(179i) Enhanced Kinetics of CO2 Enclathration with a Mixed Organic Layer

Trapping CO2 in hydrates is one of the new technologies for CO2 capture and storage. This work presents the rapid CO2 with a small amount of cyclopentane (CP). The enclathration was carried out in a 474 cm3 non-stirred batch reactor with 100 and 200 cm3 water. At volume ratios of CP to water of 0.01 to 0.1, the maximum enclathration rate is 0.32 mol h-1 at CO2 pressures ranging from 1.9 to 3.4 MPa and at 274 K. CO2 hydrates (sI) and CO2 + CP (sII) binary hydrates coexist at the end of enclathration. The mole ratio of CO2 entrapped in the sI hydrates to that in the sII binary hydrates is higher with 100 cm3 water than with 200 cm3 water. The same trend is also observed for the total amount of CO2 encalthrated. The enclathration rate depends not only on the water volume but also on the pressure. The enclathration rate and the water conversion reach a maximum at 3.06 MPa and then decrease as the pressure increases from 1.9 to 3.4 MPa with 100 cm3 water and 5 cm3 CP. The water conversion to clathrate hydrates reaches 52 % within 2 h. This accelerated enclathration provides one stepping-stone to develop the hydrate-based CO2 capture and storage technique