CO₂ hydrate formation at atmospheric pressure using high efficiency absorbent and surfactants

CO₂ hydrate slurry can be used in a lot of practical applications such as CO₂ capture, CO₂ storage-transportation and CO₂ sequestration processes. However, CO₂ hydrate slurry is generally formed at low temperature and high pressure. The objectives of this study are to develop new absorbents to form CO₂ hydrate at atmospheric pressure, and to evaluate the effects of surfactants and additives on the formation rate and the induction time of CO₂ hydrate. THF (Tetrahydrofuran) is used as a surfactant and SDS (Sodium dodecyl sulfate) and nano particles such as Al₂O₃ are used as the additives. It is found that the maximum CO₂ hydrate formation rate is enhanced up to 3.74 times by adding 0.6wt% of SDS and 0.2wt% of Al₂O₃ nanoparticles compared to the formation rate without the surfactants. Finally, it is concluded that THF 10wt% and SDS 0.6wt% with Al₂O₃ 0.2wt% is the optimum condition for CO₂ hydrate formation rate enhancement.