Hydrothermally engineered enhanced hydrate formation for potential CO2 capture applications

Abstract

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.