192 results about "Zinc bromide" patented technology

The invention discloses a zinc / polyhalide energy storage cell. An electrode of conductive inert material and an electrolyte solution of zinc chloride solution and zinc bromide solution are used to form a zinc / polyhalide energy storage cell. The zinc / polyhalide energy storage cell employs zinc and polyhalide with small electrochemical equivalent and high hydrogen evolution overpotential are used as active substances of the cell. Anode and cathode electric pair has high potential difference, and the two together decide that the cell technology has high energy density and power density. Compared with a zinc bromine liquid flow cell, a new system energy storage cell has energy density increased by 30%, power density increased by 10%, obviously enhanced removability and reduced cost of the cell system. The anode and the cathode of the cell employ electrolytes with a same element composition to avoid negative influence on cell performance and life caused by crossed contamination of electrolytes; the cell of the invention has advantages of long cycling life, low cost and good mobility and can be widely applied to fields of energy electric power, transportation and information communication, etc.

The invention relates to a catalyst used in synthesis of propylene carbonate from carbon dioxide and propylene oxide, and a preparation method and application thereof. The catalyst comprises the following components in percentage by weight: 5 to 15 percent of zinc salt, 15 to 25 percent of organic amine and 70 percent of silicon dioxide, wherein the zinc salt, halogen and the organic amine are used as active ingredients of the catalyst; SiO2 is used as a carrier; the zinc salt is zinc chloride or zinc bromide; the organic amine is aminopropyltriethoxysilane; the SiO2 carrier is prepared from tetraethoxysilane under an alkaline condition by hydrolysis; the catalyst has specific surface of between 160 to 250m<2>/g and pore volume of between 0.7 and 0.9cm<3>/g; the conversion rate of the propylene oxide can reach 90.2 percent, and selectivity of the propylene carbonate reaches 97.5 percent; and after the catalyst is repeatedly used for 4 times, the conversion rate of the propylene oxide is 89.1 percent, and the selectivity of the propylene carbonate is 97.6 percent.

The invention provides a method for preparing hexachlorobutadiene by using 1, 1- dibromo-tetrafluoroethane, comprising: zinc powder and aprotic polar solvent are added into a reactor I protected by inert gas to lead the temperature to reach 50-90 DEG C; the 1, 1- dibromo-tetrafluoroethane is added into the reactor I within 0.5-3.5h and then reacts for 1.5-5h at the temperature of 50-120 DEG C; after that, the zinc powder reacts with the 1, 1- dibromo-tetrafluoroethane to produce trifluoro-ethylene zinc bromide; the reactor I is cooled to be room temperature, and the solution in the reactor I is added into a reactor II containing catalyst and solvent at the temperature below 1-40 DEG C within 0.5-3h and then reacts for 1-7h at the temperature of 0-60 DEG C; after the reaction, the obtained product is collected by a liquid nitrogen cold trap. The invention has the advantages of short synthetic route, simple technique, high raw material conversion rate, high yield of product and high purity of crude product, so that the product is simple to separate and purify, and the environmental pollution is reduced.

The present invention provides an aqueous electrolyte for use in rechargeable zinc-halide storage batteries that possesses improved stability and durability and improves zinc-halide battery performance. One aspect of the present invention provides an electrolyte for use in a secondary zinc bromine electrochemical cell comprising from about 30 wt % to about 40 wt % of ZnBr₂ by weight of the electrolyte; from about 5 wt % to about 15 wt % of KBr; from about 5 wt % to about 15 wt % of KCl; and one or more quaternary ammonium agents, wherein the electrolyte comprises from about 0.5 wt % to about 10 wt % of the one or more quaternary ammonium agents.

The invention discloses a method for preparing L-menthol, which comprises the following steps:(1) reacting d-citronellal in a solvent in the presence of a catalyst, and collecting isopulegol from the reaction product, wherein the catalyst is a zinc-bromide-modified NaY molecular sieve; and carrying out high-pressure hydrogenation on the obtained isopulegol to obtain the target product L-menthol. The obtained isopulegol can be subjected to high-pressure hydrogenation to obtain the target product L-menthol without purification. The invention has the characteristics of mild reaction conditions, high stereoselectivity, high yield and the like, and is simple to operate; and the catalyst is simple to recover, and can be used repeatedly. The method disclosed by the invention avoids the problems of difficulty in product purification, low yield and the like in the traditional synthesis technique of the compounds, and greatly lowers the production cost.

The invention discloses a method for preparing a cyclic carbonate by taking a NHC/ZnBr2 system as a catalyst, which comprises the step of catalyzing epoxide and carbon dioxide to synthesize the corresponding cyclic carbonate by cycloaddition by taking the NHC/ZnBr2 system consisting of N, N'-(2,6-diisopropylphenyl)-imidazoline hydrochloride, potassium carbonate and zinc bromide as the catalyst, wherein the reaction pressure is 0.1 MPa, the reaction temperature is 80 DEG C, the reaction time is 24 h and the reaction solvent is DMSO. The synthesis method has the characteristics of mild reaction condition, high catalytic activity, single product, simplicity in purification operation and the like.

