Inorganic chemistry (C01)

C   Chemistry; metallurgy(313007)
C01            Inorganic chemistry(20496)
ethod for producing cathode material based on system li2fesio4 // 2615697
FIELD: chemistry.SUBSTANCE: as initial component, Aerosil (SiO2) nanoscale powder with a surface area of 350-380 m2/g is selected and dried in vacuo for 1-3 hours. Iron oxide and lithium oxide films with a thickness of 1-3 nm are coated on aerosil powder by means of the MLT method to achieve the stoichiometric composition Li2FeSiO4 and the diffusion mixing of the resulting composition Li2FeSiO4 is carried out at 300°C to 500°C for 8-15 hours.EFFECT: invention allows to obtain a cathode material having a high specific surface area and high specific capacity, with the uniform distribution of the chemical composition in the total powder volume and the defect-free crystal structure.1 tbl
ethod of producing materials with anti-bacterial properties based on cotton fabric modified by nanoparticles of zinc oxide // 2615693
FIELD: biotechnology.SUBSTANCE: using the method of producing a material with anti-bacterial properties the cotton fabric is modified by nanoparticles of zinc oxide in the amount of 0.1-1.0 mg/cm2 or -0.8-8% of weight. The modification is carried out by repeated wetting of the surface stretched to needle holders of cotton fabric dispersing zinc oxide nanoparticles in water or ethanol with a concentration of 0.1-0.6 g/l obtained by laser ablation. Wetting is followed by drying at a temperature of up to 100°C. The size of zinc oxide nanoparticles in a dispersion of 5-100 nm with an average value of 10-20 nm.EFFECT: simple and inexpensive method of producing a material with anti-bacterial properties and with the specified content of zinc oxide particles on the surface.6 ex

ethod for producing composite powder mb2-sic, where m = zr, hf // 2615692
FIELD: chemistry.SUBSTANCE: invention relates to the production of powder materials composition MB2-SiC, wherein M = Zr, Hf, containing nanocrystalline silicon carbide. The resulting composite powders are ZrB2-SiC and/or HfB2-SiC can be used to apply protective coatings on carbon-containing antioxidant materials, including reinforced carbon and silicon carbide fibers, graphite materials, and for the manufacture of ultra-ceramic materials used primarily to create aerospace and missile technology, heating systems, thermal power, nuclear energy technologies, chemical and petrochemical industries. Composite powder is obtained, having increased oxidative stability, which is a composition of zirconium diboride and / or hafnium diboride 10÷65 vol. % nanocrystalline silicon carbide, which is prepared phenol-formaldehyde resin solution with a mass of carbon content of from 5 to 40% in an organic solvent in which are dispersed powder of zirconium diboride and/or hafnium diboride, whereupon the resulting slurry is tetraethoxysilane at a concentration of⋅ 1⋅10-3 to 2 mol/l, providing a stoichiometric synthesis of silicon carbide, and the acid catalyst tetraethoxysilane hydrolysis, further hydrolysis is carried out with stirring at a temperature of 0÷95°C tetraethoxysilane hydrolyzing solutions to form a gel, followed by drying the resulting gel, then drying the resulting gel at a temperature of 02÷50°C and a pressure of 1⋅10-4÷1 atm until the mass change ceases, the resulting xerogel is subjected to a two-stage heat treatment under reduced pressure, in a first stage at a temperature of 400 to 1000°C for 0.5÷12 hours, in a second stage at a temperature of 1100 Up to 1450°C for 0.5÷12 hours. Get composite powders MB2-SiC, wherein M = Zr, Hf, containing nanocrystalline silicon carbide.EFFECT: absence of foreign phases and increased oxidative stability in air flow as compared with the powders of individual HfB2 and ZrB2.5 cl, 4 dwg, 4 ex
Synthesis of zsm-5 crystals with improved morphology // 2615689
FIELD: physics.SUBSTANCE: synthesis is carried out from the reaction mixtures suitable for the crystal synthesis of ZSM-12 framing structure in the absence of the seed crystals of ZSM-5 framing structure, including the absence of any seed crystals. In case of the synthesis mixtures with the sufficiently high ratio of XO2:Y2O3, the introduction of ZSM-5 seed crystals into the synthesis mixture can lead to the pure phase of ZSM-5 crystals with the new morphology. This morphology may include spiky primary crystallites of approximately 0.5 microns or less, which are ordered/aggregated into larger secondary crystalline structures.EFFECT: primary crystallites aggregating into the secondary crystalline structure provides a large surface area of ZSM-5 crystals mesopores.17 cl, 12 dwg, 14 tbl, 12 ex
ethod of producing stable aqueous colloidal solutions of cerium dioxide nanoparticels // 2615688
FIELD: chemistry.SUBSTANCE: ammoniumhexanitrocerate (IV) aqueous solution is prepared to produce stable aqueous cooloidal solutions of cerium dioxide nanoparticles, by intimately stirring it until complete dissolution. Hydrothermal treatment of the solution is carried out at a temperature of 80-200°C during 0.4-50 hours. The precipitate of cerium dioxide nanoparticles is separated by centrifugation from the mother liquor containing NH4NO3 and HNO3. Nanoparticles of CeO2 are redispersed in distilled water. The resulting colloidal solution is added to the aqueous solution of stabiliser. Nontoxic organic hydroxyl compounds selected from the series: dextran, maltodextrin, ammonium citrate are used as the stabiliser. The molar ratio of CeO2: stabiliser equals 1:(2-5). If dextran and maltodextrin are used as the stabilisers, calculation is made per monomer material amount.EFFECT: invention enables to obtain aqueous colloidal solutions, stable in a wide pH range.4 cl, 2 dwg, 4 ex
ethod for barium carbonate and iron oxide mixture grinding for barium hexaferrites production // 2615562
FIELD: chemistry.SUBSTANCE: wet grinding of a stoichiometric mixture of barium carbonate and iron oxide is carried out in an acidic medium containing polyacrylic acid and isopropanol at the following ratio, wt %: polyacrylic acid 0.2-0.6, isopropyl alcohol 4-10, water 28-45, stoichiometric mixture of barium carbonate and iron oxide - the rest.EFFECT: increased coercive force of barium hexaferrite magnetization, and increased activity during raw ferrite components mixture, resulting in substantial firing temperature reduction.3 ex, 1 tbl

