| 摘要_英文 |
To determine the solubility of CO2 in n-dodecane at T = 303.15-353.15 K, P <= 11.00 MPa, an integrated fused silica capillary and in-situ Raman spectroscopy system was built. The Raman peak intensity ratio (ICO2/IC-H)between the upper band of CO2 Fermi diad (ICO2) and the C-H stretching band of n-dodecane (IC-H) was employed to determine the solubility of CO2 in n-dodecane based on the calibrated correlation equation between the known CO2 molality in n-dodecane and the ICO2 /IC- H ratio with R2 = 0.9998. The results indicated that the solubility of CO2 decreased with increasing temperature and increased with increasing pressure. The maximum CO2 molality (30.7314 mol/kg) was obtained at 303.15 K and 7.00 MPa. Finally, a solubility prediction model (lnS = (P - A)/B) based on the relationship with temperature (T in K) and pressure (P in MPa) was developed, where S is CO2 molality, A = - 8 x 10-6 T2 thorn 0:0354T - 8:1605, and B = 0:0405T - 10:756. The results indicated that the solubilities of CO2 derived from this model were in good agreement with the experimental data.
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