Isobaric Vapor–Liquid Equilibrium for the Binary System of Decamethyltetrasiloxane and Dodecamethylpentasiloxane at 11.0, 50.0, and 101.3 kPa

The vapor–liquid equilibrium (VLE) data for decamethyltetrasiloxane (MD2M) and dodecamethylpentasiloxane (MD3M) are pivotal for efficient distillation separation process in the silicone industry. The isobaric VLE data for the binary system of MD2M + MD3M were determined at 11.0, 50.0, and 101.3 kPa using a modified Othmer still. The experimental data satisfied thermodynamic consistency tests, including Herington’s method and the Van Ness criterion. The VLE data were fitted using the NRTL, UNIQUAC, and Wilson activity coefficient models. The results show that the UNIQUAC model performs slightly better than the other models. The VLE data and model parameters reported here are essential for the design and simulation of separation processes for MD2M and MD3M, contributing valuable insights for industrial-scale operations.