80 results about "Zinc bromide" patented technology

The invention discloses a high-strength cold-resistant fiber and a preparation method thereof, and relates to the field of fibers. When the high-strength cold-resistant fiber is prepared, diphenylphosphine sequentially reacts with triallylmethoxysilane and nickel bromide, and a silicon-phosphorus-nickel complex is prepared; the preparation method comprises the following steps: reacting an alkene mixed solution, azodiisobutyronitrile, a hydrochloric acid solution and a silicon mixed solution, diluting with 4-methyl cyclohexanone, and reacting with zinc bromide to prepare a pre-modified polyacrylate emulsion; the preparation method comprises the following steps: carrying out a batch reaction on graphene oxide and 1-aminopyrrole to prepare modified graphene oxide; the modified graphene oxide, 2, 5-dihydroxy terephthalaldehyde and the pre-modified polyacrylate emulsion react and then electrostatic spinning is conducted, and the high-strength cold-resistant fiber is prepared. The high-strength cold-resistant fiber prepared by the invention has antibacterial, anti-aging, flame-retardant and antistatic capabilities.

The invention provides a double-phase diaphragm-free zinc-bromine battery electrolyte, a preparation method and application, belongs to the technical field of energy storage batteries, and aims to solve the problems that an organic solvent of an existing double-phase diaphragm-free zinc-bromine battery electrolyte has safety risks, the solubility of active substances is not high, and the service life of the battery is prolonged. And when a specific ionic liquid is used as an organic phase, the bromine fixation function is single. Imidazole bromine salt and zinc bromide are jointly dissolved in water, and an ionic liquid phase and a water phase are formed by adjusting the adding amount of the zinc bromide. The solubility of the bromine species in the ionic liquid phase is far greater than that in the water phase, and the imidazole bromine salt can be complexed with the bromine species to form a polybromine complex, so that the ionic liquid phase can be used as a positive electrode electrolyte of a two-phase zinc-bromine battery. The raw materials of the prepared dual-phase electrolyte all participate in the electrode reaction of the zinc-bromine battery, bromine species are dissolved and fixed in an ionic liquid phase under the condition that other organic solvents or ionic liquid is not introduced, diffusion of the bromine species to a water phase is reduced, and the self-discharge phenomenon of the zinc-bromine battery is reduced. And the preparation method of the electrolyte is simple, greatly simplifies the manufacturing process of the battery, and is easy to popularize and apply.

The invention provides an upgrading and purifying method for waste tire pyrolysis carbon black, and belongs to the technical field of upgrading, purifying and high-value utilization of waste tires and waste rubber pyrolysis carbon black. The upgrading and purifying method comprises the following steps: carrying out wet magnetic separation on waste tire pyrolysis carbon black to obtain pyrolysis carbon black subjected to magnetic separation; mixing the cracked carbon black subjected to magnetic separation with hydrobromic acid for acid leaching to obtain first acid leaching filtrate and a first carbon black product; adding zinc particles into the first acid leaching filtrate to obtain second filtrate; evaporating and crystallizing the zinc bromide solution to obtain zinc bromide; zinc bromide is prepared into heavy liquid, the first carbon black product is subjected to reselection, and a pure carbon black product and silicon dioxide tailings are obtained; introducing hydrogen sulfide gas into the ferric ion solution for purification and absorption to obtain sulfur and a third filtrate; and the third filtrate is subjected to electrolytic regeneration, and a regenerated ferric ion solution and hydrogen are obtained after electrolytic regeneration is finished. According to the method, the acid leaching byproduct zinc bromide is used as a reselection medium, and resource recycling is achieved while efficient separation and impurity removal are achieved.

