Dimerization and Viscosity of Acetic Acid Vapor
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Eckhard Vogel
Abstract
Results of new relative measurements on the vapor of acetic acid are reported. The measurements were based on a single calibration at room temperature with a theoretically calculated viscosity value of argon. Nineteen isochoric series, differing in density, were performed in an all-quartz oscillating-disk viscometer from 298 to 598 K and for densities between 0.5 and 61 mol m-3. The uncertainty of the experimental data is ±0.5% at low densities and ±(0.3−0.4)% at high densities increasing with temperature. This is inferior compared with measurements on simple gases due to adsorption effects on quartz at low temperatures and to thermal decomposition at high temperatures. Isotherms recalculated from the original isochoric data show with decreasing density a strong curvature with negative slope, particularly at low temperatures. The further evaluation accounts for the fact that a strong dimerization depending on temperature occurs in acetic acid vapor. The isotherms, resulting from an association model which considers additional interactions between monomers and dimers, show a smaller curvature in terms of the mole fraction of monomers. Viscosity values for monomers and dimers were deduced using a simplified equation for the viscosity of a gas mixture. These values are restricted to 570 K due to thermal decomposition and low mole fractions of the dimers at high temperature. Furthermore, viscosity values for the saturated vapor could be determined at low temperatures.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Preface. Prof. Dr. Andreas Heintz
- Effect of Water on the Densities and Viscosities of Some Ionic Liquids Containing a Phosphonium Cation
- The Influence of Water on the Solubility of Carbon Dioxide in Imidazolium Based Ionic Liquids
- Liquid Structure and Cluster Formation in Ionic Liquid/Water Mixtures – An Extensive ab initio Molecular Dynamics Study on 1-Ethyl-3-Methylimidazolium Acetate/Water Mixtures – Part
- Structure-Property Relations in Ionic Liquids: 1,2,3-Trimethyl-imidazolium and 1,2,3-Trimethyl-benzimidazolium bis-(trifluorsulfonyl)imide
- Heat Capacity, Excess Molar Volumes and Viscosity Deviation of Binary Systems of N-octylisoquinolinium bis{(trifluoromethyl)sulfonyl}imide Ionic Liquid
- High Partial Compression of 1-Butyl-3-Methylimidazolium Bis(trifluoromethylsulfonyl)imide Diluted in 2,6-Dimethylpyridine+Water Solvent
- A Study on the Influence of Na2SO4 on the Solubility of CO2 in Aqueous Solutions of (N,N-dimethylmethanamide)
- Prediction of Interfacial Tensions between Demixed Ternary Mixtures
- On the Influence of Molecular Structure on the Conductivity of Electrolyte Solutions – Sodium Chloride in Dioxane–Water Mixtures
- Thermodynamic Properties of Gaseous Argon from the Ab Initio Virial Equation of State
- Dimerization and Viscosity of Acetic Acid Vapor
- Second Osmotic Virial Coefficients and Aggregation of Monoclonal Antibodies by Static Laser Light Scattering
- Efficient Coding of the Minimum Image Convention
