EP2347206A2 - Verfahren zum abtrennen von stickstoff - Google Patents
Verfahren zum abtrennen von stickstoffInfo
- Publication number
- EP2347206A2 EP2347206A2 EP09759662A EP09759662A EP2347206A2 EP 2347206 A2 EP2347206 A2 EP 2347206A2 EP 09759662 A EP09759662 A EP 09759662A EP 09759662 A EP09759662 A EP 09759662A EP 2347206 A2 EP2347206 A2 EP 2347206A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nitrogen
- fraction
- rich fraction
- rich
- methane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 38
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 15
- 238000009833 condensation Methods 0.000 claims abstract description 5
- 230000005494 condensation Effects 0.000 claims abstract description 5
- 238000005057 refrigeration Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000001307 helium Substances 0.000 claims description 6
- 229910052734 helium Inorganic materials 0.000 claims description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 7
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
- F25J3/0209—Natural gas or substitute natural gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0257—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/04—Processes or apparatus using separation by rectification in a dual pressure main column system
- F25J2200/06—Processes or apparatus using separation by rectification in a dual pressure main column system in a classical double column flow-sheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/76—Refluxing the column with condensed overhead gas being cycled in a quasi-closed loop refrigeration cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/78—Refluxing the column with a liquid stream originating from an upstream or downstream fractionator column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/04—Recovery of liquid products
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/02—Bath type boiler-condenser using thermo-siphon effect, e.g. with natural or forced circulation or pool boiling, i.e. core-in-kettle heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/02—Internal refrigeration with liquid vaporising loop
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/04—Internal refrigeration with work-producing gas expansion loop
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/42—Quasi-closed internal or closed external nitrogen refrigeration cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2280/00—Control of the process or apparatus
- F25J2280/02—Control in general, load changes, different modes ("runs"), measurements
Definitions
- the invention relates to a process for separating a nitrogen-rich fraction from a feed fraction comprising essentially nitrogen and hydrocarbons, wherein the feed fraction is fractionally separated into a nitrogen-rich and a methane-rich fraction, the methane-rich fraction for the purpose of cooling the highest possible pressure against the cooled feed fraction is evaporated and superheated and the nitrogen-rich fraction at least temporarily and / or at least partially compressed and the rectification is supplied as a reflux stream.
- the feed fraction essentially containing nitrogen and hydrocarbons, which may have been subjected to a pretreatment, such as sulfur removal, carbon dioxide removal, drying, etc., fed to a heat exchanger E1 and in this against process streams, to which in the following even closer will be received, cooled and partially condensed.
- a pretreatment such as sulfur removal, carbon dioxide removal, drying, etc.
- the partially condensed feed fraction is fed to a pre-separation column T1.
- This pre-separation column T1 together with the low-pressure column T2, forms a double column T1 / T2.
- a hydrocarbon-rich liquid fraction is withdrawn via line 2, subcooled in the heat exchanger E2 against process streams, which will be discussed in more detail below, and then fed via line 2 'and expansion valve a to the low-pressure column T2 in the lower region.
- a liquid nitrogen-rich fraction is withdrawn from the upper region of the pre-separation column T1.
- a partial stream of this fraction is added via line 3 * as reflux to the pre-separation column T1.
- the withdrawn via line 3 nitrogen-rich fraction is supercooled in the heat exchanger E2 and supplied via line 3 "and expansion valve b of the low pressure column T2 above the feed point of the above-methane-rich fraction.
- a nitrogen-rich gas fraction is withdrawn at the top of the low-pressure column T2.
- Their methane content is typically less than 1% by volume.
- the nitrogen-rich fraction is then heated and superheated before being withdrawn via line 4 "and either released into the atmosphere or optionally fed to another use.
- a methane-rich liquid fraction which in addition to methane includes the higher hydrocarbons contained in the feed fraction withdrawn. Their nitrogen content is typically less than 5% by volume.
- the methane-rich fraction is pumped by the pump P to the highest possible pressure - this is usually between 5 and 15 bar - pumped.
- the methane-rich liquid fraction is heated and optionally partially evaporated. Via line 5 ', it is then fed to the heat exchanger E1 and completely evaporated and superheated in this against the feed fraction to be cooled, before it is withdrawn via line 5 "from the process.
- NRUs Nemrogen Rejection Unit
- a nitrogen content of more than 5 mol% exceeds typical specifications of natural gas pipelines in which the nitrogen / hydrocarbon mixture is transported.
- gas turbines can only be operated up to a certain nitrogen content in the fuel gas.
- Such NRUs are typically built similar to an air fractionator with a double column, such as described. With reference to Figure 1, as a central processing unit.
- a partial flow of the nitrogen-rich fraction which is fed via line 9 a single or multi-stage compressor C, at least to the pressure of the pre-separation column T1, thus compressed to a pressure between 20 and 50 bar.
- the compressed partial flow of the nitrogen-rich fraction is passed through the lines 9 'and 9 "through the heat exchangers E1 and E2 and cooled in this and partially or completely condensed.
- the compressed partial flow of the nitrogen-rich fraction of the pre-separation column T1 and / or the low-pressure column T2 can be supplied as a reflux stream.
