The Effect of Stirrer Speed on the Kinetics of Carbon Dioxide Hydrate Formation: An Experimental Investigation at Speeds of 0 – 10 rpm

Carbon dioxide is one of the most important greenhouse gases that plays a major role in global warming. Gas hydrates are one of the newest technologies available to remove this gas before entering the atmosphere. In this research, the effect of the stirrer speed on the most important kinetic parameters of carbon dioxide hydrate formation, i.e. amount of gas uptake, hydrate growth rate, storage capacity, and water to hydrate conversion percentage in a constant-volume constant-temperature reactor was investigated. The experiments were carried out in the presence of double distilled water at a temperature of 278.15 K and two pressures of 2.9 MPa. Vertical and horizontal stagnant conditions and rocking cell stirrer with speeds of 2, 4 and 10 rpm were used to investigate the effect of stirrer speed on the kinetics of carbon dioxide hydrate formation. The results of the experiments showed that the use of a stirrer promotes the kinetics of carbon dioxide hydrate formation. The use of a stirrer at a speed of 10 rpm increased the amount of gas uptake compared to the vertical and horizontal conditions, respectively, by 84.4 and 78.5 percent. The storage capacity of carbon dioxide hydrate formation increased by 72.6% and 67.7%, respectively, when using a stirrer at a speed of 10 rpm compared to the vertical and horizontal conditions.