Surfactant effects on SF6 hydrate formation.
Sulfur hexafluoride (SF(6)) has been widely used in a variety of industrial processes, but it is one of the most potent greenhouse gases. For this reason, it is necessary to separate or collect it from waste gas streams. One separation method is through hydrate crystal formation. In this study, SF(6) hydrate was formed in aqueous surfactant solutions of 0.00, 0.01, 0.05, 0.15 and 0.20 wt% to investigate the effects of surfactants on the hydrate formation rates. Three surfactants, Tween 20 (Tween), sodium dodecyl sulfate (SDS) and linear alkyl benzene sulfonate (LABS), were tested in a semi-batch stirred vessel at the constant temperature and pressures of 276.2 K and 0.78 MPa, respectively. All surfactants showed kinetic promoter behavior for SF(6) hydrate formation. It was also found that SF(6) hydrate formation proceeded in two stages with the second stage being the most rapid. In situ Raman spectroscopy analysis revealed that the increased gas consumption rate with the addition of surfactant was possibly due to the increased gas filling rate in the hydrate cavity.
Lee
Bo Ram
BR
School of Materials Science and Engineering, Pusan National University, Busan 609-735, Republic of Korea.
Lee
Ju Dong
JD
Lee
Hyun Ju
HJ
Ryu
Young Bok
YB
Lee
Man Sig
MS
Kim
Young Seok
YS
Englezos
Peter
P
Kim
Myung Hyun
MH
Kim
Yang Do
YD
D000393:Air Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D001557:Benzenesulfonates; D003460:Crystallization; D017752:Greenhouse Effect; D007700:Kinetics; D011136:Polysorbates; D012967:Sodium Dodecyl Sulfate; D013459:Sulfur Hexafluoride / Q000737:chemistry / Q000302:isolation & purification*; D013501:Surface-Active Agents / Q000737:chemistry*
D000393:Air Pollutants; D001557:Benzenesulfonates; D011136:Polysorbates; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate; C032365:benzenesulfonic acid; D013459:Sulfur Hexafluoride