Vapor-liquid equilibria (VLE) in
alkanes and alcohols was measured and a
contribution Patel-Teja (GPT) equation
proposed in this work.
systems of nmodified
of state was
Isothermal vapor-liquid equilibria at temperatures
between 298.7K and 333. 7K have been measured for the
binary systems n-pentane + n-hexane. n-pentane + noctane.
n-pentane + n-decane. and n-pentane + l-propanol.
The data were found to be consistent according to a
point-to-point consistency test and were correlated using
the Wilson. NRTL. and UNIQUAC activity coefficient
models. The parameters of the models were estimated
using the maximum likelihood principle.
A new version of the Group contribution Patel-Teja
equation of state was proposed in which a new temperature
dependent group interaction expression was introduced.
Group interaction parameters for four constituent groups
of the alcohols and n-alkanes (viz. CH 2• CH 3 • CH and OH)
were determined. These parameters were then used for the
prediction of VLE in mixtures of n-alkane + n-alkane.
n-alkane + n-alcohol. and n-alcohol + n-alcohol.
VLE predictions with the new GPT equation of state
were found to be superior to predictions with the
original group contributions with molecular equations.
The modified equation can be used in systems of nalkanes
and alcohols where data for molecular parameters
are lacking. The proposed temperature dependence of the
group interaction parameters improved predictions over a
wide range of temperature and pressure.
A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.