INVESTIGADORES
ZABALOY Marcelo Santiago
congresos y reuniones científicas
Título:
Measurement of cloud points for the systems polybutadiene + propane and polybutadiene + diethyl ether at high pressure
Autor/es:
J.M. MILANESIO; G.D.B. MABE; A.E. CIOLINO; L.M. QUINZANI; M.S. ZABALOY
Lugar:
Algarve. Praia da Rocha, Portugal
Reunión:
Conferencia; VIII IBEROAMERICAN CONFERENCE ON PHASE EQUILIBRIA AND FLUID PROPERTIES FOR PROCESS DESIGN – EQUIFASE 2009; 2009
Institución organizadora:
Laboratory of Separation and Reaction Engineering/ Laboratory of Catalysis and Materials – Faculdade de Engenharia da Universidade do Porto.
Resumen:
In the conventional hydrogenation of heavy compounds, like polymers, the immiscibility in the binary subsystem hydrogen–heavy substrate cannot be overcome by adding a solvent. On the other hand, by using a supercritical or quasicritical solvent, we can have the hydrogen and the polymer dissolved in a single phase. This implies higher mass transfer rates. To select the operating conditions of a supercritical reactor, it is convenient to determine the phase boundaries of the subsystems solvent-hydrogen and solvent-polymer [1]. In this work, we obtained experimental cloud points for binary systems made of polybutadiene (PB) and a solvent (propane or diethyl ether). The present results partially correspond to a phase equilibrium engineering study in which we determined the single-phase boundary for Solvent + PB systems. The final aim is to hydrogenate PBs using supercritical or quasicritical fluids as reaction media. A high pressure variable-volume phase-equilibrium cell has been designed and built. The cell has a glass window, a movable piston and a magnetic stirring system. We used this apparatus to measure cloud-point (liquid-liquid) pressures for the systems PB + propane and PB + diethyl ether (DEE). The temperature range was from 316 K to 457 K. The maximum pressure was 558 bar. The PBs used in this study have very narrow molecular weight distributions. The polymer number-averaged molecular weight was 14000 g/mol for the PB + propane experiments and 40000 g/mol for the PB-DEE data. The PBs were obtained using anionic polymerization techniques.