Thermodynamic modeling of hydrogen sulfide absorption by aqueous N-methyldiethanolamine using the Extended UNIQUAC model

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Abstract

Aqueous MDEA is the most commonly used solvent for H2S removal from natural gas. A reliable thermodynamic model is required for the proper design of natural gas sweetening processes. In this study, a rigorous thermodynamic model is developed to represent properties of the H2S-MDEA-H2O ternary system. The Extended UNIQUAC model is used to represent the system behavior. The model is created based on models for the constituent binary subsystems. The developed model provides accurate representation of VLE and heat of absorption for the studied system and subsystem in the temperature range of 0-180°C, H2S partial pressure of 0.0033-8329.71kPa, MDEA mass% of 0-50 and loading range of 0-2.17.
Original languageEnglish
JournalFluid Phase Equilibria
Volume392
Pages (from-to)24-32
Number of pages9
ISSN0378-3812
DOIs
Publication statusPublished - 2015

Keywords

  • Extended UNIQUAC
  • H2S
  • MDEA
  • Modeling
  • Natural gas
  • Thermodynamic

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