DE102011109234A1 - Liquefaction of methane-rich gas e.g. natural gas, involves cooling methane-rich gas, liquefying, separating low boiling component, compressing, cooling and storing - Google Patents
Liquefaction of methane-rich gas e.g. natural gas, involves cooling methane-rich gas, liquefying, separating low boiling component, compressing, cooling and storing Download PDFInfo
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- DE102011109234A1 DE102011109234A1 DE102011109234A DE102011109234A DE102011109234A1 DE 102011109234 A1 DE102011109234 A1 DE 102011109234A1 DE 102011109234 A DE102011109234 A DE 102011109234A DE 102011109234 A DE102011109234 A DE 102011109234A DE 102011109234 A1 DE102011109234 A1 DE 102011109234A1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 238000009835 boiling Methods 0.000 title claims abstract description 37
- 239000007789 gas Substances 0.000 title claims description 99
- 238000001816 cooling Methods 0.000 title claims description 13
- 239000003345 natural gas Substances 0.000 title claims description 6
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000003507 refrigerant Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 13
- 230000014759 maintenance of location Effects 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 14
- 239000002826 coolant Substances 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 4
- 206010016352 Feeling of relaxation Diseases 0.000 description 3
- 238000004781 supercooling Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 241001295925 Gegenes Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 230000002211 methanization Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
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- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
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- F25J1/0055—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream originating from an incorporated cascade
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- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
- F25J1/0212—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a single flow MCR cycle
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- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0235—Heat exchange integration
- F25J1/0237—Heat exchange integration integrating refrigeration provided for liquefaction and purification/treatment of the gas to be liquefied, e.g. heavy hydrocarbon removal from natural gas
- F25J1/0238—Purification or treatment step is integrated within one refrigeration cycle only, i.e. the same or single refrigeration cycle provides feed gas cooling (if present) and overhead gas cooling
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- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
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- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
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- F25J2205/00—Processes or apparatus using other separation and/or other processing means
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- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
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- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
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- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
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Abstract
Description
Die Erfindung betrifft ein Verfahren zum Verflüssigen eines Methan-reichen Gases, insbesondere von Erdgas, das wenigstens eine leichter als Methan siedende Komponente, insbesondere Helium, Wasserstoff, Kohlenmonoxid und/oder Stickstoff aufweist, wobei
- a) das Methan-reiche Gas gegen wenigstens ein Kältemittel und/oder wenigstens ein Kältemittelgemisch abgekühlt und verflüssigt,
- b) die Methan-reiche Flüssigkeit einer Abtrennung von leichter siedenden Komponenten unterworfen,
- c) die Methan-reiche Flüssigkeit in einen Lagerbehälter entspannt und
- d) das in dem Lagerbehälter anfallendes Boil-off-Gas verdichtet und zumindest teilweise dem zu verflüssigenden Methan-reichen Gas zugemischt wird.
- a) the methane-rich gas is cooled and liquefied against at least one refrigerant and / or at least one refrigerant mixture,
- b) subjecting the methane-rich liquid to separation of lower boiling components,
- c) the methane-rich liquid is released into a storage container and
- d) the accumulated in the storage tank Boil-off gas is compressed and at least partially admixed to be liquefied methane-rich gas.
Methan-reiche Gase, wie bspw. Erdgas, Synthesegas nach Methanisierung, Kokereigas nach Methanisierung, etc. erfordern ab einem gewissen Anteil leichter siedender Komponenten – hierunter seien nachfolgend insbesondere Helium, Wasserstoff, Kohlenmonoxid und/oder Stickstoff zu verstehen – bei ihrer Verflüssigung geeignete Maßnahmen zur Ausschleusung dieser Leichtsieder, da diese im Falle der Verflüssigung von Erdgas üblicherweise unter für LNG-Anlagen üblichen Bedingungen nicht gemeinsam mit Methan verflüssigt werden können.Methane-rich gases, such as, for example, natural gas, synthesis gas after methanization, coking gas after methanation, etc. require from a certain proportion of low-boiling components - this being understood below in particular helium, hydrogen, carbon monoxide and / or nitrogen - in their liquefaction suitable measures for the discharge of these low boilers, since they can not be liquefied together with methane in the case of liquefaction of natural gas usually under conditions usual for LNG plants.
Ein gattungsgemäßes Verfahren zum Verflüssigen eines Methan-reichen Gases – wie es bspw. in dem
Daher lösen sich in der aus dem Abscheider abgezogenen Flüssigphase leichter siedende Komponenten, die bei der nachfolgenden Entspannung auf den Druck des Lagerbehälters ausgasen.Therefore, in the liquid phase withdrawn from the separator, lower-boiling components dissolve, which outgas in the subsequent expansion to the pressure of the storage container.
