Regeneration of metal-containing catalysts

FIELD: chemistry.

SUBSTANCE: invention relates to method for regeneration of coked metal-containing catalyst. Method includes interaction of coked metal-containing catalyst in regeneration zone with atmosphere which contains carbon dioxide and carbon monoxide, where ratio of partial carbon monoxide pressure to partial carbon dioxide pressure in regeneration zone constitutes from 2.3:1 to 100:1, and which contains less than 100 ppm of molecular oxygen, at temperature, equal from 600°C to 900°C, for the time, equal from approximately 0.1 to approximately 60 min, with method additionally including interaction of coked metal-containing catalyst in regeneration zone with atmosphere, which contains hydrogen, at temperature, equal not lower than 400°C, simultaneously with said interaction with said atmosphere, containing carbon dioxide and carbon monoxide, or after it.

EFFECT: elaboration of regeneration method, which is effective for coke removal and produces minimal unfavourable impact on metal-containing catalyst.

12 cl, 8 dwg, 3 tbl, 3 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: isoprene is obtained by liquid-phase interaction of formaldehyde and isobutylene and/or substances, which represent their sources, for instance 4,4-dimethyldioxane-1,3 and trimethyl carbinol, at higher temperature and pressure in presence of water solution of inorganic acid and metal cations as catalyst, with distillation of reaction products and water from reaction zone and further isoprene separation, with carrying out isoprene synthesis in presence of catalyst, which includes mixture of either ortho- and pyrophosphoric acids, or ortho- and poly-phosphoric acids, or ortho- and metaphosphoric acids and cations of metals of VI, VIII and X group of Mendeleev′s Periodic table of elements, content of which constitutes 0.5-6.0 g/l.

EFFECT: method makes it possible to realise process with higher productivity.

3 cl, 1 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: isoprene is obtained by liquid-phase interaction of formaldehyde and isobutylene and/or substances, which represent their sources, for instance 4,4-dimethyldioxane-1,3 and trimethyl carbinol, at higher temperature and pressure in presence of water solution of inorganic acid and metal cations as catalyst, with distillation of reaction products and water from reaction zone and further isoprene separation. Isoprene synthesis is carried out in presence of catalyst, which includes mixture of ortho- and pyrophosphoric acids, or ortho- and poly-phosphoric acids, or ortho- and metaphosphoric acids and cations of metals of VI and X group of Mendeleev′s Periodic table of elements, with weight ratio mixture of inorganic acids, counted per orthophosphoric acid:cations of metals of VI group:cations of metals of X group equal 1:(0.01-0.5):(0.003-0.04) respectively.

EFFECT: method makes it possible to realise process with higher productivity.

3 cl, 8 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: catalyst for obtaining isoprene by liquid-phase interaction of formaldehyde and isobutylene and/or substances, for instance 4,4-dimethyldioxane-1,3 and trimethyl carbinol, including water solution of inorganic acid and cations of metals, with catalyst containing as inorganic acid either mixture of ortho- and pyrophosphoric acids, or ortho- and poly-phosphoric acids, or ortho- and metaphosphoric acids and cations of metals of VI and X group of Mendeleev's Periodic table of elements with weight ratio mixture of inorganic acids, counted per orthophosphoric acid:cations of metals of VI group:cations of metals of X group equal 1:(0.01-0.5):(0.003-0.04) respectively.

EFFECT: method makes it possible to realise process with higher productivity.

2 cl, 1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining isoprene, which includes condensation of isobutylene with water solution of formaldehyde in presence of acid catalyst at temperature 80-110°C, pressure 15-25 atm, separation of reaction mass into oil and water layers, evaporation of water layer, addition of formaldehyde to residue after evaporation of initial water solution and recirculation of obtained mixture into condensation zone, extraction of fraction of 4,4-dimethyl-1,3-dioxane from oil layer with its following liquid-phase decomposition in presence of tertiary butyl alcohol and/or isobutylene into isoprene at increased temperature and pressure. Method is characterised by the fact that supplied to decomposition fraction of 4,4-dimethyl-1,3-dioxane contains from 0.6 to 4.2 wt % of high-boiling by-products.

