WO2007146611A2 - Optimisation du démarrage d'un système de régénération d'amines grâce à la mise sous pression d'un réservoir de détente - Google Patents

Optimisation du démarrage d'un système de régénération d'amines grâce à la mise sous pression d'un réservoir de détente Download PDF

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Publication number
WO2007146611A2
WO2007146611A2 PCT/US2007/070118 US2007070118W WO2007146611A2 WO 2007146611 A2 WO2007146611 A2 WO 2007146611A2 US 2007070118 W US2007070118 W US 2007070118W WO 2007146611 A2 WO2007146611 A2 WO 2007146611A2
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WO
WIPO (PCT)
Prior art keywords
amine
stream
acid gas
rich
flash tank
Prior art date
Application number
PCT/US2007/070118
Other languages
English (en)
Other versions
WO2007146611A3 (fr
Inventor
Roy Wade Rhodes
Quenten Zane Rhodes
Original Assignee
Newpoint Gas Services, Inc.
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 Newpoint Gas Services, Inc. filed Critical Newpoint Gas Services, Inc.
Priority to MX2008015758A priority Critical patent/MX2008015758A/es
Priority to EP07797952A priority patent/EP2035115A2/fr
Priority to AU2007258038A priority patent/AU2007258038A1/en
Publication of WO2007146611A2 publication Critical patent/WO2007146611A2/fr
Publication of WO2007146611A3 publication Critical patent/WO2007146611A3/fr

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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
    • B01D53/1425—Regeneration of liquid absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/06—Polluted air

