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3078 results about "Strong acids" patented technology

The strong acids are hydrochloric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, and chloric acid. The only weak acid formed by the reaction between hydrogen and a halogen is hydrofluoric acid (HF).

Method for extracting tungsten, titanium and vanadium from waste SCR (selective catalytic reduction) catalyst

The invention discloses a method for extracting tungsten, titanium and vanadium from a waste SCR (selective catalytic reduction) catalyst, which comprises the following steps: crushing the waste SCR catalyst, adding a strongly alkaline solution, and reacting; filtering, separating, then adding strong acid into the sodium tungstate and sodium vanadate mixed solution, and reacting to obtain tungstic acid and a sodium salt and vanadic acid mixed solution; regulating the pH value of the sodium salt and vanadic acid mixed solution until precipitate is separated out, thus obtaining ammonium vanadate; then adding sulfuric acid into the tungsten-and-vanadium-removed SCR catalyst, and reacting to obtain a titanyl sulfate solution and solids such as aluminum slag and the like; then adding water into the titanyl sulfate solution, and hydrolyzing to obtain titanic acid and a waste acid solution; and finally, respectively calcining the obtained ammonium vanadate, tungstic acid and titanic acid to obtain vanadium pentoxide, tungsten trioxide and titanium dioxide. According to the invention, tungsten, titanium and vanadium can be extracted from the SCR catalyst through the reaction with strong alkali and strong acid at a low temperature, the equipment requirement is low, the energy consumption is low, some products having added values can be coproduced, and no secondary pollution is generated, thereby facilitating popularization and application.

Preparation method of homogenized fine nano-cellulose fiber

The invention relates to a preparation method of a homogenized fine nano-cellulose fiber. The preparation method can solve the problems of uniform diameter distributor of biomass nano-cellulose prepared by the existing strong acid hydrolysis method and the high-strength mechanical shearing method, easy gathering among the nano-fiber and a narrow range of applications of the TEMPO catalytic oxidation method. The preparation method comprises the following steps: 1) extracting biomass fiber with benzyl alcohol solution; 2) carrying out treatment by using acidified sodium chlorite; 3) carrying out gradient treatment with alkaline liquor; 4) using TEMPO, sodium bromide and sodium hypochlorite for catalytic oxidation treatment; 5) using sodium chlorite for treatment; and 6) carrying out nano-scale processing by using the long-term stirring method, the ultrasonic method or the high-pressure homogenization method, drying, and then obtaining the homogenized fine nano-cellulose fiber. The fiber has the uniform diameter distribution, the diameter is 3-5nm, the length-diameter ratio is not less than 500, the fiber is mutually interwoven into a mesh snarling structure, and the method is applicable to preparing the nano-cellulose fiber by using wood pulp, paper-making pulp, wood, bamboo and crop straw.

Nitrogen-doped chitosan-based activated carbon and preparation method thereof

The invention provides nitrogen-doped activated carbon synthesized by using biomass derivative and particularly provides nitrogen-doped chitosan-based activated carbon. Chitosan is used as raw materials. The content of nitrogen in the activated carbon is 2-8wt%. The specific surface area of the activated carbon is 600-1100m<2>/g. The aperture of the activated carbon is 0.46-1.5nm. The nitrogen-doped chitosan-based activated carbon is prepared by using the chitosan as raw materials through dissolution, freeze-drying and high-temperature carbonization. By dissolving the chitosan to reduce acting force among molecules, by conducting freeze-drying to control the overall structure of chitosan dry gel and by increasing the porosity and the specific surface area of chitosan carbonization products, the nitrogen-doped chitosan-based activated carbon with large specific surface area is obtained. An environmental-friendly process of preparing high-performance activated carbon without consuming strong acid and strong alkali is realized. The traditional activated carbon preparation process which is not environmental-friendly and is high in cost because activating agents, water and the like are greatly used is avoided. The invention additionally provides a preparation method of the nitrogen-doped chitosan-based activated carbon, which has the advantages that the preparation process is simple, the equipment is simple and easy to obtain and the like.

Graphene modified high-heat-conductivity aluminum-based composite material and powder metallurgy preparation method

The invention provides a graphene modified high-heat-conductivity aluminum-based composite material and a powder metallurgy preparation method thereof. The material comprises reinforced grains and an aluminum substrate, wherein the composite boundary of the reinforced grains and the aluminum substrate contains high-heat-conductivity graphene nanosheets. The method comprises the following steps: (1) soaking the reinforced grains with a strong acid solution, subsequently washing with deionized water till being neutral, drying, and removing the surface impurities, thereby obtaining activated reinforced grains; (2) adding the activated reinforced grains into a graphene dispersion liquid, mechanically stirring or performing ultrasonic dispersion, and wrapping the graphene nanosheets on the surface, thereby preparing the graphene modified reinforced grains; and (3) mixing the graphene modified reinforced grains with the aluminum substrate powder, pressing into blanks, and sintering, thereby preparing the graphene modified high-heat-conductivity aluminum-based composite material. The composite material provided by the invention is good in chemical stability, high in thermal conductivity and can be used as a heat management material of a large-power semiconductor device.

Nano ZSM-5 molecular sieve based catalyst and preparation and use methods

The invention discloses a nano ZSM-5 molecular sieve based catalyst and preparation and use methods. The molecular sieve catalyst consists of molecular sieves and metal components, wherein the molecular sieves are nano ZSM-5 molecular sieves with a short b-axis, a medium high silica-alumina ratio, less strong acid, high Lewis acid content, and resistance to hydrothermal deactivation. The preparation method is as follows: mixing a silicon source, an aluminum source, a template agent, a structure promoter, an additive and alkali with water, and stirring to prepare a precursor solution, then crystallizing, separating solid from liquid, and calcinating to obtain molecular sieve raw powder; mixing the molecular sieve raw powder with an ammonium salt solution, stirring, filtering, mixing with the ammonium salt solution for several times, stirring, filtering, and calcinating to obtain hydrogen-type ZSM-5 molecular sieves; mixing with the metal precursor solution, drying and calcinating to obtain the aromatization catalyst. The use method is as follows: transforming oxy-compound raw materials to aromatic hydrocarbon through the catalyst under the reaction conditions. The nano ZSM-5 molecular sieve based catalyst has the characteristics of being high in aromatics yield (reaching up to 99%) and long in service life (the catalyst is alive after 300 hours, and the aromatics selectivity reaches up to 70% after the catalyst is subjected to hydrothermal aging at 760 DEG C for 4 hours).
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