Oxide catalyst

FIELD: chemistry.

SUBSTANCE: invention discloses an oxide catalyst for use in an olefin and/or alcohol oxidation reaction, a method of producing said catalyst and a method of producing a saturated aldehyde in the presence of said catalyst. The catalyst has the following formula (1): Mo12BiaFebCocCedAeBfOq (1), where Mo is molybdenum, Bi is bismuth, Fe is iron, Co is cobalt, Ce is cerium, A is at least one element selected from a group consisting of cerium and rubidium, B is at least one element selected from a group consisting of copper, nickel, magnesium and lead, a-f denote the atomic ratio of each of the elements to 12 Mo atoms; 2≤a≤6, 2.5<b≤5, 2≤c≤8, 0.4≤b/c≤2.5, 0.5≤d≤6, 0.01≤e≤2 and 0≤f<2, and g is the number of oxygen atoms, defined by the valence of the constituent element other than oxygen, wherein when the parameter d of a cerium and molybdenum composite oxide, which indicates a peak at 33.50° on an X-ray diffraction pattern, is taken as the reference, the level of change of d is 5000-9000 ppm. The method of producing the catalyst includes the following steps: ageing a suspension of the starting material containing molybdenum, bismuth, iron, cobalt and cerium at a temperature higher than room temperature; drying the aged suspension of the starting material; pre-calcining the dried product at 120°C or higher and 350°C or lower; and final calcining of the pre-calcined product at 400°C or higher and 700°C or lower.

EFFECT: oxide catalyst causes less formation of subsequent oxide in an olefin and/or alcohol oxidation reaction and can improve selectivity of unsaturated aldehyde.

3 cl, 2 dwg, 9 tbl, 23 ex

 



 

Same patents:

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

FIELD: chemistry.

SUBSTANCE: invention relates to a method of filling a longitudinal section of a contact pipe with a homogeneous part of a solid catalyst bed. The method of filling a longitudinal section of a contact pipe with a homogeneous part of a solid catalyst bed, the active mass of which is at least one multielement oxide which contains a) elements Mo, Fe and Bi, or, b) elements Mo and V, or c) element V, and additionally P and/or Sb, or the active mass of which contains elementary silver on an oxide support-article, and which consists of only one type Si, or a homogenised mixture of various types Si of catalytically active moulded articles of a defined geometrical shape or catalytically active moulded articles and inert moulded articles of a defined geometrical shape, wherein the median of the maximum longitudinal dimensions Lsi of the articles of a defined geometrical shape of type Si is characterised by the value Dsi, at least within one type Si of moulded articles of a defined geometrical shape, the following set of conditions M is satisfied, such that 40 to 70% of the total number of moulded articles of a defined geometrical shape belonging to S1, have a maximum longitudinal dimension Lsi, for which the inequality 0.98·Dsi≤Lsi≤1.02·DSi holds, at least 10% of the total number of moulded articles of a defined geometrical shape belonging to Si have a maximum longitudinal dimension Lsi, for which the inequality 0.94·Dsi≤Lsi<0.98·Dsi holds, at least 10% of the total number of moulded articles of a defined geometrical shape belonging to S1 have a maximum longitudinal dimension Lsi for which the inequality 1.02·Dsi<Lsi≤1.10·Dsi holds, less than 5% of the total number of moulded articles of a defined geometrical shape belonging to Si have a maximum longitudinal dimension Lsi for which the inequality 0.94·Dsi>Lsi holds, and less than 5% of the total number of moulded articles of a defined geometrical shape belonging to Si have a maximum longitudinal dimension Lsi for which the inequality 1.10·Dsi<Lsi holds, wherein the sum of all moulded articles of a defined geometrical shape belonging to Si is 100%; described also is a method of loading a contact pipe with a solid catalyst bed, a shell-and-tube reactor, a method for oxidation of an organic compound and a method for synthesis of separate organic compounds.

EFFECT: high selectivity of moulding the final synthesis product.

17 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 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: 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 an improved method for long-term heterogeneous catalytic partial gas-phase oxidation of an organic starting compound selected from propylene, isobutene, acrolein, methacrolein, propane or isobutane, to the desired organic compound, where the starting gaseous reaction mixture, containing the organic starting compound and molecular oxygen, is first passed through a freshly loaded sold catalyst layer which is filled with separation into two temperature zones A and B, lying in space one behind the other, temperature TA of which is such that the difference ΔTBA between temperature TB of zone B and temperature TA of zone A, which is calculated by taking the greater of the two values as the minuend, is greater than 0°C, such that the starting reaction mixture of gases successively flows through temperature zones A, B, first through A and then B, where temperature zone A extends until conversion of the organic starting compound UA = 15-85 mol %, and in temperature zone B conversion of the organic starting compound increases to a value UB ≥ 90 mol %, and as the operating life increases, temperature of zones A, B is changed in order to compensate for deterioration of quality of the solid catalyst layer, where as the duration of operation increases, temperature of that temperature zone which initially had a lower value, is raised, and the difference ΔTBA between temperature values of both zones is lowered, such that when calculating the difference, temperature of that zone which was initially the higher value, remains as the minuend.

