EP1902118A2 - Procede et dispositif d'absorption de gaz acide dans du gaz naturel - Google Patents

Procede et dispositif d'absorption de gaz acide dans du gaz naturel

Info

Publication number
EP1902118A2
EP1902118A2 EP06753798A EP06753798A EP1902118A2 EP 1902118 A2 EP1902118 A2 EP 1902118A2 EP 06753798 A EP06753798 A EP 06753798A EP 06753798 A EP06753798 A EP 06753798A EP 1902118 A2 EP1902118 A2 EP 1902118A2
Authority
EP
European Patent Office
Prior art keywords
separator
detergent
column
stripping
gas
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.)
Withdrawn
Application number
EP06753798A
Other languages
German (de)
English (en)
Inventor
Johannes Menzel
Martin Cosfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Uhde GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Uhde GmbH filed Critical Uhde GmbH
Publication of EP1902118A2 publication Critical patent/EP1902118A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1462—Removing mixtures of hydrogen sulfide and carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C10L3/101—Removal of contaminants
    • C10L3/102—Removal of contaminants of acid contaminants

Definitions

  • the invention relates to a method and apparatus for the absorption of sour gas from crude natural gas by means of physically acting solvents.
  • Corresponding absorption devices are used for raw natural gases which, in addition to valuable components such as methane, higher hydrocarbons, hydrogen, carbon dioxide and impurities such as hydrogen sulphide, organic sulfur components, such as. Mercaptan and carbon dioxide sulfide, as well as carbon dioxide - where undesirable - and contained small amounts of water vapor in different proportions used.
  • the e.g. sulfur components contained in the raw natural gas for further technical use up to ppm levels from the natural gas to remove.
  • the removal of hydrogen sulphide, mercaptans, carbon dioxide and other sour gas constituents from natural gas is generally accomplished by means of chemically acting absorbents, such as e.g. Amine solutions, alkali salt solutions, etc., or physically acting absorbents, e.g. Selexol, propylene carbonate, N-methyl-pyrrolidone, morphysorb, methanol and the like, in circulatory systems, wherein physically acting absorbents, in contrast to chemically acting detergents, are also able to remove organic sulfur components.
  • the carbon dioxide contained in the gas is either completely, partly or as little as possible removed.
  • the invention solves the problem by
  • the natural gas containing sour gas is first passed into an absorption column, where it is brought into direct contact with the physical detergent, and the physical detergent absorbs the sour gas to a residue, • the loaded detergent is passed under lowering of the working pressure in a first separator in that a part of the dissolved acid gas out of the detergent,
  • the at least one part of the loaded detergent is passed, while the working pressure is lowered again, to a stripping column in which the remainder of the dissolved acid gas is expelled from the detergent,
  • the sour gas leaving the first separator is passed into a further absorption column in which regenerated detergent is used to re-absorb a portion of the outgassed sour gas containing predominantly hydrogen sulfide and to admix it with the laden detergent of the first separator,
  • This stripping gas is used in the stripping column to remove the hydrogen sulfide in the detergent supplied to the stripping column, and
  • the finely regenerated solvent is divided into two sub-streams, one of which is at the downstream of the first separator stage absorption column and the other is passed to the absorption column located in the natural gas stream.
  • the detergent leaving the first separator is passed in lowering the working pressure in a second separator before the still partially loaded detergent is passed to the stripping column.
  • the individual pressure stages are designed so that • the pressure of acid gas absorption above 50 bar, preferably 70 bar is selected,
  • the pressure of the first separator is between 6 and 30 bar, preferably 15 bar
  • the pressure of the stripping column is selected between 0.2 and 3 bar. If a second separator is provided, the pressure of the second separator should be between 1 and 3 bar, preferably 1 bar, but always above the pressure of the stripping column.
  • the fact is taken into account that the physical solvent used has also mitabsorbiert valuable hydrocarbon compounds, which should not be deposited.
  • the first separator is therefore preceded by a recycle gas flash stage, in which a pressure drop of the loaded solvent takes place to a pressure which lies between the pressure of the absorption and that of the first separator, whereby the flash gas released by depressurization and containing absorbed, valuable gas constituents is recycled back to the absorption column by means of a recycle compressor.
  • the loaded solution is preheated by means of a preheater before entering the stripping and leaving the stripping, warm, regenerated solvent in heat exchange with the guided to the preheater, loaded solvent, and then further cooled before This cooled, regenerated solution is used for absorption.
  • the solvent used is a mixture of N-formylmorpholine and N-acetylmorpholine. applies.
  • the invention also includes suitable devices for carrying out the method.
  • the first separator and the absorption column arranged downstream of it on the oxygen gas side form a constructional unit in which the first separator is integrated into the column sump of the absorption column.
  • the second separator and the stripping column form a structural unit in which the second separator is arranged at the top of the stripping column and has a liquid outlet with a device for reducing pressure, further a distributor for liquid in the head region of the stripping column, an inlet for loaded detergent in the bottom region of the column bottom of the stripping column as well as removal devices for sour gas in the top region of the stripping column and in the second separator.
  • Fig. 1 shows the inventive method consisting of an absorption column 2, a first separator 7 with attached absorption column 7a, a second separator 12 and a stripping column 15 and the main process streams.
  • the crude natural gas 1 is passed into the absorption column 2, where it is washed at a pressure of 91 bar with the solvent 3 and leaves it as purified natural gas 4 again.
  • the loaded solvent 5 is depressurized in the pressure relief device 6 to 13 bar and then introduced directly into the bottom of the first separator 7 with attached absorption column 7a. There, a portion of the sour gas is discharged from the loaded solvent and flows into the absorption column arranged above it, where a portion thereof is re-absorbed with fresh solvent 8. In this way, a stripping gas 9 which is poor in H 2 S is formed.
  • the added solvent mixes in the sump with the loaded solvent 5 from the absorption column 2.
  • the withdrawn loaded solvent 10 is relaxed in a further pressure relief device 11 to 1, 1 bar and passed into the second separator 12, where the major part of the acid gas out of the solvent.
  • the still charged with sour gas residues solvent 13 is relaxed in another pressure relief device 14 to 0.6 bar and passed into the stripping column 15, where with the H 2 S-poor stripping gas 9, the remaining sour gas is expelled from the solvent.
  • the thus regenerated solvent 16 is promoted by the solvent pump 17 to the first separator 7 with attached absorption column 7a and the branch to the absorption column 2, and promoted by the latter after further pressure increase in the solvent pump 18 to the top of the absorption column 2.
  • the second separator 12 taken sour gas 19 is combined with the withdrawn from the vacuum pump 21 from the stripping column 15 sour gas stream 20 and fed by means of the conveyor compressor 22 another acid gas utilization 23.
  • Pressure relaxation device first separator a patch absorption column regenerated solvent

