Measurement and Modeling of the Densities for CO2 + Dodecane System from 313.55 K to 353.55 K and Pressures up to 18 MPa

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• 作者：Yi Zhang ; Zhaoyan Liu ; Weiguo Liu ; Jiafei Zhao ; Mingjun Yang ; Yu Liu ; Dayong Wang ; Yongchen Song
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：November 13, 2014
• 年：2014
• 卷：59
• 期：11
• 页码：3668-3676
• 全文大小：458K
• ISSN：1520-5134

文摘

Densities of binary mixtures of CO₂ and dodecane were measured by a magnetic suspension balance (MSB) at temperatures ranging from 313.55 K to 353.55 K under pressures from (8 to 18) MPa at five different CO₂ mole fractions: x₁ = 0, 0.2497, 0.5094, 0.7576, and 0.8610. Densities of the binary mixture increase with increasing pressure and decrease with increasing temperature. A crossover phenomenon is observed at high CO₂ concentrations, and the crossover pressure increases with increasing temperature. The experimental densities increase with the CO₂ mole fraction at first and then decrease at high CO₂ concentrations. The excess molar volumes are negative over the whole range of CO₂ concentrations and are more negative with increasing temperature and less negative with increasing pressure. The Benedict鈥揥ebb鈥揜ubin鈥揝tarling (BWRS) and the improved Perturbed Hard-Sphere Chain (PHSC) equations of state were used to calculate the densities of the CO₂鈥揹odecane mixtures. The improved PHSC model has fewer parameters and shows little loss of overall calculation accuracy compared to BWRS.