Naslov
Liquid-liquid equilibrium calculations for polymer solutions using GC-Flory EOS

Autori
Bogdanić, Grozdana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
18th European Seminar on Applied Thermodynamics : Conference Book / Aim, Karel ; Ružička, Vlastimil - Kutna Hora : Institute of Chemical Technology, Prague, 2000, 51-51

Skup
18th European Seminar on Applied Thermodynamics, ESAT 2000

Mjesto i datum
Kutná Hora, Češka Republika, 08.06.2000. - 11.06.2000

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
liquid-liquid equilibium; equation of state; polymer solutions

Sažetak
During the last years, the GC-Flory EOS has been used to calculate activity coefficients in polymer-solvent mixture1,2,3. The GC-Flory EOS using parameters based on vapor-liquid equilibrium (VLE) was also applied to the prediction of the miscibility/immiscibility phenomena of monodisperse polymer-solvent systems4, but it was shown that the model was capable to predict only qualitatively the phase diagrams typical of LLE of polymer solutions. Instead, a group contribution lattice fluid equation of state5 gave better results. In principle, LLE compositions may be calculated using any model for Gibbs energy, but models relying on a group contribution approach, such as the UNIFAC model, but they require a special set of parameters6. In this work, the model parameters have been estimated from the experimental LLE data. The prediction of LLE phase behavior of polymer solutions with the new LLE parameter tables is significantly improved over the ones obtained using the VLE parameter tables. The comparison of the accuracy of the prediction was carried out, and it was shown that the model was capable quantitatively to predict the most relevant types of phase diagrams typical of LLE of polymer solutions (i.e. phase diagrams of the UCST, LCST, combined UCST and LCST, and "hourglass" types). _________________________________ 1.F.Chen, Aa.Fredenslund, P.Rasmussen, Ind.Eng.Chem.Res., 29, 875 (1990). 2.G.Bogdanić, Aa.Fredenslund, Ind.Eng.Chem.Res., 33, 1331 (1994). 3.G.Bogdanić, Aa.Fredenslund, Ind.Eng.Chem.Res., 34, 324 (1995). 4.A.Saraiva, G.Bogdanić, Aa.Fredenslund, Ind.Eng.Chem.Res., 34, 1835 (1995). 5.B.C.Lee, R.P.Danner, AIChE J. 42, 3223 (1996). 6.T.Magnussen, P.Rasmussen, Aa.Fredenslund, Ind.Eng.Chem.,Proc.Des.Dev., 20, 331 (1981).

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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