INVESTIGADORES
QUINZANI Lidia Maria
artículos
Título:
High-pressure liquid-liquid equilibrium boundaries for systems containing polybutadiene and/or polyethylene and a light solvent or solvent mixture
Autor/es:
JUAN M. MILANESIO; GUILLERMO MABE; ANDRES CIOLINO; LIDIA MARÍA QUINZANI; MARCELO S. ZABALOY
Revista:
JOURNAL OF SUPERCRITICAL FLUIDS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Londres; Año: 2012 vol. 72 p. 333 - 339
ISSN:
0896-8446
Resumen:
In this work, we have obtained experimental cloud points,
i.e., liquidliquid equilibrium boundaries at constant composition, for the
systems polybutadiene (PB) + n-pentane (C5), PB + dimethyl ether (DME) +
C5, polyethylene (PE) + DME + C5, and PB + PE + DME + C5. The temperature
range of the experiments was from 50 to 184 ◦C. The maximum pressure was 303
bar. In all cases the overall polymer concentration was less than or equal to
4.1 wt%. At the ranges of conditions of the experiments we have found the following:
(a) For PB + C5, the minimum pressure required to guarantee homogeneity is 140
bar. (b) For PB + C5 + DME, the cloud point pressure (CPP) curves lie in
between the CPP curves of PB + DME and PB + C5, and the maximum CPP was 226
bar. The CPP increases with the increase of the DME/C5 ratio in the solvent
mixture. (c) For PE + DME + C5, there is a substantial decrease in the CPPs
with the addition of C5 to the DME + C5 solvent mixture, and the maximum CPP
was 303 bar. (d) The CPPs for PB + PE + DME + C5 are higher than the CPPs of
PB + DME + C5 but lower than the CPPs
of PE + DME + C5.