Hydrate‐Based CO₂ Capture through Nano Dry Gels + Tetrahydrofuran – A Kinetic and Thermodynamic Study

Abstract

The synergic effects of four combinations of nano dry gels plus tetrahydrofuran (THF) on the CO 2 capture and hydrate phase equilibrium were investigated. It was found that the hydrate phase equilibrium condition was almost identical with the mixture of nano dry gel + THF and THF solution. The gas storage capacity and CO 2 uptake rate increased significantly by THF concentration increment up to 19.06 wt % in the dry gel structure compared to a similar THF solution. The hydrate induction time decreased at higher ratios of THF. The mixture of dry gel + THF acted as a stabilizer during the hydrate dissociation process. Considering the gas storage capacity, kinetics, and thermodynamic promoting effect, a mixture including 19.06 wt % THF was favorable for hydrate-based CO 2 capture compared to the other combinations investigated in this study.

Review on Cooperative Effect of Compound Additives on CO2 Hydrate Formation: Recent Advances and Future Directions

“…Compared with the TBAB, THF, and CP, the TBAB and Al 2 O 3 nanoparticle compound additives can increase the gas absorption of the CO 2 /H 2 hydrate formation by 43.62%, 230.56%, and 173.27%, respectively. Golkhou et al 140 studied the influence of four dry nanogels (i.e., a combination of silica nanoparticles and THF) on the formation characteristics of the CO 2 hydrate, and the data showed that the combination of the 10 wt % silica nanoparticles + 5.56 mol % THF was the most beneficial to hydrate formation. In addition, Bozorgian et al 141 compared the effects of alkyl polyglycoside (APG), Al 2 O 3 nanoparticles, and TBAC on the storage capacity of the CO 2 hydrate formation and found that the combination of the Al 2 O 3 nanoparticles and TBAC improved the gas storage capacity.…”