- the compressed partial stream can be added via line 13 at least partially directly to the nitrogen-rich (product) fraction.
- the compressor C is hitherto used exclusively for the purity of the nitrogen-rich gas fraction withdrawn via line 4 from the low-pressure column T2 comply with variable nitrogen content in the feed fraction.
- a low nitrogen content in the feed fraction requires a higher compressor line than a mean nitrogen content. From a certain nitrogen limit in the feed fraction, however, the operation of the compressor C is no longer required.
- a typical task is to process a feed fraction with time-increasing nitrogen content. This leads to the compressor C having to perform its full power at the beginning. With increasing nitrogen content in the feed fraction, the compressor performance can be increasingly reduced. From a certain nitrogen concentration in the feed fraction of the compressor is inoperative.
- the object of the present invention is to provide a generic method for separating a nitrogen-rich fraction from a feed fraction containing essentially nitrogen and hydrocarbons, which allows a utilization of the compressor, regardless of the nitrogen concentration in the feed fraction, to those with the Compressor associated, substantial investment costs to amortize.
- Hydrocarbon-containing feed fraction proposed, which is characterized in that at least temporarily relaxed at least a partial stream of the compressed nitrogen-rich fraction after condensation and for the purpose of cooling at least partially, preferably completely evaporated.
- the nitrogen-rich fraction is advantageously compressed to a pressure between 20 and 80 bar and relaxed after condensation to a pressure between 1 and 20 bar.
- At least temporarily, at least a partial flow of the compressed nitrogen-rich fraction is cooled after cooling and for the purpose of cooling at least partially, preferably completely evaporated.
- the above-described compressor C is no longer used exclusively for the described purpose of use - generation of one or more return streams - but is also used for cooling.
- the cooling power generated according to the invention is advantageously used to be able to deliver the rectified fractions obtained as liquid products.
- the methane content of the rectified nitrogen-rich fraction is less than 1% by volume
- the nitrogen content of the rectified methane-rich fraction is less than 5% by volume
- the rectification separation of the feed fraction in a double column consisting of a pre-separation column and a low-pressure column, takes place in the upper region of the pre-separation column, preferably above the uppermost bottom of the pre-separation column
- a partial flow of the compressed nitrogen-rich fraction can be withdrawn after cooling in the heat exchanger E1 and relaxed in the expansion turbine X cold performance.
- the expanded partial stream is then fed via line 15 'also the nitrogen-rich fraction in line 4' and heated in the heat exchanger E1 for the purpose of cooling.
- the additional cooling capacity is increased.
- the withdrawn via line 15 from the heat exchanger E1 partial stream of the compressed nitrogen-rich fraction in the expansion turbine X can be expanded to a higher pressure, and warmed in a separate passage of the heat exchanger E1 and then an intermediate stage of the compressor C are supplied.
- the methane-rich fraction withdrawn via line 5 from the bottom of the low-pressure column T2 can also be initially subcooled in the heat exchanger E2 and discharged via line 21 and valve i.
- the compressor C can now be utilized optimally regardless of the nitrogen concentration in the feed fraction at any time. Especially with time-increasing nitrogen content in the feed fraction, the investment in the compressor is not worthless in the long run, but fulfills the additional, economically useful task of integrated LNG and / or LIN production.
- the possible LNG and / or LIN production is smaller than at high nitrogen content.
- the installed compressor capacity is therefore chosen according to an optimized product range over the lifetime of the system.
- the methane-rich fraction not yet completely vaporized which is withdrawn from the heat exchanger E2 via line 5 ', is not fed directly to the heat exchanger E1, but to a circulation container D. Only the liquid fraction of the methane-rich fraction which accumulates in the circulating tank D and which is fed to the heat exchanger E1 via line 6 is partially evaporated in the heat exchanger E1 and then fed again to the circulation tank D via line 6 '. The withdrawn via line 7 at the top of the circulating tank D, fully evaporated methane-rich overhead product is then in Heat exchanger E1 overheats before it is withdrawn via line 7 'from the process.
- the process control of the methane-rich fraction within the heat exchanger E1 is locally defined by dividing the path into an evaporation section and an overheating section.
- the evaporation of the methane-rich fraction now takes place exclusively in the section of the heat exchanger E1, which is connected via line 6 to the sump of the circulating tank D.
- a helium-rich fraction 8 is withdrawn in the upper region of the pre-separation column T1, preferably above the uppermost bottom of the pre-separation column T1 and by means of the valve c in the low-pressure column T2, preferably in the head region of the low-pressure column T2, is relaxed.
