38results about "Bromide preparation" patented technology

A process for converting gaseous alkanes to olefins and liquid hydrocarbons wherein a gaseous feed containing alkanes is reacted with a dry bromine vapor to form alkyl bromides and hydrobromic acid vapor. The mixture of alkyl bromides and hydrobromic acid are then reacted over a synthetic crystalline alumino-silicate catalyst, such as an X or Y type zeolite, at a temperature of from about 250° C. to about 500° C. so as to form olefins, higher molecular weight hydrocarbons and hydrobromic acid vapor. Various methods are disclosed to remove the hydrobromic acid vapor from the higher molecular weight hydrocarbons and to generate bromine from the hydrobromic acid for use in the process.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes is thermally reacted with a dry bromine vapor to form alkyl bromides and hydrogen bromide. Poly-brominated alkanes present in the alkyl bromides are further reacted with methane over a suitable catalyst to form mono-brominated species. The mixture of alkyl bromides and hydrogen bromide is then reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrogen bromide. Various methods are disclosed to remove the hydrogen bromide from the higher molecular weight hydrocarbons, to generate bromine from the hydrogen bromide for use in the process, and to selectively form mono-brominated alkanes in the bromination step.

The invention discloses a preparation method of stable lead-free all-inorganic double perovskite A2BB'X6 nanocrystals. The method adopts a thermal injection technology to synthesize the nanocrystals,and concretely comprises the following steps: mixing a metal precursor salt, a reaction solvent oleic acid, oleylamine, octadecene and other raw materials, carrying out vacuum heating and stirring ata certain temperature for a certain period of time, rising the temperature to a suitable reaction temperature under the protection of N2, rapidly injecting the obtained hot oleate solution of A into areaction system, and then rapidly cooling the system to room temperature by using ice bath to finally obtain the A2BB'X6 perovskite nanocrystals having a uniform size. The method has the advantages of simplicity, convenient, good reappearance and environmental protection, and the obtained product has the advantages of uniform size, good dispersion, high stability and excellent photocatalytic performance, and can be applied to the fields of photocatalysis, photodetectors, laser, solar cells and the like.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes is reacted with a dry bromine vapor to form alkyl bromides and hydrobromic acid vapor. The mixture of alkyl bromides and hydrobromic acid is then reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrobromic acid vapor. Various methods are disclosed to remove the hydrobromic acid vapor from the higher molecular weight hydrocarbons, to generate bromine from the hydrobromic acid for use in the process, and to selectively form monobrominated alkanes in the bromination step.

Crystalline scintillator materials comprising nano-scale particles of metal halides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In these methods, ionic liquids are used in place of water to allow precipitation of the final product. In one method, the metal precursors and halide salts are dissolved in separate ionic liquids to form solutions, which are then combined to form the nano-crystalline end product. In the other methods, micro-emulsions are formed using ionic liquids to control particle size.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes may be thermally or catalytically reacted with a dry bromine vapor to form alkyl bromides and hydrogen bromide. Poly-brominated alkanes present in the alkyl bromides may be further reacted with methane over a suitable catalyst to form mono-brominated species. The mixture of alkyl bromides and hydrogen bromide may then be reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrogen bromide. Various methods and reactions are disclosed to remove the hydrogen bromide from the higher molecular weight hydrocarbons, to generate bromine from the hydrogen bromide for use in the process, to store and subsequently release bromine for use in the process, and to selectively form mono-brominated alkanes in the bromination step. One or more of the reactions of the processes of the present invention may be conducted in a microchannel reactor.

The present invention relates to a reaction vessel for fuel cells, and more particular to a reaction vessel capable of obtaining reaction temperature promptly at the time of initial operation and a reaction device to form a reforming device of the fuel cell using the same. The reaction device of the present invention includes a reaction vessel that includes a monolithic chain. The monolithic chain has a first wall, a second wall, and a layer of pleats interposed between the first wall and the second wall. A plurality of openings are formed on each of the top side and the bottom side of the monolithic chain. One of the first wall and the second wall being made of an insulating material. The layer of pleats is made of a conductive material, and electric power is applied to generate heat at initial reaction operation. Once the reaction is activated, the reaction vessel produces heat through an oxidation reaction.

A method for treating a resin composition which comprises kneading a resin composition comprising a part by weight of a thermoplastic resin, 0 to 0.7 parts by weight of a treating agent capable of hydrogenating a halogen and a halogenated compound at 280 to 450 °C in the presence of a metal compound which combines with a halogen atom to form a halogenated metal compound having a boilding or sublimating temperature of 450 °c or lower under atmospheric pressure, to thereby convert the halogenated compound to a halogenated metal compound, and separating the halogenated metal compound and a mixture of the thermoplastic resin with the treating agent capable of hydrogenating a halogen and recovering them. The method can be employed for treating a resin waste without converting it to a gas or an oil, to remove halgoens and metal oxides from it and recover them in a short treatment time in good yield and to recover a treated resin for reuse as a solid fuel in good yield.

