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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.
The phase diagrams of the systems of trimethylbromosilane and the isomeric lutidines are shown. The existence of the congruently melting addition compounds (CH3)3SiBr ∙ (3,4-lutidine), (CH3)3SiBr (3,5-lutidine) and the incongruently melting addition compounds (CH3)3SiBr • (2,3-lutidine)2, (CH3)3SiBr • (2,3-lutidine), (CH3)3SiBr (2,4-lutidine), ((CH3)3SiBr)2 • (2,4-lutidine), (CH3)3SiBr • (2,5-lutidine)2, (CH3)3SiBr • (2,5-lutidine), (CH3)3SiBr (2,6-lutidine)2 could be proved.