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Method of initiating highly selective catalyst for obtaining ethylene oxide Invention relates to a method of initiating the process of ethylene epoxidation. The method includes the initiation of an epoxidation reaction by the interaction of a gaseous composition of initial materials in the presence of an epoxidation catalyst at the first temperature, equal to approximately 180-210°C. The first temperature is increased to the second temperature of approximately 230-290°C for a period of time of approximately 6-50 h with the simultaneous introduction of a sufficient concentration of a moderating material, so that the amount of the moderating material, adsorbed on the catalyst after achievement of the second temperature, constitutes approximately from 10 to 50 g/m3 of the catalyst. The second temperature is kept for a period of time of approximately 50-350 h with bringing the gaseous composition of initial materials to a content of approximately 0.5-25% of CO2. The second temperature is reduced to the third temperature with the simultaneous increase of a concentration of the moderating material to the level higher than the sufficient concentration. |
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Mullite-containing support for ethylene oxide synthesis catalysts Invention relates to catalyst supports and catalysis. Described is a support for an ethylene epoxidation catalyst which contains aluminium oxide coupled with a stability enhancing amount of mullite, said stability enhancing amount of mullite being about 7-20% mullite. Described is an ethylene epoxidation catalyst which contains said support and use thereof in a method of converting ethylene to ethylene oxide in vapour phase in the presence of oxygen. |
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Geometrically classified solid carrier for olefin epoxidation catalyst, which has definite form Invention relates to carriers for catalytic systems and their application. Carrier for catalytic system, which contains at least one catalytically active metal, placed on it, which includes having definite geometric form refractory solid carrier from aluminium oxide (Al2O3), in which width of at least one wall of said having definite geometric form refractory solid carrier from aluminium oxide (Al2O3) constitutes less than 2.5 mm. Catalyst, which includes said carrier and its application at olefin epoxidation are described. |
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Method of initiating highly selective catalyst for producing ethylene oxide Method involves: contacting a catalyst bed including a silver-based highly selective epoxidation catalyst with a feed gas composition at a first temperature of about 180-220°C, said feed gas composition containing ethylene, oxygen, a chloride-containing moderator and carbon dioxide, said carbon dioxide being present in said feed gas composition in a first concentration greater than about 6 vol. %; raising the first temperature to a second temperature of about 230-270°C to obtain the desired concentration of ethylene oxide; adjusting the feed gas composition in order to maintain said desired concentration of ethylene oxide while achieving the desired efficiency and selectivity of the catalyst. The invention also relates to a method for epoxidation of ethylene. |
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Reactor system, absorbent and method of conducting reaction in fed material Invention relates to reactor system, absorbent, and method of conducting reaction in fed material. Reactor system comprises cleaning zone containing absorbent and reaction zone comprising catalyst and located downstream of cleaning zone. Proposed method of conducting reaction in fed material containing hydrocarbon comprises the steps whereat material components are brought in contact with absorbent to reduce amount of impurities in said material and in contact with catalyst to make reaction products. Absorbent for removal of said impurities contains silver, alkaline or alkali-earth metal in amount of 50 mmol/kg and substrate layer from aluminium oxide with surface area of 75 m2/g. |
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Producing ethylene oxide using fixed concentration of retardant Invention relates to versions of a method for controlled oxidation of ethylene to form ethylene oxide, wherein ethylene and oxygen are used along with a silver-based catalyst, a retardant and a co-retardant. When controlling oxidation of ethylene, in order to optimise catalyst properties such as activity and/or selectivity, concentration of the retardant is kept constant within a relatively narrow operating concentration range, and concentration of the co-retardant is varied within a relatively wide operating concentration range. Concentration of the retardant is reduced during the service life of the catalyst. |
