43 results about "Vanadium Compounds" patented technology

The invention relates to the technical field of catalysts for synthesizing ethylene propylene rubber, and discloses a vanadium-based catalyst composition and a preparation method and application thereof.The vanadium-based catalyst composition comprises a vanadium catalyst, an organic aluminum compound and an activation accelerant, and the preparation method of the vanadium catalyst comprises the steps that a salicylaldehyde compound is dissolved with methyl alcohol or ethyl alcohol; and adding an organic amine compound while stirring, adding a vanadium compound after reaction, and continuously reacting to obtain the vanadium catalyst. When the prepared vanadium catalyst composition is applied to ethylene and propylene copolymerization reaction, the reactivity rate of ethylene and propylene monomers can be adjusted according to the structure of the vanadium catalyst, the C3 content of the prepared ethylene propylene rubber is 26.2-36.4 wt%, the double bond content of ethylene propylene diene monomer is adjustable in the range of 3.7-15.2 wt%, and post-processing application is facilitated.

The present invention belongs to the field of chemical engineering. Disclosed are an acrylonitrile catalyst, and a preparation method therefor and the use thereof. The preparation method comprises: (1) mixing solutions of a molybdenum compound and a bismuth compound at an Mo / Bi molar ratio of 0.5-1.5 to prepare bismuth molybdate containing an α-phase and / or a γ-phase; (2) synthesizing a pentasil-type molecular sieve having an Si / V molar ratio of 50-150 from a silicon source, an organic amine, and a vanadium compound; (3) mixing a silica sol with a molybdenum compound solution at an Si / Mo molar ratio of 0.5-1, then sequentially adding solutions of a nickel, a tungsten, and a thallium compound, and phosphoric acid, the molecular sieve, and the bismuth molybdate thereto, such that the ratio of the weight percentages of Mo, Bi, Ni, W, Tl, V, and P in the catalyst, on the basis of oxides, is (37-38):(4-6):(3-5):(2-3):(0.2-0.3):(0.1-0.3):(0.7-0.8); (4) adding SiO2 powder thereto, such that SiO2 accounts for 45 wt% to 55 wt% of the catalyst; and (5) pulping and homogenizing the resulting mixture, then spray molding same at an outlet temperature of 150-180°C, and calcining same in an air atmosphere at 550-680°C for 1-6 h. The catalyst has a good activity, selectivity and stability, and is wear-resistant.

The application relates to a high-purity VOSO4 electrolyte preparation method and relates to the technical field of vanadium compound production. The short-process technology of medium-temperature ignition, low-temperature chlorination, rectification and acidification reduction is used to efficiently extract vanadium from vanadium-containing stone coal, and the technical effect of low energy consumption and almost no pollution is realized; the process also has the characteristics of simple separation method, no need of complex extraction, high product purity, good electrolyte performance and the like, and has the advantages of short process, low energy consumption and near-zero pollution, and opens up a new way for clean production of vanadium resources.

The present invention relates to a method for preparing a nanometer sodium vanadium phosphate material, comprising the following preparation steps: 1) weighing raw materials, the raw materials consisting of a tetravalent vanadium compound, a sodium phosphate salt and sodium fluoride, or the raw materials consisting of a tetravalent vanadium compound and a sodium phosphate salt; and 2) placing the raw materials in a high-speed homogenizing mill to complete a rapid nucleation process and control a crystal growth process. The present invention takes use of the principle of atom economy, and uses the milling device having a high power and a high rotation speed to perform efficient preparation of the nanometer sodium vanadium phosphate. The present invention achieves efficient atom utilization of the raw materials, and avoids generation of unnecessary waste materials and waste of the raw materials, which omits waste liquid treatment steps involved in solvent emission and washing processes, thereby achieving green preparation. On the basis of the milling device having a high power and a high rotation speed, high-speed collision is achieved to accelerate the reaction and to efficiently control the particle size of the product, thereby achieving nano-scale preparation. The present invention has the advantages of simple operation, high efficiency, easy industrial scale-up production and the like and helps to promote the research, popularization and application of the sodium vanadium phosphate material in the field of electrochemical energy storage.