The invention discloses an electrolyte containing a composite complexing agent and a preparation method thereof, and the method comprises the following steps: at room temperature, dissolving zinc bromide with a set concentration in a solvent to form a zinc bromide solution, continuously adding choline chloride with a set concentration, and stirring until the choline chloride is completely dissolved in the zinc bromide solution, a zinc bromide solution containing choline chloride is obtained; monitoring the pH value of the zinc bromide solution containing choline chloride, and adding macromolecular acid into the zinc bromide solution containing choline chloride until the pH value of the zinc bromide solution containing choline chloride is stabilized at a preset value; and adding betaine with a set concentration into the zinc bromide solution containing choline chloride with the pH value stabilized at a preset value, and continuously stirring to obtain the electrolyte containing the composite complexing agent. The problem that an existing complexing agent MEP is prone to being attached to the pipe wall and a flow channel, and consequently blockage is caused can be solved.

The invention belongs to the technical field of electrochemical energy storage, and provides a negative electrode electrolyte, a preparation method thereof and a zinc-bromine flow battery. The negative electrode electrolyte comprises the following components: zinc bromide, supporting electrolyte, a negative electrode additive and water, and the negative electrode additive comprises malic acid; and the concentrations of the zinc bromide, the supporting electrolyte and the malic acid in the negative electrode electrolyte are 2.0 to 2.5 mol / L, 2.0 to 3.0 mol / L and 0.02 to 0.04 mol / L respectively. Zinc dendrites and hydrogen evolution reaction are effectively inhibited, and cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is achieved. Therefore, the malic acid is introduced into the negative electrode electrolyte, so that the zinc dendrite and hydrogen evolution reaction in the zinc-bromine flow battery can be effectively inhibited, and the cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is realized.

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 discloses a runner structure for improving the mass transfer performance of a zinc-bromine flow battery positive electrode and a design method of the runner structure, and belongs to the field of flow batteries. Aiming at the problem of non-uniform two-phase flow mass transfer of positive electrode electrolyte (a zinc bromide solution and an organic bromine complex) of a zinc-bromine flow battery, a scheme of arranging rib plate structures which are arranged in a staggered manner on the inner wall of a snake-shaped flow channel of the bipolar plate is provided. The rib plate structure increases flow velocity change, enhances turbulence disturbance and promotes two-phase uniform mixing; meanwhile, the pressure drop of the runner is increased, and the infiltration amount of electrolyte to the electrode is improved. Simulation results show that under the conditions that the electrolyte inlet flow velocity is 0.1 m / s and the electrode permeability is 1 * 10 <-11 > m < 2 >, the average volume fractions of bromine complexes in the electrode with the size of 2 cm * 2 cm are increased by 140% (the included angle between the bromine complexes and the flow direction is 45 degrees) and 123% (the included angle between the bromine complexes and the flow direction is 135 degrees) respectively compared with a traditional S-shaped flow channel, and the relative standard deviation of reactant phase holdup is reduced by 4.3% and 7.9% respectively. The mass transfer condition of the positive electrode electrolyte of the zinc-bromine flow battery is remarkably improved, and the positive electrode electrolyte can be applied to a large-scale energy storage zinc-bromine flow battery system.

The invention discloses a novel sodium ion battery halide solid electrolyte, and belongs to the technical field of electrolyte materials, the molecular formula of the halide solid electrolyte is NaXTaCl5FX, X is equal to 1-3, the halide solid electrolyte is weighed according to the molar ratio of tantalum chloride to sodium fluoride under the protection of argon, and electrolyte matrix mixed powder is obtained through high-energy ball milling; carrying out ball milling on nano silicon dioxide and zinc bromide according to a molar ratio to prepare a sintering aid; the electrolyte matrix mixed powder is pressed into a biscuit piece, and the biscuit piece is subjected to heat treatment in argon to obtain a halide electrolyte matrix; and finally, grinding the halide electrolyte matrix, doping a sintering aid, tabletting, sintering and ball-milling to obtain the novel sodium-ion battery halide solid electrolyte. And densification and structural stability of the material are synergistically realized, and finally the solid electrolyte with high ionic conductivity and wide electrochemical window is obtained.