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Methods of producing ethylene oxide and ethylene glycol According to the invention, a base is further added to one or more positions downstream the heat-removal section of an ethylene oxide absorber to main pH in the range of 5.5-9.5, in at least one region, where glycolic esters are hydrolysed to an organic acid and ethylene glycol. |
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Method of hydroxidation using catalyst produced from gold cluster complex Invention relates to olefin hydroxidation catalysts. Proposed catalytic composition for production of olefin oxide by olefin hydroxidation comprises gold nanoparticles deposited on particles of nanoporous titanosilicate carrier. Note here that said catalyst is obtained by method including deposition of cluster complex gold-ligand on nanoporous titanosilicate carrier at minus 100°C to 300°C to produce catalyst precursor, and heating at not over 50-800°C and/or chemical treatment of catalyst precursor for 15 min to 5 h to form catalyst. Invention covers also the method of producing olefin oxide comprising bringing olefin with, at least, three carbon atoms in contact with oxygen in the presence of hydrogen and catalyst with above described composition. Note here that said contact is realized at 160°C and lower that 300°C and pressure varying from atmospheric pressure to 3549 kPa (500 psi). It covers also catalyst precursor composition including cluster complex ligand-gold deposited on particles of nanoporous titanosilicate carrier. |
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Calcination in inert gas in presence of low-concentration oxidising component Invention relates to an improved method of producing silver catalysts used in gas phase synthesis of ethylene oxide from ethylene and oxygen. Described is a method of producing a catalyst, involving saturation of an inert substrate with a solution which contains a catalytically effective amount of a compound which contains silver, a promoting amount of a compound which contains a transition metal, calcination of the saturated substrate by heating at temperature ranging from approximately 200°C to approximately 600°C for a period of time sufficient for reducing the silver compound to metallic silver, and for decomposition and removal of almost all organic substances; heating is carried out in an atmosphere which includes a combination of an inert gas and from approximately 10 parts per million to approximately 500 parts per million of a gas which contains an oxygen-containing oxidising component. The invention describes a catalyst produced using said method, and a method of oxidising ethylene to ethylene oxide using molecular oxygen in gaseous phase in the presence of the obtained catalyst in a fixed layer in a tubular reactor. |
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Method of preparing catalyst carrier and its use in production of catalysts Invention relates to composition intended for producing catalyst carrier, to method of producing said carrier, to catalyst and method of its production, and to method of ethylene oxidation in its presence. Proposed composition comprises the mix of at least one alpha aluminium oxide with mean particle size of about 5 mcm or larger in amount of about 20 wt % to about 40 wt % of total content of aluminium oxide in this composition; at least, one hydrated precursor of alpha aluminium oxide in amount of about 60 wt % to about 80 wt % total content of aluminium oxide in this composition; binder and foaming agent. Invention covers also method of producing catalyst carrier comprising producing above described composition and heating it to convert into porous melted structure, method of producing catalyst comprising deposition of catalytically efficient amount of silver on said catalyst carrier, and catalyst produced as described above. It covers also the method of oxidising ethylene to ethylene oxide comprising gas-phase oxidation of ethylene by molecular oxygen in tubular reactor with stationary layer in the presence of produced catalyst. |
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Nanoscale restructuring of aluminium oxide support surface and alkene oxide synthesis catalyst Invention relates to a support, a method of preparing said support, a catalyst for epoxidation of olefins having said support and a method of oxidising ethylene to ethylene oxide. The invention describes a support for a catalyst used in epoxidation of olefins which has an inert heat-resistant solid substrate having a surface and several projections coming out of the surface which are detected at scanning frequencies in the interval from approximately 250 cycles/micrometre or more. Described is a method of making such a carrier involving processing the surface of the substrate in order to obtain several projections on the surface of the substrate. The invention describes a catalyst for epoxidation of olefins having the support described above and a catalytically effective amount of silver, and a method of oxidising ethylene to ethylene oxide using the said catalyst. |
