Measuring mutual solubility in the H2O–CO2 system up to 200 bar and 100°C by in situ Raman spectroscopy

Abstract : The solubility control in the H2O–CO2system under high pressure is of prime interest in numerousgeochemical systems from hydrothermal fluids to CO2geological storage. However, the number of exper-imental data is scarce in the range of interest of geological storage, especially in the CO2-rich phase. A newexperimental device was built to measure mutual solubility in the CO2–H2O system without samplingby coupling a batch reactor with Raman immersion probes. The system was first calibrated by measuringthe solubility of CO2in water at 100◦C. The results were provided with an accuracy of a few % between40 bar and 200 bar and in agreement with other published experimental data sets and models. The lin-ear correlation between Raman peak intensity and CO2solubility in the aqueous phase was then usedto provide new experimental data of CO2solubility in water at 65◦C from 3 bar to 200 bar. The Ramandata of the CO2-rich phase or supercritical phase are compared to a thermodynamic models and the fewexperimental data available in literature to provide a new data set of H2O–CO2mutual solubility at 100◦Cand up to 200 bar.
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Marie-Camille Caumon, Jérôme Sterpenich, Aurélien Randi, Jacques Pironon. Measuring mutual solubility in the H2O–CO2 system up to 200 bar and 100°C by in situ Raman spectroscopy. International Journal of GreenhouseGas Control, 2016, 47, pp.63-70. ⟨10.1016/j.ijggc.2016.01.034⟩. ⟨hal-01343083⟩

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