The invention discloses a zinc-iodine battery based on a zinc bromide electrolyte, and belongs to the technical field of chemical energy batteries. The zinc-iodine battery comprises a positive electrode, a negative electrode and an electrolyte, the positive electrode is a positive electrode containing a dual catalytic system, and the electrolyte is an electrolyte containing zinc bromide; the positive electrode containing the dual catalytic system comprises a dual catalytic system material, conductive carbon and a binder; the dual catalytic system material is obtained by mixing an iodine elementary substance and a non-polar compound which contains halogen and a carbon group and has a symmetrical structure. The preparation method comprises the following steps: adding tetrabromo-p-benzoquinone and elemental iodine into an organic solvent for dissolving, and removing the organic solvent to obtain the dual catalytic system material, wherein the non-polar compound containing halogen and a carbon group and having a symmetrical structure is tetrabromo-p-benzoquinone. The two-step reaction of the zinc-iodine battery is doubly catalyzed by the TBBQ and the Br <->, the reaction kinetics is improved, and meanwhile, the TBBQ and the Br <-> can be subjected to oxidation-reduction reaction at the same potential to provide extra capacity, so that the construction of the high-rate and high-capacity zinc-iodine battery is realized.

The invention relates to the technical field of functional gel materials, and discloses a preparation method of a high-strength, environment-friendly and conductive composite gel material, and the composite gel material is prepared from the following components by mass: 10-40% of water; 0.5-8% of zinc bromide; 30-60% of glycerin; 5-20% of ethanol; 0.5-8% of tannic acid; the preparation method comprises the following steps: forming a dynamic hydrogen bond network through the synergistic crosslinking effect of the gelatin and the tannic acid, regulating and controlling the gelation rate in combination with a glycerol-water-ethanol mixed solvent, introducing zinc bromide to improve the conductivity, mixing the components in proportion, heating and stirring, cooling, and quickly curing and forming within 1-2 minutes. The tensile strength of the obtained composite gel material is improved by more than 60 times, the electric conductivity reaches 2-10 S / m, high mechanical strength, rapid prototyping, recoverable remodeling and excellent electric conductivity are achieved through natural polymer crosslinking, solvent volatilization regulation and ionic conductivity enhancement technologies, and the composite gel material has the advantages of being high in mechanical strength, capable of being recycled and remodeled and high in conductivity. The method is suitable for the fields of flexible electronics, wearable equipment and biosensing.

The present invention discloses a method and system for producing hexafluorobutadiene, which includes the following steps: In step (1), an organic solution of bromotrifluoroethylene and zinc powder are respectively introduced into a first reactor containing an initiator, zinc powder, and an organic solvent, followed by a second reactor, and reacted to obtain a trifluorovinylzinc bromide solution. The reaction solution is then introduced into a precipitator to separate excess zinc powder, resulting in a zinc-free trifluorovinylzinc bromide solution. The excess zinc powder is then filtered and reused. In step (2), the trifluorovinylzinc bromide solution obtained above and a pre-prepared composite catalyst solution are introduced into a third reactor and subjected to a coupling reaction to obtain crude hexafluorobutadiene. In step (3), the crude hexafluorobutadiene obtained above is purified to obtain a product with a purity of ≥ 99.9%.

The invention relates to the technical field of electrochemical energy storage, in particular to an electrolyte for a zinc-bromine flow battery with a membrane-free single-liquid single-tank structure. The electrolyte is a multiphase mixed solution, wherein a light phase component mainly comprises an aqueous solution of zinc bromide, zinc chloride and 1-butyl-2-methyl pyridine bromide; and the heavy phase component of the electrolyte is mainly a bromine complex of 1-butyl-2-methyl brominated pyridine. The invention has the following remarkable beneficial effects: firstly, the zinc-bromine flow battery can normally operate under a membrane-free single electrolyte storage tank structure, so that the battery framework is simplified, and the initial installation cost is reduced; and secondly, the problems of bromine cross diffusion, zinc dendrite and the like of the membrane-free structure zinc-bromine flow battery are effectively solved by a plurality of trace special additives, the battery is ensured to run well under the membrane-free structure, and the battery performance is ensured while the cost is reduced.