ethod for concentrating and separating metal chlorides in/from iron(iii) chloride-containing hydrochloric acid solution // 2615527
FIELD: chemistry.SUBSTANCE: invention can be used in chemical industry. For concentration and separation of metal chlorides into/from iron (III) chloride-containing hydrochloric acid solution, iron (III) chloride is converted by hydrolysis in haematite and is precipitated from said solution. Haematite is filtered in a filtering device to produce a filtrate of hydrochloric acid. Concentrated non-hydrolysable metal chlorides are precipitated from iron-containing filtrate of hydrochloric acid by increasing concentration of free hydrogen chloride in solution.EFFECT: invention enables to reduce concentration of hydrochloric acid and power consumption during process, increases degree of recovery of hydrogen chloride.9 cl, 4 dwg, 6 tbl, 8 ex

ethod for producing highly dispersed aluminium-zirconium oxide system // 2615513
FIELD: chemistry.SUBSTANCE: method involves anodic dissolving the metallic aluminium in the sodium chloride solution with the concentrationof 29±0.5 g/l in a coaxial electrolytic cell with electrode areas differing on two or more orders with the anodic current density of 20-160 A/m2 in the presence of zirconium ions in an amount providing the zirconium oxide content in the formed precipitate from 5 to 20 wt %, maintaining the resulting precipitate in the mother liquor for at least 48 hours, filtering and drying the sediment.EFFECT: method allows to obtain highly dispersed aluminium-zirconium oxide systems with an average particle size of 20-50 nm, which can be used for producing ceramics of special purpose.2 cl, 1 dwg, 1 ex, 1 tbl
ethod for granulation of zeolite as synthetic detergent component // 2615506
FIELD: chemistry.SUBSTANCE: zeolite granulating method is described, including zeolite powder is moistening with granulation liquid, an aqueous solution of SokalanCP5 acrylic maleic acid copolymer®, manufactured by BASF, Germany, with a molecular weight of at least 70,000 g/mol is taken as the granulation liquid component, the humidified mixture is stirred until a homogeneous plastic mass is obtained, granules are formed and dried; according to the invention, 33.3-50.0% aqueous solution of acrylic maleic acid copolymer is taken as the granulation liquid, during preparation, the mass ratio of solid zeolite phase and granulation liquid is 5:1, zeolite granulation is performed using a sieve with mesh size of 200 microns, after drying and granulating, zeolite is passed through the sieve with mesh size of 200 microns.EFFECT: obtaining of granular zeolite with good performance, the preparation of granules with sufficient mechanical strength that do not disintegrate during transportation and have good solubility with the ability to form a stable zeolite suspension with uniform zeolite distribution over the entire solution volume, reduced residual moisture content of zeolite after granules formation.2 cl, 2 tbl, 9 ex

esoporous titanium dioxide nanoparticles and methods for their prepairing // 2615402
FIELD: chemistry.SUBSTANCE: titanium oxide is in the form of the uniform spherical particles with the size of 20 nm to 100 nm. Each particle contains mesopores with the uniform distribution of their sizes centered at the value of 2 nm to 12 nm. For particles of TiO2, an aqueous solution of a titanium compound is prepared at the concentration of 0.5 to 1.5 moles per liter in the presence of the alpha hydroxy carboxylic acid in a molar ratio of the acid to titanium of 0.02 to 0.2; the solution is heated to 70-80°C followed by the addition of the anatase seeds TiO2, and this temperature is maintained of 1-3 hours; then it is heated for 4.2 hours to the reflux temperature in the range of 100°C; the solution is cooled to the room temperature, and the reaction product is separated.EFFECT: improved quality of titanium oxide due to the homogeneity of the particles and the narrow distribution of the pore size.8 cl, 6 dwg

ethod of producing carbon nanotubes in supersonic flow and apparatus for implementing thereof // 2614966
FIELD: chemistry.SUBSTANCE: mixture is prepared in a 8 mixer-gas generator by feeding carbon and/or carbon-containing compounds therein from the 15 block, catalyst powder from the 16 block, inert gas from the 6 system through the 7 flow-meter and hydrogen preheated in the 17 apparatus from the 18 source. Connection of the mentioned elements is carried out using 14 software-switching apparatus (SSA). The obtained mixture is fed to the 2 heating system comprising a 1 discharge chamber which is placed inside a 3 radiotransparent tube positioned in the 4 inductor formed in the shape of a spiral, connected to a 5 high-frequency generator. 14 SSA comprises 19 impulse laser which 20 beam, focused on the surface of the 21 metal bar, initiates discharge in the obtained mixture. Induction heating products are directied into the 9 collecting tank through a nozzle cluster containing 13 Laval nozzle with 1.5÷5 Mach numbers. 10 particulate trap cooled by 11 system is positioned in the 9 storage container, which is tightly connected to the 2 heating system and to the 12 inert gas venting system.EFFECT: increased content of carbon nanotubes in the obtained soot.2 cl, 1 dwg

ethod of producing semi-active technical carbon // 2614964
FIELD: chemistry.SUBSTANCE: invention relates to production of semi-active technical carbon from liquid hydrocarbon material. Method involves pre-heating liquid hydrocarbon material and process air, mixing latter with natural gas and combustion of produced mixture to produce streams of combustion products, axial supply therein of a stream of sprayed liquid hydrocarbon material, containing steam, narrowing formed stream of sprayed hydrocarbon raw material and combustion products, its thermal oxidative decomposition. Before feeding into streams of combustion products hydrocarbon material is sprayed with steam.EFFECT: invention improves quality of semi-active technical carbon and reduces power consumption.1 cl, 1 dwg, 1 tbl
ethod for apatite ore and concentrate processing // 2614962
FIELD: chemistry.SUBSTANCE: method comprises apatite acidolysis using nitric acid followed by freezing out and separation of calcium nitrate tetrahydrate crystals, precipitation and separation from nitrophosphate fluoride solution, neutralisation of the purified solution, precipitation of phosphate concentrate of rare earth elements (REE) and radionuclides by cooling down the solution to minus 20°C, the precipitated calcium nitrate tetrahydrate crystals are separated from the mother solution at minus 20°C, the nitrophosphate solution is neutralised by calcium carbonate or calcium hydroxide solution at pH 2.5; precipitate from the solution of rare earth phosphates and radionuclides is separated, extraction of REE and radionuclides is carried out in a cascade of centrifugal extractors using an organic extraction solvent (tributyl phosphate) at a concentration of 30 to 100%. The extraction solution may be presaturated with nitric acid of the same concentration as the process solution.EFFECT: high extraction rate of REE and radionuclides from apatite ore and concentrate with low residual activity, using a simplified process, reduced energy consumption and labour intensity.3 cl