Um ein stetig wachsendes Ansammeln leichter siedender Komponenten im Lagerbehälter zu verhindern, werden diese zusammen mit durch Wärmeeinfall entstehendem Gasen (Boil-off-Gas) und ggf. beim Verladen des Flüssigprodukts aus einem Transporttank zurückströmendem Gas (Tank-return-Gas) in einem Verdichter auf den Eingangsdruck des zu verflüssigenden Methan-reichen Gases verdichtet, diesem zugemischt und nach erfolgter Verflüssigung erneut der Ausschleusung leichter siedender Komponenten in dem vorbeschriebenen Abscheider zugeführt. Die vorbeschriebene Verfahrensführung erfordert in der Regel eine mehrstufige Verdichtung und vergrößert die dem Verflüssigungsprozess unterworfene Gasmenge.In order to prevent a steadily increasing accumulation of low-boiling components in the storage container, these are combined with heat arising from heat bubbles (boil-off gas) and possibly when loading the liquid product from a transport tank back-flowing gas (tank-return gas) in a compressor compressed to the inlet pressure of the methane-rich gas to be liquefied, this mixed and fed again after liquefaction of the discharge of lower boiling components in the above-described separator. The above-described process control usually requires a multi-stage compression and increases the amount of gas subjected to the liquefaction process.
Aufgabe der vorliegenden Erfindung ist es, ein gattungsgemäßes Verfahren zum Verflüssigen eines Methan-reichen Gases anzugeben, das die vorgenannten Nachteile vermeidet.Object of the present invention is to provide a generic method for liquefying a methane-rich gas, which avoids the aforementioned disadvantages.
Zur Losung dieser Aufgabe wird ein gattungsgemäßes Verfahren zum Verflüssigen eines Methan-reichen Gases vorgeschlagen, das dadurch gekennzeichnet ist, dass
- e) die Methan-reiche Flüssigkeit unmittelbar nach ihrer Verflüssigung in den Lagerbehälter entspannt,
- f) das Boil-off-Gas verdichtet und getrennt von dem zu verflüssigenden Methan-reichen Gas abgekühlt,
- g) das abgekühlte Boil-off-Gas einer Abtrennung der leichter siedenden Komponenten unterworfen und
- h) die bei der Abtrennung der leichter siedenden Komponenten anfallende Methan-reiche Flüssigfraktion dem Lagerbehälter zugeführt wird.
- e) the methane-rich liquid is released into the storage container immediately after it has been liquefied,
- f) the boil-off gas is compressed and cooled separately from the methane-rich gas to be liquefied,
- g) subjecting the cooled boil-off gas to a separation of the lower boiling components and
- h) the resulting in the separation of the lower boiling components methane-rich liquid fraction is supplied to the storage container.
Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens zum Verflüssigen eines Methan-reichen Gases, die Gegenstände der abhängigen Patentansprüche darstellen, sind dadurch gekennzeichnet, dass
- – das Boil-off-Gas auf einen Druck von maximal 15 bar, vorzugsweise auf einen Druck zwischen 6 und 10 bar verdichtet wird,
- – das Boil-off-Gas zumindest partiell kondensiert wird,
- – das abgekühlte Boil-off-Gas vor der Abtrennung der leichter siedenden Komponenten auf einen Druck, der wenigstens 2 bar, vorzugsweise 5 bar oberhalb des Lagerbehälterdrucks liegt, entspannt wird,
- – sofern das Methan-reiche Gas schwerer als Methan siedende Komponenten enthält, diese schwerer siedenden Komponenten nach einer Vorkühlung des Methan-reichen Gases abgetrennt werden, wobei diese Abtrennung vorzugsweise in einer Rückhaltekolonne erfolgt und dieser Rückhaltekolonne vorzugsweise ein Teilstrom der Methan-reichen Flüssigkeit als Rücklauf aufgegeben wird,
- – die Verflüssigung des Methan-reichen Gases und die Abkühlung des Boil-off-Gases in einem gewickelten Wärmetauscher und/oder einem Plattentauscher erfolgt, und/oder
- – zumindest zeitweilig, vorzugsweise im Teillastbetrieb, ein Teilstrom des abgekühlten Methan-reichen Gases dem verdichteten Boil-off-Gas vor dessen Abkühlung zugemischt wird.
