245 results about "Bromide ions" patented technology

The utility model belongs to the technical field of bromine extraction electrolytic baths, and particularly relates to a series-parallel connection combined bromine extraction electrolytic bath and bromine extraction equipment. The electrolytic bath is packaged and formed through a bath body packaging structure, an electrolytic ion membrane is arranged in the middle of the interior of the electrolytic bath, the electrolytic bath is divided into a cathode chamber and an anode chamber through the electrolytic ion membrane, and electrolytic plates are arranged on the two sides of the electrolytic ion membrane; a cathode water inlet pipe is arranged in the middle of the cathode chamber, a cathode gas outlet pipeline is arranged at the top, and a cathode liquid outlet pipeline is arranged at the bottom; an anode gas outlet pipeline is arranged at the top of the anode chamber; and an anode liquid outlet pipeline is arranged at the bottom. The electrolytic cells can be connected in series or in parallel, bromide ions with different concentrations can be treated, and the treatment capacity can be adjusted according to the water volume; the problem of enrichment of hydrogen in the electrolytic bath is solved, and the pressure in the electrolytic bath is balanced; the function tank achieves the effects of gas-liquid separation, temperature control and water inlet adjusting and buffering.

The invention relates to a method for extracting bromine from a bromine-containing water sample through electrooxidation, in particular to a method for extracting bromine from brine containing various impurity ions, especially high-concentration Cl <-> ions and low-concentration Br <-> ions, which is mainly used for reducing the interference of the Cl <-> ions and improving the recovery rate of the Br <-> ions by selecting a proper oxidation potential. The process is used for optimally selecting the oxidation potential of bromine ions so as to achieve high-recovery-rate bromine extraction, and comprises the following steps: 1) adjusting the pH value of a bromine-containing water sample to be acidic; 2) carrying out electrochemical oxidation on the bromine-containing water sample subjected to acid adjustment to convert bromine ions into bromine gas; and 3) blowing the generated bromine gas to the absorption device through the aeration device. The hydrogen bromide solution is introduced to adjust the pH of the absorption product solution to be acidic, so that bromate is converted into bromide, and finally, a high-quality sodium bromide product can be obtained.

The invention discloses nanoscale bismuth hydroxide as well as a preparation method and application thereof. The invention provides a preparation method of bismuth hydroxide. The preparation method comprises the following steps: reacting a mixture solution of a surfactant solution and a bismuth source solution at the temperature of 100-300 DEG C and the pressure of 0.5-5 MPa to obtain bismuth hydroxide, the pH value of the mixture liquid is 5-12; the bismuth source is bismuth nitrate; the surfactant is selected from polyvinylpyrrolidone or hexadecyl trimethyl ammonium bromide. According to the preparation method, bismuth hydroxide with the microscopic primary particle size of about 40-90 nm, uniform distribution, the secondary particle size D99 of 2-4 microns, the purity of 99.9% and the particle size of more than 99.9% can be obtained, and the adsorption rate of bismuth hydroxide to bromide ions and iodide ions reaches 80% or more.

The invention relates to the technical field of redox flow batteries, in particular to an all-vanadium redox flow battery electrolyte based on bromo-hydrochloric acid and application of the all-vanadium redox flow battery electrolyte. The electrolyte comprises vanadium ions, hydrogen ions, bromide ions and chloride ions, wherein the molar concentration ratio of the chloride ions to the bromide ions is greater than or equal to 2; and the volume ratio of the positive electrode electrolyte to the negative electrode electrolyte is (0.5-0.95): 1. According to the electrolyte disclosed by the invention, on the basis of fully utilizing the capacity provided by vanadium, the capacity provided by bromine is effectively utilized through participation of bromine ions in an electrochemical reaction, so that the capacity of the all-vanadium redox flow battery is improved, and meanwhile, the energy cost is reduced; the electrolyte can improve the high-temperature stability of the all-vanadium redox flow battery.

The invention discloses polylactic acid polyol as well as a preparation method and application thereof. The preparation method comprises the following steps: performing a heating reaction on zinc salt, organic ammonium salt and bis (ethylene carbonate) ether to prepare an in-situ catalyst; anions of the organic ammonium salt are selected from any one of bromide ions, chloride ions and iodide ions; and adding a lactide monomer, and carrying out polymerization reaction to obtain the polylactic acid polyol. The polylactic acid polyol prepared by the invention has a flexible chain segment, can provide better flexibility, and can be applied to preparation of a polyurethane material.