EFFECT: method makes it possible to reduce power consumption at stage of 4,4-dimethyl-1,3-dioxane extraction.

2 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: according to the method, the starting raw material is supplied into two successively connected reaction units - first and second with pentasil ceolite catalyst elements; the reaction units are characterised by the environment for hydrocarbon conversion into aromatic ones; the mixture produced after reaction units are divided into liquid and gas fractions; the gas fraction is supplied into an input of the first and second reaction unit. The gas fraction produced after the reaction units are divided into hydrogen-containing gas and a wide light hydrocarbon fraction containing olefins; the hydrogen-containing gas is supplied into an oxygenate synthesis unit; the formed oxygenated are supplied into an input of the first and second reaction units; the wide light hydrocarbon fraction containing olefins is supplied into an input of the first reaction unit.

EFFECT: using the present invention enables increasing the effectiveness of aromatic hydrocarbon concentrates and the alkyl benzene, particularly xylene, selectivity.

19 cl, 5 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining light olefins. Method includes: (a) passing oxygenate raw material into reactor for converting oxygenates into olefins for oxygenate raw material to contact with molecular-sieve catalyst and to be converted in light olefins, which are discharged from reactor for conversion of oxygenates in olefins in form of outflow; (b) division of outflow into first flow of light olefins, separated from first flow, containing C4 and heavier hydrocarbons; (c) selective hydration and further cracking of first flow, containing C4 and heavier hydrocarbons, in second reactor of olefin cracking, with application of catalyst of olefin cracking, with formation of first outflow of cracking gases, containing light olefins; (d) separate cracking of hydrocarbon flow with formation of second outflow of cracking gases, containing light olefins, and separate flow of pyrolysis gas, containing C4 and heavier hydrocarbons; (e) co-fractionation of first and second outflows of cracking gases to obtain second flow, containing light olefins, separated from second flow, containing C4 and heavier hydrocarbons; (f) co-conditioning of first flow and second flow, containing light olefins to remove acidic gases and obtain conditioned flow; and (g) division of conditioned flow in flow of ethylene product, flow of propylene product and flow, containing C4 hydrocarbons.

EFFECT: method represents improvement of method of obtaining light olefins, achieved by reasonable combination of installation for conversion of oxygenates in olefins ("МВОЛ") with installation for pyrolysis of hydrocarbons.

10 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing isoprene by reacting components of a raw material containing formaldehyde, isobutylene, isobutylene derivatives and isoprene precursors in the presence of a solid-phase acid catalyst which contains niobium phosphate, followed by separation of the end product. The method is characterised by that reaction of formaldehyde with isobutylene, isobutylene derivatives and isoprene precursors is carried out in molar ratio of isobutylene and derivatives thereof to formaldehyde of (3.5-8):1, molar ratio of isobutylene derivatives to isobutylene of (0.75-3.5):1, molar ratio of formaldehyde to isoprene precursors of (4-10):1, the raw material is fed into the reactor at temperature of 140-160°C and pressure of 13-17 atm in form of a continuous gas-liquid stream with volume rate of the gas phase of 20-250 h-1 and of the liquid phase of 10-25 h-1.

EFFECT: use of the present method increases isoprene output and reduces output of high-boiling by-products.

