Solubility of hydrogen sulfide in aqueous solutions of N-methyldiethanolamine at high pressures

Negar Sadegh, Kaj Thomsen, Even Solbraa, Eivind Johannessen, Gunn Iren Rudolfsen, Ole Johan Berg

Research output: Contribution to journalJournal articleResearchpeer-review


A static-analytic method was used to measure the H2S solubility in 50 wt% MDEA and in presence of methane as a makeup gas. The solubility was measured at 7000 kPa total pressure, and at 50 and 70 degrees C, for H2S partial pressures from 31 to 974 kPa. Measurements were also performed at 1500 kPa total pressure and 50 degrees C for H2S partial pressure span of 53-386 kPa. The measured data were compared to predictions using the Extended UNIQUAC model. The experimental data showed that the total pressure has a significant effect on H2S solubility in aqueous MDEA. The observed effect is shown to be dominated by the non-ideality of the gas, and it could be predicted by the pressure effect on the fugacity coefficient of H2S in the gas phase. The experimental data from this work are compared and shown to be consistent with earlier published data.
Original languageEnglish
JournalFluid Phase Equilibria
Pages (from-to)33-39
Publication statusPublished - 2015


  • Natural gas
  • MDEA
  • CH4
  • High pressure
  • Extended UNIQUAC

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