The biopolymer poly(L,L-lactide) (PLLA) have received increased attention due to their potential application in the medicine and food industries. This polymer can be manufactured by different polymerization routes, amoung which we highlight the enzyme-catalyzed ring-opening polymerization of L,L-lactide in compressed fluid. The aim of this work was to report the phase equilibrium data of the pressurized propane(1) + L,L-lactide(2) at two ethanol to monomer molar ratios (9:1 and 7:1). The phase equilibrium experiments were conducted in a high pressure variable-volume view cell employing the static synthetic method. The liquid-vapor equilibrium for the pseudo-binary systems was determined in the temperature range 323-353K and pressure up to 3.04MPa. For the systems investigated the liquid-vapor equilibrium (VLE) were visually recorded. It was observed that an increase in temperature or in propane concentration led to pronounced raise in transition pressure values.