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Method of making catalyst support Present invention relates to catalysts supports which are used as supports for metal and metal oxide components of catalysts used in different chemical reactions. The invention describes a catalyst support precursor which contains a mixture of alpha aluminium oxide and/or transition aluminium oxide; binder; and a solid sponging agent which expands or releases gas when sufficient heat is supplied. A method of making a catalyst support is described, which involves preparation of the catalyst support precursor described above and water, moulding the obtained precursor into a structure, heating the said structure for a sufficient time and at temperature sufficient for formation of a porous structure as a result of the effect of the sponging agent, and then heating the porous structure for a sufficient time and at temperature sufficient for melting of the porous structure, thereby forming a porous catalyst support. A catalyst preparation method is described, which involves the above described steps for making a porous catalyst support and depositing a catalytically effective amount of silver onto the surface of the support. Described also is a catalyst made using the method described above and a method for oxidising ethylene in the presence of the said catalyst. Described also are catalyst support precursors which contain alpha aluminium oxide and/or transition aluminium oxide, binder, a sponging agent and/or talc or a water-soluble titanium compound, and methods of making the said precursors. |
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Method of producing ethylene oxide Invention relates to a method of producing ethylene oxide by bringing a mixture fed into an epoxidation reactor, which may contain ethylene, oxygen, carbon dioxide and water in a defined concentration, into contact with a highly selective epoxidation catalyst containing a promoter amount of rhenium. Contacting the mixture fed into the epoxidation reactor is done under epoxidation reaction conditions at reaction temperature below 260°C. The said mixture contains carbon dioxide in concentration less than 2 mol % of the entire mixture and concentration of water in the mixture of at most 1.5 mol % of the entire mixture. Observation of the combination of the said conditions for carrying out the epoxidation process improves operational properties of the epoxidation catalyst, for example increased stability, selectivity and activity of the catalyst. |
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Enhanced carriers from aluminium oxide and silver-based catalysts for producing alkylene oxides Invention relates to methods of producing carriers from aluminium oxide which have desirable properties when used as carriers for silver-based catalysts. The method of making a modified catalyst carrier for vapour-phase epoxidation of alkene involves a) saturation of a moulded carrier made from alpha aluminium oxide, which has been burnt and optionally subjected to other types of processing which provide for preforming, as part of the preforming process with at least one modifier, chosen from silicates of alkali metals and silicates of alkali-earth metals; b) drying said saturated carrier and c) burning said dried carrier at temperature not below 800°C. To obtain the catalyst, the method additionally involves stage d) where silver catalytic material is deposited on the said dried carrier. The invention also relates to epoxidation reactions, carried out in the presence of catalysts given above. |
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Method of producing olefin oxide, method of using olefin oxide and catalytic composition Present invention relates to methods of producing a catalytic composition, to the method of producing olefin oxide and method of producing 1,2-diol or 1.2-diol ether. Described is a method of producing a catalytic composition, involving deposition of silver on a carrier and deposition of a promoter - alkali metal on the carrier. The alkali metal contains potassium in amount of at least 10 mcmol/g and lithium in amount of at least 1 mcmol/g in terms of mass of catalytic composition. The alkali metal is deposited on the carrier before depositing silver, at the same time or after depositing silver on the carrier. Described is a method of producing a catalytic composition, involving use of potassium as a promoter in amount of at least 10 mcmol/g and sodium in amount of at least 5 mcmol/g in terms of mass of the catalytic composition. Description is given of a method of producing olefin oxide by reacting olefin, which has at least three carbon atoms, with oxygen in the presence of a catalytic composition, obtained using the method described above. This invention also pertains to the method of producing 1,2-diol or 1,2-diol ether using olefin oxide, obtained using the said method. |
