Method of obtaining an unsaturated aldehyde and/or unsaturated carboxylic acid

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of receipt of acrolein and acrylic acid or methacrolein and methacrylic acid, which effect on propylene or, at least, on one type of compounds selected from the group consisting of isobutylene tertiary butanol, as has a contact oxidation using gas containing molecular oxygen, using a fixed bed multitube reactor, where (A) provide many layers of catalyst formed by division of catalyst layer in layer N (N is an integer equal to or greater than 2) in the direction of flow of gaseous source materials in reaction tubes. And among segments of the catalyst layer of catalyst, which is located on the near side of the input reactive gas is defined as Zin, while catalyst layer located at the farthest outlet side reactive gas is defined as Zout, and (B) catalyst downloaded so that load into catalyst activity Zout, higher than loaded catalyst activity in Zin, and thus that is satisfied by the following equation (1): 0.5≤ (Cmax-Ccrs) (1), where Cmax is the degree of transformation of source materials in which the desired output product becomes maximum; Ccrs and represents the degree of transformation of raw materials where high/low ratio between the Tin and Tout changes to reverse when the maximum temperature layer of the catalyst Zin is defined as Tin, and the maximum temperature of the catalyst bed Zout is defined as Tout, and the conversion of the starting materials varies.

EFFECT: method enables stable work process over an extended period of time.

9 cl, 7 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of using gas-phase partial oxidation on a heterogeneous catalyst of acrolein into acrylic acid and methacrolein into methacrylic acid on a fixed catalyst bed lying in a shell-and-tube reactor in reaction tubes of a vertical bundle of reaction tubes enclosed in the reactor shell, when both ends of each of the reaction tubes are open and each reaction tube, through its top end, tightly enters a through-hole which is tightly built into the top part of the reactor shell of an upper tube sheet, and through its bottom end, tightly enters a through hole which is tightly built into the bottom part of the reactor shell of a lower tube sheet, wherein the outer surface of the reaction tubes, the upper and lower tube sheets, as well as the reactor shell together bound the space which surrounds the reaction tubes, wherein each of the two tube sheets is closed by a reactor cover having at least one hole, when in order to put into operation, a starting gaseous reaction mixture containing ≥3 vol. % acrolein or methacrolein and also molecular oxygen is fed into the reaction tubes of the shell-and-tube reactor through at least one hole, denoted hereafter as E, in one of the two reactor covers, and the gaseous product mixture containing acrylic acid or methacrylic acid, which is formed as a result of gas-phase partial oxidation of acrolein or methacrolein into acrylic acid or methacrylic acid by passing through a fixed catalyst bed lying in the reaction tubes, is removed through at least one hole in the other reactor cover, wherein at least one liquid heat carrier is fed from the side of the shell to the reaction tubes of the shell-and-tube reactor, the movement of the liquid heat carrier being such that each of the surfaces of both tube shells facing each other is covered by the liquid heat carrier, and wherein at least one liquid heat carrier enters the space surrounding the reaction tubes with temperature Twin and comes out of said space with temperature Twout. At the moment of use, the starting gaseous reaction mixture containing ≥3 vol. % acrolein or methacrolein is fed through at least one hole in the reactor cover, wherein temperature Twin of at least one liquid carrier which is in contact with the tube sheet closed by the reactor cover having at least one hole E, denoted hereinafter as reactor sheet E, is not lower than 290°C; the starting gaseous reaction mixture coming through at least one hole E has temperature ≤285°C and temperature of the surface of the reactor sheet E facing the reactor cover having at least one hole E, denoted hereinafter as the surface of reactor sheet E, is ≤285°C.

EFFECT: improved method.

