Method for purifying exhaust gases of isopropyl benzene oxidization

FIELD: chemistry.

SUBSTANCE: method for purifying exhaust gases of isopropyl benzene oxidation consists in recovering isopropyl benzene by a low-temperature condensation. To create low temperatures, the energy of the exhaust gases of the isopropyl benzene oxidation is used.

EFFECT: invention makes it possible to increase the recovery of isopropyl benzene from the exhaust gases.

1 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method of hydrocarbon gas preparation for transportation includes the following stages. Formation gas is delivered to a separator of the first stage. Gas separated in the separator of the first stage is compressed and cooled down. Then gas separated in the separator of the first stage is delivered through heat exchanger of the first cooling stage to the separator of the second stage. Then gas separated in the separator of the second stage is delivered through heat exchanger of the second cooling stage and reducer to the separator of the third stage. Liquid from the separator of the second stage is delivered to the separator of the third stage. Gas from the separator of the third stage is delivered to reducer thus ensuring additional cold production. Then gas from the reducer is delivered to the heat-exchanger of the second cooling stage thus ensuring additional cold recovery. Gas is sent from the heat-exchanger of the second cooling stage to the reducer. Then gas is delivered from the reducer to the heat-exchanger of the first cooling stage and further this gas is outputted from the plant.

EFFECT: improved energy efficiency of gas preparation with multi-stage low-temperature gas separation.

1 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: method of gas mix separation is implemented in gas mix flow. Components are separated from gas mix flow by direct injection of low-temperature coolant into the gas flow mix. Coolant is formed of gas mix separation product obtained at each stage of mix cooling and component separation. A part of each separation product obtained is aftercooled using external cooling source and then returned directly to all stages of gas mix cooling and gas component separation. After all stages of cooling and gas component separation, the gas mix flow is aftercooled using external cooling source and then returned directly to previous stages of mix cooling and component separation, forming repeated gas mix flow transfer and cooling cycles.

EFFECT: reduced capital, operation and power costs, along with high separation degree of mixes of any composition.

3 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes wet gas separation at the first stage with the production of the water and HC condensates, and the first separation stage gas that is subjected to partial condensation due to counterflow cooling of the gas and condensate of the third separation stage with the production of gas and condensate of the second separation stage, as well as heated condensate of the third separation stage and commercial gas. The gas from the second separation stage is mixed up with weathering gas, its flow is restricted and separated with the production of the gas and condensate of the third separation stage, which are delivered as cooling agents to partial condensation of the gas from the first separation stage, at that the condensate of the third separation stage is delivered by a pump. The heated condensate of the third separation stage together with the hydrocarbon condensate of the first separation stage and condensate of the second separation stage are separated at a pressure close to the pressure of the first and second separation stages with the production of weathering gas, unstable condensate and water condensate. If necessary, in the gas line of the first and/or the second separation stage a hydrates inhibitor is injected, and the spent solution of the hydrates inhibitor is drained from the unit.

EFFECT: increased output of commercial gas, improved recovery degree of heavy components, excluding ejection of weathering gas.

2 cl, 1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method of three-stage low temperature (LT) gas separation means wet gas separation at the first stage with production of the water and HC condensates, and first separation stage gas that is subjected to partial condensation due to counterflow cooling of the gas and condensate of the third separation stage with production of gas and condensate of the second separation stage, as well as heated condensate of the third separation stage and sales gas. Gas of the second separation stage is throttles under conditions of the weathering gas ejection, and is separated with production of gas and condensate of the third separation stage, that are supplied as refrigerants for the partial condensation of the gas of the first stage of separation. Heated condensate of the third stage of separation together with the throttled mixture of HC condensate and condensate of the second separation stage are separated with production of the weathering gas, unstable condensate and water condensate. If necessary, in the gas line of the first and/or the second separation stage the hydrates inhibitor is injected, and spent solution of the hydrates inhibitor is drained from the unit.