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Method of obtaining alkylene oxide using gas-phase promoter system Additive to reaction of epoxidation represents two-component gas-phase promoter system, which contains chlorine-containing component (for instance, ethyl chloride, methyl chloride, vinyl chloride and ethylene dichloride) and nitrogen-containing component from group of nitrogen monoxide and other compounds able to form in reaction conditions at least one gaseous, increasing efficiency, member of pair of oxidation-reduction semi-reaction, including NO, NO2, N2O3 or N2O4. Quantity of each component of said gaseous promoter is taken in such way as to support ratio N* to Z* within the interval from 0.4 to 1, where N* represents equivalent of nitrogen monoxide, in ppmv, ranging from 1 to 20 ppmv, and Z*=(ethyl chloride equivalent (ppmv))x100%/(ethane equivalent (mol %))x100, ranging from 5 to 40 ppmv. Said equivalents are determined depending on concentrations of nitrogen-containing component, chlorine-containing component and ethane or other hydrocarbon at reactor inlet in accordance with stated in i.1 of the formula. |
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Catalysts for obtaining alkylene oxides, which have improved stability, efficiency and/or activity Described is catalyst for obtaining alkylene oxide by alkene epoxidation in steam phase, which contains applied by impregnation silver and at least one promoter on burnt heatproof solid carrier, and said carrier contains quantity of zirconium component, which is present in carrier mainly as zirconium silicate, and said heatproof carrier, with the exception of zirconium component at least on 95% by weight consists of aluminium alpha-oxide. Also described is method of said catalyst obtaining which includes: a) mixing of zirconium component, which is mainly present as zirconium silicate, with initial materials of carrier, which include aluminium oxide; b) burning of initial materials of carrier with added zirconium component at temperature less than 1540°C with formation of carrier, which includes aluminium alpha-oxide, where carrier includes zirconium component, present mainly as zirconium silicate; c) further deposition of silver and at least one promoter on carrier. In addition, described is method of catalyst application for alkyl oxide obtaining. |
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Method of ethylene oxide production Invention concerns method of ethylene oxide production, involving highly selective epoxidation catalyst including 0.1 to 10 micromol of rhenium per gram of total catalyst weight. Method involves operation of ethylene oxide production system including epoxidation reaction system, ethylene oxide extraction system and carbon dioxide removal system operated in direct connection to each other to ensure ethylene oxide and extraction of ethylene oxide product. To maintain low carbon dioxide concentration in feed mix of epoxidation reactor, major part of gas flow comprising at least 30% to 100%, from ethylene oxide extraction system extracting ethylene oxide from product containing carbon dioxide, is fed to carbon dioxide removal system, which produces gas flow with reduced carbon dioxide content. Gas flow with reduced carbon dioxide content is combined with oxygen and ethylene to obtain feed mix for epoxidation reactor. In addition invention claims method of obtaining 1,2-ethanediene or simple 1,2-ethanediene ether from ethylene oxide, involving obtainment of ethylene oxide by the indicated method. |
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Method of obtaining, at least, one product of partial oxidation and/or ammoxidising of propylene Present invention pertains to perfection of the method of obtaining at least, one product of partial oxidation and/or ammoxidising of propylene, chosen from a group, comprising propylene oxide, acrolein, acrylic acid and acrylonitrile. The starting material is raw propane. a) At the first stage, raw propane, in the presence and/or absence of oxygen, is subjected to homogenous and/or heterogeneous catalysed dehydrogenation and/or oxydehydrogenation. Gas mixture 1, containing propane and propylene is obtained. b) If necessary, a certain quantity of the other components in gas mixture 1, obtained in the first stage, besides propane and propylene, such as hydrogen and carbon monoxide is separated and/or converted to other compounds, such as water and carbon dioxide. From gas mixture 1, gas mixture 1' is obtained, containing propane and propylene, as well as other compounds, besides oxygen, propane and propylene. c) At the third stage, gas mixture 1 and/or gas mixture 1' as a component, containing molecular oxygen, of gas mixture 2, is subjected to heterogeneous catalysed partial gas-phase oxidation and/or propylene, contained in gas mixture 1 and/or gas mixture 1', undergoes partial gas-phase ammoxidising. Content of butane-1 in gas mixture 2 is ≤1 vol.%. The method increases output of desired products and efficiency of the process. |