The invention provides a synthesis method of a bromide ion adsorbent for salt lake bromine extraction, and belongs to the technical field of adsorbent preparation, a mixed solution of strontium chloride and manganese chloride and a mixed solution of sodium phosphate and sodium hydroxide are subjected to precipitation reaction to obtain A-Sr4Mn6 (PO4) 6 (OH) 2; the preparation method comprises the following steps: reacting A-Sr4Mn6 (PO4) 6 (OH) 2 with a sodium bromide solution to obtain B-Sr4Mn6 (PO4) 6Br2; and reacting the B-Sr4Mn6 (PO4) 6Br2 with a sodium hydroxide solution to obtain Sr4Mn6 (PO4) 6 (OH) 2, namely the bromide ion adsorbent. The prepared adsorbent can selectively adsorb bromide ions from high-salt brine, and has the advantages of high adsorption capacity, high selectivity, high recyclability and the like; in brine with extremely high chloride ion concentration, low-concentration bromide ions can be selectively adsorbed without being influenced by high-concentration chloride ions; in a high-salt water body, the adsorption capacity on bromide ions is higher; the selective adsorption separation of the chloride ions and the bromide ions is realized.

The invention discloses a two-phase electrolyte, a preparation method thereof and a liquid energy storage battery system, and belongs to the technical field of electrochemical energy storage. According to the invention, a liquid-liquid double-phase electrolyte is composed of a water-phase electrolyte and an organic-phase electrolyte, wherein the organic-phase electrolyte contains a coupling system of 1-(methyl-decyl)-3-methylimidazolium bromide, tris (methyl-decyl) methyl ammonium bromide and (10-octadecyl) alkyl trimethyl ammonium bromide in a molar ratio of (5-7): (2-4): 1. During charging, positive electrode bromide ions are subjected to an oxidation reaction to generate a bromine simple substance, and meanwhile, the bromine simple substance and a coupling system of the quaternary ammonium bromide compound and the bromine complexing agent provided by the invention form a stable polybromine complex product, so that the polybromine complex product is prevented from being migrated into a water-phase electrolyte, and the purpose of improving the stability of the water-phase electrolyte in the absence of a diaphragm is achieved. The self-discharge reaction of bromine is significantly inhibited at a high temperature exceeding the boiling point temperature of bromine, the coulombic efficiency and energy efficiency of the liquid energy storage battery are improved, the system cost is reduced, and the long-term cycle stability of the liquid energy storage battery is improved.

The invention relates to the technical field of flow batteries, in particular to a bromine-chromium flow battery electrolyte and a flow battery. The electrolyte is composed of a basic electrolyte and an additive; the additive is an iodine elementary substance or an iodine-containing compound; the basic electrolyte comprises bromide ions, chromium ions and hydrogen ions; the molar concentration ratio of iodine to bromide ions in the electrolyte is (1: 8)-(1: 4), one or two of iodine elementary substances or iodide ions are used as additives, the bromide ions and the iodine elementary substances are complexed in the charging process to form I2nBr <-> to exist in the electrolyte, then the I2nBr <-> generates the bromine elementary substances through an electrochemical reaction, and the electrochemical reaction electrode potential (Egt) of I2nBr <->-Br2; the electrode potential (E = 1.0873 V vs.SHE) is higher than the electrode potential (E = 1.0873 V vs.SHE) of Br <->-> Br2, so that the energy density of the bromine-chromium flow battery is improved.

The main object of the present invention is to provide an organic EL display that has excellent light emission characteristics to enable low voltage driving and has light emitting elements with high reliability, thereby serving to realize a desired current density. Provided is a display device including a substrate, a first electrode, a second electrode, a pixel separation layer, and an organic layer containing a light emitting layer, wherein the pixel separation layer contains a colorant (D-DL), has an optical density of 0.5 to 3.0 in the visible light wavelength range per μm of the thickness of the pixel separation layer, and has a plurality of pixel parts in a plan view. The detection intensity of the sulfur ion (S−), the detection intensity of the chlorine ion (Cl−), the detection intensity of the bromine ion (Br−), and the sum of the detection intensity of the chlorine ion (Cl−) and the detection intensity of the bromine ion (Br−), all measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep in each pixel part from the surface of the first electrode, the surface being in contact with the organic layer containing a light emitting layer, satisfy relationships represented by specific general formulas.

