The method of obtaining unsaturated nitrile

 

(57) Abstract:

The invention relates to improved sposobu, allowing virtually eliminate the formation of nitride in the supply piping in the reactor with a fluidized bed of catalyst used in the production of unsaturated NITRILES from the corresponding olefins, NH3and oxygen, according to the way the temperature of the ammonia inside the pipeline is maintained at a level below the temperature of dissociation and/or the temperature of the internal surface of the pipeline is maintained at a level below the temperature at which any monatomic nitrogen can interact with the pipeline for the formation of nitride. 2 S. and 9 C.p. f-crystals, 3 ill.

The invention relates to an improved process for the preparation of unsaturated NITRILES from the corresponding unsaturated olefins by reaction of ammonia, oxygen and unsaturated olefin in the reactor with a fluidized bed of catalyst. In particular the invention relates to an improved method of producing Acrylonitrile by reaction of ammonia, propylene and oxygen in the reactor with a fluidized bed.

Direct ammoxidation of unsaturated about the LASS="ptx2">

In particular the production of Acrylonitrile by reaction of ammonia, propylene and oxygen with the use of a fluidized bed reactor the catalyst is widely used on an industrial scale. This method was developed and implemented by the patentees of the present invention and is universally called "Acrylonitrile way Sohio".

This method is carried out in a reactor with a fluidized bed, in which the reactants pass upward through the corresponding catalyst, and the products and unreacted starting materials are removed from the upper part of the reactor.

The catalyst used in this method, fully described in several U.S. patents, such as 3 642 930, 4 863 891, and 4 767 878 referred to here for details.

The disadvantage of this method of Sohio is that in the process of introducing ammonia into the reactor with a fluidized bed is nitrotyrosine used feed lines.

It is noticed that over time the pipes ammonia in a reactor with a fluidized bed, are nitrotyrosine (interact monatomic nitrogen with the metal surface of the feed pipe / bubbler), who headed the remainder of the leads to the need for regular replacement of pipes/bubblers, however, in order to maintain the unit in working condition.

For a number of years have proposed various solutions to this problem nitrotyrosine associated with the way Sohio, including the replacement of metal pipes/bubblers pipes made of special materials not subject to nitrotyrosine.

However, these solutions did not succeed due to the fact that there were new difficulties associated with the use of nitride sustainable materials in the environment of the reactor fluidized bed in the Acrylonitrile process, and with the high cost of such materials.

The problem of nitrotyrosine metals in other environments have been known for many years, as evidenced by the patents 3704690, 4401153, 5110584 and Europatent 0113524. Each of these patents is intended to solve the problem of nitrotyrosine through the use of resistant nitrotyrosine alloys.

The invention aims to solve the problem of nitrotyrosine associated with the method of Sohio, without the use of a material resistant to nitrotyrosine.

The main objective of the invention is the creation of an improved method for the production of Acrylonitrile, which will allow C what s the specified task and other tasks derived from the goals of the invention, the method according to the invention includes the introduction of gaseous propylene, ammonia and oxygen in a reactor with a fluidized bed through at least one conduit for interaction in the presence of a fluidized catalyst to obtain Acrylonitrile, and differs in that to improve the process the temperature of the vapor of ammonia inside the pipeline is maintained at a level below the temperature of dissociation of ammonium.

In accordance with an additional aspect of the invention, described in detail in these materials, the method according to the invention includes a method of producing Acrylonitrile comprising introducing a gaseous propylene, ammonia and oxygen in a reactor with a fluidized bed through at least one conduit for interaction in the presence of a fluidized catalyst to obtain Acrylonitrile, characterized in that to improve the process the temperature of the internal surface of the pipeline in contact with the ammonia gas is maintained at a level below the temperature at which dissociatively nitrogen can react with the pipeline to the formation of nitrides.

In a preferred embodiment, voploshenija ammonia, as the temperature of the internal surface of the pipeline is maintained at a level below the temperature at which any dissociatively nitrogen can react with the pipeline to the formation of nitrides.

In another preferred variant of embodiment of the invention the supply pipe includes a bubbler.

In yet another variant embodiment of the invention bubbler includes a collector pipe (main pipe) connected to the lateral pipe with many holes.

In another preferred variant of embodiment of the invention the temperature of the internal surface of the pipeline is maintained at a level below the temperature at which may occur nitrotyrosine by creating a protective insulating coating around the outer surface of the pipeline.

