Surfactant effects on hydrate formation in an unstirred gas/liquid system: Amendments to the previous study using HFC-32 and sodium dodecyl sulfate

Enhanced growth of methane–propane clathrate hydrate crystals with sodium dodecyl sulfate, sodium tetradecyl sulfate, and sodium hexadecyl sulfate surfactants

“…Link et al [12] concluded that Sodium Dodecyl Sulfate (SDS) is one of the best surfactants commercially available to be used for the enhancement of methane hydrate formation. Okutani et al [13] found that SDS enhances the rate of difluoromethane (HFC-32) hydrate formation and the water to hydrate conversion. Daimaru et al [14] carried out hydrate formation experiments in batch-mode and tested three surfactants with sodium sulfonic acid groups but with different carbon chain length (C4, C12, and C18).…”

Synthesis of anionic multichain type surfactant and its effect on methane gas hydrate formation

“…Various applications of gas hydrates have been proposed in the fields of energy and the environment. Research is also currently being conducted on the promotion of hydrate formation, as transporting natural gas in the form of solid hydrates may be more economical than current methods of transporting natural gas in liquid form (LNG; liquefied natural gas) [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Gudmundsson et al [3] demonstrated that methane hydrate could be stored at a temperature above À15 8C and at atmospheric pressure for a long time.…”

Impact of Fly Ash Impurity on the Hydrate-Based Gas Separation Process for Carbon Dioxide Capture from a Flue Gas Mixture

“…However, it was also found that the rate of hydrate formation for the ternary mixture (CO 2 , H 2 , and C 3 H 8 ) was lower than that of the binary mixture . Thus, the focus has shifted to a class of additives (surfactants) that can effectively promote the rate of hydrate formation − and thus improve the process economics by maximizing the water-to-hydrate conversion rate and ratio. It has been reported that, among the different classes of surfactants, anionic surfactants are the best for enhancing the rate of hydrate formation. − A few publications in the open literature deal with the simultaneous use of THF and sodium dodecyl sulfate (SDS). − It was reported that the simultaneous use of SDS and THF has a synergistic effect that enhances the storage capacity of CO 2 . , On the other hand, SDS was found to have no effect on the kinetics of hydrogen–THF mixed hydrates .…”

“…Thus, the focus has shifted to a class of additives (surfactants) that can effectively promote the rate of hydrate formation − and thus improve the process economics by maximizing the water-to-hydrate conversion rate and ratio. It has been reported that, among the different classes of surfactants, anionic surfactants are the best for enhancing the rate of hydrate formation. − A few publications in the open literature deal with the simultaneous use of THF and sodium dodecyl sulfate (SDS). − It was reported that the simultaneous use of SDS and THF has a synergistic effect that enhances the storage capacity of CO 2 . , On the other hand, SDS was found to have no effect on the kinetics of hydrogen–THF mixed hydrates . It was also noted that the addition of 1 mol % THF (among other THF concentrations) maximizes the separation factor by leaving most of the large cages for CO 2 occupancy in the resultant structure II hydrate. , The objective of this study was to evaluate the impact of fly ash on the thermodynamics and kinetics of hydrate formation and enhance the separation efficiency of the HBGS process in the presence of fly ash impurity in the flue gas stream.…”