Gas solubility of H2S and CO2 in aqueous solutions of N-methyldiethanolamine

P. J. G. Huttenhuis, N. J. Agrawal, J. A. Hogendoorn, G. F. Versteeg

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Abstract

Alkanolamine processes are used in the industry to remove acid gases, like CO2, H2S and other sulphur components, from natural gas and industrial gas streams. In this process the acid components react with the basic alkanolamine solution via an exothermic, reversible reaction in a gas/liquid absorber. The composition of these amine solutions is continuously changed to optimise the (selective) removal of the several acid components. For the design of gas treating equipment accurate mass transfer, reaction kinetics and solubility data of acid gases in aqueous alkanolamine solutions are required. In this paper new solubility data of H2S and CO2 in aqueous MDEA at different conditions encountered in modern gas treating facilities are presented. The experimental pressure and temperature were varied from 6.9 to 69 bar (methane was used as make-up gas) and from 10 to 25 °C respectively. These new solubility data were evaluated and correlated with an Electrolyte Equation of State Model (EOS) as originally proposed by Fürst and Renon [Fürst, W., Renon, H., 1993. Representation of Excess Properties of Electrolyte Solutions Using a New Equation of State. AIChE J., 39 (2), pp. 335.]. The application of Equation of State Models for the prediction of VLE data for reactive, ionic systems is a rather new development in this field.
Original languageEnglish
Pages (from-to)122-134
Number of pages13
JournalJournal of Petroleum Science and Engineering
Volume55
Issue number1
DOIs
Publication statusPublished - 2007

Keywords

  • hydrogen sulfide
  • phase equilibrium
  • solubility
  • equation of state
  • carbon dioxide
  • aqueous solution
  • Solutions
  • Solubility
  • Reaction kinetics
  • Natural gas
  • Mathematical models
  • Mass transfer
  • Equations of state
  • Amines
  • Absorption
  • Natural gas
  • Vapor liquid equilibrium
  • Methyldiethanolamine
  • Alkanolamine
  • Solutions
  • Solubility
  • Mass transfer
  • Mathematical models
  • Reaction kinetics
  • Equations of state
  • Amines
  • Absorption
  • Vapour liquid equilibrium
  • Hydrogen sulphide
  • Chemical absorption
  • Carbon dioxide
  • Alkanolamines

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