The present invention relates to the technical field of organic chemistry, and discloses a preparation method of 9-phenanthrene formic acid, wherein the preparation method comprises the following steps: using phenanthrene as a main raw material, iron bromide or zinc bromide as a catalyst, reacting with hydrobromic acid and hydrogen peroxide at 20 to 50 ° C to generate 9-bromophenanthrene, 9-bromophenanthrene reacts with cyanide under a catalyst to generate 9-nitrile phenanthrene, and then hydrolyzing under alkaline conditions to obtain 9-phenanthrene formic acid. The present invention uses cheap and readily available raw materials such as phenanthrene, hydrobromic acid, hydrogen peroxide and sodium cyanide to prepare 9-phenanthrene formic acid, with low production cost, high conversion rate, good product quality, mild reaction conditions, low equipment requirements, and can be used for large-scale industrial preparation of 9-phenanthrene formic acid.

The invention belongs to the technical field of zinc-bromine flow batteries, and particularly relates to an additive, a zinc-bromine flow battery electrolyte and a preparation method and application of the zinc-bromine flow battery electrolyte, the additive is 1-p-cyanophenyl-2-trifluoromethylpyridine bromide, and the zinc-bromine flow battery electrolyte comprises the additive, zinc bromide and potassium chloride. The additive disclosed by the invention can greatly prolong the cycle life and improve the stability of the battery. The zinc-bromine flow battery electrolyte provided by the invention has good wettability to an electrode, not only can reduce diffusion of bromine and improve coulombic efficiency of the battery, but also can form a stable electrolyte interface layer on a zinc negative electrode to induce uniform deposition or dissolution of zinc ions in the zinc-bromine flow battery, so that the zinc-bromine flow battery is more stable in performance. The growth of zinc negative electrode dendrites in the zinc-bromine flow battery is effectively inhibited, and the cycle life and the stability of the zinc-bromine flow battery are greatly improved.

This invention belongs to the field of organic synthesis and discloses a method for preparing 2-bromo-5-fluorotrifluorotoluene, comprising: controlling the temperature at 5-20℃, mixing m-fluorotrifluorotoluene with sulfuric acid, adding a composite catalyst, and then adding NBS in batches. After the NBS addition is completed, the reaction is maintained at this temperature until the m-fluorotrifluorotoluene content is ≤1%, at which point the reaction is stopped; the reaction solution is allowed to stand and separate into layers to obtain crude 2-bromo-5-fluorotrifluorotoluene; the crude 2-bromo-5-fluorotrifluorotoluene is then subjected to alkali washing and water washing, followed by atmospheric distillation, collecting the fraction at 158-165℃ to obtain the 2-bromo-5-fluorotrifluorotoluene product; the composite catalyst is a mixture of elemental iodine, zinc bromide, and tetrabutylammonium bromide. This method involves only one reaction step, is simple to operate, has accurate reaction positioning, high raw material conversion rate, high reaction yield, easy product purification, and simple post-processing. The reaction yield can reach over 93.0%, and the purity is over 98.0%.

The invention provides a preparation method of buracametacin hydrochloride and an intermediate compound shown as a formula II thereof. The preparation method of the compound as shown in the formula II comprises the following steps: in the presence of a reducing agent, a compound as shown in the formula I is subjected to a reduction reaction to generate the compound as shown in the formula II. The reducing agent is selected from sodium borohydride and / or lithium borohydride, lewis acid also exists in the reaction system, and the lewis acid is also selected from zinc bromide, zinc chloride, boron trifluoride, aluminum chloride, ferric chloride or a combination thereof. The preparation method disclosed by the invention is low in reducing agent price, mild in reaction, relatively high in product yield and purity, and suitable for industrial large-scale production. # imgabs0 #

