962 results about "Phosphotungstic acid" patented technology

Devices such as flow through columns, substrates such as spherical polymer beads, and methods of using such to remove prions from any liquid sample are disclosed. A surface of a substrate is coated with a prion complexing agent, such as a salt of phosphotungstic acid. Blood or plasma passing through a column containing beads coated with prion complexing agent are rendered prion free.

Economical processes are disclosed for the production of components for refinery blending of transportation fuels by selective oxidation of feedstocks comprising a mixture of hydrocarbons, sulfur-containing and nitrogen-containing organic compounds. Oxidation feedstock is contacted with a soluble quaternary ammonium salt containing halogen, sulfate, or bisulfate anion, and an immiscible aqueous phase comprising a source of hydrogen peroxide, and at least one member of the group consisting of phosphomolybdic acid and phosphotungstic acid, in a liquid reaction mixture under conditions suitable for reaction of one or more of the sulfur-containing and/or nitrogen-containing organic compounds. Blending components containing less sulfur and/or less nitrogen than the oxidation feedstock are recovered from the reaction mixture. Advantageously, at least a portion of the immiscible acid-containing phase is recycled to the oxidation.

The invention relates to a method for reclaiming a carbon fiber reinforced epoxy resin composite material. The conventional method is high in equipment requirement and high in reclamation cost. The method comprises the following steps of: adding a catalyst into an organic reagent to prepare supercritical CO2 composite solution; putting the carbon fiber reinforced epoxy resin composite material tobe decomposed into a reaction kettle, and adding the supercritical CO2 composite solution; and reacting for 1 to 24 hours at the temperature of between 100 and 250 DEG C under the pressure of 7.5 to 25.0MPa, cooling the product to normal temperature, washing and drying the solid product in the product to obtain carbon fibers, and performing reduced pressure distillation on the liquid product in the product to obtain phenol and derivatives thereof. The catalyst is one or two of liquid super acid, solid super acid, phosphotungstic acid, phosphomolybdic acid, acetic acid, formic acid, hydrochloric acid, sulfuric acid and nitric acid. The method has the advantages of high degradation efficiency, environmental friendliness, low cost and the like, and is a green method for reclaiming the waste and old carbon fiber reinforced epoxy resin composite material.

The invention relates to a preparation method for 5-hydroxymethyl furfural, which belongs to production technology of chemicals, in particular to a method for synthesizing 5-hydroxymethyl furfural (HMF) from carbohydrates by adopting a catalytic way. The method for preparing the 5-hydroxymethyl furfural uses heteropolyacid or heteropolyacid salt as a catalyst, and the 5-hydroxymethyl furfural with high purity can be obtained at a high yield by modulating the catalyst activity, choosing proper solvents, adding additives, optimizing the reaction temperature and time and improving the post treatment technologies, and the corrosion to devices and the environmental pollution can be avoided when using liquid super acids. In the system of saturated sodium chloride solution-positive butanol, the yield of the HMF can reach 70 percent under the catalysis reaction of phosphotungstic acid for 4 minutes at 175 DEG C.

An electroless deposition solution of the invention for forming an alkali-metal-free coating on a substrate comprises a first-metal ion source for producing first-metal ions, a pH adjuster in the form of a hydroxide for adjusting the pH of the solution, a reducing agent, which reduces the first-metal ions into the first metal on the substrate, a complexing agent for keeping the first-metal ions in the solution, and a source of ions of a second element for generation of second-metal ions that improve the corrosion resistance of the aforementioned coating. The method of the invention consists of the following steps: preparing hydroxides of a metal such as Ni and Co by means of a complexing reaction, in which solutions of hydroxides of Ni and Co are obtained by displacing hydroxyl ions OH⁻ beyond the external boundary of ligands of mono- or polydental complexants; preparing a complex composition based on a tungsten oxide WO₃ or a phosphorous tungstic acid, such as H₃[P(W₃O₁₀)₄], as well as on the use of tungsten compounds for improving anti-corrosive properties of the deposited films; mixing the aforementioned solutions of salts of Co, Ni, or W and maintaining under a temperatures within the range of 20° C. to 100° C.; and carrying out deposition from the obtained mixed solution.

