antibacterial membrane system for the third filtration; the effluent treated by the third filtration flows into the middle Water tank; the second sterilization is carried out by ultraviolet light; the effluent after the second sterilizing treatment is sterilized for the third time by means of cold and hot exchange; the effluent water after the third sterilization treatment flows into the finished water tank and waits for filling. The source water of the present invention is transported to the workshop through a closed pipeline without aeration process and ozone sterilization process, effectively removes particles and microorganisms in the source water, strictly controls bromate and nitrite in the effluent, and obtains fresh and healthy product effluent.

The invention relates to a chloride ion fluorescent probe with fast response time and high selectivity, a preparation method and application thereof. The molecular formula of the fluorescent probe molecule is: C 19 h 21 N 2 o 3 S + , the structural formula is shown in formula 4. Dissolve 6‑methoxyquinoline in C 2 h 5 OH to obtain the first solution, 3‑bromopropylamine hydrobromide dissolved in CH 3 The second solution was obtained in CN; the above two solutions were mixed and heated to a reaction temperature of 75-85°C, the crude product obtained after the reaction was purified and separated, and the compound and benzenesulfonyl chloride obtained were dissolved in dichloroethane, and the reaction was completed with stirring After separation and purification, the target probe compound was obtained. The invention realizes the selective rapid detection of the chloride ion molecular probe, has good selectivity and strong anti-interference ability of other molecules. In addition, the color change of the solution can be observed with the naked eye, and the fluorescence color change can also be observed under the ultraviolet light. Formula 4.