Petroleum Science >2022,??lssue 6:??- DOI: https://doi.org/10.1016/j.petsci.2022.06.014
Integration of a fused silica capillary and in-situ Raman spectroscopy for investigating CO2 solubility in n-dodecane at near-critical and solubility?in?n-dodecane?at?near-critical?and?supercritical?conditions?of?CO2 Open?Access
文章信息
作者：Jun-Liang Wang, Zi-Hao Song, Lin-Jun Li, Li-Li Yang, Quan-Yuan Wang, I-Ming Chou, Zhi-Yan Pan
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引用方式：Jun-Liang Wang, Zi-Hao Song, Lin-Jun Li, Li-Li Yang, Quan-Yuan Wang, I-Ming Chou, Zhi-Yan Pan, Integration of a fused silica capillary and in-situ Raman spectroscopy for investigating CO2 solubility in n-dodecane at near-critical and supercritical conditions of CO2, Petroleum Science, Volume 19, Issue 6, 2022, Pages 3124-3133, https://doi.org/10.1016/j.petsci.2022.06.014.
文章摘要
Abstract: 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=?8×10?6T2+?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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Keywords: CO2 solubility; n-dodecane; Raman spectroscopy; Fused silica capillary; In-situ