The invention discloses a preparation method of tert-butyl hydroperoxide and di-t-butyl peroxide which includes the following steps: after mixing vitriol, oxyful and phosphotungstic acid with certain concentration, adding tertiary butyl alcohol into a mixed liquor or adding the mixed liquor into the tertiary butyl alcohol; reacting for 0.5 to 5 hours under 20 to 60 DEG C; obtaining an oil phase after carrying out liquid separation on the crude product of the reaction; obtaining the tert-butyl hydroperoxide and di-t-butyl peroxide products by carrying out decompressing and rectifying on the oil phase; the method has the advantages of simple and convenient operation, low manufacture cost, safety, high efficiency and high yield; in addition, the method of the invention can adjust the relative content of the two reaction products by changing the reaction conditions. The reaction products of tert-butyl hydroperoxide and di-t-butyl peroxide are separated by decompressing and rectifying, thus avoiding the working procedures of acid cleaning and caustic wash in the traditional technique, solving the defect of overlarge waste water amount in the traditional technique, being beneficial to protecting the environment, reducing the manufacture cost and being capable of greatly increasing the enterprise benefits.

The invention provides a method for comprehensively recovering tungsten and fluorine from minerals, namely a mixed acid of phosphoric acid and sulfuric acid is adopted for decomposing complex calcium-containing minerals containing fluorite, scheelite, apatite, and calcite, wherein the fluorite is decomposed to fluorine hydride or silicon tetrafluoride to escape, and absorption treatment is performed for preparing hydrofluoric acid or a fluoride salt; and the scheelite is transformed to phosphotungstic acid to enter into a solution, and filtrate after filtration is supplemented into the consumed sulfuric acid and the phosphoric acid after extraction of the tungsten and returned to the new-round mineral leaching. The method disclosed by the invention has the advantages of comprehensively recovering the fluorine and the tungsten from the minerals, reducing the requirements on the fluorite or the tungsten ore raw material, reducing the pressure on a mineral dressing link, improving the comprehensive recovery rate and simultaneously ensuring the decomposition rate of the fluorite and the scheelite, wherein the decomposition rate of the fluorite is above 98%, and WO3 contained in decomposition slag is reduced to below 0.5%; furthermore, a leaching agent can be recycled, so that leaching cost and wastewater emission are greatly reduced; and the method also has the advantages of simple leaching equipment, convenience in operation and easiness in realization of industrialization.

The invention discloses a method for preparing phosphotungstic heteropoly acid with a Keggin structure. The method comprises the following steps of: (1) contacting a tungstate solution and an inorganic acid solution; (2) transferring the solution to a high-pressure reaction kettle, and activating at high temperature under high pressure to obtain an active intermediate; (3) contacting the obtained substance and phosphoric acid to obtain a phosphotungstic acid solution; and (4) adding an inorganic salt precipitator into the phosphotungstic acid solution, precipitating phosphotungstic acid by salting-out and crystallization, filtering, purifying and drying to obtain the Keggin phosphotungstic heteropoly acid. By the method, a process flow is simple, the yield of the heteropoly acid is high, and the preparation cost is reduced obviously; high-concentration strong acid in the conventional method is not used in the preparation process, so that the corrosivity to equipment is reduced greatly; and an inflammable low-boiling point organic extractant is not used, and the safety of preparation is improved greatly.

The invention provides a synthesis and purification method of medium chain triglycerides by using solidified phosphotungstic acid as catalyst, medium carbon chain C6-C12 fatty acid and glycerol as raw material for etherification reaction to synthesize the medium carbon chain glyceride, and a three stage molecule distillation purification is employed to obtain the high purity medium carbon chain triglycerides product.

The present invention relates to a composite catalyst for preparing sec-butyl acetate by direct esterification of ethyl ester and butylene, which takes heteropoly acid as the catalyst active component and porous carrier as the dispersant; the weight proportion of the heteropoly acid and the porous carrier is 0.01:1 to 10:1. The heteropoly acid is one with Keggin structure, which consists of phosphotungstic acid, silicotungstic acid, germanium tungstic acid, arsenowolframic acid, phosphomolybdate, germanomolybdate or arsenicomolybdate. The porous carrier comprises porous SiO2, Al2O3, SBA-15, MCM-41, white carbon black, porous SiC, corallite, andalusite, cordierite, meerschaum, Attapulgite or kaolin. The composite catalyst of the present invention solves the problem that the catalysis efficiency is low if the heteropoly acid is separated out from the reaction system.

