16results about How to "Short process route" patented technology

The application discloses a cleaning method for wafer regeneration and HK film removal, which comprises three sequential steps: step 1, using a mixed solution of hydrofluoric acid and hydrogen peroxide to remove dense HK film, and through the synergistic effect of hydrogen peroxide oxidation and hydrofluoric acid dissolution, the HK film is completely peeled off from the silicon substrate; step 2, using aqua regia to remove other metal films, and using the stable complex formed by chloride ions and metal ions to enhance the metal removal effect; step 3, using SC2 cleaning solution for metal control cleaning, and removing trace metal ions; after each chemical treatment, the cleaning process of ultrapure water flushing and spin-drying is adopted. The method also comprises a neutralization treatment process of waste liquid and sodium hydroxide solution. Through the above three-step sequential process, the application can realize the beneficial effects of significantly improving the film removal efficiency, greatly improving the yield, effectively controlling the damage of the silicon substrate and enhancing the environmental friendliness of the process.

The invention belongs to the field of chemical production, and discloses a method for preparing high-oil-absorption and high-reinforcement white carbon black by using fluorine-containing silicon slag, which comprises the following steps: adding liquid-containing fluorine-containing silicon slag into a hot aluminum hydroxide solution to react until the liquid-containing fluorine-containing silicon slag is clear, and adding water to dilute to obtain a solution A; heating the solution A, adding dilute sulphuric acid in stages to neutralize to a target pH value, stirring, filtering, and carrying out countercurrent washing on the silica gel with pure water until the conductivity of washing water reaches the standard; adding an organic azeotropic solvent into the desalted silica gel, heating and preserving heat, and evaporating out part of the solvent to obtain a white carbon black primary product; and calcining the primary product at 500-800 DEG C, and crushing to obtain the target white carbon black. According to the invention, high-value utilization of the fluorine-containing silicon slag is realized, and the problems of poor reinforcing effect, low oil absorption value and insufficient activity of a traditional process product are solved.

The invention relates to the technical field of chemical engineering, in particular to a method for preparing antibacterial functional core-shell silicon dioxide from fluorine-containing silicon slag, which comprises the following steps: S1, silicon slag pretreatment: mixing silicon slag with water to prepare slurry, sanding the slurry, and controlling the particle size D50 of SiO2 in the sanded silicon slag to be less than 200nm; s2, alkali activation and silicon release: mixing the sanded slurry with an alkali solution, carrying out a hydrothermal reaction, and controlling the silicon dissolution rate to be within a preset range; s3, constructing a gradient pH core shell: firstly, adjusting the pH of the system to an alkaline interval, and carrying out reaction to form a compact inner shell; adjusting the pH value of the system to an acidic interval, and adding a solution containing zinc and fluorine for reaction to form a composite shell; s4, post-treatment: washing and calcining a product obtained in the step S3 to obtain the core-shell silicon dioxide with the antibacterial function. The silicon slag is purified by a one-step method through a four-step integrated process of pretreatment, activation, gradient coating and post-treatment, and the fluorine-containing waste slag is directionally converted into a high-added-value functional material.

The application discloses a green preparation method of 4,4'-difluorobenzophenone. The method uses 4,4'-difluorobenzene as raw material, potassium bromide as catalyst, acetic acid as solvent, and oxygen as oxidant, and 4,4'-difluorobenzophenone is generated in high selectivity through one-step oxidation under mild conditions. The application surprisingly finds that in the presence of potassium bromide, a new non-metallic catalytic oxidation system of potassium bromide / acetic acid / oxygen is used to realize high-efficiency and high-selectivity conversion of the C-H bond at the benzyl position. Compared with the traditional method, the application does not need to use a transition metal catalyst, does not need to use carbon tetrachloride and other materials damaging the ozone layer, and does not need to involve a dangerous intermediate such as a diazonium salt, the process route is short, the atomic economy is high, the product yield is high, the product purity is high, the catalyst is cheap and easy to obtain, and the application has excellent industrial application prospect and green chemistry characteristics.

