6results about "Bromide preparation" patented technology

Provided is a preparation method of (5-fluoro-2, 3-dihydrobenzofuran-4-yl) methylamine or a salt thereof, which uses 4-fluoro-3-methylphenol as the starting material, and is carried out through the steps of bromination, O-alkylation, cyclization, bromination, azidation or ammonolysis, and reduction. The reaction route has simple synthesis process, convenient operation, high yield, and is environmentally friendly. The prepared (5-fluoro-2, 3-dihydrobenzofuran-4-yl) methylamine can be used as an intermediate in pharmaceuticals and fine chemicals.

The various embodiments of the disclosure relate generally to a process for converting industrial hydrohalide solutions to commercial metal halide solutions having a sufficient quality in terms of impurity content and color. An embodiment of the disclosure can include the steps of identifying a hydrohalide solution having organic and / or inorganic impurities neutralizing the hydrohalide solution with a basic material in one or more steps toa neutral or alkaline pH to produce a metal halide solution, filtering the metal halide solution to remove any alkaline insoluble impurities, and then adjusting pH of the metal halide solution to a pH of about 6.5 to about 8.

The invention discloses a halide nano-material, a preparation method and an application in a solid-state battery, and the preparation method comprises the following steps: carrying out wet ball-milling synthesis on a halide raw material, drying, carrying out three-stage gradient heating control in an inert atmosphere, cooling, crushing and screening to obtain the size-controllable halide nano-material, the specific three-stage gradient heating control is as follows: the first heating stage is a low-temperature desorption stage, and the temperature is increased from room temperature to 120-170 DEG C; the second heating stage is a medium-temperature crystallization stage, and the temperature is increased from 120-170 DEG C to 200-220 DEG C; and the third heating stage is a high-temperature densification stage, and the temperature is increased from 200-220 DEG C to 250-300 DEG C. According to the invention, the particle size change is substantially controllable, finally the beneficial effects that the particle size D50 is less than or equal to 0.9 mu m and the deviation is less than or equal to 5% are realized, the problem of high particle size dispersity of the existing synthesis method is overcome, the morphology and dispersity of the nano material are improved, the particle bulk density is increased, the interface contact resistance is reduced, and the preparation method is simple and convenient. The problem that the macroscopic particle interface compatibility is poor is solved.

The invention provides a method and a system for synthesizing bromo-carbene by using tetrabromobisphenol A production wastewater, and belongs to the technical field of flame retardants. After the tetrabromobisphenol A production wastewater is subjected to evaporation concentration and pH adjustment, a mixed salt solution with high organic concentration is obtained, and the mixed salt solution with high organic concentration reacts with bromo-carbene in the presence of a catalyst, so that bromo-carbene is synthesized. According to the method, a plurality of complex organic mixtures in the wastewater are subjected to a series of chain scission recombination step by step through three times of oxidation in sequence and accurate condition control, and finally, a large number of various brominated organic compounds contained in the tetrabromobisphenol A production wastewater are converted into single-chain bromine-containing organic substances. And high-activity organic matter bromo-carbene and inorganic sodium bromide salt are generated through a synthesis reaction, so that the resource utilization of the bromine element in the wastewater is realized, the utilization value of the wastewater is improved, and a new treatment path is provided for difficult wastewater treatment generally existing in tetrabromobisphenol A production.

The invention provides a method for producing a purified fluorine-containing gas composition capable of inhibiting Cr from being mixed into a surface to be processed during etching, a method for producing a semiconductor device using the method for producing the purified fluorine-containing gas composition, and an etching apparatus. The present invention relates to a method for producing a purified fluorine-containing gas composition, comprising a contact step for bringing a crude fluorine-containing gas composition containing a fluorine-containing gas composition containing 98 vol% or more of fluorine-containing molecules other than hydrogen fluoride and having a Cr concentration of 100 ppb by mass or less into contact with a solid metal fluoride at 30 DEG C or less.