Validation of a new apparatus using the dynamic method for determining the critical properties of binary mixtures containing CO₂ and a n-alkane

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• 作者：Niramol Juntarachat ; Salma Bello ; Romain Privat ; Jean-Noë ; l Jaubert ; ^{jean-noel.jaubert@univ-lorraine.fr} ; ^{Jean-Noel.Jaubert@ensic.inpl-nancy.fr}
• 关键词：Experimental methods ; Critical point ; Critical opalescence ; Critical loci ; Dynamic method
• 刊名：Fluid Phase Equilibria
• 出版年：2012
• 期刊代码：32_03783812
• 类别：ce
• 出版时间：15 July, 2012
• 卷：325
• 期：Complete
• 页码：66-70
• 文件大小：611 K

摘要

In this paper the experimental setup of a new apparatus able to provide the critical properties of binary mixtures with known overall composition using a dynamic method is described. Critical temperatures (T_c) and critical pressures (P_c) of binary mixtures composed of carbon dioxide and n-alkanes (CO₂ + n-pentane, CO₂ + n-heptane and CO₂ + n-decane) are measured. The critical points are visually determined by observing the critical opalescence and the simultaneous disappearance and reappearance of the meniscus in the middle of the view cell which withstands operations up to 673 K and 20 MPa. The experimental critical data are compared with success to literature database and with their prediction from the PPR78 thermodynamic model.