A preparation method for passivating an inorganic perovskite solar cell based on an S-(2-aminoethyl) isothiourea bromine onium hydrobromide field is characterized in that S-(2-aminoethyl) isothiourea bromine onium hydrobromide is used as a passivation material to be applied to the surface of an inorganic perovskite thin film, and a uniform passivation layer is formed on the surface of perovskite; the electric field distribution between the perovskite layer and the electron transport layer is significantly improved, the separation and transport of carriers are promoted, and non-radiative recombination is inhibited. Amino groups and thiourea groups in S-(2-aminoethyl) isothiourea bromine onium hydrobromide molecules can form stable coordinate bonds with uncoordinated lead ions on the surface of perovskite, so that the S-(2-aminoethyl) isothiourea bromine onium hydrobromide molecules are effectively anchored on the surface. Meanwhile, bromine ions in the S-(2-aminoethyl) isothiourea bromide onium hydrobromide can fill halogen vacancies in perovskite crystal lattices, so that the defect density is further reduced. And the interface characteristic between the perovskite and the electron transport layer is obviously improved, so that the photoelectric conversion efficiency and the stability of the cell are improved.

The invention discloses a zinc-bromine flow battery modified diaphragm which comprises a base diaphragm and a modified layer, the component of the modified layer is dopamine hydrochloride, and a preparation method of the zinc-bromine flow battery modified diaphragm comprises the following steps: S1, preparing a dopamine hydrochloride solution; s2, preparing a modified diaphragm: soaking the base membrane in a dopamine hydrochloride solution, adding a buffer solution, standing, and drying to obtain the modified diaphragm. The hydrophilicity of the diaphragm is improved by using dopamine through a bionic method, alkaline dopamine is very easy to infiltrate through a simple and controllable reaction process, a modified membrane is successfully prepared from a base membrane, the method keeps the original high mechanical property and acid-base stability of the base membrane, the hydrophilicity of the surface of the base membrane is remarkably enhanced, and the service life of the membrane is prolonged. In addition, some dopamine hydrochloride molecules are immersed into holes to reduce the average pore size of the film, so that the free shuttling of bromide ions is effectively inhibited.

The invention discloses a PTA wastewater ozone-biochemical coupling deep treatment method for inhibiting bromine oxidation. The method comprises pretreatment, pre-ozone oxidation-biological membrane coupling treatment, secondary coagulating sedimentation, post-ozone-BAC filter coupling treatment and an online monitoring control system. According to the process, ozone oxidation is limited in a direct oxidation stage by controlling the ozone dosage and optimizing the reflux ratio, so that oxidation of bromide ions is reduced to the greatest extent while the biodegradability of the wastewater is improved. The front ozonation unit and the rear ozonation unit both adopt high reflux ratio design, so that the direct contact concentration of ozone and raw water is reduced. The online monitoring control system adjusts the ozone adding amount and the reflux ratio in real time, so that the treatment effect is ensured, and meanwhile, generation of bromate is inhibited. The process can effectively remove refractory organic matters and ammonia nitrogen in the PTA wastewater, meanwhile, the bromate content is controlled at a lower level, and the process has a good treatment effect, economical efficiency and environmental friendliness.

The invention relates to a multifunctional mixed electrolyte for high-magnification long-cycle multi-electron reaction. The electrolyte is an aqueous electrolyte containing zinc salt, iodized salt and bromine salt; wherein the molar concentration of the zinc salt is 1-3 M, the molar concentration of the iodized salt is 0.1-1 M, the molar concentration of the bromine salt is 0.1-1 M, and the molar ratio of bromine ions to iodide ions is 0.1-10. The zinc-double-halogen battery has high ionic conductivity, efficient active substance utilization rate, excellent cycle performance and higher rate capability, and the electrochemical performance of the zinc-double-halogen battery can be remarkably improved.

