Oxide catalyst and method of producing thereof, as well as methods of producing unsaturated aldehyde, diolefin and unsaturated nitrile

FIELD: chemistry.

SUBSTANCE: oxide catalyst has the following characteristics: (1) the oxide catalyst comprises molybdenum, bismuth, iron, cobalt and element A which ionic radius is larger than 0.96 Å (except for potassium, cesium and rubidium); (2) the atomic ratio of a bismuth to 12 atoms of molybdenum 1≤a≤5 the atomic ratio of b iron to 12 atoms of molybdenum is 1,5≤b≤6, the atomic ratio of the c element A to 12 atoms of molybdenum is 1≤c≤5, and the atomic ratio of d cobalt to 12 atoms of molybdenum is 1≤d≤8; and (3) the oxide catalyst comprises a disordered phase, which consists of a crystal system which comprises molybdenum, bismuth, iron and the element A. Method of producing oxide catalyst, method of producing unsaturated aldehyde, method of producing diolefin and method of producing unsaturated nitrile are proposed as well.

EFFECT: invention provides an oxide catalyst which prevents reductive decomposition of catalyst even during industrial operation for a long time.

14 cl, 16 dwg, 11 tbl, 43 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: described is a catalyst for producing ethylene or propylene which contains ruthenium oxychloride RuOxCl4-2x, deposited on a support, where x is greater than 0 but less than 2. The support is titanium oxide or tin oxide. The process is carried out at 200-250°C, and the catalyst used is the catalyst described above. The process is carried out in a flow reactor.

EFFECT: improved catalyst selectivity and low temperature of the process of oxidative dehydrogenation of ethane to ethylene and propane to propylene.

5 cl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing ethylene via oxidative dehydrogenation of ethane in a gaseous mixture of oxygen and ethane at high temperature in the presence of a mixed oxide catalyst of the composition Mo1.0V0.37Te0.17Nb0.12O3 in a flow reactor. The reactor further includes a selective carbon monoxide oxidation catalyst, which is gold or rhodium on a titanium dioxide support, with the following ratio of components, wt %: gold 0.05-0.3, rhodium 0.5-1.0 and titanium dioxide - the balance, wherein the mixed oxide catalyst is located at the gaseous material inlet, and the selective carbon monoxide oxidation catalyst is located further downstream of the gas stream and the catalysts are taken in volume ratio of 80-90 and 20-10, respectively.

EFFECT: use of the disclosed method enables to achieve high conversion of oxygen, which facilitates further separation of ethylene from the reaction mixture and also makes reaction gaseous mixtures less explosive; the proposed volume ratio of catalysts loaded into the reactor enables to combine two reactions in a single process to obtain ethylene with a minimum amount of undesirable impurities.

4 cl, 4 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing ethylene, which includes a step for oxidative condensation of methane in a gaseous mixture at atmospheric pressure and high temperature in the presence of a catalyst containing manganese and sodium tungstate on a silicon oxide support. The a catalyst which further contains cerium oxide is used at the step for oxidative condensation of methane, with the following ratio of components, wt %: manganese 1-2, sodium tungstate 3-5, cerium oxide 3-4 and silicon oxide - the balance, and the process is carried out in a flow-type double-deck reactor by contacting a fixed catalyst bed for oxidative condensation of methane, located on the upper deck of the decked reactor and heated to 750-800°C, with a methane-air mixture or methane-oxygen mixture in the ratio CH4/O2=4-7/1, with volume rate of feeding the gaseous material of 1000-5000 h-1,followed by mixing the formed reaction gases heated to 750-800°C, said gases containing an ethane-ethylene fraction with an additional amount of cold air fed into the space between the decks, and the obtained gaseous mixture with ratio C2H6/O2=2/1 is fed into the lower deck of the reactor and contacted with a catalyst for oxidative dehydrogenation of ethane located therein, which is a mixed oxide composition of the formula Mo1.0V0.37Te0.17Nb0.12O3, heated to 380-420°C.

EFFECT: use of the present method enables to achieve high selectivity and efficiency with respect to formation of ethylene while simultaneously reducing power consumption.

