Thermal and Mutual Diffusivity of Binary Mixtures of n-Dodecane and n-Tetracontane with Carbon Monoxide, Hydrogen, and Water from Dynamic Light Scattering (DLS)

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• 作者：Andreas Heller ; Matthieu S. H. Fleys ; Jiaqi Chen ; Gerard P. van der Laan ; Michael H. Rausch ; Andreas P. Fröba
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：March 10, 2016
• 年：2016
• 卷：61
• 期：3
• 页码：1333-1340
• 全文大小：391K
• ISSN：1520-5134

文摘

The present work represents a continuation of a former study where the simultaneous determination of thermal and mutual diffusivity for binary mixtures of n-octacosane (n-C₂₈H₅₈) with dissolved carbon monoxide (CO), hydrogen (H₂), or water (H₂O) by using dynamic light scattering (DLS) was demonstrated. Here, the same properties are studied for binary mixtures of the n-alkanes n-dodecane (n-C₁₂H₂₆) or n-tetracontane (n-C₄₀H₈₂) with dissolved CO, H₂, or H₂O. In most cases, expanded relative uncertainties (k = 2) ranging from 2 to 12 % and 3 to 25 % for the thermal and mutual diffusivities could be obtained. The experimental mutual diffusivities for mixtures of n-C₁₂H₂₆ with CO, H₂, or H₂O measured at temperatures from 398 to 524 K and pressures from 0.2 to 4.2 MPa at saturation conditions agree well with molecular dynamics (MD) simulations using atomistic models and with experimental data from literature. Binary mixtures of n-C₄₀H₈₂ with dissolved CO, H₂, or H₂O were investigated in a temperature range from 447 to 498 K and pressures from 0.3 to 3.9 MPa. For mixtures with n-C₄₀H₈₂, the accessible temperature range was limited due to a change in the optical characteristics of the sample at elevated temperatures where DLS measurements suffered from absorption effects and particle scattering.