16 cl, 4 dwg, 6 tbl, 3 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: invention relates to a method of conducting a continuous process of producing acrolein, acrylic acid or mixture thereof from propane in a stable operating mode, according to which: A) propane in a first reaction zone A undergoes heterogeneously catalysed dehydrogenation in the presence of molecular oxygen to obtain a gaseous mixture of products A containing propane and propylene, B) the gaseous mixture of products A, if needed, is fed into a first separation zone A in which a portion or more of components different from propane and propylene is separated therefrom and a gaseous mixture of products A' containing propane and propylene remaining after separation is obtained, C) the gaseous mixture of products A or gaseous mixture of products A' is fed into at least one oxidation reactor of the second reaction zone B, in which propylene contained therein undergoes partial selective heterogeneously catalysed gas-phase oxidation with molecular oxygen to obtain a gaseous mixture of products B, which contains acrolein, acrylic acid or mixture thereof as the desired product, unconverted propane, excess molecular oxygen and, if needed, unconverted propylene, D) in the second separation zone B, the desired product contained therein is separated from the gaseous mixture of products B, and at least a portion of the remaining gas containing propane, molecular oxygen and, if needed, unconverted propylene is returned to the reaction zone A as circulation gas 1 containing molecular oxygen, E) fresh propane is fed into at least one continuous flow process zone selected from a group comprising reaction zone A, separation zone A, reaction zone B and separation zone B, where the said fresh propane is fed at a rate characterised by a given stationary value when realising the process in a stable operating mode, and F) content of molecular oxygen in the gaseous mixture of products B is continuously determined and said value is compared with the desired stationary value needed to realise the process in stable operating mode, characterised by that if at a certain moment in time, content of molecular oxygen in the gaseous mixture of products B exceeds the given desired stationary value, fresh propane is fed into the process right away at feed rate higher than its stationary value, and if at a certain moment in time, content of molecular oxygen in the gaseous mixture of products B is lower than the corresponding given desired stationary value, fresh propane is fed into the process right away at feed rate lower than its stationary value.

EFFECT: used of present method reduces heat loss and prevents a drop in degree of dehydrogenation when producing acrolein, acrylic acid or mixture thereof from propane.

13 cl, 2 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: according to method A) an input stream of the reaction gaseous mixture A is fed into the input of the first reaction zone A, where the input stream is obtained by merging at least four different gaseous initial streams 1, 2, 3 and 4, where the gaseous initial streams 1 and 2 contain propane, gaseous initial stream 4 is molecular hydrogen and gaseous initial stream 3 is fresh propane, the input stream of the reaction gaseous mixture A is passed at least through one catalyst layer of the first reaction zone A on which, if needed, when feeding other gaseous streams, as a result of heterogeneous catalytic partial dehydrogenation of propane, a stream of products of gaseous mixture A forms, which contains propane and propylene, the stream of products of gaseous mixture A comes out of the first reaction zone A through the corresponding outlet, while splitting said stream into two partial streams 1 and 2 of products of the gaseous mixture A with identical composition, and the partial stream 1 of products of the gaseous mixture A is returned to the first reaction zone A as the gaseous initial stream 1, the partial stream 2 of products of the gaseous mixture A, if needed, is directed to the first separation zone A, in which a portion or more of components contained therein, which are different from propane and propylene, are separated, as a result of which a stream of products of gaseous mixture A' which contains propane and propylene, B) partial stream 2 of products of the gaseous mixture A or a stream of products of gaseous mixture A' is used in a second reaction zone B for supplying at least one oxidation reactor, in which propylene contained in the partial stream 2 of products of gaseous mixture A or in the stream of products of gaseous mixture A' undergoes selective heterogeneously catalysed partial gas-phase oxidation with molecular oxygen to obtain a stream of products of a gaseous mixture B, which contains acrolein, acrylic acid or mixture thereof as the desired product, unconverted propane and, if needed, unconverted propylene, as well as molecular oxygen, the stream of products of gaseous mixture B comes out of reaction zone B, the desired product contained in separation zone B is separated in said separation zone B and at least a portion of residual gas formed after separation and containing unconverted propane, molecular oxygen and, if needed, unconverted propylene, is returned to reaction zone A as gaseous initial stream 2. Gaseous initial streams 2, 3 and 4 as well as, if needed, additional gaseous initial streams different from the gaseous initial stream 1, are merged into a gaseous stream of the working mixture, after which, using this gaseous stream of the working mixture as the working stream, a jet pump is activated, said pump having a nozzle, a mixing section, a diffuser and a suction inlet. Movement of the working stream which is throttled through the nozzle, the mixing section and the diffuser to the input of the first reaction zone A, as well as the suction effect of the suction inlet takes place in the direction of outlet of the stream of products of gaseous mixture A from the first reaction zone A. The pressure drop created in the suction nozzle with splitting of the stream of products of the gaseous mixture A into two partial streams 1 and 2 results in suction of the partial stream 1 of products of the gaseous mixture A, its movement through the diffuser with simultaneous mixture with the working stream on the mixing section and inlet of the formed reaction stream of gaseous mixture A at its inlet point into the first reaction zone A, characterised by that a gaseous initial mixed stream is formed first by merging in random sequence gaseous initial streams 2 and 3, as well as, if needed, additional gaseous initial streams different from gaseous initial streams 1 and 4, and only after that the gaseous initial stream 4 is added to the formed gaseous initial mixed stream to obtain a gaseous mixed working stream.