In yet another variant embodiment of the invention around the outer surface of the insulation has a second pipeline to create abrasion resistant layer to protect the insulation.

The value of the method according to the invention is that it is simple and economical way to prevent nitrotyrosine the surface of the feed lines to the reactor pig pipelines or bubblers, used in the fluidized bed reactor for the production of Acrylonitrile worth for many years.

Previous attempts to solve the problem of nitrotyrosine focused on the use of various materials such as, for example, "Inconel", which do not form nitrides with dissociatively nitrogen. However, the application of these complex alloys has not given satisfactory results.

The invention is based on the concept that, in order to place nitrotyrosine, you need to meet two conditions: first, the ammonia should be at a temperature above the temperature at which it dissociated (formation of monatomic nitrogen and hydrogen); secondly, the temperature of the inner surface of the pipe or bubbler, which delivers the ammonia in the reactor should be equal to the temperature at which the reaction occurs nitrotyrosine.

Found that the temperature of the ammonia inside the pipe or bubbler to the exit in the reactor and in contact with a fluidized bed of the catalyst can be maintained below the temperature of dissociation of ammonia without prejudice to the Acrylonitrile process.

In addition discovered that it is possible podemos to nitrotyrosine, by a relatively simple method, which does not lead to a strong appreciation of the process.

Each of these methods can be used separately in order to virtually remove problems nitrotyrosine in the production of Acrylonitrile. In a preferred variant embodiment of the invention both methods are used simultaneously, thus eliminating the need for replacement of pipelines or bubblers after a certain period of time. This allows you to achieve significant savings in the production of Acrylonitrile by way of Sohio.

In Fig. 1 shows a reactor with a fluidized bed, an incision from the top of Fig. 2 is a reactor with a fluidized bed in the cut line a-a of Fig. 1; Fig. 3 is a reactor with a fluidized bed in broken lines In Fig. 1.

The method according to the invention includes a method of producing Acrylonitrile comprising introducing a gaseous propylene, ammonia and oxygen in a reactor with a fluidized bed through at least one conduit for interaction in the presence of a fluidized catalyst to obtain Acrylonitrile, characterized in that to improve the way the temperature of the gaseous ammonia inside a pipeline PLO 150oC.

Another aspect of the invention is that the method of producing Acrylonitrile includes the introduction of gaseous propylene, ammonia and oxygen in a reactor with a fluidized bed through at least one conduit for interaction in the presence of a fluidized catalyst to obtain Acrylonitrile, characterized in that to improve the process the temperature of the internal surface of the pipeline through which the ammonia is fed into the reactor is maintained at a level below the temperature at which any dissociatively nitrogen can react with the surface of the pipeline for the formation of nitrides.

To start the formation of nitrides, metal temperature must be above 350oC.

The following is a detailed description of the method according to the invention.

In Fig. 1 shows a conventional bubbler for Acrylonitrile reactor section. Collector 2 usually consists of a metal pipe of large diameter, which is included in the reactor 1 and through which is made the supply of ammonia and propylene in the reactor. Lateral pipes 3 are metal pipe mean diameter, the exhaust from the manifold 2. Nozzle 4 usually consist of holes 10 and cctor 1.

In Fig. 2 and 3 illustrate the preferred embodiment of the invention.

It is shown in Fig. 2 collector 2 (with reference to Fig. 1) contains the first pipe 5, having a second pipe 6, is placed inside the pipe 5 at a certain distance from the latter. The pipes 5 and 6 are closed at one end. The space between the tubing 5 and 6 is filled with insulation 7, which allows to maintain the temperature of the internal surface of pipelines 6 below the temperature required for the metal pipe 6 reacts with any monatomic nitrogen that is present inside the pipe 6 for the formation of nitride.

In Fig. 3 lateral pipe 3 (shown in Fig. 1) also contain the first line 8 and the second pipe 9 and the pipe 9 is located inside the pipe 8 at a certain distance from the latter. The pipes 8 and 9 is similar to the pipes 5 and 6 are closed at one end and the space between the pipes 8 and 9 is filled with insulation 7 as described above.

Holes 10 are of conventional design that provides a uniform flow of ammonia and propylene around the reactor fluidized bed 1. In the preferred options is on, to direct the flow downward in a fluidized bed.