The invention relates to an electrolyte for synergistically stabilizing positive electrode iodine multi-electron reaction through four-combination zinc salt and a high-surface-capacity zinc-iodine soft package battery. The electrolyte comprises the four-combination zinc salt and water, in the electrolyte, the total concentration of zinc ions in the four combinations of zinc salts is 2 + / -0.2 mol / L; the four-combination zinc salt is a four-combination zinc salt; the SO4 < 2-> in the electrolyte buffers the pH value of a system, so that side reaction of a negative electrode is reduced; cH3COO <-> can be cross-linked with I3 <->, so that shuttling of polyiodide is inhibited, and reversibility of a two-electron reaction is enhanced; bromide ions Br <-> in the electrolyte are chemically combined with I < + > through isohalogen to excite four-electron reaction; the trifluoromethanesulfonate OTf <-> with strong electronegativity surrounds the positive electricity I < + > by virtue of an ion atmosphere effect, so that active water molecule attack hydrolysis failure is avoided, a synergistic stable positive electrode iodine multi-electron reaction is realized, and the high-surface-capacity zinc-iodine soft package battery is beneficial to promoting the development of the zinc-iodine battery to practical application.

The invention discloses a method for removing bromine ions in a salt water body. The method comprises the steps of pretreatment before electrolytic oxidation, primary precise directional electrolysis, primary split-pole separated air real-time air stripping, secondary precise directional electrolysis, secondary split-pole separated air real-time air stripping, deep removal of bromine ions Br <-> by a reverse osmosis membrane, separation of bromine carrier airflow containing Br2 and the like. According to the method, the problems of environmental friendliness, economical efficiency, relatively good adaptability, directivity of a bromine ion Br <-> removal standard and how to deeply remove the bromine ion Br <-> in the prior art can be solved, and the Br <-> in the salt water body can be reduced to 10 ppm or below; the unit operation in the process path is basically conventional operation or universal operation, and has a good engineering feasibility foundation and an economic feasibility foundation.

The invention discloses a PbS quantum dot film which comprises a PbS-PbX2 quantum dot layer and a passivation layer covering the surface layer of the quantum dot layer. Wherein X is I and / or Br, and the passivation layer is made of iodine 3-aminopropionate and / or bromine 3-aminopropionate. Iodine 3-aminopropionate and / or bromine 3-aminopropionate are / is used as a passivator of the PbS-PbX2 quantum dot layer, amino (-NH2) and carboxylate radical (-COO-) in the iodine 3-aminopropionate and / or bromine 3-aminopropionate molecules can be used as bidentate ligands to be anchored on the surfaces of lead sulfide (PbS) quantum dots, the sulfur vacancy defect is filled, and the density of surface dangling bonds is reduced; and iodine or bromide ions are combined with Pb < 2 + > on the surfaces of the PbS quantum dots to form stable Pb-X bonds, so that non-radiative recombination can be inhibited, and the photoelectric conversion performance of the device is further optimized.

The invention relates to the technical field of electrochemistry, in particular to a supramolecular ionic liquid gel electrolyte of a solid-state zinc-iodine battery for a high-voltage platform, which is characterized in that free water in hydrogel is replaced by supramolecular interaction between ionic liquid and polyvinyl alcohol molecules to construct a water-poor ionic liquid polymer network; zinc bromide is introduced to serve as an ion carrier in a polymer network through the HofMichael effect, and preparation of the high-voltage solid-state zinc-iodine battery is finally achieved through the chemical coupling effect of bromide ions and iodide ions; the solid electrolyte is prepared from an ionic liquid and a hydrogel solution, imidazole cations of the ionic liquid have a strong electron withdrawing effect, and anions of the ionic liquid are combined with zinc ions and bromide ions to form polyanions. And the ionic liquid is used for replacing water in the hydrogel, so that the ionic liquid gel electrolyte with good chemical stability, mechanical property and electrochemical property is prepared.