The invention relates to a method for electrocatalytic reduction of CO2 using multi-metal oxygen cluster ionic liquid as electrocatalyst. The method is characterized in that positive ions of the multi-metal oxygen cluster ionic liquid are imidazoles [Cnmim]+(n=2, 4, 6, 8), pyridines [Cnpyr]+(n=2, 4) and quaternary ammonium salts [N4444]+, and negative ions of the multi-metal oxygen cluster ionic liquid are phosphotungstic acid negative ions (PW12O403-) and phosphomolybdic acid negative ions (PMo12O403-); and the electrocatalytic reduction reaction is a three-electrode system, wherein a glassy carbon electrode is a working electrode, a platinum sheet electrode is a counter electrode, and a saturated calomel electrode is a reference electrode. The method is simple in process and convenient in operation, performs the electrocatalytic reduction for the CO2 to form such fuels as methane and carbon monoxide, realizes the resource utilization of the CO2, reduces the atmospheric pollution, and has important significance on the environmental protection.

The invention provides a method for preparing adipic acid through liquid-phase catalytic oxidation of cyclohexanol. H2O2 is taken as oxidant, a heteropoly acid imidazole salt is taken as catalyst, the cyclohexanol undergoes the catalytic oxidation to prepare the adipic acid, the catalyst can be phosphotungstic acid 1-butyl-3-methylimidazolium bmim3PW12O40, phosphomolybdic acid 1-butyl-3-methylimidazolium bmim3PMo12O40, and molybdovanadophosphoric heteropolyacid 1-butyl-3-methylimidazolium bmim3+xPMo12-xVxO40 (x is equal to between 1 and 3) and so on, and the bmim represents a 1-butyl-3-methyl-imidazolium cation. Compared with the method of preparing the adipic acid by industrially using nitric acid (nitrate) to oxidize the cyclohexanol, the method can not produce poisonous oxynitride N2O, and avoids the harm to the environment; and in a reaction system, phase shift catalyst and addition agent are not used, which avoids the potential environmental pollution and has apparent economic and social significance.

The invention provides a preparation method and applications of a multi-level pore structure metal organic framework material. The preparation method comprises: mixing a metal salt, an organic ligand, N,N-dimethylformamide, water and carboxylic acid, uniformly stirring, carrying out a hydrothermal reaction, cooling to a room temperature after completing the hydrothermal reaction, carrying out centrifugation, and purifying to prepare the multi-level pore structure metal organic framework material. According to the present invention, the prepared multi-level pore structure metal organic framework material has characteristics of stable performance and controlled and uniform pore size; and phosphotungstic acid is loaded in the mesoporous channel of the metal organic framework material through an in-situ synthesis method, the original framework structure can be remained after the loading, and the presence of the mesopores allows the contact between the large substrate molecule and the active site so as to extend the application range of the multi-level pore structure metal organic framework material.

The ester hydrolyzing method includes hydrolyzing ester in water to produce C1-C10 fatty acid or aromatic acid and C1-C4 fatty alcohol under the presence of ammonium salt of heteropoly acid as catalyst. The ammonium salt of heteropoly acid is obtained through the reaction between heteropoly acid in Keggin structure and inorganic ammonium salt or organic amine, the heteropoly acid is selected from phosphotungstic acid, silicotungstic acid, silicomolybdic acid and phosphomolybdic acid; the inorganic ammonium salt is selected from ammonium carbonate, ammonium nitrate, ammonium sulfate, ammonium phosphate and diammonium hydrochloride; and the organic amine is selected from fatty amine, alicyclic amine and arylamine. The said ester hydrolyzing method can obtain high conversion rate in relatively lower water/ester ratio and relatively short time, and the catalyst is cheap and easy to separate from the product.