EFFECT: compensating for the deterioration of quality of the solid catalyst layer with long operating life.

21 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method for heterogeneous catalytic gas-phase partial oxidation of at least one initial organic compound selected from propylene, isobutene, acrolein, methacrolein, propane or isobutane with molecular oxygen on a fixed catalyst bed freshly put into a reaction space, in which, for partial oxidation, a reaction gaseous mixture containing at least one initial organic compound and molecular oxygen is passed through the fixed catalyst bed, and reaction heat is removed via indirect heat exchange with a liquid heat carrier directed outside the reaction space, and as the quality of the fixed catalyst bed falls with operation time, not all, but part of the fixed catalyst bed is replaced with part of a replacement fixed catalyst bed in order to restore the quality of the fixed catalyst bed, where the specific volume activity of the replacement part of the fixed catalyst bed is lower than that of the replaced part of the fixed catalyst bed in its fresh state.

EFFECT: deterioration of the quality of the fixed catalyst bed with operation time is compensated for by replacing part of the fixed catalyst bed with a replacement part of the fixed catalyst bed, where the rate of deactivation of the catalyst is lowest in the disclosed method.

10 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: method involves: a) heterogeneously catalysed vapour-phase partial oxidation of a starting organic compound selected from propylene, propane, isobutylene, isobutane, acrolein or methacrolein with molecular oxygen in a parallel-functioning system of oxidation reactors containing catalysts, which results in formation of two gas streams respectively containing the desired compound and respectively formed in one of two systems of oxidation reactors, and b) subsequent extraction of the desired product from two streams of the obtained gas to form at least one stream of crude desired product according to which c) before extraction of two from two streams, the obtained gas is mixed with each other into a mixed stream. In case of change in selectivity of formation of the desired product and/or by-products during operation the entire amount or partial amount of catalyst is replaced in parallel with fresh catalyst not in all parallel-functioning systems of oxidation reactors in which end products contained in the mixed stream are formed.

EFFECT: improved method of obtaining acrolein, acrylic acid, methacrolein or methacrylic acid as the desired product.

2 cl, 4 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: according to the method: A) at least two initial gas streams containing propane, which form the reaction gas A, are fed into a reaction zone A, where one of said gas streams contains fresh propane; the reaction gas A is passed through at least one catalyst layer in reaction zone A in which partial heterogeneously catalysed dehydrogenation of propane results in formation of molecular hydrogen and propylene; molecular oxygen is fed into reaction zone A and oxidises molecular hydrogen in the reaction gas A to water vapour, and a gaseous product A is collected from reaction zone A, said product containing molecular hydrogen, water vapour, propylene and propane; B) the gaseous product A collected from the reaction zone A, while feeding molecular oxygen, is used in reaction zone B to supply at least one oxidation reactor with reaction gas B which contains molecular hydrogen, water vapour, propane, propylene and molecular oxygen, and propylene contained in reaction gas B undergoes two-step heterogeneously catalysed partial gas-phase oxidation in reaction zone B to obtain a gaseous product B containing acrylic acid as the end product, unconverted propane, molecular hydrogen, water vapour and carbon dioxide as by-products, as well as other secondary components with boiling point lower or higher the boiling point of water; C) gaseous product B is output from the reaction zone B and acrylic acid, water and secondary components with boiling point higher than that of water contained therein are separated in a first separation zone I through fractional condensation or absorption, wherein the residual gas I contains unconverted propane, carbon dioxide, molecular hydrogen, secondary components with boiling point lower than that of water, as well as, if necessary, propylene and molecular oxygen not converted in reaction zone B; D) residual gas I undergoes further treatment by washing carbon dioxide contained therein, separation of a partial amount of residual gas I, as well as, if necessary, separation of molecular hydrogen contained in the residual gas I using a separating membrane; E) after further treatment, unconverted propane-containing residual gas I is returned to reaction zone A as at least one of at least two propane-containing initial streams, where in reaction zone A, a certain amount (M) of molecular hydrogen is oxidised to water vapour, which makes up at least 35 mol % but not more than 65 mol % of the total amount of molecular hydrogen produced in reaction zone A and, if necessary, fed into said reaction zone A.

EFFECT: improved method of producing acrylic acid from propane.

22 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst composition for selective catalytic reduction of exhaust gas. The catalyst composition contains a vanadate of formula XVO4/S, where XVO4 denotes a vanadate of Bi, Sb, Ga and/or Al, optionally in a mixture with one or more vanadates of rare-earth metals, or in a mixture with one or more vanadates of transition metals, or in a mixture with one or more vanadates of transition metals and one or more vanadates of rare-earth metals, and S is a support which includes TiO2. A method of producing the catalyst composition is also disclosed.

EFFECT: improved heat resistance and improved NOx conversion activity of the supported catalyst composition.

13 cl, 1 dwg, 8 tbl, 7 ex

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