EFFECT: used of present method reduces heat loss and prevents a drop in degree of dehydrogenation when producing acrolein, acrylic acid or mixture thereof from propane.

7 cl, 4 ex, 4 dwg

FIELD: chemistry.

SUBSTANCE: initial mixture 2 of the reaction gas which contains propylene and molecular oxygen, as well as molecular nitrogen and propane as inert gases - diluents, in which molar ratio of molecular oxygen to propylene O2:C3H6≥1, at high temperature is passed through a fixed catalyst bed, the active mass of which is at least one polymetallic oxide containing Mo, Fe and Bi, in which the initial mixture 2 of the reaction gas, per total volume, contains 7-9 vol. % propylene, 9.8-15.5 vol. % molecular oxygen, 10.5-15.5 vol. % propane and 40-60 vol. % molecular nitrogen, provided that the molar ratio V1 of propane contained in the initial mixture 2 of the reaction gas to propylene contained in the initial mixture 2 of the reaction gas is between 1.5 and 2.2, molar ratio V2 of molecular nitrogen contained in the initial mixture 2 of the reaction gas to molecular oxygen contained in the initial mixture 2 of the reaction gas is between 3.5 and 4.5, and molar ratio V3 of molecular oxygen contained in the initial mixture 2 of the reaction gas to propylene contained in the initial mixture 2 of the reaction gas is between 1.4 and 2.14.

EFFECT: improved method of lowering flash point temperature of a fixed catalyst bed during synthesis of acrolein or acrylic acid or mixture thereof through heterogeneously catalysed gas-phase partial oxidation of propene.

27 cl, 1 dwg, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of lowering the flash point temperature of a fixed catalyst bed during synthesis of acrylic acid through heterogeneously catalysed gas-phase partial oxidation of propylene, in which a) at the first reaction step, propane undergoes heterogeneously catalysed dehydrogenation to obtain a product gas mixture 1, b) a partial amount of components in the formed product mixture 1 which are different from propane and propylene are converted to other compounds if needed and if needed a partial amount of components of the product gas mixture 1 formed at the first reaction step which are different from propane and propylene are separated, wherein a product gas mixture 1', which contains propane and propylene, as well as compounds different from oxygen, propane and propylene, is obtained from the product gas mixture 1, and c) as a component of the initial reaction gas mixture 2 at the second reaction step, the product gas mixture 1 or 1' undergoes heterogeneously catalysed partial oxidation in the gas phase of propylene contained in the product gas mixture 1 or 1' to acrolein, where the product gas mixture 2 is obtained, and d) temperature of the product gas mixture leaving the second reaction step, if needed, is lowered through direct and/or indirect cooling and molecular oxygen and/or inert gas is added to the said mixture 2 if needed, and e) further, as an initial reaction gas mixture 3 at the third reaction step, acrolein contained in the initial reaction gas mixture 3 undergoes heterogeneously catalysed gas-phase partial oxidation to acrylic acid, where the product gas mixture 3 is obtained, and f) acrylic acid and at least unreacted propane and propylene contained in the product gas mixture 3 are separated from the product gas mixture 3 in a separation zone A an then returned to at least the first of three reaction steps, where i) the second reaction step is carried out until achieving propylene degree of conversion Up ≤99 mol % for one-time passage through the zone, and ii) the third reaction step is carried out until achieving acrolein degree of conversion UA ≥96 mol % for one-time passage through the zone. The method involves at least one separate selection for components different from propane and propylene, which contains propane and propylene in amount ≤5 vol %.

EFFECT: low temperature.

39 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing acrylic acid from propylene, involving a first step where propylene is oxidised to acrolein and a second step where acrolein is oxidised to acrylic acid, as well as a step for dehydrating glycerin to acrolein in the presence of a propylene-containing gas. The said step for dehydrating glycerin is carried out before catalytic oxidation of propylene to acrolein in the presence of the supplied propylene-containing gas, or after catalytic oxidation of propylene to acrolein in the presence of a gaseous mixture coming out after oxidation of propylene to acrolein.

EFFECT: method enables partial use of renewable material, while increasing output of acrylic acid.

8 cl, 5 dwg, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of oxidation of hydrocarbons, in particular, saturated hydrocarbons, to obtain peroxides, alcohols, ketones, aldehydes and/or diacids. In particular, claimed is a method of oxidation of saturated hydrocarbon with molecular oxygen, which includes processing output gaseous products by the claimed method of oxidation. The said processing includes a stage of combination of output gas flows to be processed with oil in a liquid state to absorb saturated hydrocarbon, contained in these flows, and the second stage of processing oil, filled with hydrocarbons, by stripping (distillation) with water steam to extract hydrocarbon, condensate collected steam and separate hydrocarbon by decantation.

