The clathrate hydrate process for post and pre-combustion capture of carbon dioxide

Capture of carbon dioxide from flue or fuel gas mixtures by clathrate crystallization in a silica gel column

“…The dry molar (%) gas compositions of the binary gas mixtures were determined by gas chromatography and are as follows: CO 2 (17.0)/N 2 (83.0) for the model flue gas and CO 2 (40.0)/H 2 (60%) for the model fuel gas mixture. Since N 2 and O 2 form hydrate at approximately the same pressure/temperature conditions, the above CO 2 /N 2 mixture is considered a suitable model flue gas (Kang and Lee, 2000;Linga et al, 2007a). THF was supplied by Fisher Scientific with 99% purity.…”

“…In addition, the separation factor (S.F.) is determined from the following equation (Linga et al, 2007a):…”

“…Capture of CO 2 from power plant flue gases from conventional power plants or from fuel gases from gasification plants is a technological application of gas hydrates under consideration (Aaron and Tsouris, 2005;Kang and Lee, 2000;Klara and Srivastava, 2002;Kumar et al, 2009;Linga et al, 2008Linga et al, , 2007aSeo et al, 2005). Post-combustion CO 2 capture involves separation of CO 2 from the flue gas mixture emitted from a power plant.…”

“…A typical pretreated flue gas contains 15-20 mol% CO 2 , 5-9% O 2 , and the rest N 2 . A process combining three hydrate crystallization stages and a membrane separation stage has been proposed for the capture of carbon dioxide from such mixtures (Linga et al, , 2007a. On the other hand pre-combustion capture involves separation of carbon dioxide from a carbon dioxide/hydrogen mixture (Herzog and Drake, 1996;Klara and Srivastava, 2002).…”

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

“…7 TBAF exhibits greater pressure reduction than TBAB. 8 According to literature 9 , the time to reach hydrate equilibrium with TBAF is about onehalf of that with TBAB and one-fourth of that with THF.…”