Methane conversion rate into structure H hydrate crystals from ice

  1. Get@NRC: Methane conversion rate into structure H hydrate crystals from ice (Opens in a new window)
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Journal titleAIChE Journal
Pages24512460; # of pages: 10
AbstractThe methane uptake and conversion rate to structure H (sH) hydrates was measured and compared to crystallization kinetics models. Three large molecule guest substances (LMGS) were used as sH hydrate formers: neohexane (NH), methylcyclohexane (MCH), and tert-butyl methyl ether ( TBME). The initial crystallization occurred quickly at the LMGS liquid-ice interface until sim20-30% of ice was converted into hydrate (hydrate growth stage I). Slower hydrate crystal growth was observed after a hydrate film covered the ice surface at a rate of 3-400 nm2/h (hydrate growth stage II). The TBME system showed the fastest kinetics at the beginning of the reaction followed by NH and MCH system. However the trend changed when the temperature was increased (ldquoreactionrdquo stage III). Surprisingly, the conversion rate achieved with the TBME system upon melting the ice was the smallest. This was attributed to the strong interaction of TBME with water molecules that increased the energy barrier for water molecules to form hydrate cages. The conversion rates were well correlated with the Avrami equation and the shrinking core model. Finally, NH was found to be the best LMGS in this study to obtain full conversion within a short reaction time and achieving high methane gas storage in the hydrate.
Publication date
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12338274
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Record identifier66ac068c-263f-4dfc-8863-1f13fd4d83b9
Record created2009-09-10
Record modified2016-05-09
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