The invention relates to a silver nanowire preparation technology, and aims to provide a method for preparing a high-length-diameter-ratio silver nanowire in one step through a solvothermal synthesis reaction. Comprising the following steps: mixing and stirring silver ions and a PVP (Polyvinyl Pyrrolidone) solution, continuously adding bromide ions and chloride ions serving as a nucleating agent, and mixing and stirring to obtain a reaction solution; transferring the reaction solution into a hydrothermal reaction kettle, and reacting under a heating condition to obtain a silver nanowire mother solution; and sediments in the silver nanowire mother liquor are separated and cleaned, and the silver nanowires with the length-diameter ratio being 2148-3190 are obtained. By means of a cooperative regulation mechanism of bromide ions, chloride ions and polyvinylpyrrolidone, the problem that in existing research work, the length and the diameter of the silver nanowire are difficult to consider at the same time is solved, and it is ensured that the length of the silver nanowire is maintained while the diameter of the silver nanowire is reduced; the technological process is simplified, and the problems of nitrogen atmosphere reaction, secondary heating and the like in the prior art are solved; and by optimizing all reaction parameters, stable and controllable preparation of the silver nanowire with the high length-diameter ratio is finally achieved.

The invention provides a gel-state electrolyte and a preparation method thereof, and a zinc-bromine microbattery and a preparation method thereof, and belongs to the technical field of aqueous static zinc-bromine batteries. The xerogel is soaked in an electrolyte to obtain a gel-state electrolyte, ions in the electrolyte comprise bromide ions and zinc ions with electrochemical activity, and the concentration of the zinc ions is 5-12.5 mol / L. Reassembling the zinc-bromine microbattery through the gel-state electrolyte; a complexing agent and an anti-freezing agent do not need to be additionally added into the gel-state electrolyte, the preparation method is simple, the zinc-bromine microbattery can be used as energy supply equipment of flexible or microelectronic devices, the use scene and the application prospect of the zinc-bromine battery are remarkably widened, and stable energy supply can also be achieved under the variable-temperature condition. The zinc-bromine microbattery can be cycled for more than 5000 times at normal temperature, the specific capacity is 184 mu Ah.cm <-2 >, the zinc-bromine microbattery can also be cycled for more than 500 times at the temperature of-60 DEG C, and the capacity retention ratio is 98%.

The invention relates to the technical field of preparation of propylene carbonate, and discloses a bromide ion intercalated magnesium-aluminum layered hydroxide as well as a preparation method and application thereof. The method comprises the following steps: (1) providing an aqueous solution containing an aluminum source and a magnesium source, mixing the aqueous solution containing the aluminum source and the magnesium source with an alkali source, aging the obtained mixed solution, and then separating out a solid phase; and (2) mixing the solid phase obtained in the step (1) with an aqueous solution containing a bromine source, aging the obtained turbid liquid, and then carrying out solid-liquid separation. The bromide ion intercalated magnesium-aluminum layered hydroxide prepared by the method provided by the invention can effectively catalyze ring opening of epoxypropane, can obtain obviously higher propylene carbonate yield under mild conditions, cannot be inactivated after being used as a catalyst for many times, and has higher stability.

The invention relates to a multi-metal hydroxide and iodine composite material as well as a preparation method and application thereof. According to the invention, efficient chemical adsorption of negatively charged iodine species (such as I <-> and I3) in the electrolyte is realized by utilizing the unique layered structure and the characteristic that the surface of the multi-metal hydroxide material is positively charged, so that the iodine-loaded positive electrode material is successfully prepared. The physical confinement and strong electrostatic interaction of the material can effectively anchor an iodine active substance, inhibit the dissolution and shuttle effect of polyiodide ions, and significantly reduce the loss of the active substance in the cycle process. Meanwhile, bromide ions or chloride ions are introduced into the electrolyte to anchor I < + >, so that a four-electron transfer reaction mechanism of iodine is realized, and the specific capacity of the battery is greatly improved. Experimental results show that the capacity retention rate of the zinc-iodine battery adopting the positive electrode material reaches 88% or above after circulation for 30000 times under the current density of 10 Ag <-1 >, and the zinc-iodine battery shows excellent high-capacity performance and long circulation stability. The invention provides a new technical scheme for developing a high-performance aqueous zinc-iodine battery, and has a wide application prospect in the field of energy storage.

