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Accurate thermodynamic model for the calculation of H2S solubility in pure water and brines

by Zhenhao Duan, Rui Sun, Rong Liu, Chen Zhu
Energy and Fuels ()
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A thermodynamic model calculating the solubility of hydrogen sulfide (H2S) in pure water and in aqueous NaCl solutions (0-6M,273-500 K, 0-200 bar) is presented. The model is based on a specific particle interaction theory for the liquid phase and a highly accurate equation of state for the vapor phase. With this specific interaction approach, this model is able to predict H2S solubility in other systems, such as H2S- H2O-Na2SO4,H2S-H2O-CaCl2,H2S-H2O-KCl, and H2S-seawater, without fitting experimental data from these systems. Comparison of the model predictions with experimental data indicates that the model is within or close to experimental uncertainty, which is about 7% in H2S solubility. The model is programmed and can be downloaded from the website: Online calculation is also made available on the website: The H2S solubility model can be used together with numerical speciation-solubility modeling codes such as PHREEQC to calculate sulfide mineral solubility in H2S saturated brines. An example calculation for galena solubility is given. 1.

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