The phase diagrams of the liquid systems RnSi(OR’)4−n-Me2CO-H2O and RnSiCl4−n-Me2CO-H2O, where R = Me, Ph; R’ = Me, Et; n = 0–2, were compared. Mathematical modeling of the phase equilibrium in these systems was performed on the basis of the UNIFAC and NRTL equations. The heterogeneous regions, conodes of phase equilibrium, and compositions of the coexisting phases are determined. A satisfactory description of the experimental data by the parameters of the models of phase equilibrium obtained on the basis of the NRTL equations is shown for the phase diagrams of the MeSi(OEt)3/Si(OEt)4-Me2CO-H2O systems. The heterophase character due to the mutual insolubility of the monomers and water is common for both systems. The heterogeneous region of the RnSi(OR’)4−n-Me2CO-H2O system is smaller than that of RnSiCl4−n-Me2CO-H2O (calculation by the UNIFAC method). At the same acetone concentration, the water concentration in the organic phases of the “alkoxy” systems is higher than that in the “chlorosilane” systems. The replacement of acetone with ethanol and AcOH leads to a sharp reduction of the heterogeneous region.

中文翻译：

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有机氯硅烷/有机烷氧基硅烷-溶剂-水体系相图对比分析

RnSi(OR')4−n-Me2CO-H2O 和 RnSiCl4−n-Me2CO-H2O 液体体系的相图，其中 R = Me，Ph；R' = 我，Et; n = 0–2，进行了比较。这些系统中相平衡的数学建模是基于 UNIFAC 和 NRTL 方程进行的。确定了非均相区域、相平衡的锥体和共存相的组成。对于 MeSi(OEt)3/Si(OEt)4-Me2CO-H2O 系统的相图，通过基于 NRTL 方程获得的相平衡模型的参数对实验数据进行了令人满意的描述。由于单体和水互不溶解而导致的异相特性对于这两种体系是常见的。RnSi(OR')4-n-Me2CO-H2O 系统的异质区域比 RnSiCl4-n-Me2CO-H2O 小（通过 UNIFAC 方法计算）。在丙酮浓度相同的情况下，“烷氧基”体系有机相中的水浓度高于“氯硅烷”体系。用乙醇和 AcOH 代替丙酮导致异质区域急剧减少。