10 results about "Sodium metavanadate" patented technology

The invention discloses a catalyst for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through continuous catalytic hydrogenation and a preparation method and application thereof, the catalyst comprises a carrier, and an active component platinum and an auxiliary component which are loaded on the carrier, the auxiliary component is at least one of sodium citrate, disodium ethylene diamine tetraacetate, sodium metavanadate, oxalic acid, zirconium oxychloride, yttrium nitrate or sodium carbonate; and the active component and the auxiliary component both account for 0.1-10% of the mass of the catalyst. The catalyst is used for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through hydrogenation, the reaction can be continuous, the safety performance is better, and the catalyst has high catalytic activity and stability.

The invention belongs to the technical field of metal material micro analysis / welding processes, and particularly relates to an in-situ imaging method for the three-dimensional morphology of small-size inclusions of weld metal. According to the method, a weld metal sample is sequentially subjected to annealing, grinding and polishing, electrolysis and scanning electron microscope sample preparation, and an observable sample is obtained; wherein an organic electrolyte used for electrolysis is prepared from the following components in percentage by mass: 0.9 percent to 1.1 percent of tetramethylammonium chloride, 0.3 percent to 0.8 percent of triethanolamine, 8 percent to 12 percent of acetylacetone, 4 percent to 6 percent of glycerol, 0.4 percent to 0.8 percent of diphenylguanidine, 0.2 percent to 0.4 percent of triphenylphosphine oxide, 0.08 percent to 0.15 percent of sodium metavanadate and the balance of absolute methanol. According to the method, the three-dimensional morphology of the inclusions in the weld metal can be developed in situ.

The invention belongs to the field of vanadium chemical industry, and particularly discloses a method for preparing anhydrous sodium metavanadate by using sodium vanadium solution. The method comprises the following steps: S1, removing silicon, chromium and aluminum from the sodium modified vanadium liquid to obtain an impurity-removed liquid; s2, concentrating the impurity-removed solution to obtain a concentrated solution; s3, putting the concentrated solution into crystallization equipment, and carrying out standing crystallization at the temperature of 10-30 DEG C to obtain anhydrous sodium metavanadate crystals and post-crystallization liquid; and S4, washing and drying the anhydrous sodium metavanadate crystal to obtain the anhydrous sodium metavanadate. According to the method disclosed by the invention, the anhydrous sodium metavanadate is prepared by taking the sodium vanadium solution as a raw material through impurity removal, concentration, crystallization, washing and drying. According to the method, the anhydrous sodium metavanadate can be prepared at low cost, the purity of the prepared anhydrous sodium metavanadate product is high, the technological process is simple, operation is easy, and the requirement for equipment is low.

This invention relates to the field of galvanized steel technology, and proposes a scratch-resistant galvanized steel strip and its preparation method. The scratch-resistant galvanized steel strip comprises, from bottom to top, a steel strip, a hot-dip galvanized layer, and a passivation layer. During the preparation of the passivation layer, each 1L of passivation solution includes the following components: 5-10g sodium molybdate, 1-2g sodium nitrate, 0.1-0.3g sodium metavanadate, 0.5-0.8g titanylfluoride, and 0.2-0.5g bis(1,6-hexanetriamine)pentamethylenephosphonic acid. This technical solution solves the problems of poor scratch resistance and low surface hardness of existing galvanized steel strips.

This application discloses a method for producing acetonitrile by reacting acetate with ammonia, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and vanadate and alkali metal oxide of active components supported on the surface of the support; the vanadate is selected from at least one of bismuth vanadate, silver metavanadate, ammonium metavanadate, lithium vanadate, lithium metavanadate, sodium vanadate, sodium metavanadate, potassium vanadate, and potassium metavanadate; the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; the support is selected from at least one of silicon oxide, alumina, and molecular sieve; the mass content of vanadate is 0.1–10 wt%, and the mass content of alkali metal oxide is 0.01–5 wt%.

