CO_2 Solubility into Water with Clathrate Hydrate

Abstract

Sequestration of liquid CO_2 into intermediate depth ocean or underground has been considered as a means to reduce atmospheric concentration of the greenhouse gas and to mitigate global warming. The solubility of CO_2 into pure water was investigated under high pressure (7-12MPa) condition. Temperature was varied between 3∿20 Celsius degree. CO_2 clathrate hydrate film was formed in lower temperature. Saturated concentrations of CO_2 were determined by expanding dissolved gas. Even with the clathrate sometimes the solubility was quite large as same as without the clathrate, however, it seemed not exactly equilibrium. The solubility decreased with decreasing temperature and with decreasing pressure, though S. Yang, et al. reported it was smaller with higher pressure condition in some lower temperature condition.