In an embodiment of the present disclosure, a method for fabricating a sugar product is provided. The method includes mixing formic acid and lithium chloride, magnesium chloride, calcium chloride, zinc chloride or iron chloride or lithium bromide, magnesium bromide, calcium bromide, zinc bromide or iron bromide or heteropoly acid to form a mixing solution, adding a cellulosic biomass to the mixing solution for a dissolution reaction, and adding water to the mixing solution for a hydrolysis reaction to obtain a sugar product. The present disclosure also provides a sugar product fabricated from the method.

The invention discloses a preparation method of hexafluorobutadiene. The preparation method includes the following steps that (1) a hydrogenation reaction is carried out with trifluorochlor oethyleneas raw materials under the action of a first catalyst to obtain trifluoroethylene; (2) the trifluoroethylene is introduced into a bromination reactor for conducting a bromination reaction with brominein the reactor, 1,2-dibromo-1,1,2-trifluoroethane is obtained, and then trifluorobromoethylene is obtained by dehydrobromination; (3) the trifluorobromoethylene reacts in a reactor containing a solvent, an initiator and zinc powder to generate zinc reagent trifluorovinyl zinc bromide; and (4) the zinc reagent trifluorovinyl zinc bromide is coupled under the action of a second catalyst to obtain the hexafluorobutadiene. The preparation method has the advantages of low energy consumption, high yield, high reaction efficiency and the like.

The invention relates to a new method for preparing hexafluorobutadiene. The new method is characterized by comprising the following steps that 1, HFC-134a and Br2 are subjected to a continuous gas phase catalysis reaction under the effect of a catalyst with metal chloride or bromide as an active component to prepare CF3CFBr2; 2, CF3CFBr2 is dripped into a reactor for aprotic polar solvent in which zinc powder is dissolved to prepare trifluoro vinyl zinc bromide; 3, with ferric salt and copper salt serving as catalysts, in the aprotic polar solvent, trifluoro vinyl zinc bromide is subjected to a telomerization reaction to generate a target product hexafluorobutadiene. The refrigerant HFC-134 a and Br2 which are used on a large scale at present and gradually obsoleted are used as starting raw materials, the materials are easy to obtain and low in price, the reaction is carried out under the gas phase condition, the reaction condition is easy to control, and the method is a C4F6 preparing method having a great market application prospect.

The invention provides a method for synthesizing methyl dihydrojasmonate. 2-pentyl cyclopentenone is adopted as a raw material; the raw material and allyl zinc bromide are subjected to 1,4-Michael addition to form 2-pentyl-3-allyl cyclopentanone; the 2-pentyl-3-allyl cyclopentanone is oxidized by sodium periodate in the presence of a ruthenium trichloride hexahydrate catalyst to synthesize dihydrojasmonic acid; and then the dihydrojasmonic acid is esterified to form the methyl dihydrojasmonate. The raw material of the method is cheap and low in cost; the process is simple and convenient in operation; the reaction conditions are mild and easy to control; the synthesis route is short and the synthesis period is reduced greatly; and the reaction product is single, high in yield (up to 65 to 85 percent), less in environmental pollution, and environmentally-friendly.

The invention discloses a supported catalyst, its preparation method and application. The supported catalyst is composed of zinc oxide, zinc bromide, additive oxide and magnesium-modified hydrogen-type ZSM-5 molecular sieve carrier. According to the weight content of the catalyst, the content of zinc oxide is 0.5%-20%. The zinc content is 10%-50%, and the weight content of the auxiliary oxide in the catalyst is 0.1%-10% in terms of metal elements. The preparation method of the catalyst comprises the following process: (1) treating the hydrogen ZSM-5 molecular sieve with a magnesium salt solution to obtain a magnesium-modified ZSM-5 molecular sieve carrier; (2) introducing zinc oxide into the magnesium-modified hydrogen Type ZSM-5 molecular sieve carrier; (3) carry out bromination treatment on the carrier after introducing zinc oxide; (4) prepare auxiliary oxide; (5) introduce auxiliary oxide into step (3) brominated in the material. The catalyst can convert methyl bromide into isobutene with high selectivity.

The invention relates to a preparation method of a silicon-based material by taking alloy as a reducing agent. The method comprises the steps of taking silicon dioxide as a precursor, mechanically mixing an alloy reducing agent and a low-melting-point salt, pressing a block, and performing sintering in a vacuum or inertia atmosphere at 150-600 DEG C for 2-10 hours; and washing the product with hydrochloric acid and water, and drying the product to obtain the silicon-based material, wherein the silicon dioxide is one of MCM-41, MCM-48, MCM-50 and SBA-15, the alloy reducing agent is one of magnesium alloy and aluminum alloy, the magnesium alloy is one of magnesium aluminum, magnesium lithium, magnesium calcium and magnesium sodium, the aluminum alloy is one of aluminum sodium, aluminum lithium, aluminum calcium and aluminum potassium, the low-melting-point salt is one of aluminum chloride, aluminum bromide , zinc chloride and zinc bromide, the mole ratio of alloy and the silicon dioxide is 2-4, and the mole ratio of the low-melting-point and the silicon dioxide is 3-10. The silicon-based material prepared by the method is small in particle size, is of a porous structure, can be used for a lithium ion battery negative electrode material or a portable hydrogen preparation material, and has very good application prospect.