3 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of regenerating a catalyst layer and a method of producing acrolein and/or acrylic acid via heterogeneously catalysed partial gas-phase oxidation of propylene. The method of regenerating a catalyst layer which is deactivated during heterogeneously catalysed partial dehydrogenation of a hydrocarbon involves passing a regenerating gas through a layer of deactivated catalyst for a period of time t, said gas being at high temperature and containing molecular oxygen and an inert gas but not containing a hydrocarbon, under the condition that during the regeneration process total content GA of carbon oxides in the regenerating gas passed through the catalyst layer at the outlet of the catalyst layer within a period of time t at least periodically exceeds total content GE of carbon oxides in the regenerating gas passed through the catalyst layer at the inlet of the catalyst layer, wherein the corresponding content values are expressed as a percentage of the volume (vol. %) of the regenerating gas and wherein the difference ΔG=GA-GE before the end of the regeneration process passes through a maximum ΔGmax, where: a) 0.2 vol. % ≤ ΔGmax≤ to 5 vol. %, and b) content of molecular oxygen in the regenerating gas to be passed through the catalyst layer expressed in vol. % of the regenerating gas, for a period of time t before the end of the regeneration process, is increased at least thrice, wherein the increase in content of molecular oxygen each time is at least 2 vol. %. In the method of producing acrolein and/or acrylic acid, the catalyst layer is regenerated using the disclosed regeneration method from time to time.

EFFECT: susceptibility of the regenerated catalyst layer to deactivation is not different from susceptibility of a freshly loaded catalyst to deactivation.

22 cl, 3 tbl, 4 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method for continuous, heterogeneously catalysed partial dehydrogenation of at least one dehydrogenated (C2-C4)-hydrocarbon in gas phase, comprising a procedure where at least one initial gas stream is continuously fed into a reaction space surrounded by jacket which touches the reaction space and has at least one opening for inlet of at least one initial gas stream in the reaction space and at least a second opening for outlet of at least one stream of the formed gas from the reaction space, said initial gas stream containing at least one dehydrogenated hydrocarbon; in the reaction space at least one dehydrogenated hydrocarbon passes through at least one layer of catalyst lying in the reaction space to obtain a gaseous product which contains at least one dehydrogenated hydrocarbon which does not react with the dehydrogenated hydrocarbon; and using an oxidative or a non-oxidative method, molecular hydrogen and/or water vapour are partially dehydrogenated to form at least one dehydrogenated hydrocarbon; at least one stream of the formed gas is continuously removed from the reaction space; the method is characterised by that the surface of the jacket on the side in touch with the reaction space is made from steel S, partially in a layer of thickness d equal to at least 1 mm, said steel having the following composition: from 18 to 30 wt % Cr (chromium), from 9 to 36 wt % Ni (nickel), from 1 to 3 wt % Si (silicon), from 0.1 to 0.3 wt % N (nitrogen), from ≥ 0 to 0.15 wt % C (carbon), from ≥ 0 to 4 wt % Mn (manganese), from ≥ 0 to 4 wt % Al (aluminium), from ≥ 0 to 0.05 wt % P (phosphorus), from ≥ 0 to 0.05 S (sulphur) and from ≥ 0 to 0.1 wt % one or more rare-earth metals, and in the rest Fe and impurities due to the synthesis process, where the percentages are associated with total weight, respectively. The invention also relates to a jacket in which the disclosed method is realised.

EFFECT: use of the present invention enables to reduce catalysed thermal decomposition of dehydrogenated hydrocarbon and/or a hydrocarbon capable of being dehydrogenated.

30 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing ethylene, and ethylene and acetic acid from initial gas containing ethane and oxygen when said gas gets into contact with a MoaVvTaxTeyOz catalyst, in which a equals 1.0, v ranges from approximately 0.01 to approximately 1.0, x ranges from approximately 0.01 to approximately 1.0, y ranges from approximately 0.01 to approximately 1.0 and z is the number of oxygen atoms required to transform the catalyst into an electrically neutral state.

EFFECT: use of the methods enables to obtain said products with high selectivity and high output in a single step in unit time under reaction conditions.