Plant for producing synthetic liquid fuel // 2614956
FIELD: chemistry.SUBSTANCE: plant for producing synthetic liquid fuel can be used, in particular, for performing the chemical process of producing synthetic liquid fuel. The plant for producing synthetic liquid fuel, which comprises a unit for the raw material gas adsorptive purification from the sulfur compounds, a unit for converting methane into synthesis gas, a unit for the synthesis gas purification from CO2, a liquid hydrocarbons synthesis unit, a synthetic liquid hydrocarbons (SLH) stabilization unit, a SLH hydro-treating unit, a SLH hydroskimming unit, a synthetic liquid fuels (GTL) fractionation unit, a water recycling unit and a hydrogen circulation unit. The units are interlinked functionally.EFFECT: simplification of the technological process of producing synthetic liquid fuels due to the organization of self-providing the individual process stages with hydrogen-containing gas, excluding the stage of target synthesis products extraction from exhaust gases, and due to performing the hydro-treating and hydroskimming of the synthetic liquid hydrocarbons without prior fractionation.1 dwg

ethod for producing nanohydroxyapatite // 2614772
FIELD: chemistry.SUBSTANCE: method for producing nanohydroxyapatite comprises mixing in the reactor the four-watered calcium nitrate solution of Ca(NO3)2⋅4H2O with the concentration of 0.01-0.15 mol/l with the aqueous solution of orthophosphoric acid H3PO4 with the concentration of 1.4-1.5 mol/l at a molar ratio of Ca/P=5/3, thermostating the resulting solutions mixture under constant stirring with a stirrer rotating at the speed of 170-200 rev/min, until reaching the temperature equilibrium with the external thermostatic jacket heated to the temperature of 33-37°C, adding sodium hydroxide solution NaOH with a concentration of 1 mol/l, heated to 37-42°C, until reaching the acidity index of pH=7, maintaining the molar ratio of Ca/Na=1.25-1.30. Moreover, 2/3 of the sodium hydroxide solution is added directly to the reactor center at a flow rate of 7-10 m/s, the remaining amount - with portions of 50 ml, and then the resulting sol is maintained at a temperature of 37°C and the stirrer switched off for one hour, removed from the reactor, centrifuged and washed three times with bidistilled water.EFFECT: simplifying the production and reducing the production time.2 cl, 4 dwg, 1 tbl, 2 ex
ethod for producing ammonium silicon fluoride // 2614770
FIELD: chemistry.SUBSTANCE: method for producing ammonium silicon fluoride from the fluorosilicic acid solution containing silicon dioxide, includes the separation of the initial solution into two parts, the direction of the first part containing the calculated amount of acid for decomposition by means of ammonia water at the pH of 8-9 and the temperature of 50-90°C with separating the silicon dioxide precipitate formed from the solution and feeding a filtrate representing the ammonium fluoride solution, into the remaining part of the fluorosilicic acid solution. The resulting solution is neutralized with ammonia water solution, and the neutralized ammonium silicon fluoride solution is dehydrated in a fluidized bed of an inert material at the temperature of 120-180°C. The fluorosilicic acid amount directed to decomposition by means of ammonia water is calculated based on the acid concentration and the silicon dioxide content in the initial solution as per the proposed mathematical relationship.EFFECT: improving the quality of the desired product.1 tbl
ethod for zinc dimethacrylate preparation // 2614766
FIELD: chemistry.SUBSTANCE: invention relates to methacrylic acid zinc salt - Zn dimethacrylate, which can be used as an activator in sulfur vulcanization systems with an accelerator for rubber compounds preparation, as well as biocides, intended for combating pathogenic microorganisms, for creation of differentvarious products with biocidal properties. The method comprises aqueous sodium hydroxide addition to methacrylic acid and water under cooling, at a molar ratio of 1:1, followed by vigorous stirring at a temperature not higher than 50°C, addition of zinc chloride aqueous solution to the resulting sodium salt of methacrylic acid by equal portions at a molar ratio of 2:1, at a temperature not higher than 40°C, formed product isolation by filtration, washing with water, squeezing and drying at a temperature of 100-110°C.EFFECT: simplified method due to hardware design simplicity, no need to apply high temperature and catalysts.2 ex

Carbonizer // 2614717
FIELD: chemistry.SUBSTANCE: invention relates to hydrochemical production equipment and can be used in the production of alumina from nephelines or low-grade bauxites using a sintering technique. Carbonizer comprises a cylindrical housing (1) with a conical bottom (2) and a cover (3), tubes (5) for feeding gas into the carbonizer and an exhaust pipe (10) for removing the exhaust gas from it, air lift (4) for agitating aluminum hydroxide suspension produced during decomposition of solutions. Pipes (5) for feeding gas into the carbonizer are positioned vertically within the housing (1), wherein their lower parts are fixed coaxially in cylinder courses (6) rigidly connected to each other and to the walls of the housing (1).EFFECT: invention reduces power consumption.3 cl, 2 dwg

ethod for producing uranium oxide and silicon tetrafluoride from uranium tetrafluoride // 2614712
FIELD: physics.SUBSTANCE: method comprises mixing in the stoichiometric ratio of uranium tetrafluoride and silica previously subjected to the mechanical activation in the presence of 0.5-1.5 wt % of inorganic alkali element compound, granulating the homogenized blend, drying the granules at the temperature of 100 to 250°C and subsequent heating the granules at the temperature not higher than 600°C for 0.5 to 1 hour. Lithium fluoride, or potassium, or rubidium, or cesium, or chloride, or nitrate, or carbonate, or sulfate, or hydroxide, or phosphate of lithium, sodium, potassium, rubidium or cesium are used as an inorganic compound of the alkali element. To produce U3O8, heating is performed in the dry air environment, to produce UO2 - in an environment of the drained inert gases.EFFECT: reducing power consumption and high product yield, including high-purity silicon tetrafluoride.4 dwg, 1 tbl, 15 ex