- The boil-off gas is compressed to a maximum pressure of 15 bar, preferably to a pressure of between 6 and 10 bar,
- The boil-off gas is at least partially condensed,
- The cooled boil-off gas is depressurized prior to separation of the lower boiling components to a pressure which is at least 2 bar, preferably 5 bar, above the storage vessel pressure,
- - If the methane-rich gas contains heavier than methane boiling components, these higher boiling components are separated after a pre-cooling of the methane-rich gas, this separation is preferably carried out in a retaining column and this retaining column preferably a partial stream of methane-rich liquid as reflux is given up,
- - The liquefaction of the methane-rich gas and the cooling of the boil-off gas in a wound heat exchanger and / or a plate exchanger takes place, and / or
- - At least temporarily, preferably in part-load operation, a partial stream of the cooled methane-rich gas is added to the compressed boil-off gas before it is cooled.
Erfindungsgemäß wird das Methan-reiche Gas unmittelbar nach seiner Verflüssigung in den Lagerbehälter entspannt und nicht wie bisher zunächst einer Abtrennung leichter siedender Komponenten unterworfen. Das Boil-off-Gas bzw. die Gasphase aus dem Lagerbehälter wird nunmehr getrennt von dem zu verflüssigenden Methan-reichen Gas abgekühlt und vorzugsweise zumindest partiell kondensiert.According to the invention, the methane-rich gas is released immediately after its liquefaction in the storage container and not as previously subjected to a separation of low-boiling components. The boil-off gas or the gas phase from the storage container is now cooled separately from the methane-rich gas to be liquefied and preferably at least partially condensed.
Das Boil-off-Gas muss hierbei vor seiner (erneuten) Abkühlung nicht auf den Eingangsdruck des zu verflüssigenden Methan-reichen Gases – dieser liegt üblicherweise zwischen 25 und 100 bar – verdichtet werden, sondern wird in vorteilhafter Weise lediglich auf einen Druck von maximal 15 bar, vorzugsweise auf einen Druck zwischen 6 und 10 bar verdichtet.The boil-off gas must not be compressed to the inlet pressure of the methane-rich gas to be liquefied - this is usually between 25 and 100 bar - before its (re) cooling, but is advantageously only to a maximum pressure of 15 bar, preferably compressed to a pressure between 6 and 10 bar.
Nach erfolgter Abkühlung und partieller Kondensation wird das Boil-off-Gas auf einen Druck, der wenigstens 2 bar, vorzugsweise 5 bar oberhalb des Lagerbehälterdrucks liegt, entspannt und einer Abtrennung der leichter siedenden Komponenten unterworfen. Die dabei anfallende, an leichter siedenden Komponenten reiche Gasphase wird abgezogen und einer gesonderten Verwendung zugeführt, bspw. als Brenn- oder Fackelgas, während die Flüssigphase dem Lagerbehälter zugeführt wird.After cooling and partial condensation, the boil-off gas is at a pressure which is at least 2 bar, preferably 5 bar above the storage tank pressure, relaxed and subjected to separation of the lower boiling components. The resulting rich in lower boiling components gas phase is withdrawn and fed to a separate use, for example. As fuel or flare gas, while the liquid phase is supplied to the storage container.
Das erfindungsgemäße Verfahren zum Verflüssigen eines Methan-reichen Gases sowie weitere vorteilhafte Ausgestaltungen desselben seien nachfolgend anhand des in der
Das in der
Das in der ersten Wärmetauschersektion E1 abgekühlte Methan-reiche Gas wird über Leitung
Aus dem Kopf der Rückhaltekolonne T1 wird über Leitung
Eine Entnahme von Methan-reicher Flüssigkeit aus dem Lagerbehälter D1 ist mittels der Leitung
Nach Abzug aus der dritten Wärmetauschersektion E3 wird das Boil-off-Gas über Leitung
Über die die Leitungen
Die vorbeschriebene Verfahrensführung entspricht im Wesentlichen einer Rektifikation zwischen leichter siedenden Komponenten und der Methan-reichen Flüssigkeit in zwei Gleichgewichtsstufen – diese sind der Lagerbehälter D1 und der Abscheider D2 – mit einer Rückverflüssigung zwischen den Gleichgewichtsstufen unter erhöhtem Druck. Durch die zweistufige Rektifikation kann die Trennschärfe zwischen leichter siedenden Komponenten und der Methan-reichen Flüssigkeit deutlich gesteigert werden. Dadurch wird der Massenstrom durch den Verdichter C1 stark reduziert. Durch den Verzicht auf eine Rückführung des Boil-off-Gases zu dem zu verflüssigenden Methan-reichen Gas vor dessen Abkühlung kann der Enddruck des Verdichters C1 erheblich verringert werden. Beides führt zu einer deutlichen Reduzierung von Invest- und Betriebskosten für den Verdichter C1.The process described above corresponds essentially to a rectification between lower boiling components and the methane-rich liquid in two equilibrium stages - these are the storage tank D1 and the separator D2 - with a re-liquefaction between the equilibrium stages under elevated pressure. Due to the two-stage rectification, the selectivity between lower-boiling components and the methane-rich liquid can be significantly increased. As a result, the mass flow through the compressor C1 is greatly reduced. By dispensing with recirculation of the boil-off gas to the methane-rich gas to be liquefied before it cools down, the final pressure of the compressor C1 can be considerably reduced. Both lead to a significant reduction of investment and operating costs for the compressor C1.