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Reactor system and method for ethylene oxide production Reactor system comprises reactor tube, which contains compressed layer of molded carrier material, which may include catalytic component. Molded carrier material, for instance, aluminium oxide, has geometric configuration of hollow cylinder. Catalyst contains silver. Hollow cylinder has ratio of rated length to rated external diameter from 0.5 to 2, and ratio of rated external diameter to rated internal diameter, which exceeds 2.7. Reactor system also has such combinations of reactor tube diameter and geometric parameters of molded catalyst carrier, which make it possible to produce compressed layer of catalyst in reaction system with high density of package with minimum pressure drop via compressed layer of catalyst. |
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Method of obtaining olefin oxide Invention relates to method of obtaining olefin oxide including interaction of initial mixture, which contains olefin and oxygen, in presence of silver-containing catalyst. According to claimed method, before catalyst reaches late stage of ageing, temperature of reaction is supported higher than 255°C, and content of olefin in initial mixture is supported within the range from higher than 25 mol % to at most 80 mol %, relative to general initial mixture, said reaction temperature and said olefin content being supported, at least, during period which is sufficient to obtain olefin oxide in amount 1000 kmole of olefin oxide per m3 of catalyst layer. "Late stage of ageing" of catalyst is determined by obtaining total olefin oxide in amount, at least, 10000 kmole of olefin oxide per m3 of catalyst layer. Invention also relates to method of obtaining 1,2-diole, ether, 1,2-diole or alkanolamine. |
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Silver-containing catalysts, obtaining such catalysts and their application Catalyst contains silver, applied on profiled carrier with geometric configuration in form of hollow cylinder, in which ratio of length to outer diameter lies within interval from 0.3 to 2, and inner diameter constitutes up to 30% of outer diameter of said profiled carrier with assumption that when carrier contains more than one channel, inner diameter is considered to be the diameter of one channel with area of transverse section equal to the sum of areas of transverse sections of all channels. Described is method which includes obtaining profiled carrier with geometric configuration in form of hollow cylinder described above, and application of silver on profiled carrier. Described is method of obtaining ethylene oxide which includes: contacting under suitable epoxidation conditions of raw material flow, containing ethylene and oxygen, with described above catalyst. Also described is method of obtaining ethylene glycol, ethylene glycol ester, or 1,2-alkanolamine, which includes using ethylene oxide obtained by described above method and its conversion to ethylene glycol, ethylene glycol ester or 1,2-alaknolamine. |
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Catalyst and method of its application Catalyst contains carrier and silver, applied on carrier, in amount of at least, 10 g/kg with respect to catalyst weight, where carrier has specific surface area of at least 1.4 m2/g and such pore distribution by size, that pores with diameter in interval from 0.2 to 10 mcm constitute more than 85% of general pore volume, and such pores together form pore volume of at least 0.27 ml/g with respect to carrier weight; method of catalyst obtaining and method of olefin epoxidation, which includes interaction of olefin with oxygen in presence of said catalyst. |
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Novel water hydrogen peroxide solutions Claimed is water solution of hydrogen peroxide, suitable for olefine epoxidation, which includes: I) in total less than 50 wt fraction/mln of alkaline metals, alkaline-earth metals or their combinations irrespective of whether said alkaline or alkaline-earth metals are in catione-active or complex form; II) in total at least 50 wt fraction/mln of amines, which have pkb value less than 4.5, or respective protonated compounds; and III) in total at least 100 wt fraction/mln anions or compounds, which are able to dissociate with anion formation, according to which values in wt fraction/mln are given in terms of hydrogen peroxide weight. Claimed is method of obtaining hydrogen peroxide solution. Claimed is application of water solution of hydrogen peroxide. |
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Method of molecular ethylene oxidation According to the present invention, ethylene is oxidised in contact with mix of heterogeneous catalyst in particles and solid inert substance in particles, treated with alkali metal, in oxidation conditions. |
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Oxidation catalyst of ethylene Oxidation catalyst of ethylene in ethylene oxide is described, free from rhenium and transition metal, which is solid silver and containing the combination of promoters consisting of (1) alkaline metals in quantity 400-1500 ppm by weight of the catalyst, (2) barium in the quantity 5-500 ppm by the weight of the catalyst and (3) sulfur in the quantity 5-300 ppm by the weight of the catalyst. Also described is the method of obtaining ethylene oxide, including the interaction of ethylene and molecular oxygen in the presence of the above described catalyst. |
