Binary systems for the trimethylolpropane triacrylate and trimethylolpropane trimethacrylate in supercritical carbon Dioxide: Experiment and modeling

Abstract

The phase equilibrium data for two binary mixes of trimethylolpropane triacrylate (TMPTA) and trimethylolpropane trimethacrylate (TMPTMA) in supercritical CO2 are given. The mixture's experimental isotherms were determined at five different temperature windows, ranging from 313.2 K to 393.2 K, and maximum pressure of 32.23 MPa. The continuous critical mixture plot displayed by both binary mixtures indicates type-I behavior. At any temperature and composition, none of the systems under study exhibited three phases. The critical point for TMPTA + supercritical CO2 mixtures shifts to a higher pressure as temperature increases; however, no critical point was found for TMPTMA + supercritical CO2 mixture.Experimental phase behavior data is correlated with the Peng-Robinson two parameter cubic equation of state. Using two mixing parameters, all the isotherms in (P, x) space are predicted with satisfactory accuracy.