EFFECT: method makes it possible to economically and selectively extract saturated hydrocarbon, present in output gases, to make its return into the oxidation process possible.

7 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of obtaining higher fatty chlorinated acids of general formula R(CHCl)nCOOH, where R is an aliphatic hydrocarbon radical, which contains 9-22 carbon atoms; n=1-4, by oxidation of chloroparaffins in the presence of a catalyst, which is mixed with chloroparaffins in the presence of air oxygen at a temperature of 120-125°C, and oxidation is carried out by air oxygen at a temperature of 105-110°C and atmospheric pressure for 30 h, characterised by the fact, that as the catalyst applied is a catalytic system, which consists of cobalt stearate and potassium stearate with the molar ratio of 1:0.5÷1.

EFFECT: possibility of obtaining higher fatty chlorinated acids of wide assortment, an increased rate of a reaction course and reduction of cobalt stearate quantity, partially replaced with potassium stearate.

1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method and a mixture for oxidising an alkyl aromatic compound. The mixture contains: an alkyl aromatic compound, a solvent, a bromine source, a catalyst and ammonium acetate; wherein the solvent includes a carboxylic acid having 1-7 carbon atoms and optionally water, and the catalyst substantially consists of at least one metal selected from cobalt, titanium, manganese, chromium, copper, nickel, vanadium, iron, molybdenum, tin, cerium and zirconium, present in form of acetates or hydrates thereof.

EFFECT: present invention enables to obtain products of higher purity which enables to eliminate or minimise purification costs.

10 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining aqueous acrylic acid from flow of gaseous material, which includes the following stages: a) supply of gaseous flow into condenser, where flow of gaseous material includes at least acrylic acid, water and formaldehyde; and b) operation of condenser and obtaining gaseous output flow, which includes non-condensed components released from the upper part of condenser, and condensed flow of aqueous acrylic acid, including acrylic acid, which is discharged from condenser mud-box, where flow of aqueous acrylic acid includes not more than 0.1 wt % of formaldehyde in terms of total weight of flow of aqueous acrylic acid. Flow, which contains (met)acrylic acid can represent flow of raw product of catalytic oxidation of at least one C2-C4-alkane or -alkene.

EFFECT: method is characterised by high concentration of (met)acrylic acid and lower concentration of formaldehyde, ie not higher than 0,1 wt %, than in aqueous (met)acrylic acid, obtained by application of separation methods known before.

8 cl, 1 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing pure methacrylic acid, which involves: a) gas-phase oxidation of a C4 compound to obtain a methacrylic acid-containing gas phase, b) condensing the methacrylic acid-containing gas phase to obtain an aqueous methacrylic acid solution, c) separating at least a portion of the methacrylic acid from the aqueous methacrylic acid solution to obtain at least one methacrylic acid-containing raw product, d) separating at least a portion of methacrylic acid from the at least one methacrylic acid-containing raw product by thermal separation to obtain pure methacrylic acid, wherein at step (d), methacrylic acid is separated from at least a portion of at least one methacrylic acid-containing raw product by fractionation, and wherein the pure methacrylic acid is collected through a side outlet used for the fractionation column, and the amount of pure methacrylic acid collected over a certain time interval ranges from 40% to 80% of the amount of the methacrylic acid-containing raw product fed into the fractionation column over the same time interval. The invention also relates to an apparatus for producing methacrylic acid using said method, the apparatus comprising: a1) a gas-phase oxidation unit, b1) an absorption unit, c1) a separation unit, and d1) a purification unit, wherein the purification unit has at least one distillation column, wherein the at least one distillation column has at least one side outlet for pure methacrylic acid. The invention also relates to a method of producing methacrylic esters, polymethacrylate, polymethacrylic esters, which includes a step for said production of pure methacrylic acid.

EFFECT: obtaining an end product with fewer by-products while simplifying the process.

