Preservation of carbon dioxide clathrate hydrate coexisting with sucrose under domestic freezer conditions

We report an experimental study of the preservation of CO₂ hydrate in the presence of sucrose. We measured the mass fraction of CO ₂ hydrate coexisting with sucrose for three weeks. The CO₂ hydrate sample was produced from an aqueous solution of sucrose with a mass fraction of 0.16 or 0.12. The particle sizes of the samples were 5.6-8.0 mm and 1.0 mm. The samples were stored at 253 or 258 K under atmospheric pressure. It was found that preservation of the CO₂ hydrate was better for the lower sucrose mass fraction and lower temperature. The effect of particle size was not clearly observed. The mass fractions of CO₂ hydrate in the samples at the end of three weeks exceeded 0.02, which is equivalent to carbonated water. These results indicate that CO₂ hydrate coexisting with sucrose can be stored for three weeks under domestic freezer conditions.