330 results about "Bromide ions" patented technology

Disclosed is a method of preparing a biocide having improved durability of its biocidal activity as well as disinfection efficiency at an initial stage, comprising the steps of: (a) preparing stabilized alkali or alkaline earth metal hypochlorite having a pH at least 11 by mixing a chlorine oxidant including alkali or alkaline earth metal hypochlorite with a stabilizer in an alkali solution; (b) preparing a bromide ion source; and (c) adding the bromide ion source prepared in step (b) into the stabilized alkali or alkaline earth metal hypochlorite prepared in step (a). Also, a method of controlling the growth of microorganisms using a biocide prepared by the method of the present invention is disclosed.

The invention discloses a preparation method for an ionic-liquid-modified carbon quantum dot. The preparation method comprises dissolving citric acid and aminoimidazolium bromide in ultrapure water, and dewatering to obtain a gelatinoids, then stirring and refluxing, adding ultrapure water for once-more dispersing after cooling, and then dialyzing for 2-3 days, and drying to obtain a carbon quantum dot of which the anion is bromide ion; dissolving the carbon quantum dot in ultrapure water, introducing a specific anion (such as N(CF3SO2)<2->) and an oil phase (such as ethyl acetate) into the carbon-quantum-dot-dissolved ultrapure water, so as to enable the carbon quantum dot to have anion exchange and be transferred from the ultrapure water phase to the oil phase, and separating the oil phase, so as to obtain the carbon quantum dot of which the anion is N(CF3SO2)<2->; and continuing introducing other anions(such as Cl<->), so as to enable the carbon quantum dot to be transferred into the ultrapure water phase from the oil phase. Through once or multitime phase transfer and separation of the oil phase and the ultrapure water phase, a series of high-purity carbon quantum dots which contain different anions and are adjustable in dissolvability and fluorescence property are obtained.

The invention relates to a method for preparing high-purity tetrabutyl ammonium hydroxide by continuous electrolysis, particularly relates to a method for preparing high-purity tetrabutyl ammonium hydroxide by using tetrabutyl ammonium bromide as a raw material and adopting a three-compartment bipolar membrane electrodialysis device, and belongs to the field of organic chemistry. The method is characterized by comprising the following step: by adopting the three-compartment bipolar membrane electrodialysis device, continuously preparing 5-20% tetrabutyl ammonium hydroxide by using a 15-35% tetrabutyl ammonium bromide aqueous solution as a raw material under the condition that the reaction temperature is 30-60 DEG C, the current density is 200-600A/m<2> and the flow rate of the raw materials is 500-2000L/h, wherein the concentration of bromine ions in the prepared tetrabutyl ammonium hydroxide is less than 100ppm. According to the method provided by the invention, the materials in the compartments are relatively constant in concentration, the temperature is relatively constant, an ionic membrane is not easy to swell or shrink, the membrane cost is saved, the current efficiency and the product conversion ratio are improved and the energy consumption is reduced, and moreover, the product quality is further improved. The method is suitable for industrial safe production on a large scale, clean in production process and free of discharge of wastewater and solid wastes.

The invention relates to a preparation method of a fluorescent molecular probe for detecting fluoride ions in aqueous solutions through fluorescence enhancement and an application of the fluorescent molecular probe to detecting fluoride ions. The fluorescent molecular probe is prepared by protecting 1,4-diethyl-1,2,3,4-tetrahydro-7-hydroxyquinoxaline-6-aldehyde taken as a raw material with silane and then condensing the raw material and malononitrile. The fluorescent molecular probe is simple and convenient to synthesize, and reaction conditions are mild. The fluorescent molecular probe has the specific characteristics that the probe molecule has stable optical properties and higher synthetic yield; the probe molecule has high sensitivity of detection of fluoride ions in the aqueous solutions and low lower limit of detection, and the limit of detection is 5.4mu M; the response range is 0-1mM and the detection range is wide; the probe molecule has good selectivity and has no responses to anions, such as chloride ions, bromide ions, iodide ions, tetrabutylammonium cyanide, nitrates radicals, hydrosulfate radicals, perchlorate radicals, acetate radicals, thiocyanate radicals, azide radicals, cysteine, bovine serum albumin, carbonate radicals, sulfate radicals and reduced glutathione; the fluorescent molecular probe has practical application values in the fields of biochemistry, environmental sciences and the like.