30 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: 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.

EFFECT: increased output of desired products and efficiency of the process.

72 cl, 10 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for oxidation of (C2-C4)-alkane and preparing the corresponding alkene and carboxylic acid. Method involves addition of this alkane to contact with molecular oxygen-containing gas in oxidative reaction zone and optionally at least one corresponding alkene and water in the presence of at least two catalysts with different selectivity. Each catalyst is effective in oxidation of alkane to corresponding alkene and carboxylic acid resulting to formation of product comprising alkene, carboxylic acid and water wherein the molar ratio between alkene and carboxylic acid synthesized in the reaction zone is regulated or maintained at the required level by regulation the relative amounts of at least two catalyst in the oxidative reaction zone. Also, invention relates to the combined method for preparing alkyl carboxylate comprising abovementioned stage in preparing alkene and carboxylic acid in the first reaction zone. Then method involves the stage for addition of at least part of each alkene and carboxylic acid prepared in the first reaction zone to the inter-contacting in the second reaction zone the presence of at least one catalyst that is effective in preparing alkyl carboxylate to yield this alkyl carboxylate. Also, invention relates to a method for preparing alkenyl carboxylate comprising the abovementioned stage for preparing alkene and carboxylic acid in the first reaction zone and stage for inter-contacting in the second reaction zone of at least part of each alkene and carboxylic acid synthesized in the first reaction zone and molecular oxygen-containing gas in the presence of at least one catalyst that is effective in preparing alkenyl carboxylate and resulting to preparing this alkenyl carboxylate.

EFFECT: improved method for oxidation.

30 cl, 1 dwg, 5 tbl, 14 ex

FIELD: petrochemical processes.

SUBSTANCE: invention relates to improved C2-C4-alkane oxidation process to produce corresponding alkene and carboxylic acid, which process comprises bringing indicated alkane in oxidation reaction zone into contact with molecular oxygen-containing gas and corresponding alkene and optionally with water in presence of at least one catalyst efficient for oxidation of alkane into corresponding alkene and carboxylic acid. Resulting product contains alkene, carboxylic acid, and water, wherein alkene-to-carboxylic acid molar ratio in oxidation reaction zone is controlled or maintained at desired level by way of controlling alkene and optional water concentrations in oxidation reaction zone and also, optionally, controlling one or several from following parameters: pressure, temperature, and residence time in oxidation reaction zone. Invention also relates to integrated process of producing alkyl carboxylate including above-indicated stage of producing alkene and carboxylic acid in first reaction zone and stage of bringing, in second reaction zone, at least part of each of alkene and carboxylic acid obtained in first reaction zone in contact with each other in presence of at least one catalyst effective in production of alkyl carboxylate to produce the same. Invention further relates to production of alkenyl carboxylate including above-indicated stage of producing alkene and carboxylic acid in first reaction zone and stage of bringing, in second reaction zone, at least part of each of alkene and carboxylic acid obtained in first reaction zone plus molecular oxygen-containing gas into contact with each other in presence of at least one catalyst effective in production of alkenyl carboxylate to produce the same.

EFFECT: enhanced process efficiency.

55 cl, 1 dwg, 7 tbl, 22 ex

FIELD: chemistry.

SUBSTANCE: invention relates to novel compounds of formula (I), which can be applied as an aromatic compound or a smell-masking agent. In formula (I) R stands for a hydrogen atom, C1-C6 alkyl, C2-C6 alkenyl or =CH2; Z stands for CN or CHO; and there is not more than one dashed bond. The following conditions must be observed: if Z stands for CHO and there is one of the dashed bonds, R does not stand for a hydrogen atom, and if there is a dashed bond between carbons Ca and Cb, R does not stand for a group = CH2. The invention also relates to a method of obtaining a formula (I) compound, its application as the aromatic compound or the smell-masking agent, and a perfumery composition.

EFFECT: increased activity of the composition application.

