海水による二酸化炭素の吸収に関する研究(商船・理工学)

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 and pure water was experimentally studied under various pressures and temperatures to evaluate the solubilities of CO_2 in seawater. The solubilities of CO_2 in seawater and pure water were measured by the change in pressure due to absorption at pressures up to 1500 kPa and temperatures ranging from 20℃ to 60℃. We found that the solubilities of CO_2 were between 0.27×10^<-3> and 5.45kakeru×10^<-3> in seawater, and between 0.26×10^<-3> and 0.6×10<-3> in pure water 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 200 Mpa at a temperature of 20℃ in seawater under 500 kPa, and increased with an increase in temperature. The solubility of CO_2 in seawater was lower than that in pure water. We obtained empirical correlations for solubilities of CO_2 in seawater and pure water at various temperatures under atmospheric pressure, based on the experimental data.
2005-07-31