3 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing light olefins, which comprises: (a) passing oxygen-containing feedstock into a reactor for converting oxygen-containing compounds to olefins, such that the oxygen-containing feedstock comes into contact with a molecular sieve-based catalyst and is converted to light olefins, which come out of said reactor in the form of an effluent stream; (b) dividing the effluent stream into a first stream of light olefins and a first stream containing C4 or heavier hydrocarbons separate from the first stream; (c) selective hydrogenation and subsequent cracking of the first stream containing C4 or heavier hydrocarbons to obtain a first effluent stream of cracking gases containing light olefins; (d) separate cracking of the hydrocarbon stream to obtain a second effluent stream of cracking gases containing light olefins; (e) combined fractionation of he first and second effluent streams of cracking gases to obtain a second stream containing light olefins, separate from the second stream containing C4 or heavier hydrocarbons; (f) combined treatment of the first and second streams containing light olefins to remove acidic gases and obtain a treated stream; (g) dividing the treated stream into an ethylene product stream, a propylene product stream and a stream containing C4 hydrocarbons; and (h) optional selective hydrogenation of the stream containing C4 hydrocarbons, and subsequent fraction of the optionally selectively hydrogenated stream to separate a 2-butene stream from the first 1-butene stream. The invention also relates to a method of extracting 1-butene from a stream of C4 hydrocarbons, which uses the method described above.

EFFECT: method is an improved process of obtaining light olefins through smart combination of an apparatus for converting oxygen-containing compounds to olefin with a hydrocarbon pyrolysis apparatus.

17 cl, 4 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: method includes heating a mixture of components - 0.01 mol phenylacetylene, 0.01 mol iodobenzene (aryl iodide), 0.0006 g copper nanopowder and 0.002 g CuI at temperature of 110-120°C for 3 hours; after cooling, the reaction mass is poured into 100 ml cold water while stirring, followed by extraction with ethyl acetate, purification on a column with silica gel, elution with a solvent mixture with ratio of ethyl acetate to hexane of 1:6 and then distilling off the solvent to obtain pure products.

EFFECT: use of the present method enables to obtain end products with high output with considerable simplification of the process.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of regenerating one or more particle (particles) of the deactivated cobalt-containing Fischer-Tropsch catalyst in situ in the reactor tube, where the said catalyst particle(s) are deactivated by the application in the Fischer-Tropsch process, with the said regeneration method containing the following stages: (i) catalyst particle(s) is/are oxidised at a temperature from 20 to 400°C, preferably from 100 to 400°C, more preferably from 200 to 400°C; (ii) catalyst particle(s) is(are) processed with a solvent, containing ammonium carbonate and methylamine, ethylamine, propylamine and/or butylamine, for the time period longer than 5 minutes; (iii) catalyst particle(s) is/are dried and, optionally, heated; and (iv) catalyst particle(s) is/are reduced with hydrogen or a hydrogen-containing gas. The method of generating one or more particles of the cobalt-containing Fischer-Tropsch catalyst also contains s the following stages: (a) catalyst particle(s) is/are oxidised in the reactor pipe at a temperature from 20 to 400°C, preferably from 100 to 400°C, more preferably from 200 to 400°C; (b) catalyst particle(s) is/are discharged from the reactor pipe; (c) catalyst particle(s) is/are processed with a solvent, containing ammonium carbonate and methylamine, ethylamine, propylamine and/or butylamine, for the time period longer than 5 minutes; (iii) catalyst particle(s) is/are dried and, optionally, heated.

EFFECT: advantage of the method consists in the fact that during the processing stage only a small amount of cobalt is washed out, with the simultaneous reduction of the dissolved iron amount.

18 cl, 3 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of regenerating spent nickel-containing catalyst of hydration of unsaturated hydrocarbons, consisting of Raney nickel and aluminium oxide. Claimed method includes recovery of catalyst activity at temperature 350-400°C and atmospheric pressure in flow of hydrogen-containing gas for 0.5-1.0 h.

EFFECT: method makes it possible to recover high catalyst activity.

5 ex

FIELD: chemistry.

SUBSTANCE: described is a method of activating platinum-mordenite catalysts for hydroisomerisation of benzene-containing fractions and which is carried out at high temperature and pressure, successive treatment thereof in a current of dry air and reduction with hydrogen, wherein reduction is carried out in two steps.

