Enthalpy and solubility data of CO2 in water and NaCl(aq) at conditions of interest for geological sequestration

摘要: Abstract The transfer of acid gases in saline aquifers under high pressures is an important step their geological storage. dissolution carbon dioxide water and aqueous solution sodium chloride was studied by measuring the heat mixing ΔHmix a supercritical gas with liquid phase. measurements were carried out using new customized unit developed for isothermal differential flux calorimeter Setaram BT 2.15D. experimental technique specifically adapted (H2S, CO2) salt solutions. heats measured at temperatures 323.1–373.1 K, up to 20 MPa regions where unsaturated saturated gas. concentration dependence allowed derive simultaneously limiting enthalpy ΔHsol solubility limit. influence temperature, pressure (up 3 molal) on limits enthalpies examined. salting effect, as Setchenov constant, does not vary strongly pressure, or electrolyte concentration. consistency between our results literature data verified. reasonable agreement suggests that this technique, beside being reliable source data, also suitable indirect determination limits.