The application provides a method for preparing a heterocyclic aromatic amide by hydrolyzing a heterocyclic aromatic nitrile with a vanadium catalyst, and belongs to the technical field of fine chemicals. The method is a new method for preparing a heterocyclic aromatic amide by hydrolyzing a heterocyclic aromatic nitrile as a raw material with a vanadium-based material as a catalyst. The vanadium-based material is prepared by mixing amine groups in an organic amine and vanadium substances in an inorganic vanadium compound at a mass ratio of 1:1-1:6, calcining under the condition of 300-1000 DEG C in an inert atmosphere for 0.5-20 h, and cooling, and can efficiently catalyze the hydrolysis of a heterocyclic aromatic nitrile into a corresponding amide. The method has the advantages of mild reaction conditions, few by-products, and easy separation of the catalyst and the product from the reaction system, and has strong practicability and broad application prospect.

The invention provides a preparation method of a vanadium-phosphorus-oxide catalyst, the vanadium-phosphorus-oxide catalyst and application of the vanadium-phosphorus-oxide catalyst, and relates to the technical field of preparation of maleic anhydride through butane oxidation. The preparation method of the vanadium phosphorus oxide catalyst comprises the following steps: mixing a pentavalent vanadium compound, a pentavalent phosphorus compound, a first cocatalyst and an organic alcohol solution, and reacting to obtain a first precursor; carrying out first-stage calcination on the first precursor in an inert atmosphere or a vacuum condition, and then carrying out second-stage calcination in an oxygen-containing atmosphere to obtain a second precursor; placing the second precursor in a solution containing a second cocatalyst, and carrying out dipping treatment to obtain a third precursor; and mixing the third precursor with a lubricant, carrying out molding treatment, and then carrying out activating treatment to obtain the vanadium phosphorus oxide catalyst. The vanadium phosphorus oxide catalyst prepared by the preparation method of the vanadium phosphorus oxide catalyst has high activity, high selectivity and good stability, and the method is suitable for industrial production.

The invention relates to the use of ecologically sustainable catalysts not previously applied in the field of agriculture, and to related methods, by means of which a higher rate of atmospheric nitrogen fixation can be achieved and agriculturally advantageous effects can be realized while simultaneously avoiding the harmful effects associated with conventional nitrogen fertilization. More specifically, the invention relates to the novel agricultural application of dissociated vanadium ions possessing redox potential, and to related methods. The method according to the invention is suitable for increasing the yield and biomass of plants, the essence of which lies in applying vanadium to the plant growth medium, to the plant, or to both, in order to enhance the nitrogen-fixing capability of microorganisms capable of fixing atmospheric nitrogen.

The invention discloses a C6 compound, application and a vanadium removal method, the C6 compound is obtained by reacting olefin and TiCl4 at 120-160 DEG C, the volume ratio of the olefin to the TiCl4 is (15-25): (1-5), and the olefin is alpha-olefin or isoprene with the carbon atom number larger than or equal to 9. The C6 compound has a good vanadium removal effect, does not cause the problem of high carbon content impurities in refined TiCl4, does not generate wall-adhered residues to block equipment in a vanadium removal process, is easy to clean, and has a vanadium removal rate of 99.62%; the recycled C6 compound can be reutilized, namely can be used for recycling vanadium-containing compounds, and can also be used for vanadium removal experiments again after being treated.

The invention relates to a preparation method of a catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran, and belongs to the technical field of catalyst preparation. The preparation method specifically comprises the following steps: dissolving a vanadium-containing compound serving as a main component of the catalyst and oxalic acid serving as a pore-forming agent into deionized water; heating and hydrolyzing the solution to completely evaporate water to obtain a solid; and roasting the solid in an air atmosphere to obtain the catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

