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- Methylchlorosilanes (2) (remove)
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A new evaluation of DSC-curves of binary mixtures is given. By analyzing the phase diagrams of methyltrichlorosilane and dimethyldichlorosilane with some lutidines the existence of the incongruently melting addition compounds MeSiCl3 · (2.3-Lutidine)-,, MeSiCl3 · 2.3-Lutidine, (MeSiCl3)2 · 3.4-Lutidine, Me,SiCl2 · (2.3-Lutidine)2, Me2SiCl2 · (2.5-Lutidine),, Me2SiCl2 · 2.5-Lutidine, Me2SiCl2 · (2.6-Lutidine)2, Me2SiCl2 · 2.6-Lutidine, Me2SiCl2 · (3.4-Lutidine)2, Me,SiCl2 · 3.4-Lutidine, (Me2SiCl2)2 · 3.4-Lutidine, Me2SiCl2 · (3.5-Lutidine)2, Me2SiCl2 · 3.5-Lutidine, and the congruently melting compound MeSiCl3 ·(3.4-Lutidine)2 was proven.
A thermodynamic interpretation of the liquidus curves of some methyltrichloro-respectively dimethyldichlorosilane/lutidine-systems is given. Based on certain approximations it was possible to fit thermodynamic functions to the experimental results to obtain the excess datas of binary systems. A comparison between the models of Redlich-Kister, Wilson and the NRTL-formalism for the free excess enthalpy of binary mixtures is given.