Bromine containing compounds, such as calcium bromide, sodium bromide and the like, are prepared in high purity and more quickly with less waste by using a process with two bromination stages and often a third step wherein the crude product mixture can be adjusted to meet specific product requirements. In the first bromination stage, the majority, but not all, of a substrate is brominated usiung a reductive bromination reaction, the remaining unreacted substrate is converted to product in the second stage through another a reductive bromination reaction, although the specific reagents may be different, wherein the addition of bromine and a reducing agent are carefully monitored.

The invention relates to a calcium bromide preparation method, in particular to a method for preparing the oil field additive calcium bromide product by adopting the by-product, namely hydrobromic acid. The method mainly comprises the steps of: lime emulsifying, neutralisation, impurity disposal, settlement, filtering, vaporizing, condensing and discharging. The method has the beneficial effects that the preparation process is simple; the material is cheap and easy for obtaining, the manufacturing cost is reduced; the clarity of the prepared calcium bromide is high, the homogeneity of the solution is good, and the quality is up to the standard, thus having very good economic benefit.

The invention discloses a preparation method of a mercury removing bromide. According to the preparation method, hydrogen bromide gathered and separated from seawater and brine-extracted bromine enrichment liquid reacts with alkaline materials to produce the corresponding mercury removing bromide. The preparation method of the mercury removing bromide comprises the technical steps of raw liquid acidization, hydrogen bromide concentration and enrichment, neutralizing preparation and distilling mother liquid recycling, wherein the step of raw liquid acidization comprises adding concentrated sulfuric acid into the seawater and brine-extracted bromine enrichment liquid for acidization; the step of hydrogen bromide concentration and enrichment comprises distilling the acidized bromine enrichment liquid for enrichment; the step of neutralizing preparation comprises neutralizing distilled and separated hydrogen bromide through alkali or alkali metal oxide to obtain the aqueous solution of themercury removing bromide; the step of distilling mother liquid recycling comprises recycling distilling and separating mother liquid back to bromine extraction for acidizing seawater and brine. The preparation method of the mercury removing bromide is simple in process, reduces energy consumption of production of the mercury removing bromide and accordingly has a broad application prospect.

A method of recovering bromide from bromine-containing smelting ash relates to the field of high efficient separation and recovery of bromine by total wet method. It especially relates to the method of high efficiency separation of bromine salt and lead, zinc recovery of circuit board smelting ash by two-step method. It mainly comprising: sub-molten salt leaching, washing, separate Lead and zinc by adjusting the pH of industrial sulfuric acid, membrane separation and concentration, reuse of water, crude bromine salt recovery by evaporation crystallization of bromine salt. Compared with the traditional baking and recycling process of ash, the invention adopts sodium hydroxide submolten salt leaching technology and membrane separation and concentration technology, to reduce the reaction temperature and tailings discharge greatly, which has a good effect of energy saving and emission reduction.

The invention provides a chemical vapor deposition method for preparing an environment-friendly flexible resistive random access memory based on a lead-free all-inorganic perovskite thin film, and belongs to the field of nonvolatile memories. The structure of the device sequentially comprises a flexible substrate, a lower metal electrode, a lead-free perovskite resistive random access memory layerand an upper metal electrode from bottom to top. The method comprises the following steps: 1, selecting an appropriate flexible substrate, and depositing a metal conductive film on the flexible substrate to serve as a lower metal electrode; 2, adopting a chemical vapor deposition lead-free all-inorganic perovskite thin film as a resistive random access memory layer; and 3, depositing an upper metal conductive film on the surface of the resistive random access memory layer to serve as an upper metal electrode. According to the preparation method of the environment-friendly flexible resistive random access memory provided by the invention, the lead-free all-inorganic perovskite thin film is synthesized through chemical vapor deposition, and the prepared device has high bending resistance and excellent electrical properties.

A plasma etching method is performed by forming a desired pattern of a mask into a film including a zirconium oxide film by plasma etching with plasma generated from a first gas. The first gas consists of at least one chloride-containing gas of the group of boron trichloride, tetrachloromethane, chloride and silicon tetrachloride, at least one hydrogen-containing gas of the group of hydrogen bromide, hydrogen and methane, and a noble gas. An underlying film of a silicon oxide film or an amorphous carbon film is provided underneath the zirconium oxide film, and an etching selectivity of the zirconium oxide film to the underlying film is greater than or equal to one.