The invention relates to the technical field of chemical purification, in particular to a vanadium pentoxide preparation method and vanadium pentoxide, and the vanadium pentoxide preparation method comprises the following steps: mixing vanadium pentoxide to be purified with a sodium hydroxide solution, and carrying out a liquid-phase oxidation reaction under the condition of introducing oxygen to obtain a first mixed solution; adding calcium oxide to carry out precipitation reaction to obtain calcium sediment, and carrying out ammonium conversion reaction in a carbon dioxide atmosphere to obtain a second mixed solution; adjusting the pH value and carrying out crystallization reaction to obtain ammonium polyvanadate crystals; and carrying out calcination treatment to obtain vanadium pentoxide. According to the method, a sodium hydroxide-oxygen-vanadium pentoxide liquid-phase oxidation system is constructed, and full oxidation and deep conversion of the low-valence vanadium compound are realized by utilizing the synergistic effect of the autocatalytic free radical reaction initiated by oxygen microbubbles and vanadium ions in the low-valence vanadium compound, so that a high-purity vanadium pentoxide product is obtained. The method has the advantages of high oxidation efficiency, obvious impurity removal effect, high yield and the like.

The present application relates to the technical field of vehicles, and specifically discloses a shift method and device for protecting vanadium-based SCR, a vehicle and a storage medium, wherein the shift method for protecting vanadium-based SCR, after determining that a temperature protection condition judgment enabling condition is met, obtains an actual temperature upstream of the SCR, a target temperature of an SCR temperature control model, a change rate of the target temperature, and road condition information in a set region in front of the vehicle; then, whether the temperature protection condition is met is evaluated based on the actual temperature upstream of the SCR, the target temperature, the change rate of the target temperature and the road condition information, and when the temperature protection condition is met, the gear of the vehicle is downshifted, and the SCR temperature is increased through downshifting, thereby preventing the leakage of vanadium-containing compounds. When judging whether the temperature protection condition is met, the shift method for protecting vanadium-based SCR simultaneously refers to the actual temperature upstream of the SCR, the target temperature and the change rate of the target temperature, can objectively reflect the current state of the SCR, and ensures the accuracy of the control result.

The invention relates to a vanadium-containing molecular sieve catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran and a preparation method, and belongs to the field of vanadium-containing molecular sieve catalysts for catalytic oxidation of 2-methyltetrahydrofuran. The preparation method specifically comprises the following steps: taking a silicon-aluminum-sodium microporous molecular sieve as a precursor, carrying out ion exchange by adopting an aqueous solution of a vanadium-containing compound, washing with water, drying, and roasting to prepare the vanadium-containing molecular sieve catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

Providing a metal surface treatment agent capable of high-temperature firing and capable of imparting high corrosion resistance to a metal substrate. A metal surface treatment agent comprising a silicate compound (A); an alkali metal salt (B) other than a silicate compound, other than a vanadium compound, and other than a zirconium compound; a vanadium compound (C); a zirconium compound (D); and water, wherein the silicon element content is 10 mass% or more with respect to the total solid content of the metal surface treatment agent. Preferably, the silicate compound (A) is an alkali metal silicate.

The present invention belongs to the technical field of inorganic pigment production, and particularly relates to a method for in-situ preparation of bismuth vanadate composite pigment. This preparation method involves first dissolving a bismuth compound in an acidic solution, adding a surfactant to dissolve the compound thoroughly, and then adding nickel titanium yellow particles to the mixture. A vanadium compound is then added to the mixture under strong shearing force, and the mixture is allowed to react at a predetermined temperature and pH. The precipitate separated from the mixture is washed, dried, and then heat-treated to obtain a bismuth vanadate composite pigment powder. Under strong shearing force, the synthesis reaction of bismuth vanadate can be carried out uniformly in-situ on the surface of nickel titanium yellow. This method allows for faster and more uniform in-situ synthesis and avoids the need for large amounts of basic solution in conventional methods. The resulting bismuth vanadate composite pigment has high chromaticity, superior hiding power, and tint color intensity. The method of the present invention is green and efficient, achieves uniform reaction, and produces excellent product performance, making it suitable for industrial continuous production.

