In this study, the equilibrium conditions
for the dissociation
of carbon dioxide hydrate in the presence of various additives were
examined. To provide new experimental data and discuss the additive
effect of cyclic ketones and cyclic alcohols, the equilibrium dissociation
temperatures and pressures for carbon dioxide hydrates with the additive
of cyclopentanol, cyclohexnol, cycloheptanol, cyclohexanone, or cycloheptanone
were measured by an isochoric method. The experimental data were taken
at a pressure range of 1.7 to 3.5 MPa and a concentration of 5 wt
%. The Clausius–Clapeyron equation was used to speculate the
structure of carbon dioxide hydrate with these additives. It was found
that the additives of cyclohexanone and cycloheptanone had an inhibitory
effect on the formation of carbon dioxide hydrates with the sI structure.
Cycloheptanol had a slight inhibitory effect on the formation of carbon
dioxide hydrates at lower temperatures, but this effect disappeared
at higher temperatures, and this additive also belongs to the sI structure.
The addition of cyclopentanol and cyclohexnol additives showed a promotion
effect in a low-pressure region on the formation of carbon dioxide
hydrates, and the sII hydrate can be produced when adding these two
additives.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.