Abstract
Gas hydrates from CO 2 / N 2 and CO 2 / H 2 gas mixtures were formed in a semi-batch stirred vessel at constant pressure and temperature of 273.7 K. These mixtures are of interest to CO 2 separation and recovery from flue gas and fuel gas, respectively. During hydrate formation the gas uptake was determined and the composition changes in the gas phase were obtained by gas chromatography. The rate of hydrate growth from CO 2 / H 2 mixtures was found to be the fastest. In both mixtures CO 2 was found to be preferentially incorporated into the hydrate phase. The observed fractionation effect is desirable and provides the basis for CO 2 capture from flue gas or fuel gas mixtures. The separation from fuel gas is also a source of H 2 . The impact of tetrahydrofuran (THF) on hydrate formation from the CO 2 / N 2 mixture was also observed. THF is known to substantially reduce the equilibrium formation conditions enabling hydrate formation at much lower pressures. THF was found to reduce the induction time and the rate of hydrate growth.
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