EFFECT: increased degree of heavy components recovery and reduced dew point of sales gas.

2 cl, 1 dwg, 1 ex

FIELD: machine building.

SUBSTANCE: separation device comprises a premix chamber with the device of twisting of medium flow installed in it, the nozzle channel connected with the premix chamber for separation, and the unit for separation of droplets and/or solid particles. The separation channel containing convergent, divergent, and located between them cylindrical sections, differing by that the cylindrical section has the length of the generatrix greater than 0.1D, where D - diameter of the cylindrical section, meanwhile the divergent section is designed with a ring ledge as a step the plane of which is perpendicular to the channel axis.

EFFECT: decrease of pulsation level in a flow and, as a result, increase of efficiency of separation and reduction of losses of total pressure of medium flow.

8 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to method for liquefaction of nitrogen-containing input fraction enriched with hydrocarbons, preferably natural gas. The method includes the following stages: a) the feed fraction (1) is burned (E1, E2); b) divided by fractional distillation (T1) to the fraction enriched with nitrogen (9), wherein methane content is max. 1 vol. %, and the nitrogen-depleted fraction enriched with hydrocarbons (4); c) the above fraction (4) is overcooled (E3) and expanded (b); d) the expanded nitrogen-depleted fraction enriched with hydrocarbons (5) is divided (D1) into liquid fraction enriched with nitrogen (6), wherein nitrogen content is max. 1 vol. %, and fraction enriched with nitrogen (7); and e) the fraction enriched with nitrogen (7) is added to the feed fraction (1).

EFFECT: method allows removal of all nitrogen contained in the feed fraction either by liquid product gas or by highly-concentrated nitrogen fraction.

7 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: method of separating inert gases from gases containing at least argon, xenon, krypton, nitrogen and hydrogen includes cooling a starting gas stream, liquefaction and separation via single-step fractionation. Said fractionation is carried out to obtain liquid separation products: argon and a krypton-xenon mixture, and gaseous separation products: nitrogen, mixture of carbon-nitrogen oxides and a nitrogen-hydrogen mixture. Before fractionation, a large part of the gas stream after cooling is condensed, separated and supercooled, and the smaller part is compressed before cooling. The mixture of carbon-nitrogen oxides is subjected to catalytic oxidation of carbon monoxide to obtain carbon dioxide, nitrogen and water at the output, and hydrogen is separated from the nitrogen-hydrogen mixture. An apparatus for separating inert gases is described.

EFFECT: reduced harmful emissions and extraction of valuable components - inert gases - from tail gases.

10 cl, 1 dwg, 1 tbl

Gas separation // 2528689

FIELD: oil-and-gas industry.

SUBSTANCE: proposed process includes gas feed to absorber. Cooled absorbent is fed to absorber top, dry gas being diverted therefrom and saturated absorbent being discharged from absorber bottom to rectifier tower. Propane-butane fraction is diverted the rectifier top and used as reflux. Gas gasoline is diverted is off-stream via evaporation section while absorbent is discharged from rectifier bottom. After cooling, said absorbent is fed to absorber top and, then, heat is fed to its bottom, rectifier bottom and heat evaporation section bottom. Fluid at absorber lower trays is heated by rectifier column residue preheated in boiler and fed to absorber bottom.

EFFECT: power savings.

2 dwg, 2 tbl

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to liquefying of natural or associated oil gas, i.e. propane-butane fraction. Initial flow is cooled, separated to isolate light portion of low-molecular hydrocarbon stock to be liquefied with extraction of liquid propane-butane fraction in power vortex separator. Said vortex separator is composed of three-section vessel accommodating vortex tube to divide the latter into three sections, top, mid and bottom, by horizontal walls. Note here that top section accommodates cold end with vortex tube coil heat exchanger, mid-section accommodating hot end. Bottom section houses hot flow rate regulator and separator of liquid phase from said flow equipped with the valve.