The present application relates to the technical field of high polymer material, and more particularly to a preparation method of nylon 11, comprising the following steps: methyl esterification: dodecanedioic acid is dissolved in methanol, and dodecanedioic acid dimethyl ester is synthesized by dehydration under the action of a first catalyst; ester exchange: dodecanedioic acid dimethyl ester, dodecanedioic acid and methanol are dissolved in an organic solvent, a second catalyst is added, and dodecanedioic acid monomethyl ester is prepared by refluxing reaction in the organic solvent; ammonia addition: 11-amino-undecanoic acid is prepared by taking dodecanedioic acid monomethyl ester as a raw material and through amide reaction and Hoffmann rearrangement; and polymerization: PA11 is obtained by high-temperature polymerization of 11-amino-undecanoic acid under nitrogen protection. The preparation method has the characteristics of short process route and stable intermediates, and can be suitable for batch production and continuous production.

The invention relates to a preparation method of a diphenhydramine hydrochloride impurity A. The invention discloses a synthesis process of 2-(diphenyloxy)-N-methylethylamine hydrochloride, which comprises the following steps: (1) under the catalytic action of a phase transfer catalyst, carrying out chlorination reaction on benzhydrol and hydrochloric acid to obtain a compound IV; (2) carrying out selective substitution reaction on the compound IV and 2-methylethanolamine to obtain a mixture of a compound II and a compound III, and carrying out column chromatography and separation to obtain an impurity II; and (3) carrying out salt forming reaction on the compound II and a hydrogen chloride solution to generate a compound I. The raw materials of the method are simple and easy to obtain, and the product yield and purity are high.

This invention provides a molybdenum concentrate circulating roasting apparatus and method, relating to the field of molybdenum concentrate roasting technology. The apparatus includes a controllable roasting reaction unit and an oxidative regeneration roasting unit. The controllable roasting reaction unit mixes molybdenum trioxide powder and molybdenum concentrate powder and roasts them to generate molybdenum dioxide and sulfur dioxide gas. The oxidative regeneration roasting unit oxidizes and roasts the molybdenum dioxide, generating molybdenum trioxide powder or molybdenum trioxide vapor at different temperature ranges. A portion of the molybdenum dioxide prepared by the controllable roasting reaction unit is transported to the oxidative regeneration roasting unit, and the molybdenum trioxide powder prepared by the oxidative regeneration roasting unit is returned to the controllable roasting reaction unit, forming a closed-loop circulation system for molybdenum-based materials.

This invention discloses a method for preparing 6-bromo-6,6-difluoro-1-hexanol, belonging to the field of organic synthesis. The method uses 4-penten-1-ol as a starting material, reacting it with dibromodifluoromethane via an addition reaction to prepare 4,6-dibromo-6,6-difluoro-1-hexanol; then, a dehalogenation reaction is carried out using a second metal reagent to obtain 6-bromo-6,6-difluoro-1-hexanol. In this method, the reactants and reagents are inexpensive and readily available, the reaction steps are short, and production control is convenient; the reaction conditions are mild, ensuring high safety; the process is simple, and the product has high purity.

The invention discloses a coating method of an electrode material, which comprises the following steps: (1) olefin-substituted imidazole and halogenated hydrocarbon are mixed for an addition reaction to form a quaternary ammonium salt type ionic liquid monomer, and the halogenated hydrocarbon is one or a mixture of several of 3-bis (bromomethyl) benzene, 1, 3-bis (bromoethyl) benzene, 1, 2-dichloroethane and benzyl bromide; (2) thermally initiating the quaternary ammonium salt type ionic liquid monomer, and carrying out polymerization reaction to form a diazolium type polymeric ionic liquid; and (3) mixing the diazolium type polymeric ionic liquid and the electrode material, and calcining to form a carbon coating layer outside the electrode material. The coating material is prepared firstly, and during coating, the electrode material is directly mixed with the coating material, so that element doping is reduced, the capacity and the cycling stability are improved, the types of the electrode materials are not limited, and the application range is wide.

The invention relates to a method for preparing an electronic-grade hydroxylamine aqueous solution by using an industrial-grade 50% hydroxylamine aqueous solution as a raw material through a microfiltration, ion exchange and nanofiltration combined technology. The method comprises the following steps: firstly, removing suspended particles and colloidal substances by microfiltration pretreatment; removing ion impurities through a specially modified ion exchange resin combined bed; and finally, deeply purifying by utilizing a nanofiltration technology to obtain a high-purity product. The method is short in process route, safe to operate and low in cost, the electronic-grade hydroxylamine aqueous solution can be stably produced, the metal ion content is lower than 10 ppt, the particle size of particles is controlled to be larger than 0.1 micrometer and smaller than 50 particles / ml, the resistivity reaches 18.2 M omega.cm, and the industrial requirements of semiconductor manufacturing, integrated circuits and display panels are met.