The invention discloses a preparation method of aquacide dichloride. Bromide ions are oxidized by taking an aquacide dibromo salt aqueous solution as a raw material and taking chlorine as an oxidant to generate bromine and aquacide dichloride, wherein bromine is recycled by distillation and condensation; residual bromine and chlorine are purged by introducing air, oxygen, water vapor or inert gas to obtain aquacide dichloride. According to preparation of the aquacide dichloride, the aquacide dichloride is obtained by taking the aquacide dibromo salt aqueous solution as the raw material and by oxidizing by cheap chlorine, so that the preparation method of aquacide dichloride has the advantages of low production cost, simple reaction and high product yield, and is suitable for industrialized production. More importantly, expensive bromine is obtained by replacement, and bromine is a chemical raw material applied widely, can serve as a product to be sold directly and can also be circularly used for preparation of aquacide dichloride, so that the problem that existing herbicide aquacide has high production cost is solved and significant economic benefit is achieved.

The present invention relates to a process for electrochemical oxidation of bromide to bromine, more particularly to oxidation of bromide ions in brine, bittern and effluents using an indigenous cation exchange membrane flow cell.

The invention discloses a method for extracting bromine by industrial wastewater rich in Br-, and is characterized in that bromine is obtained by electrochemical oxidation, blow-out, and collection of industrial wastewater which is pretreated by purification and is rich in Br-; in the electrochemical oxidation, an electrolytic tank is partitioned into a cathode chamber and an anode chamber by an ion exchange membrane; the anode electrolyte is an aqueous solution which is rich in Br- and is obtained by purification treatment of the industrial wastewater rich in Br-; the cathode electrolyte is an acid solution with a pH of 1-4; the temperature of the electrolytes is controlled at 25-45 DEG C; the current density is 0.01-0.1 A/cm2; or a constant voltage is 0.5-6.0 V; after electrolytic balance is reached, the anode electrolyte is removed, and bromine is obtained by air blow-out, condensation, gas-liquid separation, and water-bromine separation. The method of the invention overcomes the disadvantages of bromine preparation by traditional oxidation process through chlorine, hypochlorite, and the like; the method is applicable to the treatment of industrial wastewater with a bromide ion concentration of 0.02-11.5 mol/L, and the process is simple and environment-friendly.

The present invention relates to an etching liquid composition for a copper/molybdenum or a copper/molybdenum alloy film. As for the overall weight of the composition which is of 100% weight, the etching liquid composition contains 5-40% weight of hydrogen peroxide, 0.1-5% weight of an etching inhibitor, 0.1-5% weight of a chelating agent, 0.1-5% weight of an etching additive, 0.01-2% weight of fluoride, 0.01-2% weight of a hydrogen peroxide stabilizer, and 0.1-5% weight of a bromide ion compound, the balance being water. The bromide ion compound is a bromine inorganic acid salt, a nitride bromide, a sulfide bromide, a bromine fluoride, a bromine chloride or a mixture thereof. When etching is repeatedly performed and thus the content of metal ions in the etching liquid is high, with adoption of the etching liquid composite, the etching characteristics such as the etching taper angle, etching deviation and etching straightness are maintained, and the composition can also be used as a lower film and applied to TFT-LCD display electrode manufacture.

The invention discloses a device and method for recycling bromine from bromine containing waste water. The method comprises the following steps that a, pre-treated bromine containing waste water is led into an electrolysis device, direct current passes through the bromine containing waste water in the electrolysis device, and bromide ions have the electrolytic reaction to generate elemental bromide; b, an extraction agent and an electrolyzed water solution make contact, and the elemental bromide is recycled from an extraction phase; c, the extracted water phase is subjected to steam stripping,the extraction agent is recycled, and then the water phase enters a subsequent waste water treatment unit. The oxidizing agent safety problem brought by a traditional oxidation method can be solved.The recycled molecular bromine can directly return to the system to be applied, the bromine consumption is reduced. The high-added-value hydrogen resources can be recycled.