Case Acrylonitrile reactor made of conventional metal alloys known in this field. Usually the design of the feed bubblers (pipelines) includes 40 and 80 seamless pipe made of carbon or low-chromium steel.

In another variant embodiment of the invention the cap may be made of resistant nitrotyrosine material, such as Inconel", "alonsomania carbon steel", "alonsomania low-chromium steel, etc.

Most preferred is "Inconel". These materials can be used for the manufacture of caps because the caps are a very small portion of the bubbler, and the cost of construction will be insignificant.

In the manufacture of Acrylonitrile ammonia and propylene are fed through the collector 2 in the lateral pipe 3 for dispersion through the nozzle 4 in the reactor 1. The oxygen of the air pump in the bottom part of the reactor 1 by conventional means (not shown).

Temperature, the ratio of propylene, ammonia and feed rate are normal for this method is shown in U.S. patent No. 4 801 731 referred to here for details.

Those who Miaka. Accordingly, the ammonia should not be and preferably will not dissociate into monatomic nitrogen and hydrogen, allowing virtually eliminated, preferably completely eliminated, the possibility of nitrotyrosine on the inner surface of the pipeline 6 collector 2 and on the inner surface of the pipeline 9 lateral pipes 3.

In addition, the temperature of the inner surface of the pipes 6 and 9 support level is lower than the temperature that is required to free nitrogen interacted with the metal surface of the pipes 6 and 9 for the formation of nitride.

To enable this, the pipes 6 and 9 are covered with the insulation layer 7, and then around the pipes 6 and 9 create second pipes 5 and 8, respectively, to protect the insulation from 7 abrasive wear of its surface under the action of the fluidized bed of catalyst.

The above description of the preferred variant embodiment of the invention given as illustrations. The scope of the invention are not limited to those disclosed above option, the concept of the invention involves various modifications and variations.

The above variant embodiment of the invention has been selected and apiculate in this area could make full use of these principles in different variants and modifications, corresponding to the specific production conditions.

The scope of the invention defined by the claims presented below.

1. The method of obtaining unsaturated nitrile from the corresponding unsaturated olefin, including the introduction of a gaseous olefin, ammonia and oxygen in a reactor with a fluidized bed through at least one conduit for interaction in the presence of a fluidized catalyst to obtain the corresponding nitrile, characterized in that the temperature of the vapor of ammonia inside a pipeline support below the temperature of dissociation of the ammonia.

2. The method according to p. 1, characterized in that additionally the temperature of the internal surface of the pipeline in contact with ammonia, a support below the temperature at which nitrogen can interact with the pipeline for the formation of nitride.

3. The method according to p. 1, wherein the feed line includes a bubbler comprising at least one collector pipe connected to at least one lateral pipe containing at least one nozzle.

4. The method according to p. 3, wherein the nozzle further comprises at least one hole and Octo pair ammonium inside a pipeline support at a temperature below the temperature of dissociation of ammonia through the protective insulating coating around the outer surface of the pipeline.

6. The method according to p. 5, characterized in that around the outer surface of the insulation generate a second pipeline, to provide a protective surface for the insulation.

7. The method according to p. 2, characterized in that the inner surface of the pipeline support at a temperature below the temperature at which any dissociatively nitrogen can interact with the pipeline, through a protective insulating coating around the outer surface of the pipeline.

8. The method according to p. 7, characterized in that around the outer surface of the insulation generate a second pipeline, to provide a protective surface for the insulation.

9. The method of obtaining unsaturated nitrile from the corresponding unsaturated olefin, including the introduction of a gaseous olefin, ammonia and oxygen in a reactor with a fluidized bed through at least one conduit for interaction in the presence of a fluidized catalyst to obtain the corresponding nitrile, characterized in that the temperature of the internal surface of the pipeline in contact with gaseous ammonia, is supported below the temperature at which any dissociatively nitrogen can maintains the indoor surface of the pipeline support at a temperature below the temperature when any dissociatively nitrogen can interact with the pipeline by creating a protective insulating coating around the outer surface of the pipeline.

11. The method according to p. 10, characterized in that around the outer surface of the insulation generate a second pipeline to provide a protective surface for insulation.