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'absorption de gaz naturels sous pression contenant au moins de l'hydrogène sulfuré et du dioxyde de carbone au moyen d'agents d'absorption à action physique. Le gaz naturel contenant du gaz acide est conduit dans une colonne d'absorption dans laquelle il est mis en contact direct avec le détergent physique et ce détergent physique absorbe le gaz acide à l'exception d'un résidu ; le détergent chargé est conduit dans un premier séparateur par réduction de la pression de travail, une partie du gaz acide dissous se dégageant du détergent ; la pression de travail étant à nouveau réduite, la partie du détergent chargé est dirigée sur une colonne de rectification dans laquelle le résidu du gaz acide dissous est désorbé du détergent ; puis le détergent ainsi régénéré est réacheminé au moins partiellement dans la colonne d'absorption. Selon l'invention, le gaz acide sortant du premier séparateur est conduit dans une autre colonne d'absorption dans laquelle une partie du gaz acide dégagé contenant principalement de l'hydrogène sulfuré est réabsorbée avec le détergent régénéré et elle est mélangée au détergent chargé du premier séparateur ; le gaz acide restant qui n'a pas été réabsorbé à partir de la colonne d'absorption placée en aval du premier séparateur est récupéré sous forme de gaz rectifié ; ce gaz rectifié est utilisé dans la colonne de rectification pour éliminer l'hydrogène sulfuré dans le détergent acheminé dans la colonne de rectification ; le solvant régénéré est séparé en deux flux partiels, un de ces flux étant dirigé sur la colonne d'absorption placée en aval du premier séparateur et l'autre sur la colonne d'absorption se trouvant dans le flux de gaz naturel.
EP06753798A 2005-06-27 2006-05-23 Procede et dispositif d'absorption de gaz acide dans du gaz naturel Withdrawn EP1902118A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005030028A DE102005030028A1 (de) 2005-06-27 2005-06-27 Verfahren und Vorrichtung zur Absorption von Sauergas aus Erdgas
PCT/EP2006/004872 WO2007000217A2 (fr) 2005-06-27 2006-05-23 Procede et dispositif d'absorption de gaz acide dans du gaz naturel

