N,N-dimetilasetamid-su-karbondioksit sisteminde dağılım katsayılarının ölçülmesi ve termodinamik modellemeleri

The partition coefficients of N,N-Dimethylacetamide (N,N-DMA) between the water and the supercritical carbon dioxide (scCO2) phases were measured in the temperature range of 298.15 K ? 318.15 K and the pressure range of 8.3 ? 24.1 MPa. The measurements were carried out in a 56 ml vessel by contacting the supercritical and the aqueous phases. The partition coefficients of N,N-DMA were found to increase from 0.05 to 0.150 with increasing pressure at a constant temperature and increase with temperature at a constant density.The bubble point pressures of N,N-DMA ? CO2 mixtures were measured at 298.15 K, 308.15 K and 318.15 K and were found to increase with increasing mole fraction of CO2. The partition coefficients were modeled using the Peng-Robinson Equation of State (PREOS) combined with modified van der Waals mixing rule ? The Panagiotopoulos and Reid mixing rule. The binary interaction parameters for the CO2 ? H2O pair were taken from the literature and were regressed for CO2 ? N,N-DMA and H2O ? N,N-DMA pairs by fitting partition coefficients data. The binary interaction parameter for CO2 ? N,N-DMA pair was found to depend linearly on temperature. The bubble point pressures of N,N-DMA and CO2 could be predicted fairly well using the regressed binary interaction parameters.