Method of obtaining natural gas processed, fraction enriched by c3+ - hydrocarbons, and, optionally, flow enlarged by ethan, and also, installation appropriate for this method

FIELD: chemistry.

SUBSTANCE: method comprises the following steps: selecting a recycle stream in the upper stream exiting the separation column; establishing a certain heat exchange interaction between the recycle stream and at least one portion of the overhead stream exiting the separation column; repeated administration, after expansion, of the cooled and expanded recycle stream into the isolation column; selecting, in the bottom of the column, the separation of at least one reboiling bottoms stream and providing heat exchange between the re-boiling stream and at least one portion of the feed natural gas and/or with the recycle stream. The re-boiling of the bottom liquid is provided by calories absorbed from the original natural gas stream and/or the recycle stream. The invention also relates to a device.

EFFECT: invention allows to reduce power consumption.

15 cl, 6 dwg, 9 tbl

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the method of production of liquid CO2 from gaseous combustion products. Furnace gas is compressed in the first compressor, then it is cooled in the first cooler and is partially condensed at two separation steps. Two separation steps are cool by the expanding flue gas and the expanding liquid CO2. The second separation step includes the second heat exchanger and CO2 stripper in which the flow of liquid CO2 from the first separation step is supplied into the CO2 stripper directly and CO2 flow from the first separation step is supplied into the CO2 stripper through the second heat exchanger. Liquid CO2 in the stripper is boiled by the reboiler and from the top part of CO2 stripper flue gas is separated, expanded in the pressure control valve and is used in separation steps for cooling. Also liquid CO2 from the reboiler and CO2 stripper is collected in the buffer drum.

EFFECT: increase of purity of liquefied CO2 without increase of power consumption.

12 cl, 5 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention group refers to method of carbon dioxide-containing natural gas treatment. Treatment method involves natural gas separation by cryogenic process and can produce liquid carbon dioxide flow at one side and purified natural gas flow at another side. One part of natural gas is cooled in a first heat exchanger and then in a second heat exchanger before the cryogenic process and/or before return to the cryogenic process. One part of liquid carbon dioxide is returned to obtain recycled carbon dioxide flow. Recycled carbon dioxide flow is divided into the first and second portion. First portion is expanded, then heated in the first heat exchanger to obtain first flow of heated carbon dioxide. Second portion is cooled, then at least one part of the second portion is expanded and heated in the second heat exchanger to obtain second flow of heated carbon dioxide. Some hydrocarbons contained in the first and second flows of heated carbon dioxide are separated by gas and liquid separation. Invention claims installation for implementation of the method as well.

EFFECT: reduced hydrocarbon loss during cryogenic separation.

11 cl, 2 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to method of removing fraction with high nitrogen content. Described is method of removing fraction with high hydrogen content from initial fraction, which contains mainly nitrogen and hydrocarbons, with initial fraction being separated by method of rectification into fraction with high nitrogen content and fraction with high methane content in order to obtain cold is evaporated and overheated under possibly maximal pressure with respect to initial fraction to be cooled. In accordance with invention still liquid or partially evaporated fraction with high methane content is supplied to circulation tank, liquid portion of fraction with high-methane content formed in circulation tank preferably in the process of natural circulation is completely evaporated, and head main product of circulation tank is overheated.

EFFECT: invention is aimed at reliable and stable evaporation of fraction with high nitrogen content.

7 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of separating C2+-hydrocarbons from a starting fraction primarily containing nitrogen and hydrocarbons. The disclosed method includes: a) the starting fraction is partially condensed and fractionally divided into C2+-hydrocarbon impoverished and rich fractions; b) the C2+-hydrocarbon impoverished fraction is partially condensed and divided into a liquid fraction which forms at least a partially reverse stream for fractional separation, and a C2+-hydrocarbon impoverished gaseous fraction; c) the C2+-hydrocarbon impoverished gaseous fraction is divided in a double-column process into a nitrogen-rich and a methane-rich fraction. The liquid fraction obtained at step (b) is also at least partially fed into the double-column process and divided therein into a nitrogen-rich and a methane-rich fraction.

EFFECT: invention is aimed at improving the efficiency of separating C2+-hydrocarbons.

4 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: method and device of liquefaction of a gaseous flow, which contains hydrocarbons and acidic compounds, and in which the acidic compounds are removed in a liquefied state, when the gaseous flow, purified from the acidic compounds is gradually cooled to the liquefaction temperature. The method includes cooling the gaseous flow in such a way as to obtain the cooled gaseous flow, containing gaseous hydrocarbons and residual acidic compounds. After that, the obtained gaseous flow, purified from the acidic compounds, is additionally cooled to obtain liquid hydrocarbons.