Carbon monoxide conversion device // 2614669
FIELD: chemistry.SUBSTANCE: carbon monoxide conversion device comprises a cooler-separator 1, equipped with an exhaust line of water condensate 12, a few cooling reactors 2, 3, 4 of carbon monoxide catalytic conversion, saturators 5 and 6 are located between the reactors on supply lines of partially converted gas, connected to the exhaust line of water condensate 12, to the supply line of the mixture of synthesis gas part 13 and water condensate part 14. The device is also equipped with supply lines of synthesis gas 7 and exhaust lines of hydrogen-containing gas 8.EFFECT: invention enables to produce hydrogen-containing high pressure gas due to the carrying out of conversion process at low temperature and high pressure.1 dwg

Hydrogen plant // 2614668
FIELD: machine engineering.SUBSTANCE: plant includes located in the feed line and desulfurization unit converter with a burner, sequentially connected by a line feed synthesis gas with steam recovery boiler and converter of carbon monoxide, which are equipped with steam supply lines in the feed line. The latter is connected to a line of supply of hydrogen gas from the cooler drier associated feed line condensate water treatment unit which is also connected to a water supply line with the steam recovery boiler and converter carbon monoxide and hydrogen separation unit, equipped with a feed line of purge gas to the burner connected with a line feed. Thus on a feed line cooler synthesis gas feed line is located and connected to the synthesis gas prior to the waste heat boiler.EFFECT: increase the yield of hydrogen.3 cl, 1 dwg
ethod for liquid-phase synthesis of multi-component ceramic material in zro2-y2o3-gd2o3-mgo system for production of electrolyte for solid oxide fuel cell // 2614322
FIELD: chemistry.SUBSTANCE: invention may be used for production of electrolyte for solid oxide fuel cell. Liquid-phase synthesis of multi-component ceramic material in ZrO2-Y2O3-Gd2O3-MgO system is carried out by selecting salts ZrO(NO3)2⋅2H2O, Y(NO3)3⋅5H2O, Gd(NO3)3⋅6H2O and Mg(NO3)2⋅6H2O as initial reagents. Above salts are used to prepare diluted solutions. Reverse precipitation of hydroxides from respective salts is carried out using aqueous ammonia solution NH4OH till complete precipitation of all hydroxides and occurrence of the precipitate. Gel-like precipitate is filtered and frozen at -25°C for 24 hours. Synthesized powder of solid solution (ZrO2)0.92(Y2O3)0.03(Gd2O3)0.03(MgO)0.02 is subject to thermal treatment at 800°C. Then compacts are formed by the method of uniaxial pressing under pressure of 150 MPa. Above compacts are burned at a temperature of 1400°C in the tube heater with isothermal holding for 2 h and heating rate of 350-400°C/h.EFFECT: invention allows to lower precipitate agglomeration degree, increase its dispersivity and homogeneity and also hydroxide precipitation completeness.4 dwg, 2 tbl
ethod for producing graphene film on substrate // 2614289
FIELD: chemistry.SUBSTANCE: substrate - a X-cut-off of piezoelectric crystal, e.g., La3Ga5.5Ta0.5O14, with planes (110) parallel to the crystal surface is placed into a quartz reactor. The reactor is pumped out to 10-3-10-8 Torr and heated up to 900-1450°C. The reactor then filled with carbon gases, e.g. acetylene, methane or ethylene, to achieve pressure of 10-10-1 Torr. After 15-100 min. the reactor is pumped out again to achieve pressure of 3·10-6 Torr while cooling it down to the room temperature.EFFECT: process simplification, temperature reduction, production of uniform high-quality graphene films.5 cl, 2 dwg, 3 ex
ethod for strontium carbonate and iron oxide mixture grindind for strontium hexaferrite production // 2614171
FIELD: chemistry.SUBSTANCE: wet grinding of the stoichiometric mixture of strontium carbonate and iron oxide is carried out in an acidic medium containing calcium silicate, polyacrylic acid and isopropanol in the following ratio, wt %: 0.2-0.6 of polyacrylic acid, 4.0-10.0 of isopropyl alcohol, 0.3-1.2 of calcium silicate, 28-45 of water, stoichiometric mixture of strontium carbonate and iron oxide - the rest.EFFECT: increased coercive force of strontium hexaferrite magnetization, and increased activity during raw ferrite components mixture in strontium hexaferrite production.1 tbl, 3 ex