Nachfolgend sei der bereits erwähnte Kältemittelgemischkreislauf näher erläutert. Er umfasst eine zweistufige Verdichtereinheit C2 und C2', einen dieser Verdichtereinheit vorgeschalteten Abscheider B und zwei den beiden Verdichterstufen nachgeschaltete Abscheider C und D. Das in den drei Wärmetauschersektionen E1 bis E3 gegen das zu verflüssigende Methan-reichen Gas und das abzukühlende Boil-off-Gas verdampfte Kältemittelgemisch wird über Leitung
Die aus dem Abscheider C über Leitung
Letztere wird in der zweiten Wärmetauschersektion E2 abgekühlt, im Ventil V9 kälteleistend entspannt, über Leitung
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- US 5036671 [0003] US 5036671 [0003]
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011109234A DE102011109234A1 (en) | 2011-08-02 | 2011-08-02 | Liquefaction of methane-rich gas e.g. natural gas, involves cooling methane-rich gas, liquefying, separating low boiling component, compressing, cooling and storing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011109234A DE102011109234A1 (en) | 2011-08-02 | 2011-08-02 | Liquefaction of methane-rich gas e.g. natural gas, involves cooling methane-rich gas, liquefying, separating low boiling component, compressing, cooling and storing |
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| Publication Number | Publication Date |
|---|---|
| DE102011109234A1 true DE102011109234A1 (en) | 2013-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE102011109234A Withdrawn DE102011109234A1 (en) | 2011-08-02 | 2011-08-02 | Liquefaction of methane-rich gas e.g. natural gas, involves cooling methane-rich gas, liquefying, separating low boiling component, compressing, cooling and storing |
Country Status (1)
| Country | Link |
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| DE (1) | DE102011109234A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105043011A (en) * | 2014-04-24 | 2015-11-11 | 气体产品与化学公司 | Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Intermediate Feed Gas Separation |
| CN105043014A (en) * | 2014-04-24 | 2015-11-11 | 气体产品与化学公司 | Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Dedicated Reinjection Circuit |
| EP2944902A3 (en) * | 2014-04-24 | 2016-06-08 | Air Products And Chemicals, Inc. | Integrated nitrogen removal in the production of liquefied natural gas using refrigerated heat pump |
| WO2016134815A1 (en) * | 2015-02-26 | 2016-09-01 | Linde Aktiengesellschaft | Method of liquefying natural gas |
| DE102015004125A1 (en) * | 2015-03-31 | 2016-10-06 | Linde Aktiengesellschaft | Process for liquefying a hydrocarbon-rich fraction |
| EP3273194A1 (en) * | 2016-07-21 | 2018-01-24 | Air Products And Chemicals, Inc. | Heavy hydrocarbon removal system for lean natural gas liquefaction |
| WO2020079337A1 (en) * | 2018-10-18 | 2020-04-23 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Installation and method for producing liquefied methane |
| CN111849579A (en) * | 2020-08-21 | 2020-10-30 | 四川科比科油气工程有限公司 | An integrated double-tower ethane recovery device and recovery process |
| WO2021023393A1 (en) * | 2019-08-02 | 2021-02-11 | Linde Gmbh | Process and plant for producing liquefied natural gas |
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|---|---|---|---|---|
| US5036671A (en) | 1990-02-06 | 1991-08-06 | Liquid Air Engineering Company | Method of liquefying natural gas |
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- 2011-08-02 DE DE102011109234A patent/DE102011109234A1/en not_active Withdrawn
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| US5036671A (en) | 1990-02-06 | 1991-08-06 | Liquid Air Engineering Company | Method of liquefying natural gas |
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| CN105043011A (en) * | 2014-04-24 | 2015-11-11 | 气体产品与化学公司 | Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Intermediate Feed Gas Separation |
| EP2944901A3 (en) * | 2014-04-24 | 2016-06-08 | Air Products And Chemicals, Inc. | Integrated nitrogen removal in the production of liquefied natural gas using intermediate feed gas separation |
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