1
Department of Chemical Engineering, Semnan University, Semnan, Iran
2
Department of Chemical Engineering, Amir-Kabir University of Technology, Tehran, Iran.
Abstract
Ternary phase diagrams for [polyethylene (Mw-420,000, Mw/Mn=2.6) / n-butane/ carbon dioxide], [polypropylene (Mw=290,000, Mw/Mn=1.32)/ n-pentane/carbon dioxide] and [polystyrene (Mw=187,000)/ cyclohexane/ carbon dioxide] have been generated using the Sanchez-Lacombe (SL) lattice-fluid model. The results show that at relatively low pressure, the ternary phase diagram has a L-L-V three-phase region bounded by two two-phase regions (L-V and L-L). At high pressure, L-L-V and L-V regions disappear and only the L-L region remains. With an increase of pressure this two-phase L-L region becomes smaller. This model can also predict transition LCST to UCST by increasing pressure. For polystyrene/ cyclohexane/ carbon dioxide mixture, the calculated results obtained using the SL-model are compared with the reported calculated results created by the perturbed hard-sphere chain model (PHSC) and the reported experimental data which indicate good agreement with both the calculated results by PHSC-model and experimental data.
Lotfollahi,M. N. , Daylam Salehi,R. and Modarress,H. (2006). Ternary phase diagram for polymer/ solvent/ supercritical-CO2by sanchez-lacombe model. Iranian Journal of Chemical Engineering (IJChE), 3(2), 64-72.
MLA
Lotfollahi,M. N. , , Daylam Salehi,R. , and Modarress,H. . "Ternary phase diagram for polymer/ solvent/ supercritical-CO2by sanchez-lacombe model", Iranian Journal of Chemical Engineering (IJChE), 3, 2, 2006, 64-72.
HARVARD
Lotfollahi M. N., Daylam Salehi R., Modarress H. (2006). 'Ternary phase diagram for polymer/ solvent/ supercritical-CO2by sanchez-lacombe model', Iranian Journal of Chemical Engineering (IJChE), 3(2), pp. 64-72.
CHICAGO
M. N. Lotfollahi, R. Daylam Salehi and H. Modarress, "Ternary phase diagram for polymer/ solvent/ supercritical-CO2by sanchez-lacombe model," Iranian Journal of Chemical Engineering (IJChE), 3 2 (2006): 64-72,
VANCOUVER
Lotfollahi M. N., Daylam Salehi R., Modarress H. Ternary phase diagram for polymer/ solvent/ supercritical-CO2by sanchez-lacombe model. IJChE, 2006; 3(2): 64-72.
