Absorption System Overview in HDS Processes
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Questions and Answers

What is the main purpose of the #3 Hydrogen Desulfurization (HDS) Unit?

  • To produce distillate product (correct)
  • To regenerate and reuse rich amine
  • To compress and return sweetened hydrogen to the Reaction and Separation System
  • To remove hydrogen sulfide impurities from sour gas

    • What is the purpose of the Particulate Filter (13PV-2321A/B/C) in the Lean Amine Subsystem?

  • To remove coalescer fines from entering the amine circuit
  • To regenerate and reuse rich amine
  • To remove suspended solid particles from the lean amine (correct)
  • To remove dissolved contaminants that may cause foaming

    • What is the purpose of the Coalescer (13PV-2320) in the Lean Amine Subsystem?

  • To further remove any debris from the lean amine
  • To remove suspended solid particles from the lean amine
  • To regenerate and reuse rich amine
  • To remove any dissolved contaminants that may otherwise cause foaming of the amine solution (correct)

    • What is the purpose of the #3 HDS Absorber?

    <p>To remove hydrogen sulfide (H2S) from the hydrogen stream (A)</p> Signup and view all the answers

    What is the purpose of the Particulate Filter After Carbon Bed (13PV-2322A/B) in the Lean Amine Subsystem?

    <p>To further remove any debris from the lean amine (C)</p> Signup and view all the answers

    What is the role of the Condensate Pumps East/West (13P-107/108) in the Lean Amine Subsystem?

    <p>To pump condensate from the Condensate Pot (13PV-2315) to the inlet of 13PV-2322A/B (A)</p> Signup and view all the answers

    Which of these is NOT a component of the sour gas entering the #3 HDS Absorber?

    <p>Methyldiethanolamine (MDEA) (D)</p> Signup and view all the answers

    What is the primary function of the Absorber Lean Solvent Pump West/East (13P-109/110)?

    <p>To pump lean amine to the top of the Absorber (D)</p> Signup and view all the answers

    What is the primary difference between the Particulate Filter (13PV-2321A/B/C) and the Particulate Filter After Carbon Bed (13PV-2322A/B)?

    <p>The Particulate Filter After Carbon Bed contains finer micron filtering media. (C)</p> Signup and view all the answers

    What is the name of the stream that exits the bottom of the #3 HDS Absorber?

    <p>Rich amine (A)</p> Signup and view all the answers

    What is the end product of the Lean Amine Subsystem?

    <p>Filtered lean amine (C)</p> Signup and view all the answers

    Why is methyldiethanolamine (MDEA) considered 'lean amine' when it enters the #3 HDS Absorber?

    <p>It has a low concentration of hydrogen sulfide (C)</p> Signup and view all the answers

    Which of the following contaminants are removed by the Coalescer?

    <p>Dissolved contaminants that may cause foaming (A)</p> Signup and view all the answers

    What is the process of transferring hydrogen sulfide from the gas phase to the aqueous phase called?

    <p>Absorption (C)</p> Signup and view all the answers

    What is the function of the Recycle Hydrogen Knock Out (KO) Drum (13PV-2314)?

    <p>To separate water from the sweetened hydrogen (C)</p> Signup and view all the answers

    What is the final destination of the hydrogen gas after it exits the #3 HDS Absorber?

    <p>The #3 HDS Reaction and Separation System (A)</p> Signup and view all the answers

    What is the primary purpose of the Amine Decanter (13PV-2307)?

    <p>To separate vapor from rich amine (C)</p> Signup and view all the answers

    Which of the following streams is NOT routed to the decanter feed?

    <p>Rich amine from the Reformer Rich Amine Header (A)</p> Signup and view all the answers

    Where is the sour gas that exits the Amine Decanter routed?

    <p>To the Flare Header (A)</p> Signup and view all the answers

    What is the purpose of the internal water boot in the #3 HDS Absorber?

    <p>To collect sour water present in the feed streams (C)</p> Signup and view all the answers

    What is the role of the Decanter Pump (13P-111) in the process?

    <p>Pumping rich amine from the Amine Decanter to the Rich Amine Header (B)</p> Signup and view all the answers

    What is the ultimate destination of rich amine after being routed to the Rich Amine Header?

    <p>The Amine Regeneration Unit (ARU) #1/2 or #3/4 (A)</p> Signup and view all the answers

    Which of the following is NOT a source of rich amine that is mixed with the bulk of the rich amine in the Rich Amine Header?

    <p>The Amine Settler (5PV-1615) (A)</p> Signup and view all the answers

    What is the primary function of the Amine Regeneration Unit (ARU)?

