Vapor-liquid equilibrium for binary systems of 2,3-pentanedione with diacetyl and acetone

2,3-Pentanedione and diacetyl are byproducts of sugar manufacture and have many food related uses. Vapor-liquid equilibrium (VLE) data for the systems presented in this paper are required to determine thermodynamic model parameters which will be used to simulate the design of a purification process. A vapor and liquid recirculating still was used to measure data for diacetyl + 2,3-pentanedione at 333.15 K, 343.15 K, 353.15 K, and 40 kPa, as well as for acetone + 2,3-pentanedione at 323.15 K, 30 kPa, and 40 kPa. The gamma-phi correlation approach for VLE modeling was used to correlate the data with excess Gibbs energy models. The vapor phase nonideality was computed using the truncated (two-term) virial equation of state. The Wilson, NRTL, and UNIQUAC excess Gibbs energy models were used to account for liquid phase departure from ideal behavior. The data are shown to be thermodynamically consistent by both the Van Ness point and direct tests.