EFFECT: higher yield of pure hydrocarbon stock.

2 dwg

Gas compression // 2524790

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises gas compression, cooling of liquid hydrocarbons release during gas compression and its separation to get compressed gas and condensate. Said liquid hydrocarbons release during gas compression is pre-cooled by unstable condensate under conditions of its stabilisation. Then, liquid hydrocarbons release during gas compression is mixed with stabilisation gas and cooled by coolant and separated under conditions of partial condensation to get compressed gas and unstable condensate. Unstable condensate is stabilised to get stabilised gas and stabilisation gas via light components stripping by heating with liquid hydrocarbons release during gas compression.

EFFECT: higher yield of compressed air, reduced losses of target components.

3 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of separating monoalkylbenzene from a gas flow, containing oxygen and monoalkylbenzene. The gas flow, containing oxygen and monoalkylbenzene, contacts with a liquid flow, including polyalkylbenzene, a compound, containing two phenyl groups, bound to each other via an alkylene bridge C1-C3, or their mixture. The invention also relates to a method of obtaining alkylphenylhydroperoxide.

EFFECT: claimed method makes it possible to separate monoalkylbenzene in an effective and selective way.

17 cl, 1 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method of increasing productivity of catalyst of benzene alkylation with isopropyl alcohol or mixture of isopropyl alcohol and propylene, which includes realisation of said reaction of alkylation under conditions of temperature and pressure, completely corresponding to gas phase of reagents and at least partially to liquid phase of reaction products, in presence of catalytic system, containing zeolite, of MTW type. Invention relates to method of phenol obtaining.

EFFECT: application of claimed invention makes it possible to ensure better results with respect to characteristics, term of catalyst service and, accordingly, productivity, even in presence of considerable amounts of water.

16 cl, 5 ex, 2 dwg

FIELD: chemistry.

SUBSTANCE: one of the versions involves: (a) feeding alkylation raw material containing benzene and propylene into an alkylation reaction zone (100), having at least one alkylation catalyst layer containing zeolite UZM-8, having molar ratio Si/Al2 in the frame of 24-35, and (b) removing an alkylation product (10) containing cumene from the alkylation reaction zone (100) of the raw material. Propylene in the alkylation raw material is converted in the alkylation reaction zone (100) to cumene with selectivity of at least 85%.

EFFECT: improved selectivity with respect to cumene.

12 cl, 4 dwg, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of alkylating of aromatic compound to be alkylated with obtaining monoalkylated aromatic compound. method includes the following stages: A) supply of the first flow of raw material, including fresh aromatic compound to be alkylated, into the first reaction zone, which includes trans-alkylation catalyst; B) supply of the second flow of raw material, which includes polyalkylated aromatic compounds, into the first reaction zone; C) contact of said first and second flows of raw material with said trans-alkylation catalyst in said first reaction zone under conditions, suitable for realisation of reaction of trans-alkylation between said polyalkylated aromatic compounds and said aromatic compound to be alkylated, in fact, in liquid phase, with obtaining said monoalkylated aromatic compound; D) removal of the first output flow, which includes aromatic compound to be alkylated which did not react and said monoalkylated aromatic compound, from said first reaction zone; E) supply of said first output flow into fractioning system for division of said first output flow into the first light fraction, which includes said aromatic compound to be alkylated which did not react, and the first heavy fraction, including said monoalkylated aromatic compound; F) separation of monoalkylated aromatic compound from said first heavy fraction; G) supply of said first light fraction, which includes said aromatic compound to be alkylated, and third raw material flow, including alkylating agent, into the second reaction zone, which includes catalyst of alkylation; H) contact of said fist light fraction and the third flow of raw material with said catalyst of alkylation in said second reaction zone under conditions, suitable for alkylation of said aromatic compound to be alkylated by means of said alkylating agent, and obtaining the second output flow, which includes said monoalkylated aromatic compound, aromatic compounds to be alkylated which did not react and polyalkylated aromatic compounds; and I) separation of monoalkylated aromatic compound from said second output flow. In the first reaction zone, at least, part of one or more admixtures, contained in fresh flow of raw material, are removed.