Pyrolysis reactor for producing synthesis gas // 2614168
FIELD: chemistry.SUBSTANCE: internal reactor cavity is charged with raw material with the fraction of up to 50 mm: biofuel, solid household or agricultural waste, coal slurry - by means of the charging unit 3. The reactor comprises a screw compactor 4 and the scraper 5 for removing slag. An odd number of magnetrons 2 creating the temperature of 1000-1500°C by means of microwave radiation is mounted on the reactor housing 1 in the same horizontal plane at the equal distance from each other. Synthesis gas and slags resulting from the raw material pyrolysis are removed from the reactor through the unloading port 9, separated and purified from admixtures. The housing 1 is made three-layered: the inner layer 6 made of ceramic tiles, the intermediate layer 8 is heat-insulating, the outer layer 7 is of stainless steel with the openings for the free passage of microwave radiation from the magnetrons 2.EFFECT: expanding the functional capabilities of the reactor.8 cl, 2 dwg
ethod of producing nanoporous material for sensitive elements of gas sensors and nanoporous material obtained using said method // 2614146
FIELD: chemistry.SUBSTANCE: invention relates to production of nanoporous materials based on silicon-aluminium aerogels and can be in making sensitive elements of measurement devices of gas sensors, used in power engineering, chemical industry, as well as analysis of expired air in medicine. Disclosed is a method of producing nanoporous material, which is a composite silicon-aluminium aerogel composition SiO2/Al2O3, using a sol-gel process, in which to produce aluminium oxide sol a product of reacting aluminium nanopowder and/or aluminium nitride composition with particle size from 50 to 500 nm with water is used, which is then peptized to obtain sol. Also disclosed is a corresponding nanoporous material.EFFECT: technical result is obtaining nanoporous material based on silicon-aluminium aerogel with required charge properties: zeta-potential from -20 to -26 mV, charge surface density from 10-3 to 10-2 C/m2, in pores of which it is possible to perform transformation (change) of spectra of molecules of gases, as well as producing an aerogel without use of supercritical drying during its synthesis. 9 cl, 4 dwg, 1 tbl, 5 ex
ethod for boron nitride nanotubes production // 2614012
FIELD: chemistry.SUBSTANCE: method comprises preparation of a reaction mixture of a boron oxide compound and a catalyst, reaction mixture heat treatment in ammonia at a temperature of 950°C-1200°C for 1 hour, nanotubes selection from the reaction products, washing and drying, at that, the reaction mixture consists of a boron oxide compound and a catalyst taken in a proportion providing cation ratio in the range of B/Me=7.1, where Me=Li, Mg , Ca, Sr, lithium, magnesium, calcium, or strontium hydroxide or carbonate, are used a catalyst, and boric acid or ammonium borate is used as a boron oxide compound, the reaction mixture is applied as a 0.1 to 1 mm thick layer to a closed strip of mild steel or a thin mesh which is passed through the furnace with ammonia atmosphere.EFFECT: invention allows to obtain discrete cylindrical boron nitride nanotubes, 10-100 nm in diameter and 0,5-50 microns long, using cheap and low toxic reagents in a continuous manner.1 tbl, 1 ex
ethod for producing nanoporous boron nitride // 2614007
FIELD: chemistry.SUBSTANCE: reaction mixture is prepared of boric acid and magnesium nitrate, taken in an amount providing the cation ratio B/Mg in the range of 5-20, by means of dissolving in distilled water, and then the reaction mixture is heat-treated in ammonia at the temperature from 800°C to 1200°C. The invention allows to obtain boron nitride with a high specific surface (up to 1600 m2/g) and the pore size in the range from 2 to 100 nm.EFFECT: improving the desired product properties.4 cl, 1 tbl, 8 ex
ethod for barium carbonate and iron oxide mixture grinding for barium hexaferrites production // 2614005
FIELD: chemistry.SUBSTANCE: wet grinding of a stoichiometric mixture of barium carbonate and iron oxide is carried out in an acidic medium containing polyacrylic acid and isopropanol at the following ratio, wt %: 0.2-1.8 of citric acid, 2-8 of isopropyl alcohol, 28-32 of water, stoichiometric mixture of barium carbonate and iron oxide - the rest. As a result, the synthesis activity of the original ferrite components significantly increases, thereby reducing the of barium hexaferrite synthesis temperature and products sintering temperature.EFFECT: increased coercive force in terms of barium hexaferrite magnetization.1 tbl, 3 ex
ethod for producing coatings from boron nitride nanosheets // 2613996
FIELD: chemistry.SUBSTANCE: invention relates to the field of producing coatings containing ceramic two-dimensional structures, namely the hexagonal boron nitride nanosheets having a thickness of 1-10 nm and the characteristic linear dimension from 100 nm to 5 microns, which can be used as a carrier of catalysts, as well as for imparting hydrophobic properties to a surface. The essence of the invention consists in that the reaction mixture is prepared, consisting of boric acid and a catalyst represented by sodium, or potassium, or magnesium, or strontium nitrate taken in amounts providing the B/Me cations ratio in the range of 0.5-5, where Me=Na, or K, or Mg, or Sr; the reaction mixture is applied to the surface in the form of a layer with the thickness from 0.1 to 0.5 mm , and heat treatment in the ammonia atmosphere is performed at a temperature ranging from 900°C to 1100°C.EFFECT: obtaining uniform coatings of hexagonal boron nitride nanosheets on inner surfaces and on the surfaces of the articles of complex shape.4 cl, 1 tbl, 2 ex

ethod for producing alloyed yttrium aluminium garnet // 2613994
FIELD: chemistry.SUBSTANCE: method is performed by dispersing the solid aluminium yttrium oxide derivative in nitrate aqueous solutions of alloying elements salts, and the subsequent treatment with the final product extraction. Wherein the initial yttrium aluminium derivative is represented by the product previously obtained by co-precipitation of aluminium and yttrium from the nitrate aqueous solutions. The resulting precipitation product is afterwards subjected to filtration and washing with deionized water. Thereafter, the extracted product is dispersed by the ultrasonic influence in the solution of the alloying elements selected from the group of alkali and alkaline earth metals and the elements of the 3d group, the resulting pulp is dried with constant stirring, the dried product is ground and calcined at 1200°C to 1600°C.EFFECT: invention allows to obtain yttrium aluminium garnet with the uniform distribution of alloying elements.3 cl, 4 dwg, 3 tbl, 4 ex

ethod of producing alumina from chromiferous bauxites // 2613983
FIELD: chemistry.SUBSTANCE: method of producing alumina from chromiferous bauxites comprises wet batch sintering, leaching of sintered material with flush water to produce aluminate solutions, whereof aluminum hydroxide is extracted. Bauxite is subjected to wet grinding on the concentrated reusable soda solution at a volume ratio of W:T=3:1 separate from the limestone. A pulp with a particle size of less than 0.05 mm is obtained. The pulp is subjected to magnetic separation to obtain magnetic and non-magnetic products. The magnetic product with chromium oxide (III) content from 25 to 30% is taken for processing to sodium chromate. The non-magnetic product with limestone fines and fresh soda is taken for the batch adjustment. Thereafter, the batch is sintered. The resulting sintered material is leached with flush water to produce aluminate solutions, whereof aluminium hydroxide is extracted. Aluminium hydroxide is filtered, washed and taken for calcination.EFFECT: invention allows to increase the complexity of processing low-quality bauxite to produce alumina and sodium chromate, reduce the environmental pressure due to the extraction of the chromium compounds.6 dwg, 3 ex

