Understanding the thermodynamic phase equilibria for the allyl acetate, allyl acrylate and allyl methacrylate under CO2 as supercritical solvent

Abstract

Acrylic acid allyl ester groups show the non-ideal phase equilibria and have slightly or strong polarity. Phase equilibria for the allyl acetate, allyl acrylate and allyl methacrylate in conformity with chain-length play a crucial role as organic monomers in a number of chemical industries. The curves of the solution mixture for allyl acetate, allyl methacrylate, and allyl acrylate under high-pressure supercritical CO2 (super CO2) are examined with the help of a fabricated method at various temperatures within the boundary of (313.2 −393.2) K and pressures within (1.75–16.27) MPa. The three system for super CO2 + allyl acetate, super CO2 + allyl methacrylate and super CO2 + allyl acrylate solutions have critical mixed curves which show largest in p-T space between Tc (- critical temperatures) of super CO2 and allyl acetate or allyl acrylate or allyl methacrylate. The liquid + vapor data of super CO2 of three systems at a fixed pressure decreases with rise in temperature. The super CO2 + allyl acetate, super CO2 + allyl acrylate and super CO2 + allyl methacrylate systems display phase behavior of type-I. For the application at Peng-Robinson equation in theoretical investigation, solubility curves between the predicted and test results of the super CO2 + allyl acetate, super CO2 + allyl acrylate and super CO2 + allyl methacrylate binary systems were obtained the satisfactory agreement. The properties (pc, Tc and ω) and vapor pressure of allyl acetate, allyl acrylate and allyl methacrylate were estimated with group contribution and useful method.