The method of preparation of zeolite-containing catalyst for conversion of hydrocarbons
(57) Abstract:The method of preparation of the zeolite catalyst provides an operation step of annealing granules and processing at a temperature of 450-550oC for 5-10 h of a gas mixture containing, wt.%: carbon monoxide 4-8, 4-12 carbon dioxide, hydrogen 10-20, oxygen 2-6, water vapor 5-15, the rest is nitrogen. The invention relates to the synthesis of catalysts for the conversion of light hydrocarbons to aromatic hydrocarbons and may find wide application in the processing of associated petroleum gas, wide fraction of light hydrocarbons and compressit obtaining aromatic hydrocarbons and motor fuels.Known methods of preparing catalysts for the conversion of light hydrocarbons to aromatic hydrocarbons using zeolite powder 
Closest to the technical nature of the method, selected as a prototype is a method for preparing zeolite-containing catalyst described in 
Prototype method includes mixing a powder of zeolite ZSM-5 in the ammonium form with 0.5 N solution of ZnCl2and 0.5 N solution of NH4Cl, filtering the solution, rinsing in water for UD is named Al2O3, drying at 100-120oC for 10 h and calcination at 540oC. the resulting product has a residue content of Zn 1% by weight. As of promoting additives in the synthesis of catalyst added salts of various metals, for example, Ge, Cu. The number of promoters does not usually exceed 1%
The disadvantage of the prototype method is a relatively short period of stable activity prepared in this way catalyst due to the formation thereon during operation of the coke deposits.In the present invention has the aim of increasing the time a stable activity of the catalyst. This problem is solved in the method of preparation ceritadewasa catalyst for conversion of hydrocarbons into aromatic hydrocarbons comprising a mixture of a powder of zeolite ZSM-5 in the ammonium form with Zn salt solution and the salt solution NH4Cl, filtering the mixture, washing the precipitate in water to remove anions, evaporation, formation of granules with linking Al2O3the drying and annealing step, in which the granules after subjected to annealing treatment at 450-550oC for 5-10 h of a gas mixture containing, by weight. the oxide of plerixafor in the gas mixture the proposed composition significantly reduces the side coking process using a catalyst in the reaction of aromatization of light hydrocarbons. As a result of this additional operations increases the period of stable activity of the catalyst.Experimental studies of samples of the catalyst obtained with the use of additional processing in the gas mixture of the above-mentioned composition and mode of thermal treatment, has shown that going beyond the stated ranges leads to decrease the time of its stable activity. When exceeding the lower limits of the ranges is reduced due to a decrease in the efficiency of the flow of topochemical reactions leading to the formation of active centers with a long period of steady activity. If the upper limit of the temperature and concentration ranges begin to dominate the processes of destruction of active sites and structure of the catalyst in thermal processing.Example 1. In a vessel with a stirrer to prepare 11 l of a solution of ammonium sulfate in the condensate with a concentration of 30 g/l in an amount to provide 5 EQ (NH4)2SO41 equiv of Na2O in the zeolite. In the prepared solution with stirring download 1245 g high zeolite in sodium form, the resulting suspension is heated to 50-60
Then carry out the treatment of the catalyst with a gas mixture containing, by weight. carbon monoxide 5; carbon dioxide 6; water vapor 15; 15 hydrogen; oxygen 5; nitrogen rest at a temperature of 500oC for 6 hPrepared by the proposed method, the catalyst was pilot-tested at the facility for processing of light hydrocarbons into aromatic hydrocarbons.When tested in the reactor conversion was loaded with 50 g of catalyst a density of 0.7 g/cm3. The raw material used light hydrocarbons WITH2-C5. The process was carried out at a temperature of 500oC, flow rate 1.5 h-1for liquid raw materials. Under these conditions, the yield of aromatic hydrocarbons (C6-C9) was 58.2% aliphatic hydrocarbons 7.2% of gases 33,0% including hydrogen 2.5% methane by 4.0% TO 7.2% WITH3+C419%coke 1,6%
The catalyst prepared by the proposed method, maintains stable activity in the reaction of transformation of broad fraction of light hydrocarbons for 170 h, and in making gasoline for 400 including the parameters of the control catalyst, prepared according to revovles the yield of aromatic hydrocarbons. The criterion for stability was 20% drop in output.Example 2. The catalyst was prepared in accordance with example 1 except that the processing of the catalyst used, the gas mixture composition, wt. carbon monoxide 6, carbon dioxide 7, water vapor 12, 10 hydrogen, oxygen and 5 nitrogen else. A period of steady activity in the transformation of broad fraction of light hydrocarbons is 180 h, and straight-run gasoline 420 hExample 3. The catalyst was prepared in accordance with example 1 except that used to process the gas mixture composition, wt. carbon monoxide 8, carbon dioxide 10, water vapor 11, oxygen and 5 nitrogen else. A period of steady activity in the process of transformation of broad fraction of light hydrocarbons was 160 h, and for gasoline 380 hPrepared by the proposed method, the catalyst can be widely used in catalytic obtaining aromatic hydrocarbons from waste oil. The method of preparation of the zeolite catalyst for conversion of hydrocarbons into aromatic hydrocarbons comprising a mixture of a powder of zeolite ZSM-5 in the ammonium form with a salt solution Nie, the formation of granules with a binder, aluminum oxide, drying and calcination, wherein the granules after stepwise annealing processed at 450 550oC for 5-10 h of a gas mixture containing, by weight.Carbon monoxide 4 8
Carbon dioxide 4 12
Hydrogen 10 20
Oxygen 2 6
Water vapor 5 15
Nitrogen The Otherc Documents
SUBSTANCE: invention relates to a homogeneous catalyst based on tetra-4-(4'-carboxyphenylsulphanium)-5-cobalt nitrophtalocyanine(II) of tetrasodium salt of formula .