The preparation method comprises the following steps: after a micro electrode is prepared through 3D printing, iodine is loaded on the surface of the micro electrode to form an iodine positive electrode; preparing a zinc negative electrode matched with the iodine positive electrode in shape through laser engraving; uniformly mixing water, hyaluronic acid, hydrophilic silicon dioxide, zinc perchlorate and zinc bromide to form a gel electrolyte; and sequentially laminating the iodine positive electrode, the gel electrolyte and the zinc negative electrode on the substrate, and packaging to obtain the wide-temperature-range micro zinc-iodine battery. According to the gel electrolyte disclosed by the invention, hyaluronic acid and hydrophilic silicon dioxide lock water through hydrogen bonds formed between hyaluronic acid and hydrophilic silicon dioxide and water molecules, evaporation of water at a high temperature is inhibited, perchlorate inhibits solidification of water at a low temperature by destroying hydrogen bond structures between water molecules in a gel network, and a wide temperature range of a miniature battery is realized; meanwhile, bromide ions in the electrolyte are transmitted to a positive electrode through an interface to excite a four-electron reaction of iodine, so that the energy density of the micro zinc-iodine battery is improved.

The invention provides a high-temperature-resistant high-density solid-free water-based completion fluid as well as a preparation method and application thereof. The water-based completion fluid is prepared from the following components in parts by weight: 29 to 42 parts of water, 22 to 38 parts of phosphate, 12 to 17 parts of potassium formate, 8 to 12 parts of zinc bromide, 3 to 7 parts of calcium chloride, 0.5 to 2 parts of a flow pattern regulator, 2 to 3 parts of a corrosion inhibitor and 1 to 2 parts of a filtrate reducer, the flow pattern conditioning agent comprises a Dristemp and / or a Driscal D, and the flow pattern conditioning agent comprises a Dristemp and a Driscal D; the filtrate reducer is polyanionic cellulose; and the density of the water-based completion fluid is 1.6-2.2 g / cm < 3 >. The high-temperature-resistant high-density solid-free water-based completion fluid disclosed by the invention realizes good high-temperature resistance, and still has good viscosity, fluidity, temperature resistance and corrosion resistance after being subjected to hot rolling for 16 hours at the high temperature of 220 DEG C.

An electrolyte of a static zinc-based battery, includes zinc bromide in a molar concentration ranging from 1.5 M to 3.0 M, a mixture of two or more quaternary ammonium salts as a bromine complexing agent in a range of 30% to 55% of the molar concentration of the zinc bromide, a glycol based anti-freezing agent in molar concentration ranging from 0.1 M to 2.0 M; and one or more additional supporting ionic conducting agents selected from a group comprising of zinc chloride, potassium chloride, magnesium chloride, lithium chloride, calcium chloride, or a combination thereof. Each of the one or more additional supporting ionic conducting agents or their combination is in a molar concentration ranging from 0.5 M to 2 M.

An electrolyte of a static zinc-based battery, includes a) zinc bromide in molar concentration from 1.5M to 3.0M, b) tetraethylammonium bromide as a bromine complexing agent in half of the molar concentration of the zinc bromide, c) a glycol based anti-freezing agent in molar concentration from 1.0M to 2.0M, d) zinc chloride as supporting ionic conducting agent in molar concentration from 1.0M to 4.0M, and e) an additional supporting ionic conducting agent in molar concentration from about 2.0M to 4.0M. The electrolyte minimizes the self-discharge of the static zinc-based battery and improves the energy density of the static zinc-based battery.

The invention discloses a zinc-lead halide quasi-two-dimensional green light perovskite composition as well as a preparation method and application thereof. The zinc-lead halide quasi-two-dimensional green light perovskite composition is prepared from the following raw materials: [bis (4-methoxyphenyl) phosphorus oxy] tert-butyl carbamate and zinc bromide. According to the prepared device, the external quantum efficiency (EQE) is remarkably improved from 7.1% to 21.5%, the leap-forward progress means that the photoelectric conversion efficiency of the device is greatly improved, and a more efficient choice is provided for application in related fields. And meanwhile, the T50 service life of the device is prolonged from the transient 0.86 hours to the amazing 3.72 hours, and is prolonged by about 4.3 times, so that the durability and the reliability of the product are greatly improved.