etal phosphates and method of producing them // 2613979
FIELD: chemistry.SUBSTANCE: invention relates to monophosphates or mixed metallic phosphate of type (M1, M2, M3, …Mx)3(PO4)2⋅aH2O, where 0≤a≤9, and process to obtain them. In this case (M1, M2, M3, …Mx) are metal monophosphates metal or several metals in the mixed metallic phosphates and metals are selected from Mn, Fe, Co, Ni, Sc, Ti, V, Cr, Cu, Zn, Be, Mg, Ca, Sr, Ba, Al, Zr, Hf, Re, Ru, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu provided that at least one metal in phosphate is selected from Mn , Fe, Co and Ni, wherein the phosphate comprises no more than 10 different metals M1, M2, M3, …Mx.EFFECT: invention is used to prepare the lithiated (containing Li) cathode material for Li-ion batteries and phosphates with high purity.17 cl, 8 dwg, 1 tbl, 20 ex
Processed silicon oxides and metal silicates for improved cleaning in dental care means // 2613924
FIELD: medicine, pharmacy.SUBSTANCE: group of inventions refers to materials based on treated silicon dioxide, as well as to methods for manufacture of such materials. The method for material preparation based on thermally treated silicon dioxide comprises thermal treatment of the material based on precipitated metal-containing silicon dioxide wherein the metal has a Mohs hardness value of at least 5.5 in the form of oxide. The metal material comprises aluminum or tin. Thermal processing involves heating of material based on precipitated silicon dioxide at a temperature of 400°C during about 8 hours. The resulting material is characterized by loss on ignition of less than 3% by weight at 900°C. Einlehner attrition value is 90 - 450% greater than the Einlehner attrition value for material based on precipitated silicon dioxide.EFFECT: invention provides an effective means for teeth cleaning.24 cl, 4 tbl, 2 ex
ethod of producing composite based on microporous zeolite and mezoporous silicon oxide // 2613516
FIELD: chemistry.SUBSTANCE: first mixture consisting of tetraethylorthosilicate, water, tetrapropylammonium hydroxide and aluminum isopropoxide is prepared. The second mixture consisting of water, cetyltrimethylammonium bromide and sodium hydroxide is prepared. The first mixture is exposed to microwave radiation at a temperature of 100-115°C. The second mixture is added to the resulting product in a mass ratio of product:second mixture equaling 1:1.5-1.7. The resulting suspension is crystallized under the impact of microwave radiation at a temperature of 180-190°C. The resulting precipitate is separated by centrifuging, washed, dried and calcined to obtain the desired product.EFFECT: obtaining the desired product with mesopores of larger size than in the desired product produced using the known method, while reducing the time of crystallization.3 dwg, 1 ex

ethod for producing platinum complexes (iv) with aminonitroxyle radicals // 2613513
FIELD: chemistry.SUBSTANCE: invention relates to producing platinum complexes (IV) with amino-nitroxyle radicals, the resulting products and use thereof. Claimed a method for producing platinum complexes (IV) with amino-nitroxyle radicals of a general formula 1 , where A1 - a heterocyclic piperidine nitroxyle radical with amino group, A2 - NH3, X - haloid ligands or X+X - dicarboxylate ligands, Y - hydroxy- or acyloxy-ligands -OCOR, enabling interactions between platinum complexes (II) M[Pt(NH3)Cl3], where M - alkaline cation, and 4-amino-2,2,6,6-tetramethylpiperidine resulting in intermediate mixed ligand complexes of platinum (II) followed by their oxidizing and acylation into complexes of platinum (IV), wherein substituted amine is a sterically hindered heterocyclic amine 4-amino-2,2,6,6-tetramethylpiperidine; organic peracids are used for oxidation in a polar organic solvent, acylation is a catalyst-free reaction or 4-dimethylaminopyridine is used as catalyst, followed by recovery of the target product.EFFECT: cost-effective and efficient method for producing platinum complexes (IV) with amino-nitroxyle radicals.3 dwg, 3 ex
ethod for producing titanium dioxide // 2613509
FIELD: chemistry.SUBSTANCE: method for producing titanium dioxide comprises heating titanyl sulfate and ammonium while gradually raising the temperature and heat treatment at 600-700°C with forming the gaseous phase containing a sulphate and an ammonium compounds and the solid phase in the form of anatase titanium dioxide, to provide the sulfate compound content in the anatase titanium dioxide based on the sulfur trioxide SO3 in an amount of 1.5-3.0 wt % with respect to TiO2. The obtained anatase titanium dioxide is subjected to mechanical activation in a ball grinder with the drum rotation speed of 600-750 rev/min, at the ratio of the balls weight to the anatase weight of 1:10-18 within 0.5-1.5 hours. The activated product is afterwards calcined at a temperature of 800-900°C, with obtaining rutile titanium dioxide.EFFECT: obtaining nanosize titanium dioxide with the stable rutile structure and reduced content of volatile compounds.3 cl, 4 ex

ethod for lithium chloride regeneration in chemical industry // 2613438
FIELD: chemistry.SUBSTANCE: method for lithium chloride regeneration in chemical industry comprises plasticization and precipitation bath solution neutralisation with an aqueous solution of lithium hydroxide. Multicomponent starting mixtures contain 0 to 60% of dimethylacetamide (DMAA), 0 to 70% isobutyl alcohol (IBA), lithium chloride, hydrogen chloride, water and impurities - balance to 100%. These mixtures were separated to lithium chloride containing ones and not containing ones. The mixtures which do not contain lithium chloride are separated to mixtures containing DMAA and mixtures not containing DMAA. The liquid stream consisting of IBA and water is removed from the system. At that, the plasticization bath solution is rectified in two columns and the distillation residue mixture of the second column and the precipitation bath is evaporated by vacuum. Vacuum rectification of vacuum evaporator distillation residue, vacuum rectification of vacuum evaporator and the third column stripping product is performed to obtain dimethylacetamide (DMAA). The concentrated lithium chloride solution is crystallized in dimethylacetamide. The flow of concentrated lithium chloride is sequentially fed to vacuum rectification, crystallization and centrifugation. Lithium chloride complex salt - dimethylacetamide - is separated from the stock solution. Purified lithium chloride is obtained from the stock solution by repeated dilution with water and vacuum evaporation.EFFECT: invention allows to obtain lithium chloride with a purity up to 95 percent and a high yield.1 dwg