The application belongs to the field of phosphate inorganic material preparation, and relates to a method for preparing titanium-vanadium doped iron phosphate, which comprises the following steps: adding titanium and / or vanadium compounds into an iron phosphate complex solution to prepare an iron phosphate complex solution containing titanium and / or vanadium doped metal compounds, and then adding water into the mixed solution and heating to obtain titanium and / or vanadium ion doped iron phosphate; the titanium compound is selected from metatitanic acid, nano titanium dioxide, titanyl sulfate, titanyl oxalate, titanium citrate, titanium lactate or titanium tartrate; the vanadium compound is vanadium trioxide, vanadium dioxide (IV), vanadium pentoxide, vanadium monoxide, vanadium sulfate or vanadium trichloride. In addition, alternative solutions of adding sequence and adding timing change are provided. The application has simple process, is suitable for large-scale industrial production, and improves the electrochemical performance of lithium iron phosphate material in a power battery.

The invention provides a method for preparing bimodal / wide molecular weight distribution polyethylene by using a single reactor, which comprises the following steps of: catalyzing ethylene homopolymerization or copolymerization of ethylene and alpha-olefin by using a hydrocarbon solvent as a dispersing agent and using a vanadium polyethylene catalyst and aluminum alkyl as a main catalyst and a cocatalyst respectively, hydrogen is used as a polymer molecular weight regulator in the reaction process; wherein the vanadium polyethylene catalyst comprises a magnesium-containing carrier and a vanadium compound loaded on the magnesium-containing carrier, the total weight of the vanadium polyethylene catalyst is 100%, the mass content of active metal vanadium is not less than 3.8%, the average particle size of the vanadium polyethylene catalyst is 9.0-13.5 [mu] m, and the particle size distribution SPAN value is less than 1. The vanadium polyethylene catalyst used in the invention has higher polymerization activity, and the obtained polymer has higher apparent density and lower fine powder and oligomer, and can be used for developing special resins for high-strength films, pressure-resistant pipes and the like.

Provided is a metal surface treatment agent that enables high-temperature sintering and imparts high corrosion resistance to a metal base material. A metal surface treatment agent contains a silicic acid compound (A), an alkali metal salt other than the silicic acid compound, a vanadium compound, and a zirconium compound, and the content of silicon is 10% by mass or more relative to the total solid content of the metal surface treatment agent. The silicic acid compound (A) is preferably an alkali metal silicate.

The invention belongs to the field of preparation of phosphate inorganic materials, and relates to a method for preparing titanium-vanadium doped iron phosphate, which comprises the following steps: adding a titanium and / or vanadium compound into an iron phosphate complex solution to prepare an iron phosphate complex solution containing a titanium and / or vanadium doped metal compound; adding water into the mixed solution, heating to obtain titanium and / or vanadium ion doped iron phosphate, and the titanium compound is selected from metatitanic acid, nano titanium dioxide, titanyl sulfate, titanyl oxalate, titanium citrate, titanium lactate or titanium tartrate; and the vanadium compound is vanadium trioxide, vanadium dioxide (IV), vanadium pentoxide, vanadium monoxide, vanadyl sulfate or vanadium trichloride. In addition, the invention also provides an alternative scheme for changing the adding sequence and the adding opportunity. The method is simple in process and suitable for large-scale industrial production, and the electrochemical performance of the power battery of the lithium iron phosphate material is improved.

The present invention relates to catalytic compositions and curable compositions containing them; the catalytic compositions of the present invention consist essentially of: (i) a metal compound; and (ii) a compound other than (i) that catalyzes an addition reaction between an ethylenically unsaturated compound and a thiol, wherein said catalytic composition is essentially free of vanadium compounds; the curable compositions according to the present invention comprise: (a) a polyene, (b) a polythiol, and (c) a catalytic component, which consists of the above-mentioned catalytic composition.

The invention belongs to the technical field of vanadium compounds, and particularly relates to a sodium vanadate single crystal, a sodium vanadate composite metal single crystal, vanadium pentoxide and a preparation method and application of the sodium vanadate single crystal and the sodium vanadate composite metal single crystal. Vanadium in a system is adjusted to exist in a pentavalent form mainly by adjusting the pH value of the vanadium-sodium leaching solution and the pH value of a mixed system of the vanadium-sodium leaching solution and potassium salt, magnesium salt or cobalt salt, and high-purity large-size single crystals are directly obtained from the leaching solution at the specific crystallization temperature. According to the method, high-purity and large-size single crystals are used as raw materials, the high-purity vanadium pentoxide is obtained through calcination after ammonium salt vanadium precipitation, and the requirements of aviation, aerospace and other special industries for high-purity vanadium products can be met. The preparation method provided by the invention has the advantages that the process is simple, the cost is low, and a high-purity vanadium product can be directly extracted from the vanadium leachate. According to the method, the existence form and solubility of vanadium (V) are controlled by adjusting the pH value and temperature of a solution system, so that efficient crystallization and purification of vanadium compounds are realized.