The application provides a kind of alkaline zinc iron liquid flow battery electrolyte and its application, belong to liquid flow battery technical field.The negative electrode electrolyte of the application is prepared into suspension by dissolving zinc bromide in strong alkali solution;The concentration difference exists in the alkali concentration of positive and negative electrode electrolyte, and the alkali concentration of positive electrode electrolyte is lower than that in negative electrode electrolyte.The use of positive and negative electrode electrolyte of the application can effectively alleviate the migration problem of alkaline zinc iron liquid flow battery electrolyte, improve the energy density of negative electrode electrolyte, widen the applicable temperature range of battery, and improve the reliability of battery.

The application belongs to the technical field of electrochemical energy storage, and provides a negative electrolyte, a preparation method thereof and a zinc-bromine flow battery. The components of the negative electrolyte include zinc bromide, a supporting electrolyte, a negative electrode additive and water, the negative electrode additive includes malic acid, the concentrations of the zinc bromide, the supporting electrolyte and the malic acid in the negative electrolyte are 2.0-2.5 mol / L, 2.0-3.0 mol / L and 0.02-0.04 mol / L respectively. The zinc dendrite and hydrogen evolution reaction are effectively inhibited, and the synergistic improvement of coulombic efficiency, voltage efficiency and energy efficiency is realized. Therefore, by introducing malic acid into the negative electrolyte, the zinc dendrite and hydrogen evolution reaction in the zinc-bromine flow battery can be effectively inhibited, and the synergistic improvement of coulombic efficiency, voltage efficiency and energy efficiency is realized.

The application discloses a kind of non-fiber flame-retardant polyamide compositions and preparation method and application thereof, and it is related to the technical field of engineering plastics.A kind of non-fiber flame-retardant polyamide composition includes the following weight parts of components: polyamide resin 55-81 parts;Bromine flame retardant 19-42 parts;Zinc borate 4-12 parts;Antimony white 1-12 parts;Zinc bromide 0.1-0.6 parts;The viscosity of the polyamide resin is 2.4-2.7.The non-fiber flame-retardant polyamide composition of the application can reach 5VA flame-retardant grade, while improving the flame-retardant property without affecting its appearance gloss and mirror effect.

The invention provides a preparation method of hexafluorobutadiene, which comprises the following steps: 1) carrying out electrophilic addition reaction on chlorotrifluoroethylene and liquid bromine at normal temperature and normal pressure to generate 1, 2-dibromo-1-chloro-1, 2, 2-trifluoroethane; 2) mixing zinc powder, 1, 2-dibromo-1-chloro-1, 2, 2-trifluoroethane and an aprotic polar solvent, and carrying out a reaction so as to obtain a zinc reagent containing 1-chloro-2-bromo-1, 2, 2-trifluoroethyl zinc bromide and 1, 2-dibromo-1, 2, 2-trifluoroethyl zinc chloride; 3) adding a catalyst and a zinc reagent, and carrying out a self-coupling reaction to generate an intermediate product containing 1, 4-dibromo-2, 3-dichloro-1, 1, 2, 3, 4, 4-hexafluorobutane and 1, 2, 3, 4-tetrabromo-1, 1, 2, 3, 4, 4-hexafluorobutane; 4) dehalogenating the intermediate product to generate hexafluorobutadiene; the method has the effects of simple reaction process, relatively low risk, relatively mild reaction conditions and relatively high yield.

The application relates to a high-concentration aqueous zinc-ion battery electrolyte, aiming to improve the electrochemical performance of the battery, in particular the low-temperature ion transport capacity, the working temperature range and the cycle life. The electrolyte comprises zinc bromide, lithium bromide and deionized water, wherein the concentration of the zinc bromide is 5-12 mol / L, the concentration of the lithium bromide is 10-24 mol / L, and the molar ratio of the two is 1:(0.2-5). By adding lithium bromide as an additive, the long-range ordered local cluster network of zinc bromide is broken, a high-entropy electrolyte is formed, and the ion conductivity and the electrochemical performance are significantly improved. Experimental results show that the electrolyte exhibits excellent ion conductivity and coulomb efficiency at different temperatures, and is suitable for a wide working temperature range.