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Method of perfecting process of producing ethylene oxide Invention pertains to ethylene oxide and to the method of obtaining 1,2-ethanediol or a simple ether of 1,2-ethanediol, from ethylene oxide, obtained using the proposed method. The process of producing ethylene oxide involves an epoxidation reactor system, containing a volume of a high octane epoxidation catalyst. The method involves replacing part of the volume of the high octane epoxidation catalyst with a volume of highly selective catalyst and modification of the process system so as to provide for initial raw materials of the reactor of the epoxidation system, with low concentration of carbon dioxide. |
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Method for olefines epoxidation and applied catalyst Method for olefine epoxidation is invented which includes the reaction of the raw material containing olefine, oxygen and organic halogenide, in presence of the catalyst containing silver and rhenium precipitated on the carrier where the catalyst contains rhenium at 1.5 mol/kg of the catalyst mass, at maximum, and 0.0015 mmol/m3 of the carrier surface, at maximum, and where the reaction temperature is increased so as to partially reduce the effect of catalyst loss, and the halogenide is presented in relative Q amount which is maintained constant and where the relative amount of Q is the ratio of the effective molar amount of the active halogen compound in the raw material, to the effective molar amount of hydrocarbon, in the raw material. The invention also implies the method for producing the 1,2-diol, the simple ether of the 1,2-diol and/or alkanolamine and the catalyst to be applied in the said method. |
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Method of producing olefin oxide, method of application of olefie oxide and catalytic composition Principle refers to the method of producing olefin oxide, method of application of the produced olefin oxide and the production of 1,2-diol or simple ether 1-,2-diol and catalytic composition. The mentioned catalytic composition for the production of olefin oxide contains silver and activating agent, that consists of an alkaline metal on a bearer where the activating alkaline metal contains potassium whose quantity is not less than 5 mcmol/g of metal relative to the mass of the catalytic composition and not less than 1 mcmol/g alkaline metal from the group that contains lithium, sodium and there mixtures in which the mentioned bearer contains calcium carbonate joined with silver. The relative mass of silver: calcium carbonate is 1:5 to 1:100, and the unit surface area of the bearer is from 1 m/g to 20 m/g, and the apparent porosity of the bearer is 0.05 ml/g to 2 ml/g. The explained method of producing olefin oxide, include interaction of olefin, that has 3 or more carbon atoms, with oxygen in the presence of the above mentioned catalytic system, and the method of producing 1,2-diol or simple ether 1,2-diol, in which the olefin oxide is produced from the explained method. |
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Method of improving selectivity of catalyst and a olefin epoxidation process Method of improving selectivity of highly selective epoxidation catalyst on support containing silver in amount at most 0.19 g per 1 m2 of the support surface area comprises bringing catalyst or catalyst precursor containing silver in cationic form into contact with oxygen-containing raw material at catalyst temperature above 250°C over a period of time more than 150 h, after which catalyst temperature is lowered to at most 250°C. Olefin epoxidation process comprises bringing above-described supported catalyst or catalyst precursor into contact with oxygen-containing raw material at catalyst temperature above 250°C over a period of time more than 150 h, after which catalyst temperature is lowered to at most 250°C and catalyst is brought into contact with raw material containing olefin and oxygen. |
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Method of initiating epoxidation process, catalyst and epoxidation process Invention relates to olefin epoxidation method and methods for preparing 1,2-diol or 1,2-diol ether, or alkylamine including conversion of olefin oxide into 1,2-diol or 1,2-diol ether, or alkylamine. Olefin epoxidation method comprises: (a) preliminarily impregnating high-selectivity silver-based epoxidation catalyst with organohalogen compound; (b) passing, over preliminarily impregnated catalyst, a material free of organohalogen compound or containing it in concentration not higher than 2·10-4 mol % (calculated for halogen) over a period of time from 15 h to 200 h; and (c) contacting resulting catalyst with material containing olefin, oxygen, and organohalogen compound wherein concentration of organohalogen compound is by at least 0.2·10-4 mol % higher than that of compound in step (b). Preparation of 1,2-diol, 1,2-diol ether, or alkylamine is also described. |