10 cl, 1 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of obtaining acrolein from glycerol. Dehydration of glycerol is carried out in the presence of a catalyst based on zirconium oxide, consisting at least of: a) mixed zirconium oxide and at least of one metal M, where the said metal is selected from niobium and vanadium, b) zirconium oxide and at least one metal M oxide, where the said metal is selected from niobium, tantalum and vanadium, c) silicon oxide and mixed zirconium oxide and at least one metal M, where the said metal is selected from tungsten, cerium, manganese, niobium, tantalum, titanium, vanadium and silicon, d) titanium oxide, mixed zirconium oxide and at least one metal M, where the said metal is selected from tungsten, cerium, manganese, niobium, tantalum, titanium, vanadium and silicon. The invention also relates to a method of obtaining 3-(methylthio)propionic aldehyde from acrolein and to application of a catalyst, selected from the catalysts a), b), c) or d) for conversion of glycerol into acrolein.

EFFECT: method makes it possible to obtain acrolein by catalytic dehydration of glycerol in the presence of catalyst, which provides conversion of all initial glicerine and at the same time can be easily regenerated during short time without losing activity and selectivity and possesses a long service term.

13 cl, 4 dwg, 5 tbl, 18 ex

FIELD: chemistry.

SUBSTANCE: described is a method of making catalytically active geometric moulded articles K, which contain as active mass, a multi-element oxide I with general stoichiometric formula (I): [BinZ1bOx]p[BicMo12FedZ2eZ3fZ4gZ5hZ6iOy]1 (I), according to which Z1 denotes tungsten or tungsten and molybdenum, under the condition that the amount of tungsten is at least 10 mol % of the total molar amount Z1, Z2 denotes an element or multiple elements selected from a group which includes nickel and cobalt, Z3 denotes an element or multiple elements selected from a group which includes alkali metals, alkali-earth metals and gallium, Z4 denotes an element or multiple elements selected from a group which includes zinc, phosphorus, arsenic, boron, antimony, tin, cerium, vanadium and chromium, Z5 denotes an element or multiple elements selected from a group which includes silicon, aluminium, titanium, tungsten and zirconium, Z6 denotes an element or multiple elements selected from a group which includes copper, silver, gold, yttrium, lanthanum and lanthanides, a is a number from 0.1 to 3, b is a number from 0.1 to 10, d is a number from 0.01 to 5, e is a number from 1 to 10, f is a number from 0.01 to 2, g is a number from 0 to 5, h is a number from 0 to 10, i is a number from 0 to 1, p is a number from 0.05 to 6, and x, y are respectively numbers defined by valence and number of atoms other than oxygen atoms in formula (1), wherein a fine mixed oxide BiaZ'bOx is formed in form of a starting mass A1, the particle diameter d50A1 of which satisfies the condition 1mcmd50A1100mcm, using sources, other than oxygen, of elements of the component part T of the multi-element oxide I, represented by [BicMo12FedZ2cZ3fZ4gZ5hZ6iOy]i, a homogeneous aqueous mixture M is formed in an aqueous medium, wherein: each of the sources used when forming the aqueous mixture M passes through a dispersion degree Q, characterised by that the particle diameter corresponds to d90Q5mcm, and the aqueous mixture M contains bismuth, molybdenum, iron, Z2, Z3, Z4, Z3 and Z6 in the stoichiometric formula (I*): BicMo12FedZ2cZ3fZ4gZ5hZ6i (I*); from the aqueous mixture M, by drying and controlling the dispersion degree d90A2, a fine starting mass A2 is formed, the particle diameter d90A2 of which satisfies the condition400mcmd90A210mcm; the starting mass A1 is mixed with starting mass A2 or the starting mass A1, starting mass A2 and a fine auxiliary moulding agent are mixed to obtain a fine starting mass A3, which contains elements of the multi-element oxide I other than oxygen that are introduced therein through starting mass A1 and A2, in stoichiometric formula (1**): [BiaZ'b]p[BicMo12FedZ2eZ3fZ4gZ5hZ6i]l (I**);geometric moulded articles V are formed from the fine starting mass A3; the moulded articles V undergo heat treatment at high temperature to obtain catalytically active geometric moulded articles K, wherein the stoichiometric coefficient "c" lies in the range 0<c≤0.8.

