Alcohol Amine Method Of Removal Of Hydrogen Sulfide In Natural Gas

In this work, The gas-liquid phase equilibrium data of hydrogen sulfide (H2S) with5.6wt%～11.6wt%MEA,26.3wt%-46.3wt%MDEA, MDEA-MEA, and MDEA-MEA-PZ aqueous solutions were determined in a equilibrated cell under the atmosphere pressure and the temperature in the range of298.15K to333.15K. The experimental partial pressure of Hydrogen Sulfide was varied from0.358to49.491kPa. The equilibrium composition of both liquid and vapor phases were determined by the method of Iodometric Titration. The results showed that the partial pressure of H2S increases with increasing liquid loading (what is defined as the molar ratio of H2S and amines)by keeping the experimental temperature, pressure and the concentration of the amine unchanged. The partial pressure of H2S increases with increasing temperature when keeping the liquid loading, pressure and the concentration of the amine unchanged. Athermodynamic model is used to correlated the experimental GLE equilibrium data. Liquid phase non-idealities are accounted by the electrolyte-NRTL equation treating both long-range electrostatic interactions and short-range binary interactions between liquid phase species, while vapor phase non-idealities are accounted by the SRK Equation of State. The calculated partial pressures of H2S are in good agreement with experimental data and the average deviation error is less than5%.