EFFECT: invention allows to produce a compound having a high catalytic activity in the oxidation of sodium diethyldithiocarbamate.
4 dwg, 1 tbl, 2 ex
SUBSTANCE: nanotubular materials crystallising in the system of K2O-TiO2-X-H2O (X=NiO, MgO, Al2O3, Cr2O3, CO2O3, Fe2O3) are characterized by the fact that in their composition up to 10% of ions Ti4+ is replaced by doping two- or trivalent metal. The method of synthesis of nanotubular materials is characterized by the fact that the synthesis of the samples is carried out by hydrothermal treatment of a pre-prepared mixture of hydroxide in KOH solution, to produce the initial mixtures of hydroxides, a solution of titanyl chloride synthesised by reaction of TiCl4 with chilled distilled water, is mixed with aqueous solutions of salts of finished elements in a predetermined ratio, and then the precipitation of hydroxides is produced by adding NH4OH to the aqueous solution mixture at pH=9-9.5 followed by washing with distilled water, drying at 70-90°C and mechanical crushing, then the crushed precipitate is mixed with 10 M KOH solution and subjected to a hydrothermal treatment at 170-180°C for, at least, 24 hours, after which the resulting product is washed with distilled water.
EFFECT: invention makes it possible to synthesise potassium-titanate nanotubes with an average outer diameter of 5 to 12 nm.
2 cl, 5 dwg, 2 ex
SUBSTANCE: method of growing diamond single-crystals doped with nitrogen and phosphorus at high pressures of 5.5-6.0 GPa and temperatures of 1600-1750°C is carried out on the seed crystal, which is pre-pressed into a substrate of cesium chloride and separated from the source of carbon, nitrogen, and phosphorus with the metal-solvent, which is used as an alloy of iron, aluminium, and carbon. Between the source of carbon, nitrogen, and phosphorus and the seed crystal, a temperature difference of 20-50°C is created. The alloy of iron, aluminium, and carbon in the metal-solvent is taken with the following component ratio, wt %: iron 92.5-95.0; aluminium 2.5-0.5; carbon 5.0-4.0. The mixture of the source of carbon, nitrogen, and phosphorus is taken with the following component ratio, wt %: carbon (graphite) 95.0-97.0; phosphorus 5.0-3.0; adsorbed nitrogen 0.001±0.0005. Heating is carried out up to the initial temperature in a zone of growth at 100-250°C higher the melting temperature of the alloy of the metal-solvent, the exposure is produced at this temperature for 50 to 150 h. The mass flow rate of crystal growth is more than 2 mg/h. The technical result consists in the controlled doping the diamond single- crystal grown on the seed with impurities of phosphorus and nitrogen in the conditions of influence of high pressure and temperature.
EFFECT: resulting large diamond single-crystals contain a nitrogen admixture in the concentration of 0,1-17,8 parts per million of carbon atoms and phosphorus in a concentration of 0,5-5 parts per million of carbon atoms.
2 dwg, 3 ex
SUBSTANCE: urea-containing solution (13) is produced in the section (10) of synthesis, the solution is purified in the section (14) of extraction, and an aqueous solution (15) containing mostly urea and water, which is produced from the above-mentioned section of the extraction is subjected to the concentration process. Herewith the concentration process includes a separation step through an elective membrane.
EFFECT: improvement of the current urea production process.
9 cl, 1 dwg
FIELD: petrochemical processes.
SUBSTANCE: high-octane fuels and propane-butane fraction are obtained via conversion of hydrocarbon feedstock on contact with hot catalyst placed in reactor, into which diluting gas is supplied at elevated pressure. Catalyst is Pentasil-type zeolite with general formula xM2/nO,xAl2O3,ySiO2,zMe2/mO wherein M represents hydrogen and/or metal cation, Me group II or VII metal, n is M cation valence, m is Me metal valence, x, y, z are numbers of moles of Al2O3, SiO2, and Me2/mO, respectively, and y/x and y/z ratios lie within a range of 5 to 1000. Metal oxide Me2/mO is formed during calcination, in presence of oxygen, of Me-containing insoluble compound obtained in zeolite reaction mixture.
EFFECT: increased octane number of gasoline fractions with propane-butane fraction as chief component of gas products, and prolonged inter-regeneration time of catalyst.
11 cl, 4 dwg, 3 tbl, 16 ex
FIELD: petrochemical processes.
SUBSTANCE: alkylation is carried out at 250-425°C, pressure 0.1 to 2.5 MPa, benzene/ethylene molar ratio 1-5, and volume flow rate of raw material 0.5 to 3.5 h-1 in presence of spherical zeolite-containing catalyst having following composition: 5-55 wt % high-silica ZSM-5-type zeolite with silica/alumina molar ratio 20-150 and 45-95 wt % amorphous aluminosilicate carrier. Chemical analysis of catalyst, wt %: aluminum oxide 3.0-9.5, rare-earth element oxides 0.4-5, calcium oxide 1.0-5.0, sodium oxide 0.1-0.6, silicon oxide - the balance.
EFFECT: increased yield of ethylbenzene and alkylation selectivity.
2 cl, 1 tbl, 5 ex