258871 Solubility of CO2 in Saline Water and Adsorption of CO2 On Clay Minerals From Subcritical to Supercritical Conditions
As carbon dioxide is well-known as a major contributor to greenhouse effect, capturing and sequestering CO2 emission has emerged as one of the most important global issues. CO2 storage in geological formations has been focused as a promising method to reduce anthropogenic CO2 emission and especially, saline aquifers have the highest capacity for CO2 storage. For this reason, the evaluation of the storage capacity and interaction was required between saline water and CO2 and between constituent rocks and CO2. Clay mineral is one of the major constituents of various rocks such as cap rock and coal mineral matter.
In this study, CO2 sorption experiments were conducted to confirm the sealing integrity, and the storage capacity of CO2 in the saline water was measured. Several kinds of clay minerals were selected as adsorbents, and CO2 adsorption experiments were carried out by a gravimetric method. According to the practical reservoir conditions, the experiments were performed from CO2 subcritical and supercritical conditions. The structural and textural changes of clay minerals due to CO2 sorption were observed by comparing the BET analysis between the raw material and post-experiment samples. In addition, the solubility experiments of CO2 in the standard sea water were conducted and the change of pH with pressure was observed.
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