The invention discloses a preparing method used for a flow microsphere zinc electrode of a secondary zinc battery. Zinc-plated conducting microspheres are highly distributed in flow electrolyte consisting of zinc salt solution of zinc bromide and zinc chloride, quaternary ammonium salt and hydrobromic acid solution, and the zinc-plated conducting microspheres and a three-dimensional mesh current-collection body commonly constitute the flowable microsphere zinc electrode, wherein the zinc-plated conducting microspheres are prepared by the following steps that: 50-200mum-diameter conducting microspheres are placed in a cathode region of an electrolytic tank to be electroplated and are stirred at the same time so that plating layers of the microspheres are uniform, the microspheres with the moderate thickness of the plating layers can be obtained through time control, zinc-plated solution consists of Zn<2+> with the concentration being 3-25g/L and NaOH with the concentration being 15-180g/L, the cathode-current density is 0.5-4.0A/dm<2>, and the temperature is 10-40 DEG C. According to the preparing method, the deformation and the pine-tree crystal of a solid zinc polar plate in the charging and discharging processes of the zinc electrode and the dropping of active substances caused by the deformation and the pine-tree crystal can be effectively avoided, thereby improving the performance of the zinc electrode of the zinc battery obviously and realizing large-current charging and discharging.

It has been discovered that carbonate powders and bicarbonate powders are useful to increase the pH and corrosion resistance of high-density brines, such as zinc bromide brines, without significantly reducing their densities. The carbonates and/or bicarbonates should be water-soluble and may be sodium, potassium, magnesium and/or ammonium carbonates and/or bicarbonates and the like. The carbonates and/or bicarbonates are easily added in powder or other finely divided solid form.

The invention discloses a method for synthesizing gamma-undecalactone, which belongs to a synthesis technology of the gamma-undecalactone. The method takes n-octanol as a solvent, boric acid or zinc bromide as a catalyst, acrylic acid as a raw material and di-t-butyl peroxide or dibenzoyl peroxide as an initiator, and comprises the following steps: firstly, adding partial n-octanol and the catalyst into a reaction kettle to be mixed and heated; secondly, mixing the remaining n-octanol, the initiator and the acrylic acid and dipping the mixture into the reaction kettle; thirdly, making the mixture react for a period; and finally obtaining reaction liquid containing the gamma-undecalactone. The method has the advantages that the reaction is carried out at normal pressure, byproducts of tert-butyl alcohol are easy to discharge from a system during the reaction process, and simultaneously the equipment used by the method is simple, the synthesis cost is low and the yield of the gamma-undecalactone is high.

The invention discloses an ultralow-mercury catalyst, and particularly relates to a catalyst with the ultralow content of mercuric chloride and suitable for acetylene hydrochlorination to synthesize chloroethylene. The catalyst comprises a main activity component, auxiliary component A metal bromide, auxiliary component B metal bromide and carriers, wherein the main activity component is mercuric chloride, and the content of the mercuric chloride accounts for 0.5-4% of the total mass of the catalyst carriers; the auxiliary component A metal bromide includes one or more of cupric bromide, cobaltous bromide, manganous bromide, nickel bromide and zinc bromide, and the metal element content of the auxiliary component A metal bromide accounts for 0.1-15% of the total mass of the catalyst carriers; the auxiliary component B metal bromide includes one or more of potassium bromide, barium bromide, sodium bromide and lithium bromide, and the metal element content of the auxiliary component B metal bromide accounts for 0.01-10% of the total mass of the catalyst carriers; the carriers include activated carbon with the specific surface area of 300-2500 m<2>/g and molecular sieve, or silica gel, or zeolite or kieselguhr. While activity and stability of the ultralow-mercury catalyst are ensured, the mercury resource in the catalyst is brought into full play to reach the maximum use efficiency, and the novel ultralow-mercury catalyst is environmentally friendly.

The invention discloses an electrolyte used for a zinc bromine flow battery. The electrolyte used for the zinc bromine flow battery disclosed by the invention comprises an anode electrolyte and a cathode electrolyte. Each of the anode electrolyte and the cathode electrolyte consists of the following components: zinc bromide, zinc chloride, a complexing agent, a dendritic crystal resistant agent, awetting agent and water. Compared with the prior art, the complexing agent, the dendritic crystal resistant agent and the wetting agent are added into the electrolyte used for the zinc bromine flow battery, so that the electrolyte used for the zinc bromine flow battery can improve the current efficiency and energy efficiency of the battery.

A soldering paste flux for use in soldering copper and copper alloy piping and the like is formed of 40–70% nonylphenol ethoxylate (preferably Tergitol NO-10® made by Dow Chemical), 10–30% glyceryl monostearate, 3–10% acid activator, 3–10% water, and 4–15% mineral salt. The acid activator is preferably a mineral acid and, most preferably, hydrobromic acid. The mineral salt is preferably zinc bromide.