EFFECT: described is a method for heterogeneously catalysed partial gas-phase oxidation of an alkane, alkanol, alkanal, alkene and/or alkenal containing 3-6 carbon atoms in a catalyst bed, wherein the catalyst bed contains catalytically active moulded articles which can be made using said method.

15 cl, 3 tbl, 13 ex

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing catalytic moulded articles and use thereof. Described is a method of making catalytically active geometric moulded articles K, which contain as active mass, a multi-element oxide I with general stoichiometric formula (I): [BilWbOx]a[Mo12Z1cZ2dFeeZ3fZ4gZ5hOy]l (I), in which Z1 denotes an element or multiple elements selected from a group which includes nickel and cobalt, Z2 denotes an element or multiple elements selected from a group which includes alkali metals, alkali-earth metals and thallium, Z3 denotes an element or multiple elements selected from a group which includes zinc, phosphorus, arsenic, boron, antimony, tin, cerium, vanadium, chromium and bismuth, Z denotes an element or multiple elements selected from a group which includes silicon, aluminium, titanium, tungsten and zirconium, Z5 denotes an element or multiple elements selected from a group which includes copper, silver, gold, yttrium, lanthanum and lanthanides, a is a number from 0.1 to 3, b is a number from 0.1 to 10, c is a number from 1 to 10, d is a number from 0.01 to 2, e is a number from 0.01 to 5, f is a number from 0 to 5, g is a number from 0 to 10, h is a number from 0 to 1, and x, y are respectively defined by valence and number of atoms other than oxygen in formula (I), wherein a fine mixed oxide BilWbOx is formed in form of a starting mass A1, the particle diameter d50A1 of which satisfies the condition 1 mcm ≤ d50A1 ≤10 mcm; a homogeneous aqueous mixture M is formed in an aqueous medium using sources, other than oxygen, of elements of the component part T=[Mo12ZlcZ2dFeeZ3fZ4gZ5hOy]l of the multi-element oxide I, wherein: each of the sources used when forming the aqueous mixture M passes through a dispersion degree Q, which corresponds to particle diameter d90Q ≤ 5 mcm, and the aqueous mixture M contains molybdenum, Z1, Z2, iron, Z3, Z4 and Z5 in the stoichiometric formula (I*): Mo12ZlcZ2dFecZ3fZ49Z5h (I*); from the aqueous mixture M, by drying and controlling the dispersion degree, a fine starting mass A2 is formed, the particle diameter d90A2 of which satisfies the condition 200 mcm ≥ d90A2 ≥ 20 mcm; the starting mass A1 is mixed with starting mass A2 or the starting mass A1, starting mass A2 and a fine auxiliary moulding agent are mixed to obtain a fine starting mass A3, which contains elements of the multi-element oxide I other than oxygen that are introduced therein through starting mass A1 and A2, in stoichiometric formula (1**): [BilWb]a[Mo12ZlcZ2dFeeZ3fZ4gZ5h]i (I**); geometric moulded articles V are formed from the fine starting mass A3, and the moulded articles V undergo heat treatment at high temperature to obtain catalytically active geometric moulded articles K, wherein the product F:(d50A1)0,7(d90A2)1,5(a1) is ≥820.

EFFECT: described is a method for heterogeneously catalysed partial gas-phase oxidation of an alkane, alkanol, alkanal, alkene and/or alkenal containing 3-6 carbon atoms in a catalyst bed, wherein the catalyst bed contains catalytically active moulded articles made using said method.

15 cl, 8 dwg, 10 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: described is a method of producing acrolein by dehydrating glycerol in the presence of tungsten compound-containing solid-phase catalysts with Hammett acidity H0 less than +2, which contain palladium as a promoter.

EFFECT: high output and enabling catalyst regeneration without loss of properties thereof.

23 cl, 3 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of catalyst for producing unsaturated aldehyde and unsaturated carboxyl acid. Proposed method comprises applying catalyst powder coating on inert substrate to produce applied catalyst wherein inert substrate features ring shape and has outer periphery bent in longitudinal direction of substrate. Note here that catalyst is produced in atmosphere of granulating chamber at application of coating to ensure absolute humidity of 0.01 and higher. Catalyst thus produced is used for gas-phase oxidation of propylene, isobutylene, tert-butyl alcohol or methyl-tert-butyl ether to produce appropriate unsaturated aldehyde, or for gas-phase oxidation of said aldehyde to produce carboxylic acid.

