Why does CO2 hydrate disposed of in the ocean in the hydrate-formation region dissolve in seawater?

Morpholine-Induced Thermodynamic and Kinetic Inhibitions on Gas Hydrate Formation

“…In addition, adding more MPL to the aqueous phase up to the concentration of 35.0 wt % shifted the hydrate-phase equilibrium curve further to the inhibition region, as expected. To compare the thermodynamic inhibition effect of ILs on the three-phase equilibria of CH 4 4 ] also showed an inhibition effect with reduction of the dissociation temperature by 1.2−1.3 K at a given pressure. Although MPL is not as effective as the conventional THIs (inhibition of 3.5−5.0 and 2.0−2.5 K at a given pressure by methanol and ethylene glycol, respectively), 1 it should be noted that the inhibition effect is attributed to strong electrostatic charges and hydrogen bonding with water molecules by an inhibitor molecule.…”

“…17,18 The kinetic inhibition effects of inhibitors were evaluated in terms of induction time. MPL as well as a well-known KHI of PVP and an IL of [EMIM][BF 4 ] were selected as inhibitors for the CH 4 As shown in Figure 7, the average induction times with subcooling of 10. 4 ], which is known to have the best inhibition performance among imidazolium ILs at various concentrations.…”

“…MPL as well as a well-known KHI of PVP and an IL of [EMIM][BF 4 ] were selected as inhibitors for the CH 4 As shown in Figure 7, the average induction times with subcooling of 10. 4 ], which is known to have the best inhibition performance among imidazolium ILs at various concentrations. Furthermore, MPL showed improved kinetic inhibition effects, even compared to PVP at a concentration of 10.0 wt %.…”

Structural Transition and Tuning of tert‐Butylamine Hydrate

“…[3] It is clear that many of the physical attributes of gas hydrates remain unknown and thus need to be examined in more detail. The gas hydrates are of particular interest in the fields of energy research and environmental science because of the possible applications for the storage of natural gas, [4] sequestration of CO 2 in the deep ocean, [5] and separation of greenhouse gases from flue gas. [6] It is noteworthy that for lowering the pressure of hydrate formation without significant reduction of the capacity to store CH 4 , the use of sH hydrate was suggested.…”

Thermodynamic inhibition of 4-methylmorpholine while forming sH hydrate with methane

“…Because the molecules encaged in the cavities are unbound to the host framework, the guests are free to vibrate and rotate, but possess limited translational motion (Sum et al, 2009). Clathrate hydrates are of considerable interest to both science and engineering fields, particularly with respect to potential gas storage applications (Chatti et al, 2005;Struzhkin et al, 2007), a new source of natural gas (Makogon et al, 2007), and sequestration of CO 2 in the deep ocean (Teng et al, 1997). In general, the three most common structures, termed structures I, II and H, are known to exist for gas hydrates mainly depending on the molecular size of the accommodated guest species .…”