EFFECT: obtaining monoalkylated aromatic compound.

15 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkylbenzenes of general formula , where R1=H: R2=Et, i-Pr or R1R2=-CH2-CH2-CH2-. The method involves hydrogenating styrene with hydrogen gas in the presence of a catalyst, followed by separation of end products, and is characterised by that styrene or derivatives thereof selected from α-methyl styrene or indene is subjected to hydrogenation, and the catalyst used is nickel nanoparticles obtained by reducing nickel (II) chloride with sodium borohydride in situ and the process is carried out at atmospheric pressure of hydrogen in a medium of isopropanol at temperature of 55-65°C for 4-6 hours.

EFFECT: use of the present method simplifies production of compounds of the disclosed structural formula.

1 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method for transalkylation of benzene with polyalkyl benzenes on a zeolite-containing catalyst to obtain ethylbenzene or isopropylbenzene. The method is characterised by that the polyalkyl benzenes used are diethyl benzenes or diisopropyl benzenes; the process is carried out in a section reactor. The main benzene stream is fed into the first section of the reactor with the ratio of benzene to diethyl benzene in the first section of the reactor equal to 9:1 or 10.5:1, or 15:1 or 16.5:1 or 18:1 or the ratio of benzene to diisopropyl benzene in the first section of the reactor equal to 7.2:1 or 9.6:1. Polyalkyl benzenes are fed into each section of the reactor having a zeolite catalyst bed, and an amount of benzene, which is such that the total weight ratio of benzene to polyalkyl benzene in the reactor is equal to 1:1-6:1, is fed into each section of the reactor having a zeolite catalyst bed, except the first section.

EFFECT: use of the present invention prolongs catalyst life, increases conversion of polyalkyl benzene and selectivity with respect to the end product.

4 cl, 14 ex, 2 tbl, 6 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to catalytic processes for producing cumene. Described is a method of prolonging stable operation of a catalyst, which contains a hydrogenating component and an alkylating component, in a reaction for producing cumene by hydroalkylation of benzene with acetone, involving layer by layer arrangement of the hydrogenating and alkylating components in the catalyst, wherein the hydrogenating component is placed first on the path for feeding material, the hydrogenating component being copper chromite and/or copper oxide, which is promoted by metals selected from: manganese, gallium, chromium, rare-earth metals, with weight ratio of copper to promoter metals equal to (4.0-6.0):1; the alkylating component is placed second on the path for feeding material, the alkylating agent being micro-mesoporous dealuminated MOR or BEA or FAU, wherein the amount of the hydrogenating component in the catalyst is equal to 15-35 wt % of the total amount of the catalyst. Described is a method of producing cumene by hydroalkylation of benzene with acetone, which is characterised by that hydroalkylation is carried out in a flow reactor with a fixed catalyst bed at 150-250°C, mass flow rate of feeding material of 0.3-7 h-1, molar ratio of benzene to acetone of 4:1-9:1, molar ratio of hydrogen to acetone of 1:1-10:1, and pressure of 0.1-3 MPa, using the catalyst described above.

EFFECT: longer time for stable operation of the catalyst.

5 cl, 1 tbl, 19 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkylbenzenes of general formula ,where R1=H; R2=Et, i-Pr or R1R2=CH2-CH2-CH2-, which involves hydrogenation of styrene with hydrogen gas in the presence of a catalyst, followed by separation of end products, which is characterised by that styrene or derivatives thereof selected from α-methylstyrene or indene are subjected to hydrogenation, and the catalyst used is nickel nanoparticles which are obtained by reducing nickel (II) chloride with lithium aluminium hydride in situ and the process is carried out at atmospheric pressure of hydrogen in a tetrahydrofuran medium at temperature of 50-60°C for 5-6 hours.