32 cl, 3 tbl, 4 dwg, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method for oxidative ammonolysis of a saturated hydrocarbon to obtain an unsaturated nitrile. The method involves preparing a catalytic mixture containing freshly prepared mixed metal oxide catalyst, a spent mixed metal oxide catalyst and an activity modifier, and contacting the saturated hydrocarbon with an oxygen-containing gas and ammonia in the presence of the catalytic mixture. The freshly prepared and spent mixed metal oxide catalysts contain molybdneum, vanadium, niobium and at least one element selected from antimony and tellurium, and optionally contain at least one element selected from lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, tungsten, titanium, tin, germanium, zirconium, lithium and hafnium. The catalysts can optionally contain a support selected from oxides of silicon, aluminium, zirconium, titanium or mixtures thereof. The activity modifier is selected from antimony (III) oxide, antimony (III) oxalate, antimony (III) tartrate, antimony (V) oxide, antimony tetroxide, Sb6O13 and mixtures thereof. The invention also relates to a method for oxidative ammonolysis, which involves mechanical mixing of a dry mixed metal oxide catalyst and an activity modifier to form a catalytic mixture and contacting a saturated hydrocarbon with an oxygen-containing gas and ammonia in the presence of said mixture.

EFFECT: disclosed methods increase output of the end product.

13 cl, 3 tbl, 4 ex

FIELD: process engineering.

SUBSTANCE: this invention relates to production of aldehydes and, at appropriate conditions, of acids. Proposed method comprises catalytic oxidation of alkanes or mixed thereof by air or oxygen, if necessary, in the presence of inert gases, steam or reaction offgas at higher temperatures using oxide catalyst.

EFFECT: higher yield of, primarily, acrolein or mix of acrolein and acrylic acid.

4 cl, 11 ex

FIELD: chemistry.

SUBSTANCE: claimed invention discloses catalytic compositions, which contain mixed metal oxides, which demonstrate activity in propane or isobutene conversion into unsaturated nitryl by ammoxidation in presence of ammonia and oxygen source. Composition includes one or more crystalline phases, at least, one of which is first phase, characterised by crystalline structure MI and including mixed metal oxide, which contains molybdenum (Mo), vanadium (V), antimony (Sb) and niobium (Nb). First phase has volume of elementary cell, which lies within the range towards increase from 2255 A3 to 2290 A3, first dimension of crystal and transverse to it second dimension, on condition that ratio of first dimension to second dimension is within the range towards reduction from 1.75 to 1.0 (aspect ratio). In particular, mixed oxide material isd represented by empirical formula MoVaSbbNbcOδ; where 0.1<a<1.0, 0.01<b<1.0, 0.001<c<0.25, and δ represents number of oxygen atoms, which are required for preservation of electric neutrality of other present constituting elements. Also described is method of ammoxidation in presence of ammonia and oxygen source by means of said disperse hard catalyst.

EFFECT: ensuring high output.

11 cl, 1 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: conducting heterogeneously catalysed gas-phase partial oxidation of at least one corresponding starting compound with three carbon atoms on catalysts in a solid aggregative state at high temperature with molecular oxygen enables to obtain a gaseous mixture of products containing acrylic acid, water vapour and secondary components; if necessary, temperature of said mixture is lowered by direct and/or indirect cooling, after which said mixture is fed into a condensation column equipped with efficiently separating elements, wherein said mixture rises by itself along said column with simultaneous flow of fractional condensation. Through a first side outlet, which lies above the point of feeding the gaseous mixture of reaction products into the condensation column, crude acrylic acid poor in water and secondary components is output from the condensation column as the end product; through a second liquid phase outlet lying above the first side outlet, acid water containing acrylic acid and secondary components is output from the condensation column; a residual gaseous mixture containing secondary components which boil at a lower temperature than water is output from the top part of the condensation column; still liquor which contains acrylic acid, as well as byproducts and secondary components which boil at higher temperature than acrylic acid are output the bottom of the condensation column; part of the amount of the collected acid water as it is and/or after cooling is returned into the condensation column as reflux, and crude acrylic acid is optionally subjected to additional treatment using at least another thermal separation method, and, if necessary, part of the amount of collected acid water is added to acrylic acid before additional crystallisation treatment, where acrylic acid contained in at least part of the amount acid water which is not returned into the condensation column is transferred from the acid water to an organic solvent through extraction carried out by said solvent, which is accompanied by formation of an organic extract containing acrylic acid, from which acrylic acid is further separated by stripping thereof with a first stripping gas, wherein the first stripping gas containing acrylic acid is returned into the condensation column, and/or acrylic acid contained in the first stripping gas is transferred into an aqueous solution of a metal hydroxide or the formed first stripping gas which contains acrylic acid is used as a second stripping gas in order to strip acrylic acid contained in the still liquor output from the condensation column, and wherein the formed second stripping gas containing acrylic acid is returned into the condensation column and/or acrylic acid contained in the second stripping gas is transferred into an aqueous solution of a metal hydroxide.

EFFECT: improved method.

21 cl, 6 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 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

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