Definitions

  • This invention relates to the regeneration of amine used in the processing of natural gas. Specifically, the invention involves novel component configurations to increase ease of startup and operations for the amine regeneration system. Most particularly, the invention relates to an amine regeneration system which includes a process and associated system for direct injection of gas into the flash tank to allow immediate setting of the pressure regulation valve. BACKGROUND OF THE INVENTION
  • Acid gas removal from gas streams is necessary to allow this gas to be used and/or sold into pipeline systems.
  • the removal of sulfur compounds from these acid gasses or "sour gasses” is called “sweetening.”
  • acid gases are removed using an amine-based solvent to absorb the acid gas via various chemical reactions, resulting in the production of a rich amine solvent, which can then be regenerated using heat.
  • Hydrogen sulfide is a toxic gas that must generally be removed to extreme low concentrations (less than 0.25 grains of H 2 S per 100 standard cubic feet) prior to pipeline delivery. When mixed with free water it forms a weak acid that can cause corrosion.
  • Carbon dioxide is a non-toxic inert gas. Carbon dioxide, as such, is harmless in dry natural gas but when mixed with free water will form a weak acid and also cause corrosion.
  • Inlet gas to cryogenic plants that contain concentrations of CO 2 in excess of 0.75 to 1.0 percent CO 2 may cause freezing problems. The CO 2 will freeze to a solid ice in a turbo expander plant demethanizer where it may plug lines and even plug the tower itself. Often flooding of the demethanizer results from carbon dioxide freezing within the tower.
  • the plant inlet gas contains concentrations of carbon dioxide too high to process, all of the gas may be treated or part of the gas may be separated into a side stream and treated by an amine plant. Principally all the carbon dioxide is removed in the amine plant.
  • (b) adsorption In absorption processes, the gas stream contacts a liquid that selectively removes acid gases.
  • the most common absorption process is the amine process.
  • the liquid absorbent is a mixture of water and a chemical anrne, usually monoethanol-amine (MEA) or diethanolamine (DEA).
  • MEA monoethanol-amine
  • DEA diethanolamine
  • Amines remove carbon dioxide and hydrogen sulfide by a chemical reaction that changes the chemical form of both the amine and the acid gases.
  • the new chemical changes the acid gases to a liquid form which is separated from the acid-free gas or sweetened gas.
  • the chemical reaction between amine (called lean amine at the start of the process) and acid gases gives off heat when the reaction takes place.
  • the sweet residue gas flows out the top of a contactor or absorber and the reacted amine (also called rich amine) flows out the bottom and is generally higher in temperature than the inlets.
  • Lean amine is regenerated by reducing the pressure and adding heat to the rich amine.
  • amine-based solvents include secondary and tertiary amines (e.g., diethanolamine [DEA], and/or methyldiethanolamine [MDEA]), which are generally more energy efficient than primary amines due to their lower heat of reaction and lower energy requirements for regeneration.
  • Alternative amine solvents may further include monoethanolamine [MEA], diglycolamine [DGA], triethanolamine [TEA], diisopropylamine, and various combinations thereof, along with one or more additives.
  • U.S. Patent 4,461,749 to Thorn is directed to a method of processing acid gases wherein makeup water is distilled internally in an amine gas treating unit by adding it to the reclaimer used to process a slipstream of lean amine from the stripper.
  • U.S. Patent 4,798,910 to Herrin teaches a method for amine regeneration wherein a rich amine out of a first heat exchanger is temperature controlled prior to transfer to a second heat exchanger. At least a portion of the hot overhead gasses exiting from a stripping still are transferred to the second heat exchanger. Temperature controlled heated rich amine liquid passes through the second exchanger and contacts the hot overhead gasses. The rich amine liquid is increased in higher temperature thereby and then is transferred to yet a third exchanger and finally to the stripping still for regeneration of lean amine. The reduced temperature overhead gasses are transferred to the reflux condenser for final cooling.
  • U.S. Pat. No. 6,071,484 to Dingman, et al. describe a method to produce an ultra lean amine using an ion exchange bed to remove the residual acid gases in the lean amine.
  • U.S. Pat. No. 4,798,910 to Herrin teaches the use of an additional heat exchanger to heat the rich amine solvent using a portion of the heat content in the regenerator overhead gases. This method reduces overhead condenser duty to some degree, however reboiler duty remains largely unaffected, as the amine regeneration process is more strongly dependent on the stripping steam supplied at the bottom of the regenerator.
  • U.S. Pat. No. 3,565,573 to Thirkell teaches a process in which acid gas is treated in a dual-zone absorber to provide a rich solvent that is regenerated in conventional manner.
  • U.S. Pat. No. 3,829,521 to Green et al similarly describe a configuration in which a pre-stripper and a stripper operate in series to remove acid gas from two gas streams.
  • H 2 S hydrogen sulfide
  • CO 2 carbon dioxide
  • Amine plants are typically employed for the removal of the first two contaminants listed (hereto referred to as "acid gas").
  • an amine based solvent is brought in contact with the natural gas stream. The amine adsorbs the acid gas and then the amine is regenerated, which means that the acid gas in the amine is removed so the amine can be reused.
  • the method for regeneration utilizes a reboiler to create steam that comes into contact with the amine.
  • the steam has two purposes: to provide heat that allows the endothermic de-adsorption of the acid gas to occur and to reduce the partial pressure of the acid gas in the vessel. This reduction in partial pressure allows the amine to be regenerated at much higher purities than would otherwise be possible.
  • the amine is then cooled and reused to treat the natural gas.
  • an improved process for amine regeneration is provided via a system including a flash tank, a rich/lean heat exchanger, a still, a reflux condenser, a reflux accumulator, a pump, a reboiler, a flash tank pressurization line, and a valve, thereby enabling an operator to directly inject gas into the flash tank thereby permitting immediate setting of the pressure regulation valve. This reduces down time and provides for more economical plant operation.
  • Figure 1 shows the flow of contaminated amine through its separation into clean amine and acid gas.
  • Figure 2 is a flow diagram of a prior art process absent the flash tank pressurization components of the present invention.
  • a preferred method for optimizing start-up of an amine regeneration system includes the steps of: (a) passing a rich amine input stream through a flash tank wherein a pressure differential enables flashing off of a portion of acid gas from the rich amine input stream, whereby dynamic pressure control of the flash tank is achieved by providing a controlled source of supplemental acid gas to the flash tank; (b) heating the input rich amine stream by passage thereof through a rich/lean heat exchanger to form a heated rich amine stream; (c) releasing acid gas components from the heated rich amine stream by passage of the heated rich amine stream into a still wherein the heated rich amine stream is subjected to an initial steam contact thereby causing it to release acid gas components and form a lean amine stream;
  • a flash tank pressurization assembly comprised of a pressurized acid gas line and associated valving, allows acid gas to be introduced to the flash tank to set the pressure regulation valve which allows acid gas to "flash" out of the amine solution. This pressure cannot be set until enough gas has been released from the amine. The inclusion of this line allows gas to be directly fed into the flash tank without waiting. This reduces startup time and operator effort.
  • the contaminated amine is introduced the flash tank allowing some of the acid gas components to flash off.
  • the amine is then introduced into the rich/lean heat exchanger causing the rich amine to be heated.
  • the rich amine is then introduced into the still where it comes in contact with steam as it goes down through the still.
  • the amine releases the acid gas components which exit the still with the steam and they are carried into the reflux condenser.
  • the steam condenses in the reflux condenser, and then the water stream enters the reflux accumulator where the acid gas exits the system.
  • the condensed water is stored in the reflux accumulator until it is pumped back into the still.
  • the amine exits the still and enters the reboiler where it is heated to release steam which is fed into the still.
  • the fully regenerated amine is passed into the rich/lean heat exchanger where it is cooled and exits the system as fully regenerated amine.
  • the flash tank pressurization line allows the flash tank pressure to be set