The invention belongs to the technical field of organic synthesis, and particularly discloses a composite catalyst and a preparation method and application thereof in synthesis of 4-cyanopyridine, the composite catalyst comprises the following components by weight: 8-10% of an active component, 1-2% of a promoter, 88-90% of a carrier, and 0.5-1% of a performance regulator; the active component is a vanadium source and comprises ammonium metavanadate, vanadium pentoxide and sodium metavanadate; the promoter is a cerium source and comprises cerium nitrate, cerium oxide and cerium oxalate; the carrier is a titanium source and comprises titanium dioxide, tetrabutyl titanate, titanyl sulfate and isopropyl titanate; the performance regulator is graphene quantum dots. According to the composite catalyst and the preparation method thereof, the composite catalyst is applied to the synthesis process of 4-cyanopyridine, a target product can be efficiently prepared in a high-selectivity and low-energy-consumption mode, and then the composite catalyst has the practical value and application potential of industrial continuous production.

This invention discloses a water-based fast-drying anti-rust paint and its preparation process and method. The paint comprises a core-shell acrylic emulsion, an acrylic phosphate emulsion, a nano-composite zinc phosphomolybdate, nano-graphene, a phytic acid-modified silicon quantum dot composite, sodium metavanadate, and additives. It has excellent long-lasting anti-corrosion, fast-drying application, and environmental friendliness, and is particularly suitable for rust prevention and protection of steel substrates in high-chlorine corrosion environments such as marine environments.

The invention discloses a macroporous ZSM-5 molecular sieve loaded heteropolyacid desulfurization catalyst as well as preparation and application thereof, and belongs to the technical field of light fuel oil desulfurization. The method comprises the following steps: adding sodium metavanadate dihydrate, sodium dihydrogen phosphate hydrate and sodium molybdate dihydrate as raw materials into an aqueous solution, adjusting the pH value to about 4, refluxing for 8 hours, cooling, extracting with diethyl ether to obtain vanadium-substituted Dawson type heteropolyacid, and adjusting the material ratio to obtain different amounts of vanadium-substituted heteropolyacid. Then, the supported catalyst POM-CNTs (at) MOF-199-ZSM-5 is prepared through a one-pot method, and the obtained catalyst is applied to oxidative desulfurization of a light fuel simulation system. Oxygen in air is used as an oxidizing agent, and the thiophene removal rate can reach 98.90% after 2.5 h at 70 DEG C.

This invention provides a method for the resource-based regeneration of waste tungsten based on low-temperature catalytic leaching, belonging to the technical field of waste tungsten resource recycling. The method includes: collecting tungsten waste, pre-treating it to obtain tungsten particles; adding a leaching agent and catalyst to the tungsten particles for low-temperature catalytic leaching, collecting the tungsten leachate after solid-liquid separation; adding oxalic acid to adjust the pH to 2.5-4.0, allowing it to stand to remove silicon and phosphorus, then adding sodium sulfide solution to remove heavy metals, obtaining a pure tungsten solution after solid-liquid separation; preparing ammonium paratungstate or tungsten trioxide from the pure tungsten solution; and performing staged reduction heat treatment to obtain regenerated tungsten powder. The leaching agent is a mixture of sodium hydroxide and hydrogen peroxide; the catalyst is a mixture of sodium metavanadate and sodium carbonate. This invention covers the entire process of tungsten waste recycling, pre-treatment, leaching, purification, product preparation, and waste recycling, with each link working synergistically to form a closed-loop industrial chain, maximizing the utilization of waste tungsten resources and avoiding resource waste.

The invention relates to a method for separating aluminum and vanadium in a sodium metaaluminate solution. According to the technical scheme, the method comprises the following steps: preheating a sodium metaaluminate solution to a certain temperature, and adding a pH regulator into the sodium metaaluminate solution; adjusting the pH value, carrying out solid-liquid separation, adding clear water into the filter cake, uniformly stirring, adding a certain amount of vanadium removal agent, carrying out hydrothermal aging under certain conditions, and carrying out solid-liquid separation on the slurry after hydrothermal aging to obtain a hydrated alumina filter cake; washing and drying the hydrated alumina filter cake to obtain an aluminum product; the filtrate is a sodium metavanadate solution. The method has the characteristics of simple process and good aluminum-vanadium separation effect, the content of V2O5 in the aluminum product is less than or equal to 0.02%, and the vanadium separation rate is more than 99.75%.