Hydrothermally engineered enhanced hydrate formation for potential CO₂ capture applications

Gas hydrate formation is regarded as the emerging technology to mitigate the effect of greenhouse gases. Now a day, the alarming situation of increased CO₂ concentration of about 450 ppm is associated with elevation of earth temperature up to 2°Ϲ. Where the CO₂ hydrate (CO₂.6H₂O) formation is of environmental and scientific interest due to carbon capture and storage (CCS) in order to condense environmental CO₂ concentration. The present study is experimentally addressing the four different sample preparation procedures (method 1, 2, 3 and 4) of stirring for the CO₂ hydrate (CO₂.6H₂O) formation correlated with the integrated gasification combine cycle (IGCC) conditions. A high-pressure volumetric analyzer (HPVA) is used to explore the rate of CO₂ hydrate formation that is critically investigated using pressure-time (P-t) curves for all the prepared samples. The highest stirring (method 4) speed with 37000 rpm, had the highest moisture content of 14.8 wt% as well as at 275 K and 36 bar. By using method 4 hydrate conversion of 40.5 mol% was observed. The high stirring method (method 4) show gas uptake of about 3.9 mmol of carbon dioxide per gram of H₂O and the highest rate for formation of hydrate as 0.05 mmol of carbon dioxide per gram of H₂O per min. Further, comparison of promoter's combination relative to long experiment duration resulted in the increment of 13.82 mol% of water to hydrate conversion in 2600 min at 283 K and 58 bar for T1–5 (having 5.6 mol% of THF and 0.01 mol% of SDS) as compared to the experiment that was performed in 1200 min.