 

Same patents:

The invention relates to a method for the catalytic vapor-phase ammoxidation3-C5olefins to obtain,- unsaturated mononitriles and HCN, and more precisely, the invention relates to a method for the catalytic vapor-phase ammoxidation (1) of propylene to obtain Acrylonitrile and HCN and (2) of isobutylene to obtain Methacrylonitrile and HCN

The invention relates to an improved method and catalyst of oxidative ammonolysis of mixtures of olefin ammonia in unsaturated NITRILES and, in particular, relates to an improved method and catalyst of oxidative ammonolysis of mixtures of propylene with ammonia and isobutene ammonia to Acrylonitrile and Methacrylonitrile respectively

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FIELD: industrial organic synthesis.

SUBSTANCE: process, in which, in particular, acrylonitrile or methacrylonitrile are obtained, comprises reacting hydrocarbon selected from propane, propylene, and isobutylene with ammonia and oxygen source in presence of catalyst in reaction zone at elevated temperature. Reactor effluent containing unsaturated mononitrile is transferred into first column to be cooled therein with the aid of the first water stream. Cooled effluent containing unsaturated mononitrile is transferred into second column wherein it comes into contact with second water stream to absorb unsaturated mononitrile. Unsaturated mononitrile-containing second column effluent is fed into first distillation column to separate crude unsaturated mononitrile from the second water stream and routed to the second distillation column to remove at least some impurities from crude mononitrile, which is transferred into third distillation column to be further purified. Water in the form of steam and/or distilled water is added in amounts 100 to 2000 ppm to side-cut distillate containing purified mononitrile or to bottom stream coming out of the third distillation column. At least part of the latter is recycled into lower section of third distillation column or directly into column below side-cut distillate withdrawal point.

EFFECT: enhanced process efficiency.

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FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to methods (variants) for producing acrylonitrile and preparing hydrogen cyanide and acetonitrile as co-products. Methods involve addition of hydrocarbon that is taken among propylene or propane, ammonia and oxygen-containing gas to the reaction zone containing a catalyst for oxidative ammonolysis and reaction is carried out at increased temperature to form acrylonitrile, hydrogen cyanide and acetonitrile, and isolation of acrylonitrile, hydrogen cyanide and acetonitrile from reactor also. According to the first variant reaction is carried out in the presence of alcohols mixture containing methanol and a second alcohol among ethanol, propanol or their mixtures wherein the weight ratio of methanol to the second alcohol in alcohols mixture is maintained depending on necessary amounts of hydrogen cyanide and acetonitrile. According to the second variant reaction is carried out in the presence of alcohols mixture containing methanol and ethanol taken in the weight ratio from about 99:1 to 1::99. According to the third variant reaction is carried out in the presence of one or more alcohols taken among crude methanol, crude ethanol or crude propanol. According to the fourth variant reaction is carried out in the presence of one or more crude (C1-C4)-alcohol. Proposed method provides enhancing yield of one or both co-products, i. e. HCN and acetonitrile, formed in producing acrylonitrile.

EFFECT: improved producing method.

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FIELD: chemical technology.

SUBSTANCE: invention relates to a method for reducing breakthrough fraction of ammonia in the process for manufacturing acrylonitrile. Method involves addition of hydrocarbon taken among the group consisting of propane and isobutene, ammonium and oxygen-containing gas to the bottom reactor compartment with fluidized bed and containing a catalyst for ammoxidation followed by interaction in the presence of indicated catalyst to form acrylonitrile. Method involves addition into reactor in the point lower by flow from feeding alkane of at least one among from C2- to C5-olefins that reacts with at least part of unreacted ammonia and oxygen presenting in the reactor that allows to carry out the significant reducing the ammonia amount presenting in the reaction flow coming out from the reactor. Except for, invention relates to a method for conversion of acrylonitrile manufacture based on propylene raw wherein propylene, ammonia and oxygen react in reactor in the presence the catalyst used in acrylonitrile manufacturing to the process of acrylonitrile manufacturing based on propane raw wherein propane, ammonia and oxygen reacts in the presence of catalyst used in preparing acrylonitrile. Method involves the following stages: (a) replacing the parent propylene-base raw with the propane-base parent raw; (b) addition into reactor in the point lower by flow from feeding alkane of at least one among from C2- to C5-olefin that reacts with at least part of unreacted ammonia and oxygen presenting in the reactor that results to reducing the amount of ammonia presenting in the reaction flow coming out from the reactor, and (c) addition agents for separation, trapping and recycling of unreacted propane to the process.