EFFECT: high catalyst activity.

2 cl, 2 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalysis. Described is a method of regenerating one or more particles of a cobalt-containing Fischer-Tropsch catalyst in situ in a reactor tube, the method comprising steps: (i) oxidising the catalyst particle(s) at temperature of 20-400°C; (ii) treating the catalyst particle(s) for more than 5 min with a solvent; (iii) drying the catalyst particle(s); and (iv) optionally reducing the catalyst with hydrogen or any hydrogen-containing gas.

EFFECT: high catalyst activity.

10 cl, 4 tbl, 4 ex

Catalysts // 2497590

FIELD: chemistry.

SUBSTANCE: invention relates to catalyst regeneration. Method of regeneration of waste powder-like, paraffin-containing catalyst of Fischer-Tropsch synthesis based on cobalt is described, where claimed method includes the following sequential processing: (i) de-waxing processing, (ii) oxidative processing with regulation of work temperature by discharge of heat from layer of catalyst particles with application of cooling device, which contains device for providing passage of cooling medium and cooling medium, passing through said device of passage providing, which ensure in such way heat conductive surfaces, located in and/or around catalyst layer, with obtaining oxidised particles of catalyst, and (iii) reduction processing. Re-application of regenerative catalyst is described.

EFFECT: increase of process efficiency.

15 cl, 9 dwg, 4 ex

FIELD: oil and gas industry.

SUBSTANCE: invention refers to method for obtaining aromatic hydrocarbons from methane, namely natural gas. Invention relates to method of methane transformation into aromatic hydrocarbons according to which methane-containing initial material and granular catalytic material is supplied to reaction zone, the operation of reaction zone is provided in reaction conditions effective for transformation of at least part of methane into aromatic hydrocarbons with associated deposition of carbonaceous material on granular catalytic material that causes its (catalytic material) de-activation. At least part of de-activated granular catalytic material is removed from reaction zone and heated till the temperature approximately from 700°C to 1200°C by direct or indirect contact with gaseous combustion products obtained by combustion of auxiliary fuel. Then heated granular catalytic material is regenerated by hydrogen-containing gas in conditions effective for transformation of at least part of deposited carbonaceous material into methane and regenerated granular catalytic material is returned back into reaction zone.

EFFECT: improvement of methane aromatisation method.

26 cl, 6 dwg, 10 ex, 7 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to oil chemistry, coal chemistry and gas chemistry, in particular, to Fischer-Tropsch synthesis, namely, to activation of cobalt catalyst. Proposed method comprises catalyst activation directly in Fischer-Tropsch synthesis with immobile catalyst layer by heating catalyst on forcing hydrogen-containing gas above catalyst precursor. Note here that catalyst is heated in several steps on increasing temperature in stepwise manner. Note also said, at first step, temperature is increased at the rate of 0.5-2°C/min to 180-200°C and kept thereat unless stable carbon monoxide conversion and liquid hydrocarbon and methane selectivity characteristics are obtained. Note that said characteristics are taken to be stable is their relative difference does not exceed 10 relative percent. Then, temperature is increased by 9-12°C at the rate of 0.1-2°C/min to carbon monoxide conversion by 50-60%. Thereafter, temperature is increased by 4-6°C at the rate of 0.1-2°C/min and maintained till 60-80%-conversion of carbon monoxide.

EFFECT: ruling out separate activation step and activation at higher temperatures.

4 cl, 1 tbl, 9 ex

FIELD: technological processes.

