Effect of brine on the kinetics of Carbon dioxide hydrate formation and dissociation in porous media

In this paper, the kinetics of CO₂hydrate formation and dissociation was studied experimentally in porous media (quartz sand) to evaluate the effect of brine on CO₂hydrate storage capacity. The experiments were performed using the constant cooling and heating method in a high pressure hydrate reactor at an exprimental formation pressure and temperature of 4 MPa and 274.15 K and dissociation temperature at 277.15 K, respectively. The brine system (3.3 wt% NaCl) was used at 100% saturation for 6.5 cm bed height. The results showed that the disruptive effect of the salt ions in brine on the CO₂hydrate structure in the porous media prolongs the hydrate nucleation time and reduces the CO₂storage capacity by 30% and 32%, respectively. In addition, the presence of brine affects the hydrate dissociation stability by increasing the rate of hydrate dissociation from 0.0127 mol/h to 0.0656 mol/h. The time taken to achieve 90% CO₂release was reduced by 29% in the presence of brine. The results in this work are useful for hydrate-based CO₂storage technology in porous media.