The invention provides a manganese dioxide / bismuth oxybromide heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic reduction of carbon dioxide by a nano material. The preparation method of the manganese dioxide / bismuth oxybromide heterojunction photocatalyst comprises the following steps: dispersing a bismuth source and manganese dioxide into water to obtain a suspension, adding a bromine source into the suspension, and reacting bismuth ions in the bismuth source with bromine ions in the bromine source by a chemical precipitation method to obtain the manganese dioxide / bismuth oxybromide heterojunction photocatalyst. A bismuth oxybromide nanosheet is loaded on the surface of manganese dioxide, and the manganese dioxide / bismuth oxybromide heterojunction photocatalyst is obtained. In the preparation process, a bromine source and a bismuth source are subjected to in-situ synthesis on the surface of manganese dioxide to obtain bismuth oxybromide, and the prepared manganese dioxide / bismuth oxybromide heterojunction photocatalyst has excellent photocatalytic performance.

The invention belongs to the technical field of measurement, and relates to an intelligent correction method for an ultraviolet spectrum signal of a seawater nitrate sensor. The method comprises the following steps: 1, calculating absorbance data of each sample at different temperatures; 2, preprocessing the absorbance data by adopting a self-adaptive wavelet denoising algorithm; 3, performing linear fitting on the preprocessed data within the wavelength range of 240-260nm to obtain a linear equation; the absorbance data obtained after baseline correction is determined as the absorbance of the bromide ions; 4, calculating the molar extinction coefficient of the bromide ions, and solving a linear relation between the natural logarithm of the molar extinction coefficient of the bromide ions and the temperature; 5, temperature correction is conducted on the molar extinction coefficient of the bromide ions; 6, salinity correction is conducted through the salinity credible factor, and finally the bromide ion absorbance subjected to temperature salinity correction is obtained. According to the method, the problems of bromine ion spectrum overlapping interference, random noise, baseline interference, temperature-salt interference and the like can be effectively solved.

The invention provides a PTA wastewater treatment method, which comprises: carrying out biodegradation treatment and membrane separation treatment on to-be-treated PTA wastewater, carrying out adsorption treatment through an adsorption resin, and carrying out ultrafiltration and reverse osmosis treatment, wherein the adsorption resin is formed by compounding zeolite and a polymer, and is obtained by the following method: uniformly mixing zeolite, styrene, divinylbenzene, an initiator, a pore-foaming agent and 3-methyl-5-vinylpyridine to obtain an oil phase; uniformly mixing water and a dispersing agent to obtain a water phase; and uniformly mixing the oil phase and the water phase, stirring, and carrying out polymerization reaction to obtain the adsorption resin. According to the PTA wastewater treatment method disclosed by the invention, a physical process and a biochemical process are combined, so that pollutants such as bromide ions can be effectively removed, and the wastewater recycling requirement is met.

The invention relates to the technical field of organic synthesis, in particular to a method for synthesizing cyclopentane compounds through [3 + 2] cycloaddition reaction of aryl cyclopropane and olefin under the synergistic catalysis of bromide ions / visible light. The method comprises the following steps: in a nitrogen atmosphere, sequentially adding aryl cyclopropane, a benzyl malononitrile derivative, pyridine tribromide and a photocatalyst into a reaction solvent to obtain a mixture, stirring the mixture at the temperature of 40 DEG C under the irradiation of a 12W blue light LED lamp until the reaction is complete, and performing concentration and column chromatography purification to obtain the cyclopentane compound. The method has the advantages of mild reaction conditions, simple operation, simple and easily available raw materials and low cost.

The application discloses a vanadium-bromine flow battery electrolyte, a preparation method thereof and a flow battery. The electrolyte comprises a positive electrolyte and a negative electrolyte. The positive electrolyte contains water, bromine ions and an additive. The additive is a pyridine derivative and / or an imidazole derivative. The negative electrolyte contains an acid, vanadium ions and water. The preparation method comprises the following steps: mixing a bromine source with water, and then adding the pyridine derivative and / or the imidazole derivative to obtain the positive electrolyte; dissolving a vanadium source with an acid, and then filtering to obtain a filtrate; adding water to the filtrate, and then adjusting the concentration of vanadium ions to a target final concentration to obtain the negative electrolyte. The flow battery comprises the above-mentioned vanadium-bromine flow battery electrolyte, a positive electrode, an ion-conducting membrane and a negative electrode. The application solves the problems of low energy density, high price and cost, zinc dendrite and positive bromine volatilization of the current flow battery by introducing the coupling of a vanadium-based energy storage medium and a bromine oxygen reduction-oxidation couple.