The application relates to the field of electrochemistry, and discloses a method for directly synthesizing lithium iron phosphate from ferrous sulfate, which comprises the following method steps: S1, configuring ferrous sulfate into a 26-40 wt% solution; S2, adding a dispersing agent into the ferrous sulfate solution; S3, adding a carbon source into the above solution, and controlling the carbon content of the lithium iron phosphate to be 1-5 wt%; S4, adding a lithium source into the above solution, and controlling the iron-lithium molar ratio to be 0.98-1.05; S5, adding a phosphorus source into the above solution, and controlling the iron-phosphorus molar ratio to be 0.965-1.02; S6, uniformly mixing the above solution, and performing granulation through spray drying; and S7, performing curve sintering on the granulated product to obtain a carbon-coated lithium iron phosphate product. Through the solution mixing mode, ferrous sulfate, a dispersing agent, a carbon source, a lithium source and other materials are mixed in multiple stages, and finally, curve sintering is performed to obtain the carbon-coated lithium iron phosphate product, and the method has a short process route and low energy consumption.

This utility model discloses a flexible circuit board based on a photosensitive insulating material. The flexible circuit board based on the photosensitive insulating material includes a first conductive layer, a first photosensitive insulating layer, a second conductive layer, a second photosensitive insulating layer, and a third photosensitive insulating layer as a substrate. The first photosensitive insulating layer covers the first conductive layer, and a first through-hole is formed on the first photosensitive insulating layer by exposure and development. The second conductive layer is disposed on the side opposite to the first photosensitive insulating layer and has a first conductive portion extending to the first through-hole. The first conductive layer and the second conductive layer are connected through the first conductive portion. The second photosensitive insulating layer and the third photosensitive insulating layer respectively cover the first conductive layer and the second conductive layer, and the second photosensitive insulating layer is located on the side opposite to the first conductive layer.

The invention provides a synthesis method of 3-(3-bromophenyl) piperidine-2, 6-diketone, which relates to the technical field of organic chemical synthesis and comprises two steps of reaction. The preparation method specifically comprises the following steps: by taking (3-bromophenyl) methyl acetate as a raw material and anhydrous tetrahydrofuran as a solvent, adding acrylamide and potassium tert-butoxide, and reacting to obtain an intermediate A; and reacting the intermediate with concentrated hydrochloric acid to obtain the target product 3-(3-bromophenyl) piperidine-2, 6-diketone. The synthesis method disclosed by the invention is short in process route, cheap and easily available in raw materials and auxiliary materials, high in reaction activity, simple to operate and easy to control, and the obtained target product is relatively high in yield and convenient for industrial amplification.

This invention provides 13 High-abundance CO was prepared by CuO catalytic oxidation. 13 This invention relates to a CO2 apparatus and method, belonging to the field of stable isotope-labeled compound preparation technology. The apparatus described in this invention is an integrated unit comprising a feed gas supply unit, a fixed-bed reaction unit, a cryogenic collection unit, a partial pressure purification unit, and a tail gas treatment unit connected in series. The fixed-bed reaction unit includes a fixed-bed reactor, a heater, and a temperature sensor. This invention utilizes high-temperature calcined modified CuO catalyst particles, combined with a composite bed structure design of "quartz wool-quartz sand-catalyst-quartz sand," significantly improving conversion efficiency and selectivity; optimizing the purification process, achieving product quality that meets high-end application standards; featuring a novel apparatus design with greatly improved sealing and stability; simple and controllable operation, facilitating industrial scale-up; and being green, safe, and environmentally friendly, aligning with industrial development trends.

The utility model discloses a kind of electric pump, thermal management system and vehicle, the electric pump includes: casing, the casing has installation cavity, one end wall of the casing is equipped with the installation port being communicated with the installation cavity;Control component, the control component is installed in the installation cavity;Heat dissipation piece, the heat dissipation piece is worn in the installation port;Bonding member, the heat dissipation piece is sealed with the casing by the bonding member Connection. According to the electric pump of the utility model embodiment, the sealing connection of heat dissipation piece and casing is realized by bonding member, which is conducive to reducing the number of parts required for electric pump, reducing cost, shortening process route, and making the material selection of heat dissipation piece and casing not affect each other, which is conducive to improving the heat dissipation effect of heat dissipation piece and reducing overall quality.