ie9b04623_si_001.pdf (140.38 kB)
Viscosities of 1‑Iodoalkanes. New Experimental Data, Prediction, and Analysis
journal contribution
posted on 2019-10-18, 19:45 authored by Olga S. Ryshkova, Eugene B. Postnikov, Ilya PolishukThis
study reports the atmospheric pressure viscosity data of liquid
1-iodopropane, 1-iodobutane, 1-iodopentane, 1-iodooctane, 1-iodononane,
1-iododecane, and 1-iodododecane along with relevant densities of
the last five homologues from 253.15 to 423.24 K. It is demonstrated
that the atmospheric pressure viscosities of 1-chloroalkanes and 1-iodoalkanes
are similar to the (n + 3) and (n + 6) n-alkanes, respectively. At the same time,
although the packing fractions of 1-chloroalkanes are most probably
similar to the pertinent n-alkanes, in the case of
1-iodoalkanes, such parallels seem to be questionable. Apparently,
the latter could explain a success of the entirely predictive modeling
framework coupling CP-PC-SAFT with modified Yarranton–Satyro
correlation (MYS) [Ind. Eng. Chem. Res. 2015, 54, 6999] in estimating the viscosities of 1-chloroalkanes
with the recommended values of critical constants and a desirability
of optimizing the experimentally unavailable Tc and Pc, in cases of 1-iodopropane
and further homologues. Besides that, the elevated pressure viscosities
of iodoethane exhibit a substantially weaker pressure dependence than
the equivalent data of n-octane, which is truthfully
predicted by CP-PC-SAFT + MYS. In addition, the residual entropy-based
approach of Novak [Int. J. Chem. React. Eng. 2011, 9, A107] predicts the viscosities of
both 1-chloroalkanes and 1-iodoalkanes in the less reliable manner
than CP-PC-SAFT + MYS. From the fragmental experimental data, an extent
of phase splits in the binary systems of 1-iodoalkanes is wider than
in the pertinent mixtures of (n + 6) n-alkanes, which is also predicted by CP-PC-SAFT in a reliable manner.