The invention discloses a method for synthesizing a trace ruthenium modified cobaltosic oxide nanocage catalyst by an ion exchange method, which comprises the following steps: dropwise adding a methanol solution of dimethylimidazole into a methanol solution containing cobalt nitrate hexahydrate, and reacting to obtain a precursor ZIF67; dropwise adding the ethanol solution of ruthenium chloride into the ethanol solution containing the ZIF67 to obtain ruthenium modified ZIF67; and calcining the ruthenium modified ZIF67 to prepare the trace ruthenium modified cobaltosic oxide nanocage catalyst. The invention also discloses an application of the catalyst in preparation of 2-bromoethanol by electro-catalytic oxidation of ethylene, and the catalyst shows high intrinsic activity and high catalytic activity. A trace amount of metal ruthenium is introduced into the cobalt-based catalyst to form abundant Ru-O-Co asymmetric active sites, and meanwhile, the electronic structure on the surface of the catalyst and the activation energy barrier of bromide ions in the electro-catalytic reaction process are changed through dissimilar metal doping, so that the catalytic performance is improved.

The invention discloses a purification method of bromine, which comprises the following steps: continuously feeding crude bromine from the middle of a tower reactor, continuously feeding an aqueous solution containing bromine ions from the top of the tower reactor, and controlling the temperature of the tower reactor, so that chlorine in the bromine reacts with the aqueous solution containing the bromine ions in the tower, and purified bromine is extracted from the tower top. The tower reactor is adopted to purify bromine, continuous feeding and discharging are achieved, operation is easy, convenient and feasible, the purification efficiency is high, the chlorine content in bromine can be reduced to 0.01% or below, and the quality of bromine is improved to a large extent.

The invention provides a composition containing metal type theta-iron carbide and epsilon / epsilon '-iron carbide as well as a preparation method and application of the composition. The method comprises the following steps: preparing a metal type theta-iron carbide compound; preparing a metal type epsilon / epsilon '-iron carbide compound; and mixing the metal type theta-iron carbide compound and the metal type epsilon / epsilon '-iron carbide compound to obtain the metal type iron carbide composition containing theta-iron carbide and epsilon / epsilon'-iron carbide, or mixing the metal type theta-iron carbide and the metal type epsilon / epsilon '-iron carbide to obtain a metal type iron carbide mixture; and carrying out dipping treatment on the metal type iron carbide mixture to enable the metal type iron carbide mixture to contain bromide ions and / or iodide ions. According to the composition disclosed by the invention, halide ions such as bromine or iodine are introduced into the components of the composition to serve as a catalyst for a synthesis gas conversion reaction, so that the reaction has a relatively high CO conversion rate and the like, and comprehensive optimization of a reaction result is realized.

An efficient energy-saving evaporation system for extracting bromine from brine relates to the technical field of bromine production and comprises a horizontally arranged supporting base, a vertically arranged separation tank is fixedly arranged at the top of the supporting base, a mixing assembly and a gas inlet assembly which are communicated with each other are vertically arranged in the separation tank, and the gas inlet assembly is communicated with an external chlorine source. A heating assembly is arranged at the top of the supporting base, the mixing assembly is communicated with the heating assembly, and a discharge pipe and a waste discharge valve which are communicated with an inner cavity of the separation tank are fixedly arranged at the top and the lower outer wall of the separation tank; the heating assembly comprises a vertically-arranged rectangular supporting frame, a vertically-arranged supporting ring is fixedly arranged on the inner wall of the rectangular supporting frame, and a coil disc type winding is coaxially arranged in the supporting ring. The problems that existing evaporation equipment for extracting bromine from brine is low in bromine extraction rate and serious in energy waste are solved; the heat conduction efficiency of the liquid heating assembly is low, so that the heating speed is low; the oxidation rate of bromide ions in the primary acid is low due to short contact time and poor contact effect of the primary acid and chlorine.