| 초록 |
In this study, post-combustion CO2 capture using QAS semiclathrate formation was investigated primarily focusing on thermodynamic stability conditions and spectroscopic analyses of the CO2 (20%) + N2 (80%) + QAS semiclathrates. Semiclathrate phase equilibria (H-Lw-V) of TBAB•26.0H2O, TBAC•29.7H2O, and TBAF•28.6H2O with flue gas mixtures were measured to determine stability conditions of each QAS semiclathrate. The gas consumption and CO2 concentration changes in the vapor phases during the semiclathrate formation was analyzed using gas chromatography. The enclathration of CO2 in the QAS semiclathrates was confirmed by Raman spectroscopy. In addition, dissociation enthalpies of each QAS semiclathrate were obtained using a high pressure micro-differential scanning calorimeter (HP μ-DSC). After completion of semiclathrate formation, the CO2 concentration in the semiclarhate phase was found to be approximately 60 % for all QAS semiclathrates. However, gas consumption during the semiclathrate formation was in the following order: TBAF ＜ TBAB ＜ TBAC. The overall experimental results obtained in this study are useful information for semiclathrate-based post-combustion CO2 capture. |
