Characteristics of CO2 Hydrates

Different from most gas hydrate formers, CO2 is not hydrophobic. At 273 K, the solubility of CO2 in water varies between 0.08 and 1.46 mol/L with the partial pressure of CO2 between 0.1 and 3.4 MPa [14]. The dissolution of CO2 in water produces species including dissolved unhydrated CO2, hydrated CO2, H2CO3, HCO3-, and CO.  

Representing the hydrates composition, the hydration number of si hydrates can be obtained from the equation 

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This chapter provides a comprehensive overview of the fundamentals and applications of CO2 hydrates. Section 10.2 focuses on the microscopic perspective, looking into how gas hydrates form, the three structures of gas hydrates, and the characteristics of CO2 hydrates. From there onwards, the text focuses specifically on CO2 hydrates. The physical properties of CO2 hydrates are considered in Sect. 10.3. Section 10.4 deals with the phase equihbrium of CO2 hydrate. Experimental methods and the phase diagram are showed in this section. The last section covers the applications of CO2 hydrates, including the formation and dissociation of CO2 hydrates, ocean sequestration, the CH4 replacement in hydrates by CO2, and the use of CO2 hydrates in the refrigeration process. 

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