The invention discloses a device and a method for preparing high-purity tetrapropylammonium hydroxide and co-producing bromine through electrolysis. The method comprises the following steps: pumping and putting a tetrapropyl ammonium bromide solution of which the mass concentration is 45-55% in a raw material circulation tank into an anode chamber, meanwhile blowing air into the anode chamber through an air compressor, dehydrating the tetrapropyl ammonium bromide in the anode chamber to generate cation (CH3CH2CH2)4N<+> and anion Br<->, feeding the cation into a cathode chamber through a cation exchanger membrane, feeding the anion to an anode plate to generate gas phase bromine, feeding the gas phase bromine together with diluted tetrapropyl ammonium bromide into a gas-liquid separator for gas-liquid separation, feeding the diluted tetrapropyl ammonium bromide in the gas-liquid separator and separated liquid bromine into two bromine settling tank for switching and settling, mixing the diluted tetrapropyl ammonium bromide which contains a small amount of bromine at an upper layer with concentrated tetrapropyl ammonium bromide which is discharged from a concentrated tetrapropyl ammonium bromide tank into tetrapropyl ammonium bromide of which the mass concentration is 45-55%, and feeding the tetrapropyl ammonium bromide into the raw material circulation tank for further recycling and use, wherein the ionic concentration of the tetrapropylammonium hydroxide is less than 100ppm, and the content of metal ions is less than 20ppb.

The invention provides a method for treating profenofos synthetic wastewater. A certain amount of chlorine is led into the wastewater produced in the synthesis process of profenofos, bromide ion in the wastewater is replaced by bromine and trimethyl ethyl ammonium chloride is generated, the generated bromine is separated with the wastewater, and then the wastewater after the bromine is separated is used for preparing the trimethyl ethyl ammonium chloride. The method can be used for treating the waste water produced in the synthesis process of the profenofos to recover valuable resource, thereby having better social and economic benefits.

The invention provides a system and method for preparing high-purity tetrapropylammonium hydroxide through an electrolysis method. A 5wt%-25wt% tetrapropylammonium bromide solution serves as a raw material, a two-membrane three-chamber electrolyzer is adopted, tetrapropylammonium bromide in a middle chamber is dissociated to generate (CH3CH2CH2)4N+ and Br-, the cation (CH3CH2CH2)4N+ selectively penetrates a cation exchange film to form tetramethyl ammonium hydroxide together with hydroxyl in a cathode chamber; and the anion Br- selectively penetrates an anion exchange membrane to enter the cathode chamber to be oxidized to generate bromine, the bromine then reacts with ammonium hydroxide to generate ammonium bromide and nitrogen, and a 5wt%-15wt% high-purity tetrapropylammonium hydroxide solution is prepared through continuous current electrolysis according to a continuous or discontinuous method. The electrolysis process overcomes the defect that a product produced through an ion exchange method contains sodion, the beneficial effects of being low in energy consumption, high in product purity and high in current efficiency are achieved, and the bromide ion content in the product is smaller than 50 PPM.

A apparatus and method for killing microorganisms in a body of water that has been treated with ozone in the presence of bromide ions with the method comprising the steps of carrying out the ozonization of a body of water in the presence of bromide ions, adding a metal ion donor to the body of water, and adding a hypobromite ion scavenger to the body of water to interact with the metal ion donor to enhance a metal ion concentration in the body of water while suppressing the oxidization of the bromide by the Ozone to produce bromate.

The invention relates to a preparation method of a fluorescent molecular probe for detecting fluoride ions through colorimetric detection and fluorescence enhancement and an application of the fluorescent molecular probe to detecting fluoride ions. The fluorescent molecular probe is prepared by protecting 2-hydroxyl-1-naphthaldehyde taken as a raw material with silane and then condensing the raw material and malononitrile. The fluorescent molecular probe is simple and convenient to synthesize, and reaction conditions are mild. The fluorescent molecular probe has the specific characteristics that the probe molecule has stable optical properties and higher synthetic yield; the probe molecule has high fluoride ion detection sensitivity and low lower limit of detection, and the limit of detection is 0.52mu M; the response range is 0-100mu M and the detection range is wide; the probe molecule has good selectivity and has no responses to anions, such as dihydrogen phosphate radicals, acetate radicals, bromide ions, hydrosulfate radicals, chlorate radicals, iodide ions, chloride ions and nitrate radicals; the probe molecule is suitable for colorimetric detection; the fluorescent molecular probe has practical application values in the fields of biochemistry, environmental sciences and the like.

The invention relates to the field of nano material synthesizing and application and aims at providing a method for large-batch synthesizing and high-efficiency purifying of superfine silver nano wires. The method includes the steps that polyvinylpyrrolidone and AgNO3 are added into glycol under the stirring condition and are evenly mixed and dissolved; a chloridion halogeno salt-ethylene glycol solution and a bromide ion halogeno salt-ethylene glycol solution are added continuously, and a reaction is carried out in the N2 atmosphere; supernatant liquor is taken centrifugally, acetone is addedunder the stirring condition, and standing is conducted so that flocculent solids can be deposited; ionized water is used for dispersing, and a uniform dispersion solution is formed; and acetone is added under the stirring condition, and the adding action is stopped when flocculent solids occur again, the operation is repeated for 6 times to 10 times, and the high-purity superfine silver nano wires are obtained. By means of the method, the processes of Ag crystal nucleus forming, crystal growth and the like can be controlled, and large-batch and stable preparing of the superfine AgNWs is achieved. Large-particle-size nano particle impurities are removed completely, and small-particle-size nano particles are separated from the AgNWs; the prepared silver nano wires do not have silver nano particle impurities, and the purity is nearly 100%; and the diameter of the silver nano wires is smaller than or equal to 40.0 nm.