The invention relates to a method for removing the sulfur in gasoline and diesel oil through photocatalytic oxidation; a catalyst is dissolved into an accessory ingredient and then is added into an oil product; under the irradiation of light, the sulfur-compounds in the oil product are selectively oxidized by molecular oxygen and generated into sulfur dioxide which escapes from a reaction liquid; the accessory ingredient is methanol, ethanol or acetonitrile; the catalyst is phosphotungstic acid, phosphotungstate, phosphomolybdate, phosphomolybdate or any mixture thereof or a derivative thereof; the light refers to artificial light or sunshine which can inspire the catalyst or a complex compound thereof; the molecular oxygen refers to the molecular oxygen or pure compressed oxygen in the air; the dosage of the catalyst is 0.01 to 5g for each L of fuel; the dosage of the accessory ingredient is 1 to 500g for each L of fuel; the pressure of the oxygen is 0.02 to 1.0 MPa; the method is carried out under normal temperature and pressure and does not need the treatment of extraction and concentration; the sulfur is separated in the mode of SO2 without products of organic sulfur like sulfone, sulphoxide, thioether, and the like, thereby having no loss of organic carbon; the yield of the oil product can achieve more than 99 percent.

The invention discloses polyacrylate elastomer with a core-shell structure and its preparation method. The polyacrylate elastomer with the core-shell structure is obtained by using acrylic acid ester, metacrylic acid ester and a reactive type ultraviolet ray absorber according to a certain ratio through a method of the polymerization of seed emulsion in a semicontinuous feeding mode, wherein the color of the appearance is white, light yellow or yellow, and the weight average molecular weight is 2 to 10xe<5>g/mol. Polymer latex particles appear as a microsphere state before the demulsificationof the elastomer, a three-layer structure of the latex particles microsphere can be observed after dyeing by phosphor-tungstic acid, the three layers comprise a core layer, a transition layer and a shell layer sequentially from the inside to the outside. According to the invention, polyacrylate elastomer with the core-shell structure reacts the polymer material by a melt blending process so that the ultraviolet light stability of the high-molecular material can be enhanced and the polymer material can be effectively is toughened, and the emulsion polymerisation method has the advantages of environmental protection without pollution, mature technology and easy realization of industrialization.

The invention provides a supported phosphotungstic acid catalyst which comprises a spherical mesoporous silica carrier and phosphotungstic acid supported on the spherical mesoporous silica carrier; on a basis of total weight of the catalyst, the catalyst comprises 10-50 wt% of the phosphotungstic acid, and 50-90 wt% of the spherical mesoporous silica carrier. The invention also provides a preparation method of the supported phosphotungstic acid catalyst. In addition, the invention also provides a preparation method of methyl acetate by using the supported phosphotungstic acid catalyst. The supported phosphotungstic acid catalyst of the invention can be recovered for recycle; when compared with a homogeneous catalyst-concentrated sulfuric acid, the supported phosphotungstic acid catalyst has better catalytic performance, and cause no corrosion to equipment.

The invention discloses a preparation method of an attapulgite-based solid acid catalyst for vegetable fat epoxidation. The preparation method comprises the steps of synthesizing phosphotungstic acid peroxide serving as a catalyst for fat epoxidation; then performing purification, acid modification and organic modification on attapulgite; and finally, loading the phosphotungstic acid peroxide on the organically modified attapulgite serving as a carrier to obtain the load type solid acid catalyst. According to the preparation method, the performance of the phosphotungstic acid peroxide is improved, the repeated use of the phosphotungstic acid peroxide is realized, the application range of the attapulgite is expanded, and the additional value of the attapulgite is increased; the attapulgite-based solid acid catalyst has the characteristics of easiness in separation of the catalyst from products, zero pollution, no corrosion to equipment, simplicity in post-treatment of the products, reutilization, simple regeneration process and the like.

The invention discloses a C7-C10 n-alkane isomerization catalyst which comprises a composite carrier and 0.05-3.0% of platinum by mass based on carrier, wherein the composite carrier comprises 20-70% of MCM-41 molecular sieve by mass, 10-35% of phosphotungstic acid by mass and 10-50% of aluminum oxide by mass. The catalyst is used for the isomerization reaction of the C7-C10 n-alkane, and has relatively high isomerization activity, high product liquid yield and relatively high selectivity of highly branched alkane.