| 초록 |
In this work, effects of SO2 and NO as impurities on CO2 hydrate-forming conditions were experimentally determined in (aqueous liquid-hydrate-vapor) three-phase and (aqueous liquid-hydrate-vapor-guest-rich liquid) four-phase regions. Isobaric dissolution temperatures of formed hydrate were measured at temperature from 277 to 285 K and pressures from 2.0 to 4.5 MPa with mixed gases of SO2 or NO and CO2. The addition of SO2 to CO2 shifted incipient hydrate-forming conditions to lower temperatures. In three-phase region, the effect of the amount of water relative to mixed gas was studied to examine the effect of the overall composition on the hydrate-forming condition. As the relative amount of water increased at the same ratio of SO2 to CO2, the measured isobaric dissolution temperature decreased, indicating a decreased effect of SO2 on CO2 hydrate. Four-phase equilibrium data of CO2, SO2 and water mixtures showed a retrograde behavior on pT plane from the quadruple point of CO2 and water mixture to that of SO2 and water mixture. As NO contents in feed increased, the measured isobaric dissolution temperatures were found to decrease. However, the effect of NO was small when compared with that of SO2. |