SUBSTANCE: present invention relates to a catalyst for hydrocarbon production from synthesis gas, to method of its production, method of such catalyst regeneration and method of hydrocarbon production with application of such catalyst. A catalyst is described to produce hydrocarbon from synthesis gas, in which metal cobalt or metal cobalt and cobalt oxides; and zirconium oxides are applied onto a catalyst substrate, which mainly consists of a silicon dioxide. This catalyst is characterised by the fact that content of admixtures in the catalyst makes less or is equal to 15 wt %. Versions of the method are described to produce such catalyst, where the catalyst is produced by simultaneous or separate application of cobalt and zirconium compounds onto a catalyst substrate by impregnation method, impregnation method by moisture capacity, by method of deposition or method of ion exchange and performance of restoration treatment or baking and restoration treatment. Versions are described to regenerate such catalyst, where the catalyst with reduced activity is treated with a regenerating gas, containing hydrogen, or regenerating gas is supplied into a reactor, or regenerating gas is supplied into any part of the outer circulation system, and the catalyst and the regenerating gas contact with each other. Versions of the method to produce hydrocarbon from synthesis gas with application of such catalyst are described, where the method is carried out with performance of reaction in a liquid phase using a reactor with a layer of suspended residue or a layer of suspended residue with an external circulation system.

EFFECT: production of catalyst having high activity, durable service life and high resistance to water without loss of strength and wear resistance.

31 cl, 3 tbl, 2 dwg, 21 ex

FIELD: oil and gas industry.

SUBSTANCE: paraffin hydrotreating method involves the first stage at which paraffin with content C21 or higher of normal paraffins 70% wt or higher is used as basic material, and paraffin contacts with catalyst at reaction temperature of 270-360 °C in presence of hydrogen for hydrocracking, catalyst consisting of metal of group VIII of the Periodic Table, which is put on carrier containing amorphous solid acid; the second stage at which raw material from paraffin is replaced for some time with light paraffin with content C9-20 of paraffins 60% wt or higher, and light paraffin contacts with catalyst at reaction temperature of 120-335 °C in presence of hydrogen for hydrocracking; and the third stage at which raw material of light paraffin is replaced with paraffin and paraffin contacts with catalyst at reaction temperature of 270-360 °C in presence of hydrogen for hydrocracking. Also, invention refers to method for obtaining material of fuel system, which involves the above method.

EFFECT: use of this invention allows improving activity of hydrocracking catalyst, which deteriorates with time.

6 cl, 1 tbl, 4 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to processes of generating catalysts for hydrogenation of plant oil and fat. The invention describes a method of regenerating a spent palladium-containing catalyst for hydrogenating plant oil and fat through treatment with sodium hydroxide solution and washing with a condensate, where the catalyst is pre-washed with steam condensate until there are no traces of fat while simultaneously bubbling with hydrogen. Treatment is carried out with 10% solution of sodium hydroxide while blowing with hydrogen at the same time. Washing is carried out with steam condensate until there are completely no traces of alkali and soap and drying is carried out in a hydrogen stream at 145-150°C for 8-9 hours.

EFFECT: attaining high degree of purification and regeneration of the catalyst.

2 ex

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of petrochemistry and more specifically to a method of producing synthesis gas which is used as the feedstock, for example, for the synthesis of methanol, dimethyl ether, hydrocarbons by Fischer-Tropsch method. The method of producing synthesis gas comprises oxidative conversion of methane-containing gas at a temperature more than 650°C in through-flow riser, using as oxidant the microspherical or crushed catalyst based on metal oxides, capable of multiple redox transitions, at that the catalyst is continuously passed through the riser upwards in the methane-containing gas flow with a residence time of the feedstock in the reaction zone of 0.1-10 s, separating the catalyst passing from the reactor from the product and regeneration of the catalyst by oxidation with carbon dioxide in the regenerator from which the regenerated catalyst enters the reactor. The oxidative conversion of methane-containing feedstock and regeneration of regenerated catalyst is carried out simultaneously and continuously.

EFFECT: invention enables to improve the removal rate of the product, to reduce energy consumptions for transportation of oxygen-containing agent, to reduce the risk of explosion and ignition, as well as to adjust the composition of the synthesis gas.

7 cl, 1 tbl, 9 ex

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