Molecular dynamics simulations of the diffusion coefficients of light n-alkanes in water over a wide range of temperature and pressure Academic Article uri icon

abstract

  • © 2015 Elsevier B.V. The diffusion coefficients of the first five n-alkanes in water at infinite dilution have been obtained from molecular dynamics simulations over a wide range of temperatures at 0.1. MPa and additionally, for methane and n-butane, at higher pressures up to 200. MPa. Comparison with available experimental data provides confidence in the accuracy of the predictions using the TIP4P/2005 model for water and the TraPPE force field for n-alkanes. Additionally, a Speedy-Angell-type phenomenological equation that captures the pressure and temperature behavior of the methane and n-butane is provided which can be used for engineering calculations. Furthermore, it is shown that the diffusion coefficients of methane and n-butane obey the Stokes-Einstein equation. Finally, the molecular structure of water- n-alkane mixtures is examined.

author list (cited authors)

  • Michalis, V. K., Moultos, O. A., Tsimpanogiannis, I. N., & Economou, I. G.

citation count

  • 23

publication date

  • January 2016