- This embodiment of the method according to the invention has the advantage in helium-containing feed fractions that the inert gas helium can be discharged and the effects of operational fluctuations or changes in the helium content in the
- Be used feed fraction by the backwash in the low-pressure column T2 are attenuated and not directly lead to contamination of the nitrogen-rich (product) fraction with an increased methane content.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL09759662T PL2347206T3 (pl) | 2008-11-06 | 2009-11-03 | Sposób oddzielania azotu |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008056196A DE102008056196A1 (de) | 2008-11-06 | 2008-11-06 | Verfahren zum Abtrennen von Stickstoff |
PCT/EP2009/007879 WO2010051971A2 (de) | 2008-11-06 | 2009-11-03 | Verfahren zum abtrennen von stickstoff |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2347206A2 true EP2347206A2 (de) | 2011-07-27 |
EP2347206B1 EP2347206B1 (de) | 2015-09-09 |
Family
ID=42096380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09759662.1A Active EP2347206B1 (de) | 2008-11-06 | 2009-11-03 | Verfahren zum abtrennen von stickstoff |
Country Status (8)
Country | Link |
---|---|
US (1) | US20110209498A1 (de) |
EP (1) | EP2347206B1 (de) |
AU (1) | AU2009313087B2 (de) |
DE (1) | DE102008056196A1 (de) |
MX (1) | MX2011004358A (de) |
PL (1) | PL2347206T3 (de) |
RU (1) | RU2514804C2 (de) |
WO (1) | WO2010051971A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4145076A3 (de) * | 2021-09-02 | 2023-05-24 | Air Products and Chemicals, Inc. | Integrierte stickstoffabstossung zur verflüssigung von erdgas |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3034428B1 (fr) * | 2015-04-01 | 2020-01-10 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procede de desazotation du gaz naturel a haut debit |
FR3048074B1 (fr) * | 2016-02-18 | 2019-06-07 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Methode pour eviter l'evaporation instantanee de gaz naturel liquefie en cours de transport. |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3874184A (en) * | 1973-05-24 | 1975-04-01 | Phillips Petroleum Co | Removing nitrogen from and subsequently liquefying natural gas stream |
US5141544A (en) * | 1991-04-09 | 1992-08-25 | Butts Rayburn C | Nitrogen rejection unit |
FR2682964B1 (fr) * | 1991-10-23 | 1994-08-05 | Elf Aquitaine | Procede de deazotation d'un melange liquefie d'hydrocarbures consistant principalement en methane. |
GB2297825A (en) * | 1995-02-03 | 1996-08-14 | Air Prod & Chem | Process to remove nitrogen from natural gas |
GB2298034B (en) * | 1995-02-10 | 1998-06-24 | Air Prod & Chem | Dual column process to remove nitrogen from natural gas |
MY114649A (en) * | 1998-10-22 | 2002-11-30 | Exxon Production Research Co | A process for separating a multi-component pressurized feed stream using distillation |
MY117066A (en) * | 1998-10-22 | 2004-04-30 | Exxon Production Research Co | Process for removing a volatile component from natural gas |
DE10215125A1 (de) * | 2002-04-05 | 2003-10-16 | Linde Ag | Verfahren zum Abtrennen von Stickstoff aus einer Stickstoff-enthaltenden Kohlenwasserstoff-reichen Fraktion |
GB0216537D0 (en) * | 2002-07-16 | 2002-08-28 | Boc Group Plc | Nitrogen rejection method and apparatus |
US6978638B2 (en) * | 2003-05-22 | 2005-12-27 | Air Products And Chemicals, Inc. | Nitrogen rejection from condensed natural gas |
FR2891900B1 (fr) * | 2005-10-10 | 2008-01-04 | Technip France Sa | Procede de traitement d'un courant de gnl obtenu par refroidissement au moyen d'un premier cycle de refrigeration et installation associee. |
RU2296922C1 (ru) * | 2006-03-31 | 2007-04-10 | ООО Производственный кооператив Научно-производственная фирма "ЭКИП" | Способ получения чистого метана (варианты) |
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2008
- 2008-11-06 DE DE102008056196A patent/DE102008056196A1/de not_active Withdrawn
-
2009
- 2009-11-03 WO PCT/EP2009/007879 patent/WO2010051971A2/de active Application Filing
- 2009-11-03 MX MX2011004358A patent/MX2011004358A/es active IP Right Grant
- 2009-11-03 EP EP09759662.1A patent/EP2347206B1/de active Active
- 2009-11-03 RU RU2011122689/06A patent/RU2514804C2/ru active
- 2009-11-03 AU AU2009313087A patent/AU2009313087B2/en active Active
- 2009-11-03 PL PL09759662T patent/PL2347206T3/pl unknown
- 2009-11-03 US US13/127,900 patent/US20110209498A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
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See references of WO2010051971A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4145076A3 (de) * | 2021-09-02 | 2023-05-24 | Air Products and Chemicals, Inc. | Integrierte stickstoffabstossung zur verflüssigung von erdgas |
Also Published As
Publication number | Publication date |
---|---|
RU2514804C2 (ru) | 2014-05-10 |
AU2009313087B2 (en) | 2015-12-10 |
DE102008056196A1 (de) | 2010-05-12 |
RU2011122689A (ru) | 2012-12-20 |
MX2011004358A (es) | 2011-05-23 |
EP2347206B1 (de) | 2015-09-09 |
AU2009313087A1 (en) | 2010-05-14 |
WO2010051971A3 (de) | 2012-08-30 |
US20110209498A1 (en) | 2011-09-01 |
PL2347206T3 (pl) | 2016-02-29 |
WO2010051971A2 (de) | 2010-05-14 |
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