EFFECT: higher activity and friction stability at high yield of target product.

4 cl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of transferring heat to a liquid mixture containing at least one (meth)acrylic monomer selected from a group comprising acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, glycidyl acrylate, glycidyl methacrylate, methyl acrylate, methyl methacrylate, n-butyl acrylate, isobutyl acrylate, isobutyl methacrylate, n-butyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, ethyl acrylate, ethyl methacrylate, 2-ethylhexyl acrylate and 2-ethylhexyl methacrylate, through an indirect heat exchanger on whose primary side a fluid heat carrier flows and on whose secondary side simultaneously flows said liquid mixture containing at least one (meth)acrylic monomer, wherein the liquid mixture containing at least one (meth)acrylic monomer, in order to reduce contamination, additionally contains at least one active compound other than (meth)acrylic monomers which is selected from a group consisting of tertiary amines, salts formed from a tertiary amine and a Bransted acid, and quaternary ammonium compounds, under the condition that none of the tertiary and quaternary nitrogen atoms in the at least one active compound bears a phenyl group but at least some of said tertiary and quaternary nitrogen atoms bear at least one alkyl group.

EFFECT: improved method.

15 cl, 16 ex

FIELD: chemistry.

SUBSTANCE: invention relates to campholene derivatives of general formula (I), a fragrant or aromatic flavouring composition and use thereof in perfumery to obtain perfumed bases and concentrates, as aromatic agents for producing flavouring compositions or products, as agents which mask smell and/or taste, including in a combination with other perfumery or aromatic ingredients, solvents and additives. In general formula (I) , R1, R2, R3, R4 and R5 each independently denote a hydrogen atom or a linear or branched C1-C5 alkyl or C2-C5 alkenyl group, - Y denotes CN, C(O)R6 or a CR6(ORα)(ORβ) group, where R6 denotes a hydrogen atom or a linear or branched C1-C5 alkyl or C2-C5 alkenyl group, and Rα and Rβ simultaneously denote a linear or branched C1, C2, C3, C4 or C5 alkyl or C2, C3, C4 or C5 alkenyl group, the - 5-member ring is saturated or contains a double bond between C3' and C4' in formula (I), and the side chain, if necessary, contains a double bond between C1 and C2 and/or between C3 and C4, under the condition that said derivative is not 3-methyl-6-(2,2,3-trimethyl-cyclopent-3-enyl)-hex-4-enal.

EFFECT: use of campholene derivatives to obtain perfumed bases and concentrates.

10 cl, 1 tbl, 2 dwg, 20 ex

FIELD: blasting.

SUBSTANCE: in the first reaction zone A at least two gaseous supply flows are supplied, containing propane, at least one of which contains fresh propane, to produce a reaction gas A; - in the reaction zone A the reaction gas A passes through at least one layer of catalyst, in which, by means of partial heterogeneous-catalysed dehydration of propane, molecular hydrogen and propylene are produced; - molecular oxygen is supplied into the reaction zone A, which oxidises in the reaction zone A at least a part of molecular hydrogen contained in the reaction gas A to water vapour - the gas-product A is taken from the reaction zone A, containing propylene, propane, molecular hydrogen and water vapour; B) water vapour contained in the gas-product A, if necessary, fully or partially by means of direct and/or indirect cooling, is separated in the first zone of separation I by the method of condensation with preservation of the gas-product A*; C) in the reaction zone B, by supply of molecular oxygen, the gas-product A or the gas-product A* is used to supply at least into one oxidisation reactor with the reaction gas B, comprising propane, propylene and molecular hydrogen, and propylene contained in it is exposed to heterogeneous-catalysed partial oxidation in the gas phase to produce acrolein or acrylic acid or their mixture as a target product, and also the gas-product B containing non-converted propane; D) from the reaction zone B the gas-product B is released, and the target product contained in it is separated in the second separation zone II, besides, the residual gas containing propane remains; E) whenever necessary, a part of the residual gas is returned having the composition of the residual gas, as a supply flow containing propane, into the reaction zone A; F) in the zone of separation III propane contained in the residual gas that has not been returned into the reaction zone A, from which earlier, if required, water vapour contained in it has been removed, possibly, by condensation and/or using a separating membrane, molecular hydrogen contained in it has been fully or partially removed, is separated by means of absorption in an organic dissolvent (absorbent) with production of absorbate containing propane; and G) in the separation zone IV propane is separated from absorbate and returned into the reaction zone A in the form of a supply flow containing propane, besides, in the reaction zone A enough amount of molecular hydrogen is oxidised to water vapour so that this hydrogen amount oxidised in the reaction zone A to the water vapour makes from 30 to 70 mol% of molecular hydrogen amount produced in the reaction zone A, and for values of the working pressure P in each case identified at the inlet to an appropriate area, in different zones of the method under the invention the following ratios are in effect: Preaction zone A>Pseparation zone I>Preaction zone B>Pseparation zone II>Pseparation zone III>Pseparation zone IV>Preaction zone A.