    <p>To regenerate rich amine for reuse (C)</p> Signup and view all the answers

    Flashcards

    Absorption System

    A system that removes hydrogen sulfide from sour hydrogen gas using amine absorption technology.

    Sour Hydrogen Gas

    Hydrogen gas that contains toxic hydrogen sulfide impurities.

    Amine Absorption Technology

    A process that uses amine solvents to remove acid gases from gas streams.

    Lean MDEA

    Filtered methyldiethanolamine used as a solvent in hydrogen gas treatment.

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    Rich Amine

    Amine solution saturated with absorbed hydrogen sulfide after the absorption process.

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    Coalescer

    A device that removes dissolved contaminants from lean amine to prevent foaming.

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    Particulate Filter

    A filter that removes suspended solid particles from lean amine to protect downstream equipment.

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    Amine Regeneration Unit (ARU)

    A unit where rich amine is processed to remove contaminants for reuse.

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    Lean amine

    A solvent free of acid gas, used in absorption.

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    Absorber Lean Solvent Pump

    Pumps lean amine to the #3 HDS Absorber for absorption.

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    #3 HDS Absorber

    A 15 tray column that removes H2S from hydrogen gas.

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    Methyldiethanolamine (MDEA)

    A solvent used to absorb hydrogen sulfide due to its affinity.

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    Absorption technology

    A method to remove toxic substances from gas streams using solvents.

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    Recycle hydrogen

    Hydrogen free of H2S, returned for further usage in processes.

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    Amine Decanter (13PV-2307)

    A vertical vessel that separates vapor from rich amine to protect downstream equipment.

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    Sour Water

    Contaminated water containing dissolved gases and impurities, often from chemical processes.

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    Flare Header

    A system used to safely burn off excess gases released from processes.

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    Rich Amine Header

    The main pathway for routing rich amine to regeneration units after separation.

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    Decanter Pump (13P-111)

    A pump used to move rich amine liquid from the decanter to the rich amine header.

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    Study Notes

    Absorption System Overview

    • The #3 Hydrogen Desulfurization (HDS) unit produces distillate using a blend of light distillate, medium distillate, light cycle oil, light coker gas oil, and mixed gas oils from various refinery locations.
    • The Absorption System receives sour hydrogen gas from the #3 HDS Reaction and Separation System.
    • Amine absorption technology removes toxic hydrogen sulfide impurities from the sour gas, producing sweetened hydrogen.
    • Sweetened hydrogen is compressed and returned to the Reaction and Separation System for use in catalytic hydrotreating.
    • Lean methyldiethanolamine (MDEA), filtered and dewatered, is used as a solvent to absorb hydrogen sulfide, creating "rich amine".
    • The sweetened hydrogen, free of acid gas, goes to the #3 HDS Compression system.
    • Rich amine is sent to the Amine Regeneration Unit (ARU) for regeneration and reuse.

    Lean Amine Subsystem

    • The Lean Amine Subsystem prepares lean amine as a solvent for the #3 HDS Absorber.
    • It filters debris from lean amine to prevent foaming.
    • Some filtered lean amine is diverted to the Amine Decanter.
    • Filtered lean amine splits into two streams: one through a coalescer (removing contaminants causing foaming) and the other through a particulate filter.
    • Additional filtering occurs in another particulate filter after the Carbon Bed.
    • Remaining lean amine is routed to the Absorber Lean Solvent Pump for pumping to the #3 HDS Absorber.

    #3 HDS Absorber

    • Sour gas containing hydrogen, hydrogen sulfide (H2S), and ammonia (NH3) enters the #3 HDS Absorber from the Effluent Cold Separator.
    • The 15-tray absorption column uses amine absorption technology to remove H2S from the hydrogen stream.
    • Lean methyldiethanolamine (MDEA), "lean amine", is pumped to the top of the absorber.
    • MDEA absorbs H2S from the gas stream, creating "rich amine".
    • Sweetened hydrogen exits the top of the absorber to the Recycle Hydrogen Knock Out (KO) Drum.
    • Rich amine exits the bottom and is sent to the Amine Regeneration Unit (ARU).
    • A portion of rich amine is sent to the Amine Decanter to remove vapor.
    • Sour water collected in the absorber's internal water boot is drained and combined with other drains.
    • Sour water is separated in the decanter.
    • Sour gas exits to the Flare Header.

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    Related Documents

    Sinclair 3HDS Absorption System PDF

    Description

    Explore the intricacies of the Absorption System used in Hydrogen Desulfurization (HDS) units. This quiz covers the process flow from sour hydrogen gas reception to hydrogen sulfide removal and the preparation of lean amine as a solvent. Test your understanding of amine absorption technology and its role in producing sweetened hydrogen for catalytic processes.

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