High-pressure phase equilibrium data for the pseudo-binary systems propane + L-lactide at different ethanol to L-lactide molar ratios

J. P. BENDER, D. Z. FLORES, M. V. TRÊS, J. V. OLIVEIRA, S. R. S. FERREIRA
2015 Anais do XX Congresso Brasileiro de Engenharia Química   unpublished
The biopolymer poly(L,L-lactide) (PLLA) have received increased attention due to their potential application in the medicine and food industries. The PLLA have very promising properties -bioresorbable and biocompatible properties in the human body -and are easily synthesized from components available from renewable sources. This polymer can be manufactured by different polymerization routes, amoung which we highlight the enzyme-catalyzed ringopening polymerization of L,L-lactide in compressed
more » ... ide in compressed fluid. The aim of this work was to report the phase equilibrium data of the pressurized propane(1) + L,Llactide(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. While an increase in the ethanol to L,L-lactide molar ratio leads to a reduction in the pressure transition. In addition, a reduction in the concentration of ethanol in the system complicates the solubility of the system. Área temática: Engenharia das Separações e Termodinâmica
doi:10.5151/chemeng-cobeq2014-1503-18974-139823-fi fatcat:wbwpnq5ezje65h5pjvdbn36vpy