New Insights into the Kinetics and Morphology of CO₂ Hydrate Formation in the Presence of Sodium Dodecyl Sulfate

Abstract

This work reports an experimental investigation on the morphology and kinetics of CO2 hydrate formation in the presence of sodium dodecyl sulfate (SDS). The experiments were conducted at 277.15 K and 3.5 MPa, and the quantity of SDS varies from 0 to 3000 ppm. The “wall climbing” phenomenon of CO2 hydrate formation in the presence of SDS was observed, and the growth of CO2 hydrate above the gas–liquid interface was found to become stronger as the SDS concentration was increased from 300 to 3000 ppm. This indicates that the promoting effect of SDS on CO2 hydrate formation was enhanced with the increase of SDS concentration. The largest gas consumption for CO2 hydrate formation in SDS solutions was obtained at 1500 ppm of SDS among the four SDS concentrations tested in this work, which increased by 85% compared to that obtained in pure water under the same temperature and pressure conditions. When CO2 hydrate formation was conducted for a considerably long period, two rapid jumps in the gas consumption could be observed as the SDS concentration increased above 300 ppm, and the plateau between the two jumps was shortened with the increase of SDS concentration. As a result, a high efficiency for CO2 hydrate formation was obtained at 1500 and 3000 ppm of SDS. This will provide an implication to the improvement of the hydrate-based CO2 capture technology in the future.

Zeolitic ice: A route toward net zero emissions

“…In particular, the anionic surfactant sodium dodecyl sulfate (SDS) is predominant and has extensively been studied in different concentrations [109][110][111]. Close to its critical micelle concentration (CMC), SDS can relatively increase the hydrate formation rate significantly [112].…”

“…Close to its critical micelle concentration (CMC), SDS can relatively increase the hydrate formation rate significantly [112]. Micelles formation increases methane concentration in the aqueous phase and thus enables the nucleation to start earlier [111]. Here, it's worth mentioning that selection of the suitable surfactants should take into account their Krafft temperatures.…”

“…Simultaneously, environmental problems such as climate change start to affect the global economy and social stability. Consequently, the international legislation that emphasizes the importance of reducing carbon fingerprints is increasingly enforced worldwide [84,111]. Capturable CO 2 sources can be generally divided into two main groups (1) low concentration such as air [151] and (2) high concentration such as flue gases.…”

Minireview of Hydrate-Based CO2 Separation from a CO2/CH4 Gas Mixture: Progress and Outlook

“…There is a growing interest in CO 2 -containing systems driven by concerns arising from the need to mitigate global climate change. Thus, the interest to understand the processes relevant to the capture of CO 2 from flue gas and other gas mixtures is growing. − Because of the increasing global demand for natural gas, there is an increasing interest in unconventional resources such as shale gas, coalbed methane, and natural gas hydrates. CO 2 displacement has also been considered for the exploitation of unconventional natural gases. − It can enhance the recovery of natural gas and at the same time reduce CO 2 emissions by sequestering CO 2 underground.…”

Sulfonated Castor Oil as an Efficient Biosurfactant for Improving Methane Storage in Clathrate Hydrates

“…However, the rate of hydrate formation and the high degree of conversion of water to hydrate are critical technological parameters for hydrate-based technology . Thus, kinetic GHPs can be more effective because they increase the hydrate formation rate without affecting thermodynamics conditions, leaving the hydrate structure unchanged. , Anionic, cationic, and nonionic surfactants, ,, proteins, amino acids, − some ionic liquids, metal nanoparticles, − and such natural compounds as starches, cyclodextrin, and derivatives of celluloses are the most studied kinetic GHPs. These promoters particularly reduce the formation time of gas hydrates (nucleation time) and increase the growth rate of hydrate crystals. , …”