EFFECT: improved manufacturing method.

13 cl, 19 ex

FIELD: petrochemical process catalysts.

SUBSTANCE: invention is dealing with catalyst applicable in saturated hydrocarbon ammoxidation process resulting in corresponding unsaturated nitrile. Catalyst composition of invention comprises complex of catalytic oxides of iron, bismuth, molybdenum, cobalt, cerium, antimony, at least one of nickel and magnesium, and at least one of lithium, sodium, potassium, rubidium, and thallium and is described by following empirical formula: AaBbCcFedBieCofCegSbhMomOx, wherein A represents at least one of Cr, P, Sn, Te, B, Ge, Zn, In, Mn, Ca, W, and mixtures thereof; B represents at least one of Li, Na, K, Rb, Cs, Ti, and mixtures thereof; C represents at least one of Ni, Mg, and mixtures thereof; a varies from 0 to 4.0, b from 0.01 to 1.5, c from 1.0 to 10.0, d from 0.1 to 5.0, e from 0.1 to 2.0, f from 0.1 to 10.0, g from 0.1 to 2.0, h from 0.1 to 2.0, m from 12.0 to 18.0, and m is a number determined by requirements of valences of other elements present. Ammoxidation processes for propylene, ethylene, or their mixtures to produce, respectively, acrylonitrile, methacrylonitrile, or their mixtures in presence of above-defined catalytic composition is likewise described.

EFFECT: increased olefin conversion.

9 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: proposed catalyst contains a complex of catalytically active oxides, including oxides of rubidium, cerium, chrome, magnesium, iron, bismuth, molylbdenum and at least, one of nickel or nickel with cobalt. The ratio of components is presented by the following general formula: RbaCebCrcMgdAeFefBigMo12Ox, where A is Ni or a combination of Ni and Co, a approximately ranges from 0.01 to 1, b approximately ranges from 0.01 to 3, c approximately ranges from 0.01 to 2, d approximately ranges from 0.01 to 7, e approximately ranges from 0.01 to 10, f approximately ranges from 0.01 to 4, g approximately ranges from 0.01 to 4, and x is a number, defined by valency of other present elements. "b"+"c" is greater than g. The catalyst does not contain manganese, noble metal or vanadium. The carrier is chosen from a group comprising silica gel, aluminium oxide, zirconium oxide, titanium oxide or their mixture. The catalyst is used for oxidative ammonolysis of olefin, chosen from a group containing isobutylene or their mixture, with formation of acrylonitrile, metacrylontrile and their mixture, respectively.

EFFECT: high activity of the catalyst.

19 cl, 1 tbl, 16 ex

FIELD: chemistry.

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

72 cl, 10 ex

FIELD: chemistry.

SUBSTANCE: present invention pertains to versions of catalyst compositions for ammonolysis of an unsaturated hydrocarbon into an unsaturated nitrile and to the method of converting olefin using such a catalyst. In the first version, the catalyst composition is a complex of catalytically active oxides, comprising oxides of potassium, caesium, cerium, chrome, cobalt, nickel, iron, bismuth and molybdenum, in which the ratio of elements is presented in the following general formula: AaKbCscCedCreCOfNigFeiBijMo12Ox. In this formula, A is Rb, Li or their mixture, a assumes values from 0 to 1, b assumes values from 0.01 to 1, c assumes values from 0.01 to 1, d assumes values from 0.01 to 3, e assumes values from 0.01 to 2, f assumes values from 0.01 to 10, g assumes values from 0.1 to 10, i assumes values from 0.1 to 4, j assumes values from 0.05 to 4, x is a number, defined by the valency of other elements present. In the second version, the catalyst composition is a complex of catalytically active oxides, comprising oxides of potassium, caesium, cerium, chrome, cobalt, nickel, iron, bismuth and molybdenum, in which the ratio of elements is presented in the following general formula: AaLia'KbCscCedCreCofNigFeiBijMo12Ox. A is Rb, a assumes values from 0 to 1, a' assumes values from 0.01 to 1, b assumes values from 0.01 to 1, c assumes values from 0.01 to 1, d assumes values from 0.01 to 3, e assumes values from 0.01 to 2, f assumes values from 0.01 to 10, g assumes values from 0.1 to 10, i assumes values from 0.1 to 4, j assumes values from 0.05 to 4, x is a number, defined by the valency of other elements present. In these given versions, the catalyst does not contain manganese and zinc and is put onto a carrier, selected from a group containing silica gel, aluminium oxide, zirconium oxide, titanium oxide or their mixture. The method of converting olefin into acrylonitrile, methacrylonitrile and their mixture involves reacting olefin with a gas, containing molecular oxygen or ammonia in vapour phase, in the presence of the above mentioned catalyst. The olefin used is propylene, isobutylene or their mixture.