EFFECT: higher yield.

27 cl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing at least one product from acrolein and acrylic acid via partial oxidation of propylene, where a) purified propane is converted at the first reaction step in the presence and/or absence of molecular oxygen, at least one dehydrogenation from a group comprising homogeneous dehydrogenation, heterogeneous catalytic dehydrogenation, homogeneous oxydehydrogenation and heterogeneous catalytic oxydehydrogenation, wherein a gaseous mixture 1 is obtained, which contains unconverted propane and the formed propylene, and b) optional separation from the total amount or partial amount of the gaseous mixture 1 of a partial amount of components other than propane and propylene contained therein, e.g., hydrogen, carbon monoxide, water vapour and/or optional conversion thereof to other compounds, e.g., water and carbon dioxide, and where a gaseous mixture 1' is obtained, which contains propane and propylene, and on at least one of the following reaction steps, c) the gaseous mixture 1 or gaseous mixture 1' or a mixture from the formed gaseous mixture 1' and the remaining gaseous mixture 1 as a component of a gaseous mixture 2 are subjected to heterogeneous catalytic gas-phase partial oxidation of propylene contained in gaseous mixture 1 and/or gaseous mixture 1', wherein a gaseous mixture 3 is obtained, which contains at least one product, d) on at least one separation step, the product is separated from gaseous mixture 3 and from the remaining residual gas, at least propane is returned to the first reaction step, where purified propane is obtained from crude propane which contains ≥90 wt % propane, ≤99 wt % propane and propylene, ≥100 ppm hydrocarbons, having 2 carbon atoms, and ≥100 ppm hydrocarbons, having 4 carbon atoms, under the condition that crude propane is fed into the fractionation column and purified propane is obtained higher than the feeding point under the condition that content of hydrocarbons having 2 carbon atoms, in wt %, in terms of the contained propane, in the purified propane is more than 100% of the corresponding content in crude propane and content of hydrocarbons having 4 carbon atoms, in wt %, in terms of content of propane, in the purified propane is at most 50% of the corresponding content in crude propane.

EFFECT: method enables to cut design expenses owing to no separation of C2-hydrocarbons during distillation.

48 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to field of catalysis. Described is method of manufacturing geometrical moulded products from catalyst K, in which active mass represents multi-element oxide, which contains Mo element, Bi and/or V elements, as well as one or several elements from series Co, Ni, Fe, Cu and alkali metals, in which highly dispersed mixture is obtained by means of sources of different elements, said mixture is coarsened to powder by pressing, and moulded product V is formed from said coarser powder by agglomeration; said products are divided into undamaged moulded products V+ and damaged moulded products V-, undamaged moulded products V+ are made into moulded products from catalyst K, and damaged moulded products V- are crushed and returned into production of highly dispersed mixture.

EFFECT: reduction of material loss in the process of catalyst production, improvement of working characteristics of catalyst.

5 tbl, 1 ex

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