Landscapes

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

Abstract

L'invention concerne un système d'optimisation du fonctionnement d'un système de régénération d'amines comprenant un réservoir de détente, un échangeur de chaleur riche/pauvre, un alambic, un condensateur à reflux, un accumulateur à reflux, une pompe, un rebouilleur, et un assemblage de mise sous pression du réservoir de détente.
PCT/US2007/070118 2006-06-09 2007-05-31 Optimisation du démarrage d'un système de régénération d'amines grâce à la mise sous pression d'un réservoir de détente WO2007146611A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
MX2008015758A MX2008015758A (es) 2006-06-09 2007-05-31 Optimizacion de puesta en marcha de sistema de regeneracion de amina utilizando presurizacion del tanque de separacion.
EP07797952A EP2035115A2 (fr) 2006-06-09 2007-05-31 Optimisation du démarrage d'un système de régénération d'amines grâce à la mise sous pression d'un réservoir de détente
AU2007258038A AU2007258038A1 (en) 2006-06-09 2007-05-31 Optimization of amine regeneration system start-up using flash tank pressurization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81205106P 2006-06-09 2006-06-09
US60/812,051 2006-06-09

Publications (2)

Publication Number Publication Date
WO2007146611A2 true WO2007146611A2 (fr) 2007-12-21
WO2007146611A3 WO2007146611A3 (fr) 2008-02-21

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PCT/US2007/070118 WO2007146611A2 (fr) 2006-06-09 2007-05-31 Optimisation du démarrage d'un système de régénération d'amines grâce à la mise sous pression d'un réservoir de détente

Country Status (4)

Country Link
EP (1) EP2035115A2 (fr)
AU (1) AU2007258038A1 (fr)
MX (1) MX2008015758A (fr)
WO (1) WO2007146611A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10646818B2 (en) 2016-07-05 2020-05-12 Ineos Americas, Llc Method and apparatus for recovering absorbing agents in acid gas treatment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798910A (en) * 1985-01-29 1989-01-17 Herrin J Pearman Process sequencing for amine regeneration
US5089034A (en) * 1990-11-13 1992-02-18 Uop Process for purifying natural gas
US6071484A (en) * 1997-01-24 2000-06-06 Mpr Services, Inc. Process for treating gas with ultra-lean amine
US20020007733A1 (en) * 1997-02-11 2002-01-24 David Morrow Raw natural gas processing system and method of processing raw natural gas
US20040060334A1 (en) * 2002-09-27 2004-04-01 Gary Palmer Acid gas enrichment process

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798910A (en) * 1985-01-29 1989-01-17 Herrin J Pearman Process sequencing for amine regeneration
US5089034A (en) * 1990-11-13 1992-02-18 Uop Process for purifying natural gas
US6071484A (en) * 1997-01-24 2000-06-06 Mpr Services, Inc. Process for treating gas with ultra-lean amine
US20020007733A1 (en) * 1997-02-11 2002-01-24 David Morrow Raw natural gas processing system and method of processing raw natural gas
US20040060334A1 (en) * 2002-09-27 2004-04-01 Gary Palmer Acid gas enrichment process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EBENEZER S.: 'Optimization of Amine Base CO2 Removal Process - REMOVAL OF CARBON DIOXIDE FROM NATURAL GAS FOR LNG PRODUCTION' INSTITUTE OF PETROLEUM TECHNOLOGY, NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, [Online] December 2005, XP008101042 Retrieved from the Internet: <URL:http://www.ipt.ntnu.no/-jsg/studenter/prosjekt/Salako2005.pdf> *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10646818B2 (en) 2016-07-05 2020-05-12 Ineos Americas, Llc Method and apparatus for recovering absorbing agents in acid gas treatment
US11433347B2 (en) 2016-07-05 2022-09-06 Ineos Americas, Llc Method and apparatus for recovering absorbing agents in acid gas treatment

Also Published As

Publication number Publication date
WO2007146611A3 (fr) 2008-02-21
AU2007258038A1 (en) 2007-12-21
MX2008015758A (es) 2009-04-30
EP2035115A2 (fr) 2009-03-18

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