Squalene is applied in various fields of application. In contact with oxygen, it reacts to compounds with undesirable properties. Therefore, squalene often is hydrogenated to squalane, which is stable. Hydrogenation can advantageously be carried out with the additional application of supercritical carbon dioxide, which serves as a promoter for transporting hydrogen into the liquid phase and enhances equilibrium concentrations for squalane and squalene in the gaseous phase. In this paper, measurement and correlation of the relevant phase equilibrium data of the quaternary system are reported for search of optimized reaction conditions. In addition to literature data, VLE data are presented for the systems CO2−squalane, CO2−squalene, H2−squalane, CO2−H2−squalene, and CO2−H2−squalene−squalane, in the temperature and pressure ranges of (310 to 350) K and (150 to 350) bar. The quaternary system CO2−H2−squalene−squalane and all subsystems can be correlated with cubic equations of state. For this work, the program package PE, available from the Institute for Thermal and Separation Processes, Hamburg University of Technology, was used, applying the Soave−Redlich−Kwong equation of state (SRK-EOS) with the Mathias−Klotz−Prausnitz (MKP) mixing rule. On the basis of measurements and on literature data, it is possible to correlate the experimental data and predict phase behavior in the process relevant ranges.
Only the first three basic copper acetates of the following [Cu(CH3COO)2]2 · Cu(OH)2 · 5 H2O, Cu(CH3COO)2 · [Cu(OH)2]2, Cu(CH3COO)2 · [Cu(OH)2]3 · 2 H2O and Cu(CH3COO)2 · Cu(OH)2 · 5 H2O could be confirmed. Reproduceable directions are given. The compounds received have been characterized by powder diffraction and IR spectroscopy, the second one additionally by thermogravimetry and mass spectroscopy. A new basic copper acetate, Cu(CH3COO)2 · [Cu(OH)2]4 · 3 H2O, is described.
Six NiIV ions make up the coordination environment of each FeIV ion in the γ‐NiOOH‐like layer of the (electrochemically) oxidized form of the iron‐substituted nickel(II) hydroxide 1, as can be deduced from Mössbauer spectroscopic and electrochemical investigations. No NiIII ions are present in the redox‐active material. The direct two‐electron step NiII → NiIV + 2e− must be assumed.
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