To provide a method for the production of an ultra-pure zinc bromide and zinc chloride fluid blend in a reactor system, having reduced metal impurities for the use in battery electrolyte blends, by reacting chlorine with a mixture of zinc bromide and zinc.SOLUTION: The method can be used in continuous flow or batch processing and uses a zinc bromide to aqueous solution as catalyst in a reaction with chlorine. Chlorine, whether in liquid or gas form, added into a reactor at a controlled rate, reacts with bromide to generate bromine in a much faster rate that when the zinc bromide to aqueous solution would not be present. Any un-reacted zinc is then filtered out which will ultimately result in the ultra-pure zinc bromide and zinc chloride fluid blend.SELECTED DRAWING: None

Disclosed in the present invention are a preparation method and a production system for hexafluorobutadiene. The preparation method comprises the following steps: step (1), respectively sequentially introducing an organic solution of bromotrifluoroethylene and zinc powder into a first reactor and a second reactor each filled with an initiator, zinc powder and an organic solvent for a reaction to obtain a trifluoroethylene zinc bromide solution, and then introducing the reaction solution to a sedimentation device to separate excessive zinc powder to obtain a zinc power-free trifluoroethylene zinc bromide solution, wherein the excessive zinc powder is filtered and then recycled; step (2), introducing the obtained trifluoroethylene zinc bromide solution and a pre-prepared composite catalyst solution into a third reactor for a coupling reaction to obtain a crude hexafluorobutadiene product; and step (3), purifying the obtained crude hexafluorobutadiene product to obtain a product having a purity more than or equal to 99.9%. The present invention has the advantages of a high bromotrifluoroethylene conversion rate, low coupling composite catalyst cost, mild reaction conditions, a high product purity, high safety, etc.

The invention discloses a zinc-bromine static battery aqueous electrolyte, a zinc-bromine static battery and application thereof, and relates to the technical field of battery energy storage. The zinc-bromine static battery aqueous electrolyte comprises zinc bromide, non-halogen anion zinc salt, cyclodextrin and derivatives thereof, and water. When the aqueous electrolyte is used for preparing the zinc-bromine static battery, zinc ions in high-concentration non-halogen anion zinc salt can be combined with free Br <-> to form zinc-bromine complex ions, high-concentration cyclodextrin and derivatives thereof can be combined with free Br <-> to form clathrate compounds, and the zinc ions and the cyclodextrin are matched with each other and have a synergistic effect, so that the free Br <-> in the electrolyte is efficiently reduced, and the zinc-bromine static battery is prepared. Therefore, the self-discharge performance of the zinc-bromine static battery is effectively improved. The zinc-bromine static battery can be applied to the field of large-scale energy storage.

The invention belongs to the technical field of welding, and particularly relates to a flux-cored wire with low diffusible hydrogen content in deposited metal, the flux-cored wire comprises an outer skin and a flux core, and the outer skin is prepared from a low-carbon steel strip; the flux core comprises, by mass, 2%-4% of zinc bromide powder, 18%-23% of calcium fluoride powder, 2.5%-4.5% of magnesium oxide powder, 6%-8% of nanometer titania powder, 2%-3.5% of RESiFe-41Ce rare earth ferrosilicon alloy powder, 6%-8% of nickel powder, 5%-8% of ferrotitanium powder, 6%-10% of calcium carbonate powder, 4%-8% of low-carbon ferromanganese powder and the balance reduced iron powder. The mass of the flux core accounts for 28-35% of the total mass of the flux-cored wire; the diameter of the flux-cored wire ranges from 1.5 mm to 6.0 mm. During welding, zinc bromide is added into the welding wire, so that the dehydrogenation efficiency of a molten pool is effectively improved, the diffusible hydrogen content in deposited metal is reduced, and the impact absorption energy of a welding seam is improved.