2002•The Proceedings of the Thermal Engineering ConferenceOpen access

Solubility measurement of supercritical carbon dioxide in sodium chloride solution

Shigeru Bando, Fumio Takemura, Masahiro Nishio, Eiji Hihara, Makoto Akai

Abstract

Geological storage of carbon dioxide (CO_2) has been investigated as an option for reducing the concentration of CO_2 into the atmosphere. When the possibility of geological storage technique is discussed, it is important to estimate the total amount of stored CO_2. And it required information about the thermophysical properties, such as solubility. Measurement of the solubility of CO_2 in pure water has been studied, whereas that in solutions that include an electrolyte such as sodium chloride (NaCl) has not. In this study, to determine the CO_2 storage capacity at saline aquifers, we measured the solubility of CO_2 in NaCl solution. Based on the results, we determined a prediction equation for the solubility as a function of temperature, pressure, and salinity.

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Key concepts: Solubility, Supercritical carbon dioxide, Carbon dioxide, Chemistry, Electrolyte, Salinity, Supercritical fluid, Sodium