EFFECT: method improvement.

20 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: method of separating inert gases from gases containing argon, xenon, krypton, nitrogen and hydrogen includes cooling a starting gas stream, cooling and separating via two-step fractionation to obtain liquid separation products: argon, krypton-xenon mixture, and gaseous separation products: nitrogen and a nitrogen-hydrogen mixture. The first fractionation step includes preliminary separation to obtain a reflux. The reflux obtained at the first fractionation step is used for refluxing at the second fractionation step. Before fractionation at the second step, a large portion of the gas stream after cooling undergoes preliminary separation into a gaseous fraction, which is condensed and separated, and a liquid fraction - a reflux, which is returned to the first fractionation step and then fed for supercooling before use for refluxing at the second fractionation step. The smaller portion of the gas stream is compressed before cooling. The smaller portion of the gas stream is cooled in three steps and said portion is filtered between the second and third cooling steps.

EFFECT: reduced harmful emissions and enabling extraction of inert gases from tail gases with maximum output of argon.

10 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of removing a fraction with high nitrogen content from a starting fraction primarily containing nitrogen and hydrocarbons. The starting fraction is partially condensed and divided by fractionation into a fraction with high nitrogen content and a fraction with high methane content. According to the invention, during cut-off of the supply of the starting fraction being fed for fractionation, the separation column(s) (T1/T2) and heat exchangers (E2) serving for partial condensation (E1) of the starting fraction and cooling and heating process streams formed during fractionation are kept, through one or more different coolants (6-11), at temperature levels substantially corresponding to temperature levels during the normal operating mode of the separation column(s) T1/T2) and heat exchangers (E1, E2).

EFFECT: improved method.

2 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: method of producing a multicomponent solution of a krypton-xenon mixture and a special purity solvent involves feeding a multicomponent solution into a precursor solution line, preliminary physical-chemical purification from explosive and hardening impurities, cooling and fractional separation in columns. Said columns are equipped with samplers in the concentration part or blow line and the vapour zone of the bottom. A krypton-xenon mixture containing volatile impurities and a stream of a solvent containing volatile impurities are obtained in the column for obtaining a krypton-xenon mixture. The method also includes purifying the stream of the solvent fraction in a column for obtaining special purity solvent from volatile impurities to obtain a special purity solvent. All impurities that are volatile relative to krypton are removed with the stream of the solvent fraction, wherein the part of said impurities which is semi-volatile relative to the solvent is removed in a column for purification from intermediate impurities. An apparatus for carrying out said method is described.

EFFECT: invention reduces content of impurities in a krypton-xenon mixture, simplifies and reduces the cost of processing said mixture.

3 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to method of removal of fractions with high content of nitrogen from initial fraction containing, mainly, nitrogen and hydrocarbons. Note here that initial fraction is separated by rectification into high nitrogen fraction and high methane fraction. High-methane fraction is evaporated and overheated at maximum possible pressure to produce cold. High-nitrogen fraction is at least temporarily and/or partially contracted and fed to rectification as a backflow. In compliance with this invention, at least temporarily, at least partially one partial flow (16) of compressed (C) fraction (9') with high nitrogen content after performed condensation (E1) is expanded (f) in valve and, to produce cold, at least partially, preferably completely, is evaporated (E1).

EFFECT: uniform distribution of compressor load irrespective of nitrogen concentration in initial fraction.

7 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: invention relates to a cyclone separator for fluid medium, comprising a neck part (4), which is placed between the section of inlet of the convergent fluid medium and the section of outlet of the divergent fluid medium. The cyclone separator for fluid medium is made with the capability to push the cyclone flow via the section of inlet of the convergent fluid medium and the neck part to the section of outlet of the divergent fluid medium in direction downstream the flow. The section of outlet of the divergent fluid medium comprises an inner primary outlet pipe (7) for fluid components depleted by condensing vapours and an outer secondary outlet pipe (6) for fluid components enriched with condensing vapours. The cyclone separator for fluid medium comprises an additional outer secondary outlet pipe (16). The outer secondary outlet pipe (6) is placed in the first position along the central axis (I) of the cyclone separator for fluid medium, and the additional outer secondary outlet pipe (16) is placed in the second position along the central axis (I) of the cyclone separator for fluid medium.

EFFECT: higher efficiency of a separator and purity of produced fractions.

27 cl

FIELD: oil and gas industry.

