High-pressure hydrogenation of polybutadiene at conditions found from phase transitions of the non-reactive system polybutadiene + n-pentane + dimethyl ether + hydrogen (T279)

MENOSSI, MATIÁS; MILANESIO, JUAN M.; CIOLINO, ANDRÉS; L. M. QUINZANI; ZABALOY, MARCELO S.

Nova Friburgo

Congreso; X Congresso Brasileiro de Termodinâmica Aplicada (CBTermo 2019); 2019

Universidade do Estado do Rio de Janeiro (UERJ)

In this work, loci of isochoric (constant global density) - isoplethic (constant global composition) phase equilibrium data were experimentally studied for the quaternary mixture: dimethyl ether (DME) + n-pentane (C5) + Polybutadiene (PB) + hydrogen (H2). The temperature and pressure ranges of the new non-reactive quaternary PvT data are from 297.0 to 444.6 K, and from 6.57 to 20.58 MPa, respectively. The mass of polymer, the overall density and the relative quantities of each light solvent were kept constant, but the amount of H2 was modified. The obtained experimental loci are curves in the pressure-temperature domain, of set global density and global composition. Such loci establish the relationship between temperature, pressure, global density and global composition for the mixture of interest. The curves obtained allowed to determine ranges of temperature and pressure to carry out the hydrogenation reactions.In this work, two constant-volume equilibrium cells were used, one with a window and the other without. The constant-volume windowed equilibrium cell allows identifying the phase condition at certain pressure and temperature values.From PvT data of non-reactive quaternary systems, hydrogenations at high pressure reactions were performed. Results on the degree of saturation of PB obtained in a constant volume reactor are presented in appropriate ranges of conditions. The maximum degree of hydrogenation measured was 98%. The hydrogenation reactions were carried out in a time of 6 hours with manual stirring and at varying the ratio between double bonds (C=C) and the amount of H2.