The invention discloses a preparation method of low-polymerization-degree polyvinyl alcohol acetal, which comprises three core processes of low-polymerization-degree polyvinyl alcohol preparation, acetalation reaction and precise post-treatment: (1) a low-polymerization-degree stage: precise degradation of polyvinyl alcohol is realized by using a vanadium compound-organic phosphine ligand composite catalytic system in combination with hydrogen peroxide dropwise added at a constant flow, after the reaction, the deep removal of vanadium ions is realized through chelating by a chelating agent and filtering; (2) acetalation stage: adopting a sulfuric acid-p-toluenesulfonic acid composite catalyst to cooperate with a phase transfer catalyst to improve the reaction efficiency, and adding a reducing agent to remove residual hydrogen peroxide; and (3) post-treatment stage: optimizing the impurity removal effect through normal-temperature-high-temperature segmented washing. The polymerization degree of the product is 320-350, the distribution coefficient is 1.1-1.3, the vanadium residue is less than or equal to 0.0005%, the light transmittance is greater than or equal to 92.8%, the acetalation degree is 68-75%, the fluctuation is less than or equal to + / -1%, and the problems of out-of-control coloring and polymerization degree, low efficiency and high impurity content in the prior art are solved.

This invention belongs to the field of high-purity titanium tetrachloride refining technology, specifically relating to a catalytic organic additive, its preparation method, and its application. The catalytic organic additive is composed of organic base oil, alkanes, cycloalkanes, aromatics, and metal oxides in a specific mass ratio, with the following mass ratios: 40–70: 2–10: 10–40: 5–10: 2–10; wherein the organic base oil is glycerol, the alkanes are naphtha, the cycloalkanes are cyclohexane, the aromatics are C9 aromatics, and the metal oxide is alumina. This invention enables the organic additive to possess excellent catalytic cracking performance; in the vanadium removal process of high-vanadium titanium tetrachloride, it can rapidly react with vanadium compounds, significantly improving vanadium removal efficiency while greatly reducing the unit dosage of the organic additive used for vanadium removal. It combines process applicability and economy, and is suitable for the refining stage of high-vanadium titanium tetrachloride in the production of titanium dioxide and sponge titanium.

Provided is a surface treatment liquid for a zinc-plated steel sheet, which is capable of producing a zinc-plated steel sheet with a surface treatment coating having excellent long-term perspiration resistance, corrosion resistance in a flat plate section, and the like, and which has excellent storage stability. A surface treatment liquid for a zinc-plated steel sheet according to the present invention is characterized by comprising a first surface treatment liquid (X) and a second surface treatment liquid (Y), the first surface treatment liquid (X) containing a glycidyl group-containing silane coupling agent (A), a tetraalkoxysilane (B), a zirconium carbonate compound (C), sodium silicate (D1), a vanadium compound (E), a molybdic acid compound (F) and water, and the contents of the components satisfying a predetermined relationship. The second surface treatment liquid (Y) contains sodium silicate (D2), an anionic polyurethane resin (G), and water, and the content of each component satisfies a predetermined relationship.

