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Enthalpy and Solubility Data of H2S in Water at Conditions of Interest for Geological Sequestration

Abstract : The dissolution of hydrogen sulfide in water was studied by measuring the heat of mixing ¢Hmix at conditions of interest for geologic storage of acid gases in deep aquifers. The measurements were performed with a new mixing unit equipped with a Hastelloy tubing, developed specifically for an isothermal differential heat flux calorimeter of Setaram. The heats of mixing were determined at target temperatures of 323, 353, and 393 K and pressures up to 31 MPa in the regions where the solution is unsaturated or saturated by H2S, that is, gaseous, liquid, or supercritical states. The concentration dependence of ¢Hmix allowed the simultaneous determination of the limiting enthalpy of solution ¢Hsol and the gas solubility limit. The agreement between our solubility results and the data from the direct phase equilibrium measurements reported in literature was good. Although no calorimetric data exist for verifying the correctness of ¢Hsol values, their internal consistency was tested by conversion to the low pressure enthalpies of hydration ¢Hhyd. These values agreed reasonably well with those derived from the temperature derivative of the Henry's law constants calculated from representative correlations in the literature. The solubility and enthalpic data for aqueous H2S as a function of temperature and pressure were compared with analogous data for CO2 in water that we have published earlier.
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https://hal.archives-ouvertes.fr/hal-00265929
Contributor : Jean-Yves Coxam <>
Submitted on : Thursday, March 20, 2008 - 3:23:23 PM
Last modification on : Thursday, January 11, 2018 - 6:16:14 AM

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Diana Koschel, Jean Yves Coxam, Vladimir Majer. Enthalpy and Solubility Data of H2S in Water at Conditions of Interest for Geological Sequestration. Industrial and engineering chemistry research, American Chemical Society, 2007, 46, pp.1421-1430. ⟨10.1021/ie061180⟩. ⟨hal-00265929⟩

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