Vapour–liquid equilibrium for the systems butane + methanol, +2-propanol, +1-butanol, +2-butanol, +2-methyl-2-propanol at 364.5 K

Isothermal vapour–liquid equilibrium measurements for the systems of butane with methanol, 2-propanol, 1-butanol, 2-butanol and 2-methyl-2-propanol were made at 364.5 K using a static total pressure apparatus. The obtained pressure–temperature–total composition (PTz) data were converted into pressure–temperature–liquid–vapour composition (PTxy) form by means of the Barker method. Error analysis was performed on measured and calculated variables. The systems of butane with methanol and 2-propanol showed azeotropic behaviour at 364.5 K. Wilson and NRTL parameters were regressed. The VLE measurements were compared with predictions obtained using the UNIFAC, UNIFAC-Dortmund and COSMO-RS models.