EFFECT: use of the invention simplifies the method of producing compounds of the disclosed structural formula.

1 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates a method of producing isopropylbenzene. The method involves alkylating benzene with propylene in the presence of an aluminium trichloride-based catalyst complex by feeding dried benzene charge material, polyalkylbenzenes, propylene, catalyst complex and recycled catalyst complex into the alkylation reactor in turbulent conditions. The method is characterised by that mixing the dried benzene charge material and polyalkylbenznes with propylene is carried out in a vortex mixer before feeding into the manifold of the alkylation reactor, and the recycled catalyst complex is fed into the middle part of the alkylation reactor.

EFFECT: use of the present invention increases selectivity of the process, increases output of the end product, reduces consumption of raw materials: benzene, propylene, aluminium trichloride-based catalyst complex.

1 cl, 4 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to versions of a method for alkylation of an alkylation substrate, which is an aromatic compound, using an alkylation agent, one of which involves: directing a crude stream of alkylation substrate, which contains the alkylation substrate in form of an aromatic compound, to an impurity adsorption zone which contains a cleaning adsorbent which contains clay or resin, which is selective towards impurities which contain basic organic nitrogen compounds, to obtain a cleaned stream of the alkyaltion substrate which contains the alkylation substrate in form of an aromatic compound, and nitriles; directing at least a portion of the cleaned stream of alkylation substrate and at least a portion of the reaction output stream to a separation zone; extraction of a contaminated stream of substrate from the separation zone, which contains the alkyaltion substrate in form of an aromatic compound, and nitriles; directing at least a portion of the contaminated stream of alkylation substrate which contains the alkylation substrate in form of an aromatic compound, at least 20 pts. wt per million of water and nitriles into a nitrogen adsorption zone, which functions at temperature 120-300°C and contains an adsorbent which contains acidic molecular sieves which are selective towards nitriles, and extraction of a denitrated substrate stream from the nitrogen adsorption zone, containing the alkylation substrate which is in form of an aromatic compound and has concentration of nitriles which is less than concentration of nitriles in the contaminated sustrate stream;and directing the alkylating agent and at least a portion of the denitrated substrate stream, which contains the alkylation substrate which is in form of an aromatic compound, into the alkylation reaction zone separate from the nitrogen adsorption zone, alkylation of the alkylation substrate, which is in form of an aromatic compound, with an alkylation agent over an alkylation catalyst to form an alkylation product and extraction of a reaction output stream containing an alkylation product from the alkylation reaction zone.

EFFECT: present invention enables creation of a protective layer which will adsorb nitriles from a stream of hydrocarbon material in the presence of water.

19 cl, 4 ex, 3 tbl, 9 dwg

FIELD: machine building.

SUBSTANCE: device contains rotary adsorber connected with transit gas duct, the adsorbed is made out of cylindrical casing with lids, branch pipes for flue gases input and output, inside it rotor with radial cells is installed, it is filled with adsorbent - granulated blast-furnace slag. At that the rotary adsorber is connected with the transit gas duct via the heat exchanger with cone tray, it is cooled by cooling medium, the rotary adsorber lid is made in form of two half-cone lids with nozzles for flushing water spraying and output of cleaned flue gases, the bottom is made in form of two half-cone bottoms with nozzles for flushing water output and input of cooled flue gases, the radial cells of rotor are filled with two layers of adsorbents A1 and A2 with height H1 and H2, respectively, at that the top layer A1 includes pumice granules of metallurgic slags with basicity factor M > 1, diameter from 20 to 40 mm, and bottom layer A2 is chips of active anthracite with same diameter of particles.

EFFECT: increased economic and ecologic efficiency of cleaning of flue gases produced by domestic wastes combustion.

4 dwg

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