Abstract
Effects of cyclodextrins (CD) on hydrate formation kinetics were investigated. Several kinds of cyclodextrins, such as α-CD, β-CD, β-CD polymers, and β-CD modified with methyl and triacetyl groups were tested as additives for hydrate formation of xenon, with a concentration range of 0−5 wt %. Induction time for hydrate formation was reduced by the addition of any of the CDs; however, no clear relationship between the structure of CDs and the reduction effect was observed. The three-phase equilibrium pressure (H−V−Lw) was unaffected by the addition of the CDs, except for β-CDs modified with methyl or triacetyl groups. The hydrate formation rate, which was expressed as a rate constant based on the chemical potential, increased with the addition of α-CD, β-CD, and β-CD polymers. β-CD polymer showed the highest acceleration effect on the xenon hydrate at about 1 wt %; the rate constant was about three times larger than that for pure water. Contrastingly, modified β-CD and dextrin with a straight chain structu...
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