Chemistry Reference
In-Depth Information
a
w
Fig. 13 Activity of water in aqueous solutions of NaPA 5 and NaCl.
Symbols
experimental data
[
28
];
dashed line
modeling of systems without salt;
dotted line
modeling of systems without
polyelectrolyte;
solid lines
correlation results
Fig. 14 Liquid liquid equilibrium of aqueous solutions of NaPA 5 and PEG 34.
Symbols
experi
mental equilibrium compositions [
115
];
dotted lines
experimental tie lines;
solid lines
correlation
results
called VERS model for polyelectrolytes (VERS-PE model). Like the model of
Pessoa and Maurer, the VERS model is based on Pitzer's equation [
105
] for the
Gibbs excess energy of aqueous solutions of low molecular weight, strong electro-
lytes. Großmann et al. introduced two modifications to allow for the treatment of
neutral polymers: the molality scale was replaced by a surface fraction scale, and