ethod for copper (ii) and manganese (ii) determination by indicating tube in case of their joint presence in solutions for natural waters analysis // 2613407
FIELD: chemistry.SUBSTANCE: invention can be used for semiquantitative manganese (II) and copper (II) determination in aqueous solutions, in particular in natural and waste waters under field conditions. The method comprises filling of a glass tube with an inner diameter of 0.5 cm with Na- form of macroreticular carbonaceous resin "КБ-2Э-16" based on polymethacrylate diethylene glycol divinyl ether, followed by filling with the sample solution. At that, at the first stage, copper (II) is determined visually along the length of the coloured resin area at a pH of about 4.5 and ionic strength of 0.1 (NaNO3) of the analyzed solution. At the second stage, after solution passage, manganese (II) is determined along the length of the coloured resin area which appears with the addition of formaldoxime complexing agent and NaOH to the indicator tube to create pH ~10.EFFECT: method reduces complexity, reduces the amount of reagents and time of analysis for copper and manganese determination in an aqueous solution under field and laboratory conditions.2 dwg, 1 ex

ethod of purifying contaminated raw material for separating production // 2613157
FIELD: treatment plants.SUBSTANCE: invention relates to methods of purifying raw material contaminated with harmful isotopes for further usage in production of reduced uranium for nuclear fuel. Method of purifying contaminated raw material for separating production from harmful isotopes consists in reducing concentration of isotopes 232U, 234U, 236U by processing uranium hexafluoride of contaminated raw material in double cascade of gas centrifuges. Uranium hexafluoride of contaminated raw material is processed in double cascade of gas centrifuges intended for producing low-enriched hexafluoride 235U from pure uranium hexafluoride supplied for the main feed of the first cascade, contaminated raw material is supplied for additional feed of the first cascade. Purified raw material is taken from the first or second cascade.EFFECT: invention enables to obtain high-quality raw material with allowable content of limiting harmful isotopes.6 cl, 5 dwg, 8 tbl, 4 ex
Inorganic single-crystal scintillator // 2613057
FIELD: chemistry.SUBSTANCE: invention relates to novel crystalline inorganic scintillation materials based on lanthanum bromide alloyed with cerium, and can be used for registration of ionizing radiation - gamma rays, X-rays, cosmic rays, elementary particles in fundamental physics, engineering and medicine. The inorganic single-crystal scintillator has the composition of La(1-m)CemBr(3-2k)Ok, where m is the mole fraction of cerium replacing La, more than 0, but less than or equal to 1; k - the mole fraction of oxygen replacing bromine, within the range from 1.5⋅10-4 to 8⋅10-4.EFFECT: increased mechanical strength of the crystal scintillator, in particular with a diameter of 15 mm and more, while preserving the high scintillation performances.1 tbl, 8 ex
White pigment // 2613055
FIELD: chemistry.SUBSTANCE: invention relates to chemical industry and can be used for making pigments for varnishes and paints. Pigment consists of shell and core. Shell is made of titanium dioxide. Core is made of a mixture of kaolin and aluminium hydroxide with total weight content of aluminium silicates aluminium hydroxide not less than 98 %. Weight ratio of aluminium hydroxide to weight of core varies from 10 to 25 pts.wt. Weight ratio of shell material to core material is 0.66–2.33 at fractional composition of core material from 2 to 5 mcm and shell material from 0.2 to 0.5 mcm.EFFECT: invention improves quality of pigment, increases resistance to destruction in operating conditions at acidic precipitation, storage and transportation.1 cl, 8 ex
White pigment // 2613052
FIELD: chemistry.SUBSTANCE: invention relates to chemical industry and can be used for making pigments for varnishes and paints. Pigment contains shell and core. Shell is made of titanium dioxide. Core is made from kaolin with weight content of aluminium silicates of not less than 97 %. Weight ratio of shell material to core material is 0.66–4.0, fractional composition of core material from 2 to 5 mcm, and shell material from 0.2 to 0.5 mcm.EFFECT: invention improves quality of pigment, increases resistance to destruction in operating conditions, storage and transportation.1 cl, 9 ex
ethod for producing high purity natural graphite // 2612713
FIELD: chemistry.SUBSTANCE: invention relates to carbon material thermo-chemical purification technology. The claimed method for natural graphite purification comprises heating it in Acheson graphitisation furnace to a temperature of 2000-2700°C by passing an electric current through a graphite core, followed by its treatment with a halogen-containing compound. Graphite blocks with the same cross section as the furnace core are placed in the furnace; the blocks are separated from one another by partitions. The partition thickness is 0.25-0.35 of the block length. The partitions are made of structural or electrode type graphite, porosity 20-27%. The invention provides reduction of furnace total resistance.EFFECT: method for producing high purity natural graphite, improved core heating process, exact core position in the furnace both before and after heating.
Organotemplate-free synthetic process for production of a zeolitic material of cha-type structure // 2612697
FIELD: chemistry.SUBSTANCE: invention relates to synthesis of zeolites. Disclosed is a method for synthesis of a zeolite having a CHA-type framework structure containing YO2, X2O3 and optionally containing Z2O5. Method involves following steps: (1) preparing a mixture containing one or more sources of YO2, one or more sources of X2O3 and seed crystals, having a CHA-type framework structure, where CHA frame structure of seed crystals contains YO2, X2O3 and optionally contains Z2O5; (2) crystallisation of mixture obtained at step (1); where Y denotes a tetravalent element, X denotes a trivalent element and Z denotes a pentavalent element. Method comprises optionally adding one or more sources Z2O5 at step (1), and if CHA framework structure of seed crystals does not contain Z2O5, seed crystals have molar ratio YO2:X2O3, equal to or greater than 5.EFFECT: method enables to obtain CHA type zeolite with high molar ratio YO2:X2O3 without using an organic template.41 cl, 15 dwg, 7 ex

