Effect of Hydrophobic Silica Nanoparticles on the Kinetics of Methane Hydrate Formation in Water-in-Oil Emulsions

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This study addresses the effect of hydrophobic silica nanoparticles (SiNPs) on methane hydrate formation in water-in-decane emulsions. Even though the new concept of hydrophobic particle inhibitors has been proposed in the flat interface of oil and bulk water phases, the mechanism of the particle inhibition has not been investigated for a hydrate-forming emulsion system. Numerous experiments with various amounts of SiNPs applied to water-in-decane emulsions and different temperature and pressure profiles have verified how the nanoparticles interact at the interface for hydrate inhibition or promotion. At lower concentrations of SiNPs, they act as a hydrate inhibitor. However, as the amount of SiNPs increases beyond a certain concentration (0.5 wt %), the formation rate anomalously increases because the oil film of the emulsions containing methane becomes thicker with the increasing amount of SiNPs, and water molecules form capillary bridges along the nanoparticle alignment. Our experimental results and suggested mechanisms provide insights into the interfacial behaviors of SiNPs for preventing hydrate formation in water-in-oil emulsions.
Publisher
AMER CHEMICAL SOC
Issue Date
2019-01
Language
English
Article Type
Article
Citation

ENERGY FUELS, v.33, no.1, pp.523 - 530

ISSN
0887-0624
DOI
10.1021/acs.energyfuels.8b03210
URI
http://hdl.handle.net/10203/250242
Appears in Collection
CBE-Journal Papers(저널논문)
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