Crystal growth of ionic semiclathrate hydrate formed at interface between CO2+N2 gas mixture and tetrabutylammonium bromide aqueous solution

Hayama, Hiroaki; Akiba, Hotaka; Asami, Yuki; Ohmura, Ryo

doi:10.1007/s11814-016-0035-4

Cited by 5 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydrates first form in the liquid phase from the bottom edge of the reaction vessel; then, they are restricted at the gas–liquid interface without further formation, so there is no observation of the upward behavior of hydrate growth along the viewing window. The initial growth of the hydrate in the liquid phase instead at the gas/liquid interface has also been observed in previous studies. − This phenomenon may be caused by a decrease of the liquid’s surface tension with increasing THF concentration . Based on the in situ Raman spectra detection, it was found that the decrease of pressure during the hydrate formation resulted in no hydrate film in the gas/liquid interface.…”

Section: Results and Discussionsupporting

confidence: 73%

Morphology-Based Kinetic Study of the Formation of Carbon Dioxide Hydrates with Promoters

Liu

Cheng

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

Carbon dioxide (CO2) hydrate is a novel technology for CO2 capture and storage. To achieve more economical and efficient hydrate formation, we investigated the formation of CO2 hydrate with tetrahydrofuran (THF) and sodium dodecyl sulfate (SDS) by using CCD technology. A series of experiments were carried out to investigate the effects of mixed additives under moderate operating conditions, which can provide a safe, low-cost alternative for CO2 storage. Only two kinds of hydrate with flocculent-shaped and dendritic-shaped morphologies are observed, depending on the thermodynamic conditions of the system. The results show that the combination of 3.0 mol % THF + 500 ppm of SDS resulted in a shorter induction time and better CO2 consumption, with hydrate growth along the reactor wall, compared with 3.0 mol % THF alone, due to the possible synergy resulting from simultaneous use of these additives. However, this advantage is weakened with increasing THF concentration (5.56 mol % THF + 500 ppm of SDS), although higher concentrations of THF better expand the hydrate stabilization region.

show abstract

Section: Results and Discussionsupporting

confidence: 73%

Morphology-Based Kinetic Study of the Formation of Carbon Dioxide Hydrates with Promoters

Liu

Cheng

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The reason the methane hydrate crystals did not detach from the methane–water interface might be the high methane–water interfacial tension . The detachment of the hydrate crystals was also observed in systems with surfactants and tetra- n -butylammonium bromide (TBAB). − In these systems, the formed hydrate crystals detached from the interface and floated into the aqueous phase. The surfactants reduce the interfacial tension between the aqueous solution and guest and increase the wettability of the hydrate with the aqueous solution.…”

Section: Resultsmentioning

confidence: 99%

Crystal Growth of Clathrate Hydrate with Methane plus Partially Water Soluble Large-Molecule Guest Compound

Ozawa

Ohmura

2019

Crystal Growth & Design

Self Cite

View full text Add to dashboard Cite

This paper reports the visual observations of the formation and growth of clathrate hydrate formed with methane plus a partially water soluble guest, tetrahydropyran (THP). THP is known to form a structure II hydrate with methane. The crystal growth dynamics and crystal morphology changed depending on ΔT sub ≡ T eq – T ex, where T eq is the equilibrium temperature and T ex is the experimental temperature. At ΔT sub ≥ 12 K, the hydrate crystals initially formed at the water–THP interface and then grew to form a hydrate film. After the hydrate film was formed, the hydrate formation stopped. At ΔT sub < 12 K, the hydrate crystals that formed at the water–THP interface detached from the interface. The detachment of the hydrate crystals led to the maintenance of the interface and continual hydrate formation. These crystal growth dynamics may be ascribed to the reduced water–THP interfacial tension and the resulting enhancement of the wettability of hydrate with water in comparison with those in the system without THP.

show abstract

“…Akiba et al and Hayama et al reported a similar hydrate formation on the surface between CO 2 or CO 2 + N 2 and a droplet of TBAB solution, respectively (as shown in Figure ). , The growth of hydrate crystals inside the droplet was unique, because most hydrates grew at the surface of the droplet, which may be ascribed to the lower surface tension of the TBAB solution in comparison to that of pure water. The crystals that initially formed at the interface were wetted by the TBAB solution and fell into the solution.…”

Section: Morphology Of the Hydrate Crystalsmentioning

confidence: 99%

Review of Morphology Studies on Gas Hydrate Formation for Hydrate-Based Technology

Jiang

Liu

et al. 2020

Crystal Growth & Design

View full text Add to dashboard Cite

Over the past several decades, hydrate-based technology has been thought to have enormous application prospects in the energy and environmental fields. For the further development of hydrate-based technology, it is necessary to investigate the growth behaviors of hydrates and identify the factors that affect their morphology. A morphological study involves the observation of the characteristic appearance of the hydrate, including the shape, size, and mode of hydrate growth, which provides valuable information on the mechanism of hydrate formation, optimizes the industrial process with fast kinetics, and avoids geological hazards. On this basis, this paper reviews the morphology of gas hydrates from two scales, the macroscopic formation of gas hydrates and the crystal morphology of gas hydrates, for the further development of hydrate technology.

show abstract

Crystal growth of ionic semiclathrate hydrate formed at interface between CO2+N2 gas mixture and tetrabutylammonium bromide aqueous solution

Cited by 5 publications

References 34 publications

Morphology-Based Kinetic Study of the Formation of Carbon Dioxide Hydrates with Promoters

Morphology-Based Kinetic Study of the Formation of Carbon Dioxide Hydrates with Promoters

Crystal Growth of Clathrate Hydrate with Methane plus Partially Water Soluble Large-Molecule Guest Compound

Review of Morphology Studies on Gas Hydrate Formation for Hydrate-Based Technology

Contact Info

Product

Resources

About