Experimental study and modeling of the kinetics of carbon-dioxide hydrate formation and dissociation: A mass transfer limited kinetic approach

摘要

Kinetics of hydrate formation and dissociation of carbon dioxide studied through experiments carried out at isothermal-isobaric condition in a constant stirred tank reactor (CSTR). Experiments performed at different temperatures and pressure levels. Constant rates of CO2 mole consumption and mole production observed during hydrate formation and dissociation experiments. Accordingly, mass transfer limited hydrate kinetic models were used and mass transfer coefficients for CO2 hydrate formation and dissociation evaluated. It was found that mass transfer coefficients for CO2 hydrate dissociation are one order of magnitude larger than mass transfer coefficients for hydrate formation. The fact indicates that CO2 hydrate dissociation takes faster than formation. The evaluated mass transfer coefficient for CO2 hydrate formation and dissociation correlated as functions of temperature and pressure. The results can be applied for numerical modeling of underground storage of CO2 and simulation of hydrate based CO2 capture processes.