SUBSTANCE: method for additional drying and purifying of hydrogen-sulphide-containing associated gas for further usage as fuel in gas generator plants includes delivery of pre-separated gas under pressure of 0.05MPa to modular compressor station (5) for gas compressing and cooling. Then compressed gas under pressure of 0.52MPa is sent to gas-separating receiver (3) for additional drying upon compressing and cooling. Then gas is purified from mechanical impurities by series gas-treatment filter (6, 7). Purified and dried gas is delivered to modular power generating stations based on microturbines (4) for the purpose of its final usage. The system for associated gas drying and purifying contains in-series container doe separated associated gas (E-3), condensate tank (2), modular compressor station (4), gas-separating receiver (3), at least two series gas-treatment filters from mechanical impurities (6, 7) and at least two modular power-generating stations (4).

EFFECT: increased efficiency of associated gas drying and purifying.

20 cl, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to the method of treatment of the flow of water-containing liquid hydrocarbons according to which the flow of liquid hydrocarbons is pumped into the first separator separating at least free water from the named flow of liquid hydrocarbons. The rest part of the named flow of liquid hydrocarbons is pumped into the system converting into gas hydrates the free / condensed water in the flow of liquid hydrocarbons in the named system and providing at least the first liquid flow and the second liquid flow in which the named first liquid flow is the liquid phase containing gas hydrates, and the named first liquid flow recirculates in the first separator and in which the second liquid flow contains dry gas and/or condensate/oil. The invention also relates to the system for treatment of the flow of water-containing liquid hydrocarbons.

EFFECT: effective dewatering of the production fluid flow.

39 cl, 4 dwg, 3 ex

FIELD: oil-and-gas industry.

SUBSTANCE: method includes two stages of absorption: at the first stage selective stripping with reference to carbon dioxide with release of sour gas with the content of carbon dioxide no more than 30-40%, and the stripped gas with the content of hydrogen sulphide no more than 5-7 mg/m3, sent further to the second stage of absorption with obtaining the stripped gas with the content of carbon dioxide no more than 50-200 mg/m3 and total absence of hydrogen sulphide, and sour gas with the content of hydrogen sulphide no more than 200 mg/m3 is performed. Saturation of alkylamine absorbent at each stage of absorption by sour components doesn't exceed 0.4 mol/mol, and natural gas has a hydrogen sulphide to carbon dioxide ratio, equal to 1.0, but no more than 1.5, and hydrogen sulphide concentration from 3.5 to 8.0 by the volume %. The unit comprises two series units for absorption stripping of gas comprising an absorber, a regenerator, pumps, a refrigerator, a recuperative heat exchanger, a boiler, a vessel and pipings of units of absorption stripping of gas.

EFFECT: invention provides effective stripping of natural gas from carbon dioxide and hydrogen sulphide.

19 cl, 2 dwg, 3 ex, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to desulphurisation of hydrocarbons. The method includes the following stages: (i) passage of the mixture of hydrocarbon and hydrogen through desulphurisation catalyst with conversion of organosulphur compounds present in the above hydrocarbon to hydrogen sulphide; (ii) passage of the obtained mixture through sorbent of hydrogen sulphide containing zinc oxide with reduction of hydrogen sulphide content in the mixture; and (iii) passage of gas mixture lean with hydrogen sulphide through additional desulphurising material. The additional desulphurising material contains mouldable mixture of one or more nickel compounds in the form of particles, the carrier material containing zinc oxide in the form of particles and optionally one or more compounds of promoted metals in the form of particles selected from iron, cobalt, copper and precious metals. At that the above desulphurising material contains 0.3-20 wt % of nickel and 0-10 wt % of promoted metal. The hydrocarbon stock reforming method is suggested with usage of the above hydrocarbon desulphurisation method.

EFFECT: increased efficiency of hydrocarbon desulphurisation with sulphur content up to <5 parts per billion.

17 cl, 7 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention is related to combustible gas enrichment system capable to improve energy saving performance considering service life of a suction device, wherein the combustible gas enrichment system comprises an adsorption unit filled with adsorbing agent for selective adsorption of combustible gas; the initial gas feed unit capable of feeding initial gas comprising combustible gas to the adsorption unit from outside area; the suction device capable of gas suction from inner part of the adsorption unit and a control device to perform absorption and desorption process, at that the control device ensures operation of the suction device so that suction force of the suction device is less when desorption process does not take place than the suction force of the suction device when desorption process takes place.

EFFECT: improved energy saving performance.

5 cl, 6 dwg, 6 tbl

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: oil-and-gas industry.

