| 초록 |
Tetra-butyl ammonium chloride (TBAC) semiclathrate has vacant small cages which can be used for capturing small-sized gas molecules at atmospheric pressure conditions, while the large cages are occupied by TBAC cations. This research is focused on selective partitioning of CO2 in the flue gas mixtures for an application to CO2 capture process using TBAC semiclathrate formation. TBAC semiclathrate phase equilibria of 3.3 mol % which is a stoichiometric concentration of TBAC•29.7H2O were measured with CO2 (20, 40, 60, 80, and 100%) + N2 gas mixtures. CO2 composition was analyzed for measuring the gas consumption and the CO2 concentration in gas phases during the TBAC semiclathrate formation using gas chromatography. Enclathration of CO2 in the cages of TBAC semiclathrate was confirmed through Raman spectroscopy. Also, the CO2 concentration in the gas and hydrate phases were measured after completing the TBAC semiclathrate formation. The CO2 in flue gas mixtures was found to be enriched approximately 60 % in semiclathrate phase. The overall experimental results are helpful to understand the selective partitioning of CO2 by TBAC semiclahtrates formation. |