Publications (1)

Publication Number Publication Date
EP1902118A2 true EP1902118A2 (fr) 2008-03-26

Family

ID=37074432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06753798A Withdrawn EP1902118A2 (fr) 2005-06-27 2006-05-23 Procede et dispositif d'absorption de gaz acide dans du gaz naturel

Country Status (6)

Country Link
US (1) US20090199712A1 (fr)
EP (1) EP1902118A2 (fr)
CA (1) CA2611600C (fr)
DE (1) DE102005030028A1 (fr)
NO (1) NO20080448L (fr)
WO (1) WO2007000217A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008062387A1 (de) * 2008-12-17 2010-07-01 Uhde Gmbh Verfahren zur Reinigung von technischen Gasen und Gewinnung von Sauergasen
US20100219061A1 (en) * 2009-03-02 2010-09-02 Saudi Arabian Oil Company Enhancement of acid gas enrichment process
DE102009018444A1 (de) * 2009-04-22 2010-10-28 Uhde Gmbh Verfahren zur Entfernung von sauren Gaskomponenten aus einem Gasgemisch
DE102009042365A1 (de) 2009-09-23 2011-04-07 Uhde Gmbh Verfahren und Vorrichtung zur Entfernung von Wasser aus Erdgas oder Industriegasen mit physikalischen Lösungsmitteln
DE102011108749A1 (de) 2011-07-28 2013-01-31 Thyssenkrupp Uhde Gmbh Wärmerückgewinnung bei Absorptions- und Desorptionsprozessen
US8790452B2 (en) 2012-02-22 2014-07-29 Richard Paul Posa Method and system for separating and destroying sour and acid gas

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2685941A (en) * 1951-01-31 1954-08-10 Universal Oil Prod Co Method for concentrating hydrogen
US3362133A (en) * 1965-10-25 1968-01-09 Allied Chem Process for hydrogen sulfide removal from gas mixtures containing h2s and co2
US3594985A (en) * 1969-06-11 1971-07-27 Allied Chem Acid gas removal from gas mixtures
US4359450A (en) * 1981-05-26 1982-11-16 Shell Oil Company Process for the removal of acid gases from gaseous streams
US4397660A (en) * 1981-06-15 1983-08-09 Shell Oil Company Process for the removal of H2 S and CO2 from a gas mixture
DE19753903C2 (de) * 1997-12-05 2002-04-25 Krupp Uhde Gmbh Verfahren zur Entfernung von CO¶2¶ und Schwefelverbindungen aus technischen Gasen, insbesondere aus Erdgas und Roh-Synthesegas
DE19945326B4 (de) * 1999-01-22 2008-03-27 Uhde Gmbh Verfahren zur Entfernung von Kohlendioxid, Schwefelverbindungen, Wasser und aromatischen und höheren aliphatischen Kohlenwasserstoffen aus technischen Gasen
US7192468B2 (en) * 2002-04-15 2007-03-20 Fluor Technologies Corporation Configurations and method for improved gas removal
CN100339150C (zh) * 2002-12-12 2007-09-26 弗劳尔公司 脱除酸性气体的装置和方法
DE10313438A1 (de) * 2003-03-26 2004-11-04 Uhde Gmbh Verfahren zur selektiven Entfernung von Schwefelwasserstoff und CO2 aus Rohgas
DE10324694A1 (de) * 2003-05-28 2004-12-23 Uhde Gmbh Verfahren zur Entfernung von Sauergasen aus unter Druck befindlichem, mit Sauergasverbindungen verunreinigtem Erdgas und Gewinnung der entfernten Sauergase auf erhöhtem Druckniveau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007000217A2 *

Also Published As

Publication number Publication date
DE102005030028A1 (de) 2006-12-28
NO20080448L (no) 2008-01-23
US20090199712A1 (en) 2009-08-13
CA2611600C (fr) 2013-09-24
WO2007000217A2 (fr) 2007-01-04
WO2007000217A3 (fr) 2007-03-15
CA2611600A1 (fr) 2007-01-04

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