Hydrate Equilibrium Data for CO₂+N₂ System in the Presence of Tetra-n-butylammonium Fluoride (TBAF) and Mixture of TBAF and Cyclopentane (CP)

Abstract

Hydrates can be used for CO 2 capture from flue gases (hydrate crystallization). In this work, hydrate equilibrium data were measured and compared with literature data. The isochoric method was used to determine the gas hydrate dissociation points. Different CO 2 +N 2 gas mixtures were used in the presence of promoters such as tetra-n-butylammonium fluoride (TBAF) and mixtures of TBAF and cyclopentane (CP). The key novel aspect of this work is the use of a combination of promoters, TBAF and CP, which under certain conditions induced further pressure reduction in comparison to pure TBAF results. Concerning experiments with pure promoter, there is good agreement between our results and literature results for different gas mixtures and promoter concentrations.

Experimental Study on the Dissociation Equilibrium of (CH4+ CO2) Hydrates in the (Quartz Sands + NaCl Solution) System

“…The ever-increasing atmospheric CO 2 concentration mainly comes from the burning of fossil fuels . Some researches about CO 2 separation based on the hydrate technology have been reported. , On the other hand, natural gas hydrates have been regarded as a promising alternative energy because of their vast reserves . How to safely and efficiently recover CH 4 from natural gas hydrates attracted extensive attention.…”