The present invention relates to a process for electrochemical oxidation of bromide to bromine, more particularly to oxidation of bromide ions in brine, bittern and effluents using an indigenous cation exchange membrane flow cell.

The invention relates to a method for extracting bromine from bromine-containing wastewater, which comprises the following steps: pretreatment: filtering the bromine-containing wastewater so that the turbidity of the filtered bromine-containing wastewater is lower than the preset value; acidification: adding hydrochloric acid or sulfuric acid into industrial wastewater containing bromide ions to adjust the pH value of the industrial wastewater to 3-5; oxidation: adding an oxidizing agent into the acidified industrial wastewater for oxidation to generate bromine; extraction: adopting n-dodecane as an extraction agent, and extracting bromine from an aqueous phase to an n-dodecane phase; liquid separation: performing liquid separation on the two-phase solution added with the extraction agent, wherein the upper layer is an oil phase, and the lower layer is an aqueous phase; separating the aqueous phase from the oil phase; rectification: rectifying the n-dodecane and bromine solution obtained by the liquid separation so that bromine is separated from n-dodecane to obtain a bromine product. In the method provided by the invention, bromine is extracted by a solvent extraction process; compared with the traditional technology, the use of steam is greatly saved, the cost of whole bromine extraction is remarkably reduced, and better economic benefits are obtained.

The invention relates to a method for controlling the formation quantity of bromate in an ozone oxidation process of drinking water by introducing a nano TiO2 catalyst, which avoids negative effects brought to the safety and the reliability of the drinking water of the traditional method for controlling the bromate by adding chemical drugs. According to the method, settled water treated by a conventional method is directly filled into a nano TiO2 catalyst bed for ozone contact and catalytic ozone oxidation, or after the settled water is subjected to ozone contact and catalytic ozone oxidation in a primary nano TiO2 catalyst bed, water still containing ozone is filled into a secondary nano TiO2 catalyst bed for carrying out a catalytic reaction, wherein the contact oxidation time is 10-20min. The method has the advantages that the nano TiO2 has obvious efficiency of reducing the formation quantity of the bromate in the ozone oxidation process and also has obvious control efficiency to the formation quantity of the bromate in the ozone oxidation process of water with high bromide ion concentration, the formation potential to trihalomethane and the reduction efficiency to DOC of individual ozone oxidation can be improved, and other toxic and side effects cannot be caused to the quality of the drinking water.

The invention provides a method for measuring bromide ions and iodide ions simultaneously. According to the method, the bromide ions and the iodide ions in water are simultaneously measured by a dual-wavelength spectrophotometry according to optical adsorption properties of ultraviolet regions of the bromide ions and the iodide ions; an analysis process is simple and quick; the measurement cost is low; the method disclosed by the invention can be used for simultaneous and quick measurement of trace bromide ions and trace iodide ions in systems such as seawater, river water, lake water, underground water, drinking water and bittern.

The invention discloses a method and a system for treating electronic scrap smoke. The method comprises the following steps: (1) performing countercurrent contact between smoke and absorption liquid so as to obtain purified smoke and absorbed liquid; (2) filtering the absorbed liquid so as to obtain filtrate and filter residue; (3) mixing the filtrate with a heavy metal capture agent, and performing concentration treatment so as to obtain supernatant and filter residues containing heavy metals; (4) introducing chlorine into the supernatant, oxidizing bromide ions in the supernatant into molecular bromine, so as to obtain a reaction solution containing the molecular bromine; (5) distilling the reaction solution containing the molecular bromine so as to obtain bromine-containing gas; and (6) condensing the bromine-containing gas so as to obtain a bromine product and mixed gas. According to the method, the electronic scrap smoke can be effectively purified, the purified smoke can meet the national environmental protection standard, the bromine element can be efficiently recovered, the bromine extraction rate is over 90 percent, and the purity of the bromine product is over 99 percent.