A quality optimization method for preparing a vanadium / phosphorus mixed oxide catalyst, a quality optimization method for preparing a vanadium / phosphorus mixed oxide catalyst (VPO catalyst) containing crystalline vanadyl pyrophosphate, the method comprising the steps of: (a) preparing a VPO catalyst precursor containing vanadium oxyhydrogen phosphate, the invention relates to a method for producing a VPO catalyst precursor by reacting a mixture containing a vanadium-containing compound, preferably vanadium pentoxide, and a phosphorus-containing compound, preferably phosphoric acid or polyphosphoric acid, and optionally a promoter metal compound, in an alcohol medium, (b) pre-calcining the VPO catalyst precursor, (c) optionally shaping the VPO catalyst precursor, (d) calcining the VPO precursor in an oxygen-containing calcining atmosphere, (e) obtaining at least one sample of the calcined VPO precursor during or after step (d), (f) heat treating the calcined VPO catalyst precursor in at least one temperature treatment step in an inert gas atmosphere containing steam at a higher temperature than in the calcining step (d), wherein the final VPO catalyst is obtained, (g) determining the content of crystalline vanadyl pyrophosphate of at least one sample obtained in step (e) via XRD, (h) modifying the process conditions of step (d) for one or more process parameters selected from the group consisting of calcination time, calcination temperature and composition of the calcination atmosphere based on the result of step (g), in order to ensure that the content of crystalline vanadyl pyrophosphate in the calcined VPO precursor prior to performing step (f) is at least 45% by weight. The VPO catalyst thus obtained is useful for the production of maleic anhydride from n-butane or benzene.

The present invention provides an analgesic pharmaceutical ingredient, which is a +4 or +5 valent vanadium compound, including inorganic vanadium compounds and organic vanadium compounds (including vanadium complexes or chelates). The present invention also provides the use of the above-mentioned compounds in the preparation of an analgesic pharmaceutical.

The present application relates to the field of refractory material, and particularly to a kind of anti-vanadium erosion refractory material, the chemical general formula of the refractory material is: (Mg a Ca b Sr c Ba 1‑a‑b‑c ) x (V d Nb e Ta f Mn 1‑d‑e‑f )2O x+5 , its crystal structure belongs to trigonal system;With adjustable component ratio, wherein 2≤x≤3, 0≤a≤0.1, 0.8≤b≤1, 0≤c≤0.1, 0.9≤d≤1, 0≤e≤0.05, 0≤f≤0.05.The present application can effectively improve the anti-vanadium erosion performance of the material by introducing vanadium-containing compounds into the refractory material, the component ratio of the refractory material and the replaceability of the precursor make it have better adaptability and flexibility to meet the requirements of different industrial equipment.

This invention relates to catalytic compositions and curable compositions containing said catalytic compositions. The catalytic compositions of this invention essentially consist of: (i) a metal compound; and (ii) a compound different from (i), said compound catalyzing an addition reaction between an alkene-bonded unsaturated compound and a thiol, wherein said catalytic composition is substantially free of vanadium compounds. The curable compositions according to this invention comprise: (a) a polyene, (b) a polythiol, and (c) a catalytic component, said catalytic component being composed of the aforementioned catalytic compositions.

A vanadium-chromium electrolyte, a method for preparing the same, and a redox flow battery composed thereof are provided. The vanadium-chromium electrolyte includes active substances and a free acid, the free acid acts as a proton conductive agent after ionization, and the active substances contain at least vanadium ions and chromium ions. The present disclosure further provides the method for preparing the vanadium-chromium electrolyte, which includes the following steps: dissolving a vanadium compound with a free acid, and obtaining a mixed solution of the free acid and vanadium ions through filtering; electrolytically reducing vanadium to an average valence state of 3.5 to 4 valence; adding a chromium compound, dissolving through stirring, and implementing a filtering; and adding pure water and an auxiliary reagent to adjust concentration, and preparing the vanadium-chromium electrolyte.

The application discloses a preparation method of high-crystallinity monodisperse M-phase vanadium dioxide nano powder, which comprises the following steps: dissolving a tetravalent vanadium compound in benzyl alcohol, and obtaining D-phase vanadium dioxide nano powder through a solvothermal reaction and a purification treatment; and annealing the D-phase vanadium dioxide powder to obtain the high-crystallinity monodisperse M-phase vanadium dioxide nano powder, wherein the annealing temperature is 250-600 DEG C, the annealing time is 30-480 min, and the oxygen concentration is 1-20 vol.%. The obtained powder has the characteristics of high crystallinity, high purity, good dispersity and small particle size, the phase transition enthalpy of the obtained M-phase vanadium dioxide nano powder reaches 45-50 J / g, the average particle size reaches 30-40 nm, the cost is low, the process is simple, the yield is close to 100%, and the powder is easy to be produced in an industrial scale.