EFFECT: invention allows for obtaining a catalyst with high activity and increases output of nitriles.

14 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to an improved method of producing at least one product of partial oxidation and/or ammoxidation of a hydrocarbon, chosen from a group containing acrolein, acrylic acid, methacrolen, methacrylic acid, acrylonitrile and methacrylonitrile. At least one saturated hydrocarbon is subjected to heterogeneous catalysed dehydrogenation in a gas phase, obtaining a gas mixture, containing at least one partially dehydrogenated hydrocarbon. Components of the gas mixture except saturated hydrocarbon and partially dehydrogenated hydrocarbon are left in the mixture. Alternatively, the extra gas mixture obtained is partially or completely separated, and the gas mixture and/or extra gas mixture are used for obtaining another gas mixture, containing molecular oxygen and/or molecular oxygen and ammonia. This gas mixture is subjected to at least single heterogeneous catalysed partial oxidation and/or ammoxidation of at least one partially dehydrogenated hydrocarbon contained in the gas mixture and/or extra gas mixture. The gas mixture, extra gas mixture and/or the other gas mixture, before at least one partial heterogeneous catalysed oxidation and/or ammoxidation, are subjected to at least a single mechanical separation, aimed at separating particles of solid substance contained in the above mentioned gas mixtures.

EFFECT: reliable and continuous realisation of the process for relatively long periods of time.

6 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method for oxidative ammonolysis in the presence of mixed metal oxide catalysts. The method for oxidative ammonolysis to obtain an unsaturated nitrile involves bringing saturated or unsaturated hydrocarbon or a mixture of saturated or unsaturated hydrocarbon with ammonia and an oxygen-containing gas in the presence of a catalyst composition containing molybdenum, vanadium, antimony, niobium, tellurium, at least one element selected from a group consisting of titanium, tin, germanium, zirconium, hafnium and mixtures thereof, at least one lanthanide selected from a group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium and mixtures thereof. Disclosed is a version of the method for oxidative ammonolysis, where the catalyst contains, in addition to the listed elements, lithium and an element selected from sodium, caesium, rubidium and mixture thereof.

EFFECT: catalysts are characterised by very low content of tellurium in the composition, catalyst compositions are effective in gas-phase conversion of propane to acrylonitrile and isobutane to methacrylonitrile.

25 cl, 2 tbl, 15 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acrylonitrile from glycerine. The method involves a first step for gas-phase dehydration of glycerine in the presence of a catalyst having Hammett acidity, denoted by H0, less than +2, at temperature ranging from 150C to 500C and at pressure and at pressure ranging from 1 to 5 bar, to obtain acrolein; a second step for ammoxidation of acrolein on an ammoxidation catalyst at temperature ranging from 300C to 550C and at pressure ranging from 1 to 5 bar, to obtain acrylonitrile; and an intermediate step for partial condensation of water and heavy byproducts obtained at the dehydration step. The invention also relates to acrylonitrile with 14C content of the order 10-10 wt % with respect to total weight of carbon which can be obtained using the method given above.

EFFECT: method enables to optimise the acrolein ammoxidation step by reducing the amount of water and impurities in a stream rich in acrolein.

3 cl, 2 dwg, 1 tbl, 3 ex

FIELD: industrial organic synthesis.

SUBSTANCE: process, in which, in particular, acrylonitrile or methacrylonitrile are obtained, comprises reacting hydrocarbon selected from propane, propylene, and isobutylene with ammonia and oxygen source in presence of catalyst in reaction zone at elevated temperature. Reactor effluent containing unsaturated mononitrile is transferred into first column to be cooled therein with the aid of the first water stream. Cooled effluent containing unsaturated mononitrile is transferred into second column wherein it comes into contact with second water stream to absorb unsaturated mononitrile. Unsaturated mononitrile-containing second column effluent is fed into first distillation column to separate crude unsaturated mononitrile from the second water stream and routed to the second distillation column to remove at least some impurities from crude mononitrile, which is transferred into third distillation column to be further purified. Water in the form of steam and/or distilled water is added in amounts 100 to 2000 ppm to side-cut distillate containing purified mononitrile or to bottom stream coming out of the third distillation column. At least part of the latter is recycled into lower section of third distillation column or directly into column below side-cut distillate withdrawal point.

