823 二酸化炭素の海洋処理に関する基礎的研究(GS-9 環境工学,研究発表講演)

概要

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Carbon dioxide (CO_2) ocean sequestration technologies, such as dissolution into seawater, are important to promote protection of the global environment. In this study, the solution process of CO_2 gas in seawater was experimentally studied under various pressures and temperatures to evaluate the solubility of CO_2 in ocean. The solubility of CO_2 in seawater was measured by a change in pressure due to absorption at pressures up to 2000 kPa and the temperatures ranged from 4℃ to 60℃. It was obtained that the solubility of CO_2 was between 0.27×10^<-3> and 8.77×10^<-3> in seawater near atmospheric pressure. They increase with an increase in pressure, but decrease with an increase in temperature. The Henry's law constant of CO_2 was about 120 MPa at a temperature of 4℃ in seawater under atmospheric pressure, and increased with an increase in temperature. The solubility of CO_2 in seawater was lower than that in pure water. We obtained empirical correlation for solubility of CO_2 in seawater at various pressures and temperatures, based on the experimental data.
2005-03-18