SUBSTANCE: invention relates to a gas drying method. The proposed method comprises forcing of gas through one or several cooling chambers connected in series. Note here that a solvent flow is fed into every chamber to remove water from the gas. Then, the mixed flow of the gas and solvent is fed in every cooling chamber to be cooled therein and, thereafter, to be separated by a gas-fluid separator into the gas flow with the reduced water content and the solvent flow enriched with water. The water content in the gas is gradually decreased sequentially in all the cooling chambers. Note also that every flow of the solvent separated and enriched with water is either used as an upstream cooling chamber feed flow or returned to a recovery unit for water separation. Note also that the solvent downstream of the coiling chamber is directed from the gas-fluid separators into the recovery unit to be recycled and fed upstream of the last chamber to the mix of the gas and solvent. The recovered solvent flow downstream of the recovery unit is fed to the gas flow of the last downstream chamber, the solvent separated downstream of the said chamber is fed to all other upstream cooling chambers.

EFFECT: perfected method.

7 cl, 2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to a method of drying of natural gas or industrial gas containing acid gaseous components. Gas is dried to remove acid gaseous components therefrom. The same physical solvent is used at both process steps. Gas to be dried is brought in contact with a physical solvent to absorb the major portion of water contained therein. The physical solvent being enriched with water is fed to the solvent recover unit wherein the said solvent is heated. Water contained in the solvent is separated in a countercurrent at the solvent recovery unit with the help of the flow of acid gas extracted from the dried useful gas during absorption of the acid gas. Note here that the acid gas is, again, released at the said recovery unit and separated from the solvent and released from the said unit for the solvent recovery. The invention relates also to a plant for the implementation of the described process.

EFFECT: invention provides efficient gas drying.

20 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: gas drying method lies in alternated passage of the dried gas through absorbers, one of them is used in drying mode while the second one - in regeneration mode, at that main absorbers are used for drying of the main flow rate of gas and auxiliary absorbers are used for drying of regeneration gas. Gas after regeneration of the main absorbers is directed to the primary gas cooler in order to cool it down and to eliminate primary condensate, thereafter it is delivered to the compressor input, where its pressure is increased, then gas is directed to the receiver where gas pressure is decreased and then gas is delivered to one of the auxiliary absorbers for final drying, thereafter gas is sent to the input of drying unit. At that, with absorbent moisturising in one of the auxiliary absorbers, in parallel to the process of the main absorber regeneration, regeneration of the auxiliary absorber takes place; to this end part of the dried regeneration gas is directed to the second auxiliary absorber operated in regeneration mode and then to the atmosphere. The gas drying unit contains an input pipeline, two absorbers with pipelines, valves with control system, a choke, a compressor, a receiver and a regeneration unit containing auxiliary absorbers, at that outlet pipelines of the main absorbers are connected to the heat exchanger for the purpose of gas primary cooling, the compressor and receiver.

EFFECT: invention allows effective drying of gas and elimination of gas emissions to the atmosphere.

6 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: gas drying method lies in alternated passage of the dried gas through absorbers, one of them is used in drying mode while the second one - in regeneration mode, with sampling and heating of a part of the dried gas for absorbent regeneration, at that gas after absorbers regeneration is directed to the primary gas cooler in order to cool it down and to eliminate primary condensate; thereafter it is directed to the freezing chamber for further decrease of temperature and receipt of secondary condensate; then dried and cooled gas is supplied to the compressor input where its pressure is increased up to the value not less than input pressure of the dried gas, then gas is sent to the receiver and to input of the drying unit. The gas drying unit contains an input pipeline, two absorbers with inlet and outlet pipelines connected in series with a heat exchanger for the purpose of gas primary cooling, a freezing chamber, a condensate sampler, a compressor and receiver, valves with control system ensuring switching of absorbers from drying mode to regeneration mode, and choke with pipeline feeding the dried gas to the regenerated absorber.

EFFECT: invention ensures effective gas drying by means of a gas drying unit with closed regeneration circle and allows exclusion of gas emissions to the atmosphere.

6 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: method of thermocatalytic processing of industrial and solid household wastes includes milling wastes and their thermal processing in air medium at 550-750C and pressure 1.2-2.0 atm, catalytic thermodestruction of gaseous products in presence of transition metals of iron subgroup, characterised by the fact, that catalytic thermodestruction is realised at temperature 500-550C, weight ratio of catalyst and wastes 0.01-0.05, air consumption 1.5-4.0 m3 per 1 kg of solid raw material, as catalyst transition metals of iron subgroup, applied on artificial zeolite ZSM-5 in quantity 1-15 wt %, are applied.

EFFECT: reduced content of resins, method is characterised by degree of conversion, percent of gasification.

5 tbl, 6 ex

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