EFFECT: enhanced process efficiency.

16 cl, 1 dwg

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for extraction of organic material comprising hydrogen cyanide prepared in reactor flow in carrying out the ammoxidation reaction of propylene or isobutylene for preparing acrylonitrile or methacrylonitrile followed by feeding vapor flows from technological devices to the torch head part. At least one part of organic material from torch head part comprising hydrogen cyanide is fed to the extraction stage. Method provides reducing amount of acrylonitile and HCN feeding to combustion.

EFFECT: improved method for extraction.

9 cl

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for extraction of acrylonitrile, methacrylonitrile or hydrogen cyanide obtained from the reaction flow in the ammoxidation reaction of propane, propylene or isobutylene that involves passing the reactor flow through absorption column, extraction column and head fraction column. Method involves using such regimen of the process to prevent formation of an aqueous phase above feeding plate in the head fraction column. Method provides reducing unfavorable polymerization of hydrogen cyanide that provides significant decreasing or excluding stoppage of the head fraction column.

EFFECT: improved method for extraction.

12 cl, 1 dwg, 7 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to methods (variants) for producing acrylonitrile and preparing hydrogen cyanide and acetonitrile as co-products. Methods involve addition of hydrocarbon that is taken among propylene or propane, ammonia and oxygen-containing gas to the reaction zone containing a catalyst for oxidative ammonolysis and reaction is carried out at increased temperature to form acrylonitrile, hydrogen cyanide and acetonitrile, and isolation of acrylonitrile, hydrogen cyanide and acetonitrile from reactor also. According to the first variant reaction is carried out in the presence of alcohols mixture containing methanol and a second alcohol among ethanol, propanol or their mixtures wherein the weight ratio of methanol to the second alcohol in alcohols mixture is maintained depending on necessary amounts of hydrogen cyanide and acetonitrile. According to the second variant reaction is carried out in the presence of alcohols mixture containing methanol and ethanol taken in the weight ratio from about 99:1 to 1::99. According to the third variant reaction is carried out in the presence of one or more alcohols taken among crude methanol, crude ethanol or crude propanol. According to the fourth variant reaction is carried out in the presence of one or more crude (C1-C4)-alcohol. Proposed method provides enhancing yield of one or both co-products, i. e. HCN and acetonitrile, formed in producing acrylonitrile.

EFFECT: improved producing method.

21 cl, 2 tbl, 8 ex

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for reducing breakthrough fraction of ammonia in the process for manufacturing acrylonitrile. Method involves addition of hydrocarbon taken among the group consisting of propane and isobutene, ammonium and oxygen-containing gas to the bottom reactor compartment with fluidized bed and containing a catalyst for ammoxidation followed by interaction in the presence of indicated catalyst to form acrylonitrile. Method involves addition into reactor in the point lower by flow from feeding alkane of at least one among from C2- to C5-olefins that reacts with at least part of unreacted ammonia and oxygen presenting in the reactor that allows to carry out the significant reducing the ammonia amount presenting in the reaction flow coming out from the reactor. Except for, invention relates to a method for conversion of acrylonitrile manufacture based on propylene raw wherein propylene, ammonia and oxygen react in reactor in the presence the catalyst used in acrylonitrile manufacturing to the process of acrylonitrile manufacturing based on propane raw wherein propane, ammonia and oxygen reacts in the presence of catalyst used in preparing acrylonitrile. Method involves the following stages: (a) replacing the parent propylene-base raw with the propane-base parent raw; (b) addition into reactor in the point lower by flow from feeding alkane of at least one among from C2- to C5-olefin that reacts with at least part of unreacted ammonia and oxygen presenting in the reactor that results to reducing the amount of ammonia presenting in the reaction flow coming out from the reactor, and (c) addition agents for separation, trapping and recycling of unreacted propane to the process.

EFFECT: improved manufacturing method.

13 cl, 19 ex

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