ethod for purifying ammonia, mixtures of nitrogen and hydrogen or nitrogen, hydrogen and ammonia // 2612686
FIELD: chemistry.SUBSTANCE: invention relates to the chemical industry and can be used for purification of gases obtained during direct synthesis of ammonia from hydrogen and nitrogen. The obtained ammonia or gas mixture is sequentially passed under pressure of 0.1-25 MPa through column 3 filled with aluminium oxide with a specific surface area of 50-150 m2/g, through column 4 filled with CaO, NaOH, KOH, or molten NaOH / KOH, or their mixture , at a temperature of 20-70°C and further at 170-425°C through column 5 filled with activated carbon having a specific surface area of 100÷3000 m2/g. The surface of the activated carbon in column 5 is applied with nitrates (V) or nitrates (III) of sodium, potassium, cesium, magnesium, calcium, strontium or barium or thier mixture, pre-activated with an inert gas or hydrogen or their mixture at a pressure of 0.1 -25 MPa and a temperature of 250-700°C. The gas flow rate is 100-1000 m3/h. To clean ammonia it is preliminary removed from methane by passing over the liquid ammonia in intermediate container 1. The adsorbent is regenerated by passing with an inert gas, hydrogen or their mixtures in column 3 at 200-700°C, and in column 5 - at 250-700°C.EFFECT: increased productivity of the process for obtaining high-purity ammonia, which contains impurities of less than 1 ppm.7 cl, 2 dwg, 3 ex
Device for production of water with reduced heavy molecules content // 2612667
FIELD: chemistry.SUBSTANCE: device comprises a distillation column operating under vacuum, an evaporator, a condenser and a heat pump. At that, the distillation column consiss of two coaxial pipes with diameters D1 and D2, with D1>D2 and (D1-D2)/2<300 mm, with a bulk packing layer located in the gap between them. The liquid distributor on the column top has at least 800 irrigation points per one square metre of the column orifice sectional area.EFFECT: increased productivity and reduced energy costs.5 cl, 5 dwg, 4 tbl, 3 ex
Gas synthesis generator // 2612632
FIELD: machine engineering.SUBSTANCE: gas synthesis generator comprises a cylindrical housing 1, inside which an annular gap with the combustion chamber 2 is installed. Mentioned combustion chamber 2 is formed as a cylinder with the output end of the plugged material permeable to the mixture of hydrocarbon fuel with an oxidant. Inside the combustion chamber the heat exchanger 4 is arranged, which consists of an outer 5 and inner tube 6 of different diameter, one set to another. The end of the outer tube 5 is plugged. The cavity 6 of the inner pipe communicates with the annular gap 11 between the outer 5 and inner tube 6. The annular cavity 13 of the combustion chamber 2 formed by its wall and the outer tube 5 of the recuperator 4, is connected with annular cavity 14 of the collector 3 synthesis gas, placed on the recuperator 4. In the inlet part of the inner tube 6 of the heat exchanger 4, the nozzle 8 is mounted. The annular cavity 10 between the wall of the housing 1 and the wall of the combustion chamber 2 is connected to the annular cavity 11 between the inner 6 and outer 5 tubes of the recuperator 4. The annular cavity between the outer wall 4 and the wall of the combustion chamber 2, the heat exchanger outlet portion ignitor 9 is deduced.EFFECT: invention allows to increase productivity, reduce the size and weight of the generator of synthesis gas by the heat recovery of conversion products.2 cl, 2 dwg

ethod of obtaining sulphur from exhaust metallurgical gases // 2612481
FIELD: metallurgy.SUBSTANCE: in order to obtain sulfur from exhaust metallurgical gases containing sulfur oxide (IV) SO2 and oxygen O2, SO2 is reduced by gas containing carbon monoxide CO and hydrogen H2, in a hollow reactor at a temperature of 1100-1350°C. Next, the resulting reduced gas is processed in a catalytic reactor with an aluminium oxide catalyst. An additional amount of gas comprising carbon monoxide and hydrogen is fed into the hollow reactor, to obtain a gas containing hydrogen sulfide H2S, carbonyl sulphide COS, CO, water, H2 and unreacted SO2. The resulting gas is fed into thesulfur condenser to condense it, and then tosulfur production unit by Claus method. Above mentioned temperature is maintained in the hollow reactor by changing the flow of the gas comprising carbon monoxide and hydrogen. Before feeding the mentioned reduced gas to the catalytic reactor, it is cooled in a waste-heat boiler to a temperature of 350-450°C. The catalytic reduction of SO2 by gas containing carbon monoxide and hydrogen is carried out at a space velocity of 250-500 hr-1 and at a temperature in a catalyst layer of 400-500°C.EFFECT: invention ensures higher grade of sulfur extraction from gases and simplifies the process.18 cl, 1 dwg,1 tbl, 1 ex

ethod for producing culinary salt // 2612405
FIELD: food industry.SUBSTANCE: method for producing culinary salt of brine from rock salt dissolution is described, including the evaporation of said brine in the presence of seeding, with obtaining the evaporated suspension, the classification of the evaporated suspension, washing the salt pulp from gypsum seeding, separating the thickened suspension in the filtering centrifuge, drying the salt, in which the evaporation is carried out at 50-155 °C, and in evaporator buildings calcium sulfate hemihydrate is used as a seeding, for preparing which a part of gypsum slurry, before feeding it to seeding, is heated to a temperature equal to the temperature of the medium in the housing for which the seeding is designed, and then fed to the evaporator housing; the salt pulp is flushed from the gypsum seeding by the initial brine in the slurry of salt crystals, and the salt crystals are additionally washed with the initial brine in a filtering centrifuge.EFFECT: expanding the brine evaporation temperature range, elongating the inter-washing plant run, reducing the gypsum particles admixture content in the resulting salt.1 dwg