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Method and system for olefin epoxydation Claimed method includes interaction of raw materials containing olefin, oxygen and reaction modifying agent in presence high selective silver-based catalyst at reaction temperature of T. Relative amount of reaction modifying agent is Q, wherein Q is ratio of effective molar amount of active sites of reaction modifying agent representing in raw materials to effective molar amount of hydrocarbon representing in raw materials. Epoxydation process is carried out in the first process phase wherein T=T1 and Q=Q1. Further process is carried out in the second process phase at T=T2 and Q=Q2, wherein T2 and Q2 are differ from T1 and Q1. Q2 is calculated according to equation Q2 = Q1 + B(T2 - T1) wherein B represents constant more than 0. Also disclosed are method for production of 1,2-diol or 1,2-diol ether; reaction system used in investigation; computer program product for calculations and computer system including said program product and information processing system. |
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Method and systems for epoxidation of olefin Invention relates to a method for the epoxidation reaction of olefin. Method involves interaction of the parent olefin-containing raw, oxygen and an agent modifying reaction in the presence of a silver-base catalyst. Agent modifying the reaction presents in the relative amount Q that represents the ratio of effective molar amount of active parts of reaction modifying agent presenting in the parent raw to the effective molar amount of hydrocarbons presenting in the parent raw. Proposed method involves the following steps: interaction in the first stage of process wherein Q values are equal to Q1 and the following interaction in the second step of process wherein the composition of the parent raw differs from composition of the parent raw used in the first step of process and Q value is equal to Q2 wherein value Q2/Q1 = 0.5-1.5. Also, invention relates to a method for synthesis of 1,2-diol or 1,2-diol ether, system for realization of method, the end product and a computer system suitable for using with proposed method. |
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Olefin epoxidation catalyst carrier and a method for preparation thereof Invention relates to creating carriers for catalysts used in epoxidation of olefins and provides catalyst containing at least 95% α-alumina with surface area 1.0 to 2.6 m2/g and water absorption 35 to 55%, and which has pores distributed such that at least 70% pore volume is constituted by pores 0.2 to 10 μm in diameter, wherein pores with diameters 0.2 to 10 μm form volume constituting at least 0.27 ml/g of carrier. Also described is a method for preparing catalyst carrier, which envisages formation of mixture containing 50-90% of first α-alumina powder with average particle size (d50) between 10 and 90 μm; 10-50% (of the total weight of α-alumina) of second α-alumina powder with average particle size (d50) between 2 and 6 μm; 2-5% aluminum hydroxide; 0.2-0.8% amorphous silica compound; and 0.05-0.3% alkali metal compound measured as alkali metal oxide, all percentages being based on total content of α-alumina in the mixture. Mixture of particles is then calcined at 1250 to 1470°C to give target carrier. |
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Ethylene oxidation catalyst and a method for preparing the same Invention provides catalyst for oxidation of ethylene into ethylene oxide, which catalyst contains no rhenium and no transition metals and comprises up to 30% silver on solid support and promoter combination mainly consisted of (i) component containing alkali metal on amount from 700 to 3000 ppm of the mass of catalyst and (ii) component containing sulfur in amount from 40 to 100% by weight of amount required to form alkali metal sulfate and, optionally, a fluorine-containing component in amount from 10 to 300 ppm of the mass of catalyst. Ethylene oxide is produced via reaction of ethylene with molecular oxygen in presence of above-defined catalyst. |
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Method for ethylene epoxydation Invention relates to a method for vapor-phase oxidation of ethylene to ethylene oxide. Method involves interaction of ethylene and oxygen in the presence of silver-base highly selective catalyst. On the onset stage of process fresh catalyst is used and on the additional stage of process when cumulative productivity enhances 0.01 kT of ethylene oxide per m3 of catalyst by ethylene oxide the concentration of ethylene is increased in the reaction mixture. Also, invention relates to a method for using ethylene oxide for preparing 1,2-ethanediol or corresponding 1,2-ethanediol ether involving conversion of ethylene oxide to 1,2-ethanediol or 1,2-ethanediol